diff options
author | Patrick Georgi <pgeorgi@chromium.org> | 2015-06-22 19:41:29 +0200 |
---|---|---|
committer | Patrick Georgi <pgeorgi@google.com> | 2015-06-30 21:43:01 +0200 |
commit | 40a3e321d4e8f2877de1700db67b8c7f7ea89820 (patch) | |
tree | b8270b2ceb9e290d2e4e9a99868acb9cd335de6f /src/soc/nvidia/tegra210/dp.c | |
parent | 7f641e68f25c0b79960a97a6b265851c46298aae (diff) |
nvidia/tegra210: add new SoC
This includes Chrome OS downstream up to Change-Id: Ic89ed54c.
Change-Id: I81853434600390d643160fe57554495b2bfe60ab
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Reviewed-on: http://review.coreboot.org/10633
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Diffstat (limited to 'src/soc/nvidia/tegra210/dp.c')
-rw-r--r-- | src/soc/nvidia/tegra210/dp.c | 1663 |
1 files changed, 1663 insertions, 0 deletions
diff --git a/src/soc/nvidia/tegra210/dp.c b/src/soc/nvidia/tegra210/dp.c new file mode 100644 index 0000000000..ea6dbca74c --- /dev/null +++ b/src/soc/nvidia/tegra210/dp.c @@ -0,0 +1,1663 @@ +/* + * drivers/video/tegra/dc/dp.c + * + * Copyright (c) 2011-2015, NVIDIA Corporation. + * Copyright 2014 Google Inc. + * + * This software is licensed under the terms of the GNU General Public + * License version 2, as published by the Free Software Foundation, and + * may be copied, distributed, and modified under those terms. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + */ +#include <arch/io.h> +#include <console/console.h> +#include <device/device.h> +#include <device/i2c.h> +#include <edid.h> +#include <stdlib.h> +#include <string.h> +#include <delay.h> +#include <soc/addressmap.h> +#include <soc/clock.h> +#include <soc/display.h> +#include <soc/nvidia/tegra/i2c.h> +#include <soc/nvidia/tegra/dc.h> +#include <soc/nvidia/tegra/types.h> +#include <soc/nvidia/tegra/pwm.h> +#include <soc/nvidia/tegra/displayport.h> +#include <soc/sor.h> +#include "chip.h" + +#define DO_FAST_LINK_TRAINING 0 + +struct tegra_dc dc_data; + +enum { + DP_LT_SUCCESS = 0, + DP_LT_FAILED = -1, +}; + +struct tegra_dc_dp_data dp_data; + +static inline u32 tegra_dpaux_readl(struct tegra_dc_dp_data *dp, u32 reg) +{ + void *addr = dp->aux_base + (u32) (reg << 2); + u32 reg_val = READL(addr); + return reg_val; +} + +static inline void tegra_dpaux_writel(struct tegra_dc_dp_data *dp, + u32 reg, u32 val) +{ + void *addr = dp->aux_base + (u32) (reg << 2); + WRITEL(val, addr); +} + +static inline u32 tegra_dc_dpaux_poll_register(struct tegra_dc_dp_data *dp, + u32 reg, u32 mask, u32 exp_val, + u32 poll_interval_us, + u32 timeout_us) +{ + u32 reg_val = 0; + u32 temp = timeout_us; + + do { + udelay(poll_interval_us); + reg_val = tegra_dpaux_readl(dp, reg); + if (timeout_us > poll_interval_us) + timeout_us -= poll_interval_us; + else + break; + } while ((reg_val & mask) != exp_val); + + if ((reg_val & mask) == exp_val) + return 0; /* success */ + printk(BIOS_ERR, + "dpaux_poll_register 0x%x: timeout: " + "(reg_val)0x%08x & (mask)0x%08x != (exp_val)0x%08x\n", + reg, reg_val, mask, exp_val); + return temp; +} + +static inline int tegra_dpaux_wait_transaction(struct tegra_dc_dp_data *dp) +{ + /* According to DP spec, each aux transaction needs to finish + within 40ms. */ + if (tegra_dc_dpaux_poll_register(dp, DPAUX_DP_AUXCTL, + DPAUX_DP_AUXCTL_TRANSACTREQ_MASK, + DPAUX_DP_AUXCTL_TRANSACTREQ_DONE, + 100, DP_AUX_TIMEOUT_MS * 1000) != 0) { + printk(BIOS_INFO, "dp: DPAUX transaction timeout\n"); + return -1; + } + return 0; +} + +static int tegra_dc_dpaux_write_chunk(struct tegra_dc_dp_data *dp, u32 cmd, + u32 addr, u8 *data, u32 *size, + u32 *aux_stat) +{ + int i; + u32 reg_val; + u32 timeout_retries = DP_AUX_TIMEOUT_MAX_TRIES; + u32 defer_retries = DP_AUX_DEFER_MAX_TRIES; + u32 temp_data; + + if (*size > DP_AUX_MAX_BYTES) + return -1; /* only write one chunk of data */ + + /* Make sure the command is write command */ + switch (cmd) { + case DPAUX_DP_AUXCTL_CMD_I2CWR: + case DPAUX_DP_AUXCTL_CMD_MOTWR: + case DPAUX_DP_AUXCTL_CMD_AUXWR: + break; + default: + printk(BIOS_ERR, "dp: aux write cmd 0x%x is invalid\n", cmd); + return -1; + } + + tegra_dpaux_writel(dp, DPAUX_DP_AUXADDR, addr); + for (i = 0; i < DP_AUX_MAX_BYTES / 4; ++i) { + memcpy(&temp_data, data, 4); + tegra_dpaux_writel(dp, DPAUX_DP_AUXDATA_WRITE_W(i), temp_data); + data += 4; + } + + reg_val = tegra_dpaux_readl(dp, DPAUX_DP_AUXCTL); + reg_val &= ~DPAUX_DP_AUXCTL_CMD_MASK; + reg_val |= cmd; + reg_val &= ~DPAUX_DP_AUXCTL_CMDLEN_FIELD; + reg_val |= ((*size - 1) << DPAUX_DP_AUXCTL_CMDLEN_SHIFT); + + while ((timeout_retries > 0) && (defer_retries > 0)) { + if ((timeout_retries != DP_AUX_TIMEOUT_MAX_TRIES) || + (defer_retries != DP_AUX_DEFER_MAX_TRIES)) + udelay(1); + + reg_val |= DPAUX_DP_AUXCTL_TRANSACTREQ_PENDING; + tegra_dpaux_writel(dp, DPAUX_DP_AUXCTL, reg_val); + + if (tegra_dpaux_wait_transaction(dp)) + printk(BIOS_ERR, "dp: aux write transaction timeout\n"); + + *aux_stat = tegra_dpaux_readl(dp, DPAUX_DP_AUXSTAT); + + if ((*aux_stat & DPAUX_DP_AUXSTAT_TIMEOUT_ERROR_PENDING) || + (*aux_stat & DPAUX_DP_AUXSTAT_RX_ERROR_PENDING) || + (*aux_stat & DPAUX_DP_AUXSTAT_SINKSTAT_ERROR_PENDING) || + (*aux_stat & DPAUX_DP_AUXSTAT_NO_STOP_ERROR_PENDING)) { + if (timeout_retries-- > 0) { + printk(BIOS_INFO, "dp: aux write retry (0x%x)" + " -- %d\n", + *aux_stat, timeout_retries); + /* clear the error bits */ + tegra_dpaux_writel(dp, DPAUX_DP_AUXSTAT, + *aux_stat); + continue; + } else { + printk(BIOS_ERR, "dp: aux write got error" + " (0x%x)\n", *aux_stat); + return -1; + } + } + + if ((*aux_stat & DPAUX_DP_AUXSTAT_REPLYTYPE_I2CDEFER) || + (*aux_stat & DPAUX_DP_AUXSTAT_REPLYTYPE_DEFER)) { + if (defer_retries-- > 0) { + printk(BIOS_INFO, "dp: aux write defer (0x%x)" + " -- %d\n", *aux_stat, defer_retries); + /* clear the error bits */ + tegra_dpaux_writel(dp, DPAUX_DP_AUXSTAT, + *aux_stat); + continue; + } else { + printk(BIOS_ERR, "dp: aux write defer exceeds" + " max retries (0x%x)\n", *aux_stat); + return -1; + } + } + + if ((*aux_stat & DPAUX_DP_AUXSTAT_REPLYTYPE_MASK) == + DPAUX_DP_AUXSTAT_REPLYTYPE_ACK) { + *size = ((*aux_stat) & DPAUX_DP_AUXSTAT_REPLY_M_MASK); + return 0; + } else { + printk(BIOS_ERR, "dp: aux write failed (0x%x)\n", + *aux_stat); + return -1; + } + } + /* Should never come to here */ + return -1; +} + +static int tegra_dc_dpaux_read_chunk(struct tegra_dc_dp_data *dp, u32 cmd, + u32 addr, u8 *data, u32 *size, + u32 *aux_stat) +{ + u32 reg_val; + u32 timeout_retries = DP_AUX_TIMEOUT_MAX_TRIES; + u32 defer_retries = DP_AUX_DEFER_MAX_TRIES; + + if (*size > DP_AUX_MAX_BYTES) + return -1; /* only read one chunk */ + + /* Check to make sure the command is read command */ + switch (cmd) { + case DPAUX_DP_AUXCTL_CMD_I2CRD: + case DPAUX_DP_AUXCTL_CMD_I2CREQWSTAT: + case DPAUX_DP_AUXCTL_CMD_MOTRD: + case DPAUX_DP_AUXCTL_CMD_AUXRD: + break; + default: + printk(BIOS_ERR, "dp: aux read cmd 0x%x is invalid\n", cmd); + return -1; + } + + *aux_stat = tegra_dpaux_readl(dp, DPAUX_DP_AUXSTAT); + if (!(*aux_stat & DPAUX_DP_AUXSTAT_HPD_STATUS_PLUGGED)) { + printk(BIOS_SPEW, "dp: HPD is not detected\n"); + return -1; + } + + tegra_dpaux_writel(dp, DPAUX_DP_AUXADDR, addr); + + reg_val = tegra_dpaux_readl(dp, DPAUX_DP_AUXCTL); + reg_val &= ~DPAUX_DP_AUXCTL_CMD_MASK; + reg_val |= cmd; + reg_val &= ~DPAUX_DP_AUXCTL_CMDLEN_FIELD; + reg_val |= ((*size - 1) << DPAUX_DP_AUXCTL_CMDLEN_SHIFT); + while ((timeout_retries > 0) && (defer_retries > 0)) { + if ((timeout_retries != DP_AUX_TIMEOUT_MAX_TRIES) || + (defer_retries != DP_AUX_DEFER_MAX_TRIES)) + udelay(DP_DPCP_RETRY_SLEEP_NS * 2); + + reg_val |= DPAUX_DP_AUXCTL_TRANSACTREQ_PENDING; + tegra_dpaux_writel(dp, DPAUX_DP_AUXCTL, reg_val); + + if (tegra_dpaux_wait_transaction(dp)) + printk(BIOS_INFO, "dp: aux read transaction timeout\n"); + + *aux_stat = tegra_dpaux_readl(dp, DPAUX_DP_AUXSTAT); + + if ((*aux_stat & DPAUX_DP_AUXSTAT_TIMEOUT_ERROR_PENDING) || + (*aux_stat & DPAUX_DP_AUXSTAT_RX_ERROR_PENDING) || + (*aux_stat & DPAUX_DP_AUXSTAT_SINKSTAT_ERROR_PENDING) || + (*aux_stat & DPAUX_DP_AUXSTAT_NO_STOP_ERROR_PENDING)) { + if (timeout_retries-- > 0) { + printk(BIOS_INFO, "dp: aux read retry (0x%x)" + " -- %d\n", *aux_stat, + timeout_retries); + /* clear the error bits */ + tegra_dpaux_writel(dp, DPAUX_DP_AUXSTAT, + *aux_stat); + continue; /* retry */ + } else { + printk(BIOS_ERR, "dp: aux read got error" + " (0x%x)\n", *aux_stat); + return -1; + } + } + + if ((*aux_stat & DPAUX_DP_AUXSTAT_REPLYTYPE_I2CDEFER) || + (*aux_stat & DPAUX_DP_AUXSTAT_REPLYTYPE_DEFER)) { + if (defer_retries-- > 0) { + printk(BIOS_INFO, "dp: aux read defer (0x%x)" + " -- %d\n", *aux_stat, defer_retries); + /* clear the error bits */ + tegra_dpaux_writel(dp, DPAUX_DP_AUXSTAT, + *aux_stat); + continue; + } else { + printk(BIOS_INFO, "dp: aux read defer exceeds" + " max retries (0x%x)\n", *aux_stat); + return -1; + } + } + + if ((*aux_stat & DPAUX_DP_AUXSTAT_REPLYTYPE_MASK) == + DPAUX_DP_AUXSTAT_REPLYTYPE_ACK) { + int i; + u32 temp_data[4]; + + for (i = 0; i < DP_AUX_MAX_BYTES / 4; ++i) + temp_data[i] = tegra_dpaux_readl(dp, + DPAUX_DP_AUXDATA_READ_W(i)); + + *size = ((*aux_stat) & DPAUX_DP_AUXSTAT_REPLY_M_MASK); + memcpy(data, temp_data, *size); + + return 0; + } else { + printk(BIOS_ERR, "dp: aux read failed (0x%x\n", + *aux_stat); + return -1; + } + } + /* Should never come to here */ + printk(BIOS_ERR, "%s: can't\n", __func__); + return -1; +} + +#if DO_FAST_LINK_TRAINING +static int tegra_dc_dpaux_read(struct tegra_dc_dp_data *dp, u32 cmd, u32 addr, + u8 *data, u32 *size, u32 *aux_stat) +{ + u32 finished = 0; + u32 cur_size; + int ret = 0; + + do { + cur_size = *size - finished; + if (cur_size > DP_AUX_MAX_BYTES) + cur_size = DP_AUX_MAX_BYTES; + + ret = tegra_dc_dpaux_read_chunk(dp, cmd, addr, + data, &cur_size, aux_stat); + if (ret) + break; + + /* cur_size should be the real size returned */ + addr += cur_size; + data += cur_size; + finished += cur_size; + + } while (*size > finished); + + *size = finished; + return ret; +} +#endif /* DO_FAST_LINK_TRAINING */ + +static int tegra_dc_dp_dpcd_read(struct tegra_dc_dp_data *dp, u32 cmd, + u8 *data_ptr) +{ + u32 size = 1; + u32 status = 0; + int ret; + + ret = tegra_dc_dpaux_read_chunk(dp, DPAUX_DP_AUXCTL_CMD_AUXRD, + cmd, data_ptr, &size, &status); + if (ret) + printk(BIOS_ERR, + "dp: Failed to read DPCD data. CMD 0x%x, Status 0x%x\n", + cmd, status); + + return ret; +} + +static int tegra_dc_dp_dpcd_write(struct tegra_dc_dp_data *dp, u32 cmd, + u8 data) +{ + u32 size = 1; + u32 status = 0; + int ret; + + ret = tegra_dc_dpaux_write_chunk(dp, DPAUX_DP_AUXCTL_CMD_AUXWR, + cmd, &data, &size, &status); + if (ret) + printk(BIOS_ERR, + "dp: Failed to write DPCD data. CMD 0x%x, Status 0x%x\n", + cmd, status); + return ret; +} + +static int tegra_dc_i2c_aux_read(struct tegra_dc_dp_data *dp, u32 i2c_addr, + u8 addr, u8 *data, u32 *size, u32 *aux_stat) +{ + u32 finished = 0; + int ret = 0; + + do { + u32 cur_size = MIN(DP_AUX_MAX_BYTES, *size - finished); + + u32 len = 1; + ret = tegra_dc_dpaux_write_chunk( + dp, DPAUX_DP_AUXCTL_CMD_MOTWR, i2c_addr, + &addr, &len, aux_stat); + if (ret) { + printk(BIOS_ERR, "%s: error sending address to read.\n", + __func__); + break; + } + + ret = tegra_dc_dpaux_read_chunk( + dp, DPAUX_DP_AUXCTL_CMD_I2CRD, i2c_addr, + data, &cur_size, aux_stat); + if (ret) { + printk(BIOS_ERR, "%s: error reading data.\n", __func__); + break; + } + + /* cur_size should be the real size returned */ + addr += cur_size; + data += cur_size; + finished += cur_size; + } while (*size > finished); + + *size = finished; + return ret; +} + +static void tegra_dc_dpaux_enable(struct tegra_dc_dp_data *dp) +{ + /* clear interrupt */ + tegra_dpaux_writel(dp, DPAUX_INTR_AUX, 0xffffffff); + /* do not enable interrupt for now. Enable them when Isr in place */ + tegra_dpaux_writel(dp, DPAUX_INTR_EN_AUX, 0x0); + + tegra_dpaux_writel(dp, DPAUX_HYBRID_PADCTL, + DPAUX_HYBRID_PADCTL_AUX_DRVZ_OHM_50 | + DPAUX_HYBRID_PADCTL_AUX_CMH_V0_70 | + 0x18 << DPAUX_HYBRID_PADCTL_AUX_DRVI_SHIFT | + DPAUX_HYBRID_PADCTL_AUX_INPUT_RCV_ENABLE); + + tegra_dpaux_writel(dp, DPAUX_HYBRID_SPARE, + DPAUX_HYBRID_SPARE_PAD_PWR_POWERUP); +} + +static void tegra_dc_dp_dump_link_cfg(struct tegra_dc_dp_data *dp, + const struct tegra_dc_dp_link_config *link_cfg) +{ + printk(BIOS_INFO, "DP config: cfg_name " + "cfg_value\n"); + printk(BIOS_INFO, " Lane Count %d\n", + link_cfg->max_lane_count); + printk(BIOS_INFO, " SupportEnhancedFraming %s\n", + link_cfg->support_enhanced_framing ? "Y" : "N"); + printk(BIOS_INFO, " Bandwidth %d\n", + link_cfg->max_link_bw); + printk(BIOS_INFO, " bpp %d\n", + link_cfg->bits_per_pixel); + printk(BIOS_INFO, " EnhancedFraming %s\n", + link_cfg->enhanced_framing ? "Y" : "N"); + printk(BIOS_INFO, " Scramble_enabled %s\n", + link_cfg->scramble_ena ? "Y" : "N"); + printk(BIOS_INFO, " LinkBW %d\n", + link_cfg->link_bw); + printk(BIOS_INFO, " lane_count %d\n", + link_cfg->lane_count); + printk(BIOS_INFO, " activespolarity %d\n", + link_cfg->activepolarity); + printk(BIOS_INFO, " active_count %d\n", + link_cfg->active_count); + printk(BIOS_INFO, " tu_size %d\n", + link_cfg->tu_size); + printk(BIOS_INFO, " active_frac %d\n", + link_cfg->active_frac); + printk(BIOS_INFO, " watermark %d\n", + link_cfg->watermark); + printk(BIOS_INFO, " hblank_sym %d\n", + link_cfg->hblank_sym); + printk(BIOS_INFO, " vblank_sym %d\n", + link_cfg->vblank_sym); +} + +static int _tegra_dp_lower_link_config(struct tegra_dc_dp_data *dp, + struct tegra_dc_dp_link_config *link_cfg) +{ + + switch (link_cfg->link_bw) { + case SOR_LINK_SPEED_G1_62: + if (link_cfg->max_link_bw > SOR_LINK_SPEED_G1_62) + link_cfg->link_bw = SOR_LINK_SPEED_G2_7; + link_cfg->lane_count /= 2; + break; + case SOR_LINK_SPEED_G2_7: + link_cfg->link_bw = SOR_LINK_SPEED_G1_62; + break; + case SOR_LINK_SPEED_G5_4: + if (link_cfg->lane_count == 1) { + link_cfg->link_bw = SOR_LINK_SPEED_G2_7; + link_cfg->lane_count = link_cfg->max_lane_count; + } else + link_cfg->lane_count /= 2; + break; + default: + printk(BIOS_ERR, "dp: Error link rate %d\n", link_cfg->link_bw); + return DP_LT_FAILED; + } + + return (link_cfg->lane_count > 0) ? DP_LT_SUCCESS : DP_LT_FAILED; +} + +/* Calcuate if given cfg can meet the mode request. */ +/* Return true if mode is possible, false otherwise. */ +static int tegra_dc_dp_calc_config(struct tegra_dc_dp_data *dp, + const struct soc_nvidia_tegra210_config *config, + struct tegra_dc_dp_link_config *link_cfg) +{ + const u32 link_rate = 27 * link_cfg->link_bw * 1000 * 1000; + const u64 f = 100000; /* precision factor */ + + u32 num_linkclk_line; /* Number of link clocks per line */ + u64 ratio_f; /* Ratio of incoming to outgoing data rate */ + + u64 frac_f; + u64 activesym_f; /* Activesym per TU */ + u64 activecount_f; + u32 activecount; + u32 activepolarity; + u64 approx_value_f; + u32 activefrac = 0; + u64 accumulated_error_f = 0; + u32 lowest_neg_activecount = 0; + u32 lowest_neg_activepolarity = 0; + u32 lowest_neg_tusize = 64; + u32 num_symbols_per_line; + u64 lowest_neg_activefrac = 0; + u64 lowest_neg_error_f = 64 * f; + u64 watermark_f; + + int i; + int neg; + + printk(BIOS_INFO, "dp: %s\n", __func__); + + if (!link_rate || !link_cfg->lane_count || !config->pixel_clock || + !link_cfg->bits_per_pixel) + return -1; + + if ((u64)config->pixel_clock * link_cfg->bits_per_pixel >= + (u64)link_rate * 8 * link_cfg->lane_count) + return -1; + + num_linkclk_line = (u32)((u64)link_rate * (u64)config->xres / + config->pixel_clock); + + ratio_f = (u64)config->pixel_clock * link_cfg->bits_per_pixel * f; + ratio_f /= 8; + ratio_f = (u64)(ratio_f / (link_rate * link_cfg->lane_count)); + + for (i = 64; i >= 32; --i) { + activesym_f = ratio_f * i; + activecount_f = (u64)(activesym_f / (u32)f) * f; + frac_f = activesym_f - activecount_f; + activecount = (u32)((u64)(activecount_f / (u32)f)); + + if (frac_f < (f / 2)) /* fraction < 0.5 */ + activepolarity = 0; + else { + activepolarity = 1; + frac_f = f - frac_f; + } + + if (frac_f != 0) { + frac_f = (u64)((f * f) / frac_f); /* 1/fraction */ + if (frac_f > (15 * f)) + activefrac = activepolarity ? 1 : 15; + else + activefrac = activepolarity ? + (u32)((u64)(frac_f / (u32)f)) + 1 : + (u32)((u64)(frac_f / (u32)f)); + } + + if (activefrac == 1) + activepolarity = 0; + + if (activepolarity == 1) + approx_value_f = activefrac ? (u64)( + (activecount_f + (activefrac * f - f) * f) / + (activefrac * f)) : + activecount_f + f; + else + approx_value_f = activefrac ? + activecount_f + (u64)(f / activefrac) : + activecount_f; + + if (activesym_f < approx_value_f) { + accumulated_error_f = num_linkclk_line * + (u64)((approx_value_f - activesym_f) / i); + neg = 1; + } else { + accumulated_error_f = num_linkclk_line * + (u64)((activesym_f - approx_value_f) / i); + neg = 0; + } + + if ((neg && (lowest_neg_error_f > accumulated_error_f)) || + (accumulated_error_f == 0)) { + lowest_neg_error_f = accumulated_error_f; + lowest_neg_tusize = i; + lowest_neg_activecount = activecount; + lowest_neg_activepolarity = activepolarity; + lowest_neg_activefrac = activefrac; + + if (accumulated_error_f == 0) + break; + } + } + + if (lowest_neg_activefrac == 0) { + link_cfg->activepolarity = 0; + link_cfg->active_count = lowest_neg_activepolarity ? + lowest_neg_activecount : lowest_neg_activecount - 1; + link_cfg->tu_size = lowest_neg_tusize; + link_cfg->active_frac = 1; + } else { + link_cfg->activepolarity = lowest_neg_activepolarity; + link_cfg->active_count = (u32)lowest_neg_activecount; + link_cfg->tu_size = lowest_neg_tusize; + link_cfg->active_frac = (u32)lowest_neg_activefrac; + } + + watermark_f = (u64)((ratio_f * link_cfg->tu_size * (f - ratio_f)) / f); + link_cfg->watermark = (u32)((u64)((watermark_f + lowest_neg_error_f) / + f)) + link_cfg->bits_per_pixel / 4 - 1; + num_symbols_per_line = (config->xres * link_cfg->bits_per_pixel) / + (8 * link_cfg->lane_count); + + if (link_cfg->watermark > 30) { + printk(BIOS_INFO, + "dp: sor setting: unable to get a good tusize, " + "force watermark to 30.\n"); + link_cfg->watermark = 30; + return -1; + } else if (link_cfg->watermark > num_symbols_per_line) { + printk(BIOS_INFO, + "dp: sor setting: force watermark to the number " + "of symbols in the line.\n"); + link_cfg->watermark = num_symbols_per_line; + return -1; + } + + /* Refer to dev_disp.ref for more information. */ + /* # symbols/hblank = ((SetRasterBlankEnd.X + SetRasterSize.Width - */ + /* SetRasterBlankStart.X - 7) * link_clk / pclk) */ + /* - 3 * enhanced_framing - Y */ + /* where Y = (# lanes == 4) 3 : (# lanes == 2) ? 6 : 12 */ + link_cfg->hblank_sym = (int)((u64)(((u64)(config->hback_porch + + config->hfront_porch + config->hsync_width - 7) * + link_rate) / config->pixel_clock)) - + 3 * link_cfg->enhanced_framing - + (12 / link_cfg->lane_count); + + if (link_cfg->hblank_sym < 0) + link_cfg->hblank_sym = 0; + + + /* Refer to dev_disp.ref for more information. */ + /* # symbols/vblank = ((SetRasterBlankStart.X - */ + /* SetRasterBlankEen.X - 25) * link_clk / pclk) */ + /* - Y - 1; */ + /* where Y = (# lanes == 4) 12 : (# lanes == 2) ? 21 : 39 */ + link_cfg->vblank_sym = (int)((u64)((u64)(config->xres - 25) + * link_rate / config->pixel_clock)) - (36 / + link_cfg->lane_count) - 4; + + if (link_cfg->vblank_sym < 0) + link_cfg->vblank_sym = 0; + + link_cfg->is_valid = 1; + tegra_dc_dp_dump_link_cfg(dp, link_cfg); + + return 0; +} + +static int tegra_dc_dp_init_max_link_cfg( + struct soc_nvidia_tegra210_config *config, + struct tegra_dc_dp_data *dp, + struct tegra_dc_dp_link_config *link_cfg) +{ + u8 dpcd_data; + int ret; + + printk(BIOS_INFO, "dp: %s\n", __func__); + + CHECK_RET(tegra_dc_dp_dpcd_read(dp, NV_DPCD_MAX_LANE_COUNT, + &dpcd_data)); + link_cfg->max_lane_count = dpcd_data & NV_DPCD_MAX_LANE_COUNT_MASK; + link_cfg->tps3_supported = (dpcd_data & + NV_DPCD_MAX_LANE_COUNT_TPS3_SUPPORTED_YES) ? 1 : 0; + + link_cfg->support_enhanced_framing = + (dpcd_data & NV_DPCD_MAX_LANE_COUNT_ENHANCED_FRAMING_YES) ? + 1 : 0; + + CHECK_RET(tegra_dc_dp_dpcd_read(dp, NV_DPCD_MAX_DOWNSPREAD, + &dpcd_data)); + link_cfg->downspread = (dpcd_data & NV_DPCD_MAX_DOWNSPREAD_VAL_0_5_PCT) + ? 1 : 0; + + CHECK_RET(tegra_dc_dp_dpcd_read(dp, NV_DPCD_TRAINING_AUX_RD_INTERVAL, + &link_cfg->aux_rd_interval)); + + CHECK_RET(tegra_dc_dp_dpcd_read(dp, NV_DPCD_MAX_LINK_BANDWIDTH, + &link_cfg->max_link_bw)); + + link_cfg->bits_per_pixel = config->panel_bits_per_pixel; + + /* + * Set to a high value for link training and attach. + * Will be re-programmed when dp is enabled. + */ + link_cfg->drive_current = config->dp.drive_current; + link_cfg->preemphasis = config->dp.preemphasis; + link_cfg->postcursor = config->dp.postcursor; + + CHECK_RET(tegra_dc_dp_dpcd_read(dp, NV_DPCD_EDP_CONFIG_CAP, + &dpcd_data)); + link_cfg->alt_scramber_reset_cap = + (dpcd_data & NV_DPCD_EDP_CONFIG_CAP_ASC_RESET_YES) ? + 1 : 0; + link_cfg->only_enhanced_framing = + (dpcd_data & NV_DPCD_EDP_CONFIG_CAP_FRAMING_CHANGE_YES) ? + 1 : 0; + + link_cfg->lane_count = link_cfg->max_lane_count; + link_cfg->link_bw = link_cfg->max_link_bw; + link_cfg->enhanced_framing = link_cfg->support_enhanced_framing; + + tegra_dc_dp_calc_config(dp, config, link_cfg); + return 0; +} + +static int tegra_dc_dp_set_assr(struct tegra_dc_dp_data *dp, int ena) +{ + int ret; + + u8 dpcd_data = ena ? + NV_DPCD_EDP_CONFIG_SET_ASC_RESET_ENABLE : + NV_DPCD_EDP_CONFIG_SET_ASC_RESET_DISABLE; + + CHECK_RET(tegra_dc_dp_dpcd_write(dp, NV_DPCD_EDP_CONFIG_SET, + dpcd_data)); + + /* Also reset the scrambler to 0xfffe */ + tegra_dc_sor_set_internal_panel(&dp->sor, ena); + return 0; +} + +static int tegra_dp_set_link_bandwidth(struct tegra_dc_dp_data *dp, u8 link_bw) +{ + tegra_dc_sor_set_link_bandwidth(&dp->sor, link_bw); + + /* Sink side */ + return tegra_dc_dp_dpcd_write(dp, NV_DPCD_LINK_BANDWIDTH_SET, link_bw); +} + +static int tegra_dp_set_lane_count(struct tegra_dc_dp_data *dp, + const struct tegra_dc_dp_link_config *link_cfg) +{ + u8 dpcd_data; + int ret; + + /* check if panel support enhanched_framing */ + dpcd_data = link_cfg->lane_count; + if (link_cfg->enhanced_framing) + dpcd_data |= NV_DPCD_LANE_COUNT_SET_ENHANCEDFRAMING_T; + CHECK_RET(tegra_dc_dp_dpcd_write(dp, NV_DPCD_LANE_COUNT_SET, + dpcd_data)); + + tegra_dc_sor_set_lane_count(&dp->sor, link_cfg->lane_count); + + /* Also power down lanes that will not be used */ + return 0; +} + +#if DO_FAST_LINK_TRAINING +static int tegra_dc_dp_link_trained(struct tegra_dc_dp_data *dp, + const struct tegra_dc_dp_link_config *link_cfg) +{ + u32 lane; + u8 mask; + u8 data; + int ret; + + for (lane = 0; lane < link_cfg->lane_count; ++lane) { + CHECK_RET(tegra_dc_dp_dpcd_read(dp, (lane/2) ? + NV_DPCD_LANE2_3_STATUS : NV_DPCD_LANE0_1_STATUS, + &data)); + mask = (lane & 1) ? + NV_DPCD_STATUS_LANEXPLUS1_CR_DONE_YES | + NV_DPCD_STATUS_LANEXPLUS1_CHN_EQ_DONE_YES | + NV_DPCD_STATUS_LANEXPLUS1_SYMBOL_LOCKED_YES : + NV_DPCD_STATUS_LANEX_CR_DONE_YES | + NV_DPCD_STATUS_LANEX_CHN_EQ_DONE_YES | + NV_DPCD_STATUS_LANEX_SYMBOL_LOCKED_YES; + if ((data & mask) != mask) + return -1; + } + return 0; +} +#endif /* DO_FAST_LINK_TRAINING */ + +static int tegra_dp_channel_eq_status(struct tegra_dc_dp_data *dp) +{ + u32 cnt; + u32 n_lanes = dp->link_cfg.lane_count; + u8 data; + u8 ce_done = 1; + + for (cnt = 0; cnt < n_lanes / 2; cnt++) { + tegra_dc_dp_dpcd_read(dp, (NV_DPCD_LANE0_1_STATUS + cnt), + &data); + + if (n_lanes == 1) { + ce_done = + (data & (0x1 << NV_DPCD_STATUS_LANEX_CHN_EQ_DONE_SHIFT)) && + (data & (0x1 << NV_DPCD_STATUS_LANEX_SYMBOL_LOCKED_SHFIT)); + break; + } else + if (!(data & (0x1 << NV_DPCD_STATUS_LANEX_CHN_EQ_DONE_SHIFT)) || + !(data & (0x1 << NV_DPCD_STATUS_LANEX_SYMBOL_LOCKED_SHFIT)) || + !(data & (0x1 << NV_DPCD_STATUS_LANEXPLUS1_CHN_EQ_DONE_SHIFT)) || + !(data & (0x1 << NV_DPCD_STATUS_LANEXPLUS1_SYMBOL_LOCKED_SHIFT))) + return 0; + } + + if (ce_done) { + tegra_dc_dp_dpcd_read(dp, NV_DPCD_LANE_ALIGN_STATUS_UPDATED, + &data); + if (!(data & NV_DPCD_LANE_ALIGN_STATUS_UPDATED_DONE_YES)) + ce_done = 0; + } + + return ce_done; +} + +static u8 tegra_dp_clock_recovery_status(struct tegra_dc_dp_data *dp) +{ + u32 cnt; + u32 n_lanes = dp->link_cfg.lane_count; + u8 data_ptr; + + for (cnt = 0; cnt < n_lanes / 2; cnt++) { + tegra_dc_dp_dpcd_read(dp, + (NV_DPCD_LANE0_1_STATUS + cnt), &data_ptr); + + if (n_lanes == 1) + return (data_ptr & NV_DPCD_STATUS_LANEX_CR_DONE_YES) ? 1 : 0; + else if (!(data_ptr & NV_DPCD_STATUS_LANEX_CR_DONE_YES) || + !(data_ptr & (NV_DPCD_STATUS_LANEXPLUS1_CR_DONE_YES))) + return 0; + } + + return 1; +} + +static void tegra_dp_lt_adjust(struct tegra_dc_dp_data *dp, + u32 pe[4], u32 vs[4], u32 pc[4], + u8 pc_supported) +{ + size_t cnt; + u8 data_ptr; + u32 n_lanes = dp->link_cfg.lane_count; + + for (cnt = 0; cnt < n_lanes / 2; cnt++) { + tegra_dc_dp_dpcd_read(dp, + (NV_DPCD_LANE0_1_ADJUST_REQ + cnt), &data_ptr); + pe[2 * cnt] = (data_ptr & NV_DPCD_ADJUST_REQ_LANEX_PE_MASK) >> + NV_DPCD_ADJUST_REQ_LANEX_PE_SHIFT; + vs[2 * cnt] = (data_ptr & NV_DPCD_ADJUST_REQ_LANEX_DC_MASK) >> + NV_DPCD_ADJUST_REQ_LANEX_DC_SHIFT; + pe[1 + 2 * cnt] = + (data_ptr & NV_DPCD_ADJUST_REQ_LANEXPLUS1_PE_MASK) >> + NV_DPCD_ADJUST_REQ_LANEXPLUS1_PE_SHIFT; + vs[1 + 2 * cnt] = + (data_ptr & NV_DPCD_ADJUST_REQ_LANEXPLUS1_DC_MASK) >> + NV_DPCD_ADJUST_REQ_LANEXPLUS1_DC_SHIFT; + } + if (pc_supported) { + tegra_dc_dp_dpcd_read(dp, + NV_DPCD_ADJUST_REQ_POST_CURSOR2, &data_ptr); + for (cnt = 0; cnt < n_lanes; cnt++) { + pc[cnt] = (data_ptr >> + NV_DPCD_ADJUST_REQ_POST_CURSOR2_LANE_SHIFT(cnt)) & + NV_DPCD_ADJUST_REQ_POST_CURSOR2_LANE_MASK; + } + } +} + +static inline u32 tegra_dp_wait_aux_training(struct tegra_dc_dp_data *dp, + u8 is_clk_recovery) +{ + if (!dp->link_cfg.aux_rd_interval) + is_clk_recovery ? udelay(200) : + udelay(500); + else + mdelay(dp->link_cfg.aux_rd_interval * 4); + + return dp->link_cfg.aux_rd_interval; +} + +static void tegra_dp_tpg(struct tegra_dc_dp_data *dp, u32 tp, u32 n_lanes) +{ + u8 data = (tp == training_pattern_disabled) + ? (tp | NV_DPCD_TRAINING_PATTERN_SET_SC_DISABLED_F) + : (tp | NV_DPCD_TRAINING_PATTERN_SET_SC_DISABLED_T); + + tegra_dc_sor_set_dp_linkctl(&dp->sor, 1, tp, &dp->link_cfg); + tegra_dc_dp_dpcd_write(dp, NV_DPCD_TRAINING_PATTERN_SET, data); +} + +static int tegra_dp_link_config(struct tegra_dc_dp_data *dp, + const struct tegra_dc_dp_link_config *link_cfg) +{ + u8 dpcd_data; + u32 retry; + + if (link_cfg->lane_count == 0) { + printk(BIOS_ERR, "dp: error: lane count is 0. " + "Can not set link config.\n"); + return DP_LT_FAILED; + } + + /* Set power state if it is not in normal level */ + if (tegra_dc_dp_dpcd_read(dp, NV_DPCD_SET_POWER, &dpcd_data)) + return DP_LT_FAILED; + + if (dpcd_data == NV_DPCD_SET_POWER_VAL_D3_PWRDWN) { + dpcd_data = NV_DPCD_SET_POWER_VAL_D0_NORMAL; + + /* DP spec requires 3 retries */ + for (retry = 3; retry > 0; --retry) { + if (tegra_dc_dp_dpcd_write(dp, NV_DPCD_SET_POWER, + dpcd_data)) + break; + if (retry == 1) { + printk(BIOS_ERR, "dp: Failed to set DP panel" + " power\n"); + return DP_LT_FAILED; + } + } + } + + /* Enable ASSR if possible */ + if (link_cfg->alt_scramber_reset_cap) + if (tegra_dc_dp_set_assr(dp, 1)) + return DP_LT_FAILED; + + if (tegra_dp_set_link_bandwidth(dp, link_cfg->link_bw)) { + printk(BIOS_ERR, "dp: Failed to set link bandwidth\n"); + return DP_LT_FAILED; + } + if (tegra_dp_set_lane_count(dp, link_cfg)) { + printk(BIOS_ERR, "dp: Failed to set lane count\n"); + return DP_LT_FAILED; + } + tegra_dc_sor_set_dp_linkctl(&dp->sor, 1, training_pattern_none, + link_cfg); + return DP_LT_SUCCESS; +} + +static int tegra_dp_lower_link_config(struct tegra_dc_dp_data *dp, + struct tegra_dc_dp_link_config *cfg) +{ + struct tegra_dc_dp_link_config tmp_cfg; + + tmp_cfg = dp->link_cfg; + cfg->is_valid = 0; + + if (_tegra_dp_lower_link_config(dp, cfg)) + goto fail; + + if (tegra_dc_dp_calc_config(dp, dp->dc->config, cfg)) + goto fail; + tegra_dp_link_config(dp, cfg); + + return DP_LT_SUCCESS; +fail: + dp->link_cfg = tmp_cfg; + tegra_dp_link_config(dp, &tmp_cfg); + return DP_LT_FAILED; +} + +static void tegra_dp_lt_config(struct tegra_dc_dp_data *dp, + u32 pe[4], u32 vs[4], u32 pc[4]) +{ + struct tegra_dc_sor_data *sor = &dp->sor; + u32 n_lanes = dp->link_cfg.lane_count; + u8 pc_supported = dp->link_cfg.tps3_supported; + u32 cnt; + u32 val; + + for (cnt = 0; cnt < n_lanes; cnt++) { + u32 mask = 0; + u32 pe_reg, vs_reg, pc_reg; + u32 shift = 0; + + switch (cnt) { + case 0: + mask = NV_SOR_PR_LANE2_DP_LANE0_MASK; + shift = NV_SOR_PR_LANE2_DP_LANE0_SHIFT; + break; + case 1: + mask = NV_SOR_PR_LANE1_DP_LANE1_MASK; + shift = NV_SOR_PR_LANE1_DP_LANE1_SHIFT; + break; + case 2: + mask = NV_SOR_PR_LANE0_DP_LANE2_MASK; + shift = NV_SOR_PR_LANE0_DP_LANE2_SHIFT; + break; + case 3: + mask = NV_SOR_PR_LANE3_DP_LANE3_MASK; + shift = NV_SOR_PR_LANE3_DP_LANE3_SHIFT; + break; + default: + printk(BIOS_ERR, + "dp: incorrect lane cnt\n"); + } + + pe_reg = tegra_dp_pe_regs[pc[cnt]][vs[cnt]][pe[cnt]]; + vs_reg = tegra_dp_vs_regs[pc[cnt]][vs[cnt]][pe[cnt]]; + pc_reg = tegra_dp_pc_regs[pc[cnt]][vs[cnt]][pe[cnt]]; + + tegra_dp_set_pe_vs_pc(sor, mask, pe_reg << shift, + vs_reg << shift, pc_reg << shift, pc_supported); + } + + tegra_dp_disable_tx_pu(&dp->sor); + udelay(20); + + for (cnt = 0; cnt < n_lanes; cnt++) { + u32 max_vs_flag = tegra_dp_is_max_vs(pe[cnt], vs[cnt]); + u32 max_pe_flag = tegra_dp_is_max_pe(pe[cnt], vs[cnt]); + + val = (vs[cnt] << NV_DPCD_TRAINING_LANEX_SET_DC_SHIFT) | + (max_vs_flag ? + NV_DPCD_TRAINING_LANEX_SET_DC_MAX_REACHED_T : + NV_DPCD_TRAINING_LANEX_SET_DC_MAX_REACHED_F) | + (pe[cnt] << NV_DPCD_TRAINING_LANEX_SET_PE_SHIFT) | + (max_pe_flag ? + NV_DPCD_TRAINING_LANEX_SET_PE_MAX_REACHED_T : + NV_DPCD_TRAINING_LANEX_SET_PE_MAX_REACHED_F); + tegra_dc_dp_dpcd_write(dp, + (NV_DPCD_TRAINING_LANE0_SET + cnt), val); + } + + if (pc_supported) { + for (cnt = 0; cnt < n_lanes / 2; cnt++) { + u32 max_pc_flag0 = tegra_dp_is_max_pc(pc[cnt]); + u32 max_pc_flag1 = tegra_dp_is_max_pc(pc[cnt + 1]); + val = (pc[cnt] << NV_DPCD_LANEX_SET2_PC2_SHIFT) | + (max_pc_flag0 ? + NV_DPCD_LANEX_SET2_PC2_MAX_REACHED_T : + NV_DPCD_LANEX_SET2_PC2_MAX_REACHED_F) | + (pc[cnt + 1] << + NV_DPCD_LANEXPLUS1_SET2_PC2_SHIFT) | + (max_pc_flag1 ? + NV_DPCD_LANEXPLUS1_SET2_PC2_MAX_REACHED_T : + NV_DPCD_LANEXPLUS1_SET2_PC2_MAX_REACHED_F); + tegra_dc_dp_dpcd_write(dp, + (NV_DPCD_TRAINING_LANE0_1_SET2 + cnt), val); + } + } +} + +static int _tegra_dp_channel_eq(struct tegra_dc_dp_data *dp, u32 pe[4], + u32 vs[4], u32 pc[4], u8 pc_supported, + u32 n_lanes) +{ + u32 retry_cnt; + + for (retry_cnt = 0; retry_cnt < 4; retry_cnt++) { + if (retry_cnt) { + tegra_dp_lt_adjust(dp, pe, vs, pc, pc_supported); + tegra_dp_lt_config(dp, pe, vs, pc); + } + + tegra_dp_wait_aux_training(dp, 0); + + if (!tegra_dp_clock_recovery_status(dp)) { + printk(BIOS_ERR, "dp: CR failed in channel EQ" + " sequence!\n"); + break; + } + + if (tegra_dp_channel_eq_status(dp)) + return DP_LT_SUCCESS; + } + + return DP_LT_FAILED; +} + +static int tegra_dp_channel_eq(struct tegra_dc_dp_data *dp, + u32 pe[4], u32 vs[4], u32 pc[4]) +{ + u32 n_lanes = dp->link_cfg.lane_count; + u8 pc_supported = dp->link_cfg.tps3_supported; + int err; + u32 tp_src = training_pattern_2; + + if (pc_supported) + tp_src = training_pattern_3; + + tegra_dp_tpg(dp, tp_src, n_lanes); + + err = _tegra_dp_channel_eq(dp, pe, vs, pc, pc_supported, n_lanes); + + tegra_dp_tpg(dp, training_pattern_disabled, n_lanes); + + return err; +} + +static int _tegra_dp_clk_recovery(struct tegra_dc_dp_data *dp, u32 pe[4], + u32 vs[4], u32 pc[4], u8 pc_supported, + u32 n_lanes) +{ + u32 vs_temp[4]; + u32 retry_cnt = 0; + + do { + tegra_dp_lt_config(dp, pe, vs, pc); + tegra_dp_wait_aux_training(dp, 1); + + if (tegra_dp_clock_recovery_status(dp)) + return DP_LT_SUCCESS; + + memcpy(vs_temp, vs, sizeof(vs_temp)); + tegra_dp_lt_adjust(dp, pe, vs, pc, pc_supported); + + if (memcmp(vs_temp, vs, sizeof(vs_temp))) + retry_cnt = 0; + else + ++retry_cnt; + } while (retry_cnt < 5); + + return DP_LT_FAILED; +} + +static int tegra_dp_clk_recovery(struct tegra_dc_dp_data *dp, + u32 pe[4], u32 vs[4], u32 pc[4]) +{ + u32 n_lanes = dp->link_cfg.lane_count; + u8 pc_supported = dp->link_cfg.tps3_supported; + int err; + + tegra_dp_tpg(dp, training_pattern_1, n_lanes); + + err = _tegra_dp_clk_recovery(dp, pe, vs, pc, pc_supported, n_lanes); + if (err < 0) + tegra_dp_tpg(dp, training_pattern_disabled, n_lanes); + + return err; +} + +static int tegra_dc_dp_full_link_training(struct tegra_dc_dp_data *dp) +{ + struct tegra_dc_sor_data *sor = &dp->sor; + int err; + u32 pe[4], vs[4], pc[4]; + + printk(BIOS_INFO, "dp: %s\n", __func__); + tegra_sor_precharge_lanes(sor); + +retry_cr: + memset(pe, preEmphasis_Disabled, sizeof(pe)); + memset(vs, driveCurrent_Level0, sizeof(vs)); + memset(pc, postCursor2_Level0, sizeof(pc)); + + err = tegra_dp_clk_recovery(dp, pe, vs, pc); + if (err != DP_LT_SUCCESS) { + if (!tegra_dp_lower_link_config(dp, &dp->link_cfg)) + goto retry_cr; + + printk(BIOS_ERR, "dp: clk recovery failed\n"); + goto fail; + } + + err = tegra_dp_channel_eq(dp, pe, vs, pc); + if (err != DP_LT_SUCCESS) { + if (!tegra_dp_lower_link_config(dp, &dp->link_cfg)) + goto retry_cr; + + printk(BIOS_ERR, + "dp: channel equalization failed\n"); + goto fail; + } + + tegra_dc_dp_dump_link_cfg(dp, &dp->link_cfg); + + return 0; + +fail: + return err; +} + +/* + * All link training functions are ported from kernel dc driver. + * See more details at drivers/video/tegra/dc/dp.c + */ +#if DO_FAST_LINK_TRAINING +static int tegra_dc_dp_fast_link_training(struct tegra_dc_dp_data *dp, + const struct tegra_dc_dp_link_config *link_cfg) +{ + struct tegra_dc_sor_data *sor = &dp->sor; + u8 link_bw; + u8 lane_count; + u16 data16; + u32 data32; + u32 size; + u32 status; + int j; + u32 mask = 0xffff >> ((4 - link_cfg->lane_count) * 4); + + + printk(BIOS_INFO, "dp: %s\n", __func__); + + tegra_dc_sor_set_lane_parm(sor, link_cfg); + tegra_dc_dp_dpcd_write(dp, NV_DPCD_MAIN_LINK_CHANNEL_CODING_SET, + NV_DPCD_MAIN_LINK_CHANNEL_CODING_SET_ANSI_8B10B); + + /* Send TP1 */ + tegra_dc_sor_set_dp_linkctl(sor, 1, training_pattern_1, link_cfg); + tegra_dc_dp_dpcd_write(dp, NV_DPCD_TRAINING_PATTERN_SET, + NV_DPCD_TRAINING_PATTERN_SET_TPS_TP1); + + for (j = 0; j < link_cfg->lane_count; ++j) + tegra_dc_dp_dpcd_write(dp, NV_DPCD_TRAINING_LANE0_SET + j, + 0x24); + udelay(520); + + size = sizeof(data16); + tegra_dc_dpaux_read(dp, DPAUX_DP_AUXCTL_CMD_AUXRD, + NV_DPCD_LANE0_1_STATUS, (u8 *)&data16, &size, &status); + status = mask & 0x1111; + if ((data16 & status) != status) { + printk(BIOS_ERR, + "dp: Link training error for TP1 (%#x)\n", data16); + return -EFAULT; + } + + /* enable ASSR */ + tegra_dc_dp_set_assr(dp, link_cfg->scramble_ena); + tegra_dc_sor_set_dp_linkctl(sor, 1, training_pattern_3, link_cfg); + + tegra_dc_dp_dpcd_write(dp, NV_DPCD_TRAINING_PATTERN_SET, + link_cfg->link_bw == 20 ? 0x23 : 0x22); + for (j = 0; j < link_cfg->lane_count; ++j) + tegra_dc_dp_dpcd_write(dp, NV_DPCD_TRAINING_LANE0_SET + j, + 0x24); + udelay(520); + + size = sizeof(data32); + tegra_dc_dpaux_read(dp, DPAUX_DP_AUXCTL_CMD_AUXRD, + NV_DPCD_LANE0_1_STATUS, (u8 *)&data32, &size, &status); + if ((data32 & mask) != (0x7777 & mask)) { + printk(BIOS_ERR, + "dp: Link training error for TP2/3 (0x%x)\n", data32); + return -EFAULT; + } + + tegra_dc_sor_set_dp_linkctl(sor, 1, training_pattern_disabled, + link_cfg); + tegra_dc_dp_dpcd_write(dp, NV_DPCD_TRAINING_PATTERN_SET, 0); + + if (tegra_dc_dp_link_trained(dp, link_cfg)) { + tegra_dc_sor_read_link_config(&dp->sor, &link_bw, + &lane_count); + printk(BIOS_ERR, + "Fast link trainging failed, link bw %d, lane # %d\n", + link_bw, lane_count); + return -EFAULT; + } + + printk(BIOS_INFO, + "Fast link trainging succeeded, link bw %d, lane %d\n", + link_cfg->link_bw, link_cfg->lane_count); + + return 0; +} +#endif /* DO_FAST_LINK_TRAINING */ + +static int tegra_dp_do_link_training(struct tegra_dc_dp_data *dp, + const struct tegra_dc_dp_link_config *link_cfg) +{ + u8 link_bw; + u8 lane_count; +#if DO_FAST_LINK_TRAINING + int ret; + + /* Now do the fast link training for eDP */ + ret = tegra_dc_dp_fast_link_training(dp, link_cfg); + if (ret) { + printk(BIOS_ERR, "dp: fast link training failed\n"); + + /* Try full link training then */ + if (tegra_dc_dp_full_link_training(dp)) { + printk(BIOS_ERR, "dp: full link training failed\n"); + return ret; + } + } else { + /* set to a known-good drive setting if fast link succeeded */ + tegra_dc_sor_set_voltage_swing(&dp->sor); + } +#else + if (tegra_dc_dp_full_link_training(dp)) { + printk(BIOS_ERR, "dp: full link training failed\n"); + return -EFAULT; + } +#endif + + /* Everything goes well, double check the link config */ + /* TODO: record edc/c2 data for debugging */ + tegra_dc_sor_read_link_config(&dp->sor, &link_bw, &lane_count); + + if ((link_cfg->link_bw == link_bw) && + (link_cfg->lane_count == lane_count)) + return 0; + else + return -EFAULT; +} + +static int tegra_dc_dp_explore_link_cfg(struct tegra_dc_dp_data *dp, + struct tegra_dc_dp_link_config *link_cfg, + const struct soc_nvidia_tegra210_config *config) +{ + struct tegra_dc_dp_link_config temp_cfg; + + if (!config->pixel_clock || !config->xres || !config->yres) { + printk(BIOS_ERR, + "dp: error mode configuration"); + return -EINVAL; + } + if (!link_cfg->max_link_bw || !link_cfg->max_lane_count) { + printk(BIOS_ERR, + "dp: error link configuration"); + return -EINVAL; + } + + link_cfg->is_valid = 0; + + memcpy(&temp_cfg, link_cfg, sizeof(temp_cfg)); + + temp_cfg.link_bw = temp_cfg.max_link_bw; + temp_cfg.lane_count = temp_cfg.max_lane_count; + + /* + * set to max link config + */ + if ((!tegra_dc_dp_calc_config(dp, config, &temp_cfg)) && + (!tegra_dp_link_config(dp, &temp_cfg)) && + (!tegra_dp_do_link_training(dp, &temp_cfg))) + /* the max link cfg is doable */ + memcpy(link_cfg, &temp_cfg, sizeof(temp_cfg)); + + return link_cfg->is_valid ? 0 : -EFAULT; +} + +static void tegra_dp_update_config(struct tegra_dc_dp_data *dp, + struct soc_nvidia_tegra210_config *config) +{ + struct edid edid; + u8 buf[128] = {0}; + u32 size = sizeof(buf), aux_stat = 0; + + printk(BIOS_ERR, "%s: enable r/w dump.\n", + __func__); + + tegra_dc_dpaux_enable(dp); + if (tegra_dc_i2c_aux_read(dp, TEGRA_EDID_I2C_ADDRESS, 0, buf, &size, + &aux_stat)) { + printk(BIOS_ERR, "%s: Failed to read EDID. Use defaults.\n", + __func__); + return; + } + + if (decode_edid(buf, sizeof(buf), &edid)) { + printk(BIOS_ERR, "%s: Failed to decode EDID. Use defaults.\n", + __func__); + return; + } + + config->xres = config->display_xres = edid.ha; + config->yres = config->display_yres = edid.va; + + config->pixel_clock = edid.pixel_clock * 1000; + + config->hfront_porch = edid.hso; + config->hsync_width = edid.hspw; + config->hback_porch = edid.hbl - edid.hso - edid.hspw; + + config->vfront_porch = edid.vso; + config->vsync_width = edid.vspw; + config->vback_porch = edid.vbl - edid.vso - edid.vspw; + + /** + * Note edid->framebuffer_bits_per_pixel is currently hard-coded as 32, + * so we should keep the default value in device config. + * + * EDID v1.3 panels may not have color depth info, so we need to check + * if these values are zero before updating config. + */ + if (edid.panel_bits_per_pixel) + config->panel_bits_per_pixel = edid.panel_bits_per_pixel; + if (edid.panel_bits_per_color) + config->color_depth = edid.panel_bits_per_color; + printk(BIOS_SPEW, "%s: configuration updated by EDID.\n", __func__); +} + +void dp_init(void *_config) +{ + struct soc_nvidia_tegra210_config *config = (void *)_config; + struct tegra_dc *dc = config->dc_data; + struct tegra_dc_dp_data *dp = &dp_data; + + /* set up links among config, dc, dp and sor */ + dp->dc = dc; + dc->out = dp; + dp->sor.dc = dc; + + dp->sor.power_is_up = 0; + dp->sor.base = (void *)TEGRA_ARM_SOR; + dp->sor.pmc_base = (void *)TEGRA_PMC_BASE; + dp->sor.portnum = 0; + dp->sor.link_cfg = &dp->link_cfg; + dp->aux_base = (void *)TEGRA_ARM_DPAUX; + dp->link_cfg.is_valid = 0; + dp->enabled = 0; + + tegra_dp_update_config(dp, config); +} + +static void tegra_dp_hpd_config(struct tegra_dc_dp_data *dp, + struct soc_nvidia_tegra210_config *config) +{ + u32 val; + + val = config->dp.hpd_plug_min_us | + (config->dp.hpd_unplug_min_us << + DPAUX_HPD_CONFIG_UNPLUG_MIN_TIME_SHIFT); + tegra_dpaux_writel(dp, DPAUX_HPD_CONFIG, val); + + tegra_dpaux_writel(dp, DPAUX_HPD_IRQ_CONFIG, config->dp.hpd_irq_min_us); +} + +static int tegra_dp_hpd_plug(struct tegra_dc_dp_data *dp, int timeout_ms) +{ + u32 val; + u32 timeout = timeout_ms * 1000; + do { + val = tegra_dpaux_readl(dp, DPAUX_DP_AUXSTAT); + if (val & DPAUX_DP_AUXSTAT_HPD_STATUS_PLUGGED) + return 0; + udelay(100); + timeout -= 100; + } while (timeout > 0); + return -1; +} + +static int tegra_dc_dp_sink_out_of_sync(struct tegra_dc_dp_data *dp, + u32 delay_ms) +{ + u8 dpcd_data; + int out_of_sync; + + mdelay(delay_ms); + tegra_dc_dp_dpcd_read(dp, NV_DPCD_SINK_STATUS, &dpcd_data); + + out_of_sync = ((dpcd_data & NV_DPCD_SINK_STATUS_PORT0_IN_SYNC) != + NV_DPCD_SINK_STATUS_PORT0_IN_SYNC); + + if (out_of_sync) + printk(BIOS_ERR, + "SINK receive port 0 is out of synchronization\n"); + else + printk(BIOS_INFO, + "SINK is in synchronization\n"); + + return out_of_sync; +} + +static void tegra_dc_dp_check_sink(struct tegra_dc_dp_data *dp, + struct soc_nvidia_tegra210_config *config) +{ + + u8 max_retry = 3; + int delay_frame; + + /* DP TCON may skip some main stream frames, thus we need to wait + some delay before reading the DPCD SINK STATUS register, starting + from 5 */ + delay_frame = 5; + + while (tegra_dc_dp_sink_out_of_sync(dp, FRAME_IN_MS * delay_frame) && + max_retry--) { + tegra_dc_detach(&dp->sor); + if (tegra_dc_dp_explore_link_cfg(dp, &dp->link_cfg, config)) { + printk(BIOS_ERR, "dp: %s: error to configure link\n", + __func__); + continue; + } + + tegra_dc_sor_set_power_state(&dp->sor, 1); + tegra_dc_sor_attach(&dp->sor); + + /* Increase delay_frame for next try in case the sink is + skipping more frames */ + delay_frame += 10; + } +} + +void dp_enable(void *_dp) +{ + struct tegra_dc_dp_data *dp = _dp; + struct tegra_dc *dc = dp->dc; + struct soc_nvidia_tegra210_config *config = dc->config; + + u8 data; + u32 retry; + int ret; + + tegra_dc_dpaux_enable(dp); + + tegra_dp_hpd_config(dp, config); + if (tegra_dp_hpd_plug(dp, config->dp.vdd_to_hpd_delay_ms) < 0) { + printk(BIOS_ERR, "dp: hpd plug failed\n"); + goto error_enable; + } + + if (tegra_dc_dp_init_max_link_cfg(config, dp, &dp->link_cfg)) { + printk(BIOS_ERR, "dp: failed to init link configuration\n"); + goto error_enable; + } + + tegra_dc_sor_enable_dp(&dp->sor); + + tegra_dc_sor_set_panel_power(&dp->sor, 1); + + /* Write power on to DPCD */ + data = NV_DPCD_SET_POWER_VAL_D0_NORMAL; + retry = 0; + do { + ret = tegra_dc_dp_dpcd_write(dp, + NV_DPCD_SET_POWER, data); + } while ((retry++ < DP_POWER_ON_MAX_TRIES) && ret); + + if (ret || retry >= DP_POWER_ON_MAX_TRIES) { + printk(BIOS_ERR, + "dp: failed to power on panel (0x%x)\n", ret); + goto error_enable; + } + + /* Confirm DP is plugging status */ + if (!(tegra_dpaux_readl(dp, DPAUX_DP_AUXSTAT) & + DPAUX_DP_AUXSTAT_HPD_STATUS_PLUGGED)) { + printk(BIOS_ERR, "dp: could not detect HPD\n"); + goto error_enable; + } + + /* Check DP version */ + if (tegra_dc_dp_dpcd_read(dp, NV_DPCD_REV, &dp->revision)) + printk(BIOS_ERR, + "dp: failed to read the revision number from sink\n"); + + if (tegra_dc_dp_explore_link_cfg(dp, &dp->link_cfg, config)) { + printk(BIOS_ERR, "dp: error to configure link\n"); + goto error_enable; + } + + tegra_dc_sor_set_power_state(&dp->sor, 1); + tegra_dc_sor_attach(&dp->sor); + + tegra_dc_dp_check_sink(dp, config); + + /* + * Power down the unused lanes to save power + * (about hundreds milli-watts, varies from boards). + */ + tegra_dc_sor_power_down_unused_lanes(&dp->sor); + + dp->enabled = 1; +error_enable: + return; +} + +void dp_display_startup(device_t dev) +{ + struct soc_nvidia_tegra210_config *config = dev->chip_info; + struct display_controller *disp_ctrl = + (void *)config->display_controller; + + u32 framebuffer_size_mb = config->framebuffer_size / MiB; + u32 framebuffer_base_mb = config->framebuffer_base / MiB; + + struct pwm_controller *pwm = (void *)TEGRA_PWM_BASE; + struct tegra_dc *dc = &dc_data; + u32 plld_rate; + + printk(BIOS_INFO, "%s: entry: disp_ctrl: %p.\n", + __func__, disp_ctrl); + + if (disp_ctrl == NULL) { + printk(BIOS_ERR, "Error: No dc is assigned by dt.\n"); + return; + } + + dc->base = (void *)disp_ctrl; + dc->config = config; + config->dc_data = dc; + + /* Note dp_init may read EDID and change some config values. */ + dp_init(config); + + if (framebuffer_size_mb == 0) { + framebuffer_size_mb = ALIGN_UP(config->display_xres * + config->display_yres * + (config->framebuffer_bits_per_pixel / 8), MiB)/MiB; + } + + config->framebuffer_size = framebuffer_size_mb * MiB; + config->framebuffer_base = framebuffer_base_mb * MiB; + + /* The plld is programmed with the assumption of the SHIFT_CLK_DIVIDER + * and PIXEL_CLK_DIVIDER are zero (divide by 1). See the + * update_display_mode() for detail. + */ + plld_rate = clock_configure_plld(config->pixel_clock * 2); + if (plld_rate == 0) { + printk(BIOS_ERR, "dc: clock init failed\n"); + return; + } else if (plld_rate != config->pixel_clock * 2) { + printk(BIOS_WARNING, "dc: plld rounded to %u\n", plld_rate); + config->pixel_clock = plld_rate / 2; + } + + /* set disp1's clock source to PLLD_OUT0 */ + clock_configure_source(disp1, PLLD, (plld_rate/KHz)/2); + + /* Init dc */ + if (tegra_dc_init(disp_ctrl)) { + printk(BIOS_ERR, "dc: init failed\n"); + return; + } + + /* Configure dc mode */ + if (update_display_mode(disp_ctrl, config)) { + printk(BIOS_ERR, "dc: failed to configure display mode.\n"); + return; + } + + /* Enable dp */ + dp_enable(dc->out); + + /* Set up Tegra PWM n (where n is specified in config->dp.pwm) to drive the + * panel backlight. + */ + printk(BIOS_SPEW, "%s: enable panel backlight pwm\n", __func__); + WRITEL(((1 << NV_PWM_CSR_ENABLE_SHIFT) | + (220 << NV_PWM_CSR_PULSE_WIDTH_SHIFT) | /* 220/256 */ + 0x02e), /* frequency divider */ + &pwm->pwm[config->dp.pwm].csr); + + /* Set up window */ + update_window(config); + printk(BIOS_INFO, "%s: display init done.\n", __func__); + + /* Save panel mode to cb tables */ + pass_mode_info_to_payload(config); + + /* + * After this point, it is payload's responsibility to allocate + * framebuffer and sets the base address to dc's + * WINBUF_START_ADDR register and enables window by setting dc's + * DISP_DISP_WIN_OPTIONS register. + */ +} |