From 2a16331f8c5030c0ca02749abac481acad4c1b64 Mon Sep 17 00:00:00 2001 From: Nico Huber Date: Mon, 6 Jan 2020 17:42:45 +0100 Subject: soc/intel/apl: Add panel power and backlight configuration Change-Id: Id8892ac7aafce1006831e2d9f2806919f5950756 Signed-off-by: Nico Huber Reviewed-on: https://review.coreboot.org/c/coreboot/+/40694 Tested-by: build bot (Jenkins) Reviewed-by: Angel Pons --- src/soc/intel/apollolake/Makefile.inc | 1 + src/soc/intel/apollolake/chip.h | 23 +++++++++++ src/soc/intel/apollolake/graphics.c | 75 +++++++++++++++++++++++++++++++++++ 3 files changed, 99 insertions(+) create mode 100644 src/soc/intel/apollolake/graphics.c (limited to 'src/soc/intel/apollolake') diff --git a/src/soc/intel/apollolake/Makefile.inc b/src/soc/intel/apollolake/Makefile.inc index 517c8ca97d..a20a554be1 100644 --- a/src/soc/intel/apollolake/Makefile.inc +++ b/src/soc/intel/apollolake/Makefile.inc @@ -54,6 +54,7 @@ ramstage-y += cpu.c ramstage-y += chip.c ramstage-y += cse.c ramstage-y += elog.c +ramstage-y += graphics.c ramstage-y += gspi.c ramstage-y += heci.c ramstage-y += i2c.c diff --git a/src/soc/intel/apollolake/chip.h b/src/soc/intel/apollolake/chip.h index ce446a063a..521d3ee06c 100644 --- a/src/soc/intel/apollolake/chip.h +++ b/src/soc/intel/apollolake/chip.h @@ -24,6 +24,22 @@ enum pnp_settings { PNP_PERF_POWER, }; +struct soc_intel_apl_pp { + unsigned int up_delay_ms; + unsigned int down_delay_ms; + unsigned int cycle_delay_ms; + unsigned int backlight_on_delay_ms; + unsigned int backlight_off_delay_ms; +}; + +struct soc_intel_apl_blc { + unsigned int pwm_hz; + enum { + GPU_BACKLIGHT_POLARITY_HIGH = 0, + GPU_BACKLIGHT_POLARITY_LOW, + } polarity; +}; + struct soc_intel_apollolake_config { /* Common structure containing soc config data required by common code*/ @@ -32,6 +48,13 @@ struct soc_intel_apollolake_config { /* Common struct containing power limits configuration info */ struct soc_power_limits_config power_limits_config; + /* IGD panel configuration */ + struct soc_intel_apl_pp gpu_pp[2]; + /* Second backlight control shares logic with other pins (aka. display + utility pin). Be sure it's used for PWM before setting any value for + the secondary controls. */ + struct soc_intel_apl_blc gpu_blc[2]; + /* * Mapping from PCIe root port to CLKREQ input on the SOC. The SOC has * four CLKREQ inputs, but six root ports. Root ports without an diff --git a/src/soc/intel/apollolake/graphics.c b/src/soc/intel/apollolake/graphics.c new file mode 100644 index 0000000000..24d47721ab --- /dev/null +++ b/src/soc/intel/apollolake/graphics.c @@ -0,0 +1,75 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ + +#include +#include +#include +#include +#include +#include +#include + +#include "chip.h" + +static void graphics_configure_panelpower( + const struct soc_intel_apl_pp *const pp, + uint8_t *const mmio, const unsigned int panel_idx) +{ + const unsigned int offset = panel_idx * 0x100; + uint32_t reg32; + + reg32 = ((DIV_ROUND_UP(pp->cycle_delay_ms, 100) + 1) & 0x1f) | PANEL_POWER_RESET; + write32(mmio + PCH_PP_CONTROL + offset, reg32); + + reg32 = pp->up_delay_ms * 10 << 16; + reg32 |= pp->backlight_on_delay_ms * 10; + write32(mmio + PCH_PP_ON_DELAYS + offset, reg32); + + reg32 = pp->down_delay_ms * 10 << 16; + reg32 |= pp->backlight_off_delay_ms * 10; + write32(mmio + PCH_PP_OFF_DELAYS + offset, reg32); +} + +static void graphics_configure_backlight( + const struct soc_intel_apl_blc *const blc, + uint8_t *const mmio, const unsigned int panel_idx) +{ + if (!blc->pwm_hz) + return; + + const unsigned int pwm_period = 19200 * 1000 / blc->pwm_hz; + write32(mmio + BXT_BLC_PWM_FREQ(panel_idx), pwm_period); + write32(mmio + BXT_BLC_PWM_DUTY(panel_idx), pwm_period / 2); + write32(mmio + BXT_BLC_PWM_CTL(panel_idx), + (blc->polarity ? BXT_BLC_PWM_POLARITY : 0)); + + /* Second backlight control uses display utility pin. */ + if (panel_idx == 1) { + write32(mmio + UTIL_PIN_CTL, 0); /* Make sure it's disabled, don't know + what FSP might have done already. */ + write32(mmio + UTIL_PIN_CTL, UTIL_PIN_MODE_PWM | UTIL_PIN_ENABLE); + } +} + +void graphics_soc_init(struct device *const dev) +{ + const struct soc_intel_apollolake_config *const conf = dev->chip_info; + const struct resource *mmio_res; + void *mmio; + unsigned int i; + + /* Some hardware configuration first. */ + + if (!conf) + return; + + mmio_res = probe_resource(dev, PCI_BASE_ADDRESS_0); + if (!mmio_res || !mmio_res->base) + return; + mmio = (void *)(uintptr_t)mmio_res->base; + + for (i = 0; i < ARRAY_SIZE(conf->gpu_pp); ++i) + graphics_configure_panelpower(&conf->gpu_pp[i], mmio, i); + + for (i = 0; i < ARRAY_SIZE(conf->gpu_blc); ++i) + graphics_configure_backlight(&conf->gpu_blc[i], mmio, i); +} -- cgit v1.2.3