From 554192870297b1123c44ef068e9e305f81e253d0 Mon Sep 17 00:00:00 2001 From: Tom Warren Date: Tue, 16 Sep 2014 17:10:22 -0700 Subject: Ryu: Rewrite I2C6 mux init Do the absolute minimum needed to allow the DPAUX mux ctl write for I2C6. This leaves HOST1X off (reset and clock disabled) to avoid a conflict with any kernel display driver init. I2C6 init/enable will be moved to ramstage in the next CL. BUG=chrome-os-partner:31820 BRANCH=none TEST=Dumped Speaker Driver (AD SSM4567) regs on Ryu, looks good. Change-Id: I42106778a26c5a1d1483cc308b8314599c391539 Signed-off-by: Patrick Georgi Original-Commit-Id: 24a9ebfda31c620b24e5c765dc950b87e3e5587b Original-Change-Id: I0760222f1d7ccee207ae9871aeed3e2ddbca3dca Original-Signed-off-by: Tom Warren Original-Reviewed-on: https://chromium-review.googlesource.com/218900 Original-Reviewed-by: Aaron Durbin Reviewed-on: http://review.coreboot.org/9093 Tested-by: build bot (Jenkins) Reviewed-by: Stefan Reinauer --- src/soc/nvidia/tegra132/clk_rst.h | 2 +- src/soc/nvidia/tegra132/i2c6.c | 50 +++++++++++++++++++++++++-------------- 2 files changed, 33 insertions(+), 19 deletions(-) (limited to 'src/soc') diff --git a/src/soc/nvidia/tegra132/clk_rst.h b/src/soc/nvidia/tegra132/clk_rst.h index d0f1e342ce..485910586a 100644 --- a/src/soc/nvidia/tegra132/clk_rst.h +++ b/src/soc/nvidia/tegra132/clk_rst.h @@ -133,7 +133,7 @@ struct __attribute__ ((__packed__)) clk_rst_ctlr { u32 clk_out_enb_x; /* _CLK_OUT_ENB_X_0, 0x280 */ u32 clk_enb_x_set; /* _CLK_ENB_X_SET_0, 0x284 */ u32 clk_enb_x_clr; /* _CLK_ENB_X_CLR_0, 0x288 */ - u32 rst_devices_x; /* _RST_DEVICES_X_0, 0x28c */ + u32 rst_dev_x; /* _RST_DEVICES_X_0, 0x28c */ u32 rst_dev_x_set; /* _RST_DEV_X_SET_0, 0x290 */ u32 rst_dev_x_clr; /* _RST_DEV_X_CLR_0, 0x294 */ u32 _rsv19[23]; /* 0x298-2f0 */ diff --git a/src/soc/nvidia/tegra132/i2c6.c b/src/soc/nvidia/tegra132/i2c6.c index 4efba23ea7..af015057b3 100644 --- a/src/soc/nvidia/tegra132/i2c6.c +++ b/src/soc/nvidia/tegra132/i2c6.c @@ -51,15 +51,19 @@ static void remove_clamps(int id) ; } -static void enable_sor_periphs(void) +static void enable_sor_periph_clocks(void) { - u32 lclks = CLK_L_HOST1X; - u32 hclks = CLK_H_MIPI_CAL | CLK_H_HDMI | CLK_H_DSI; - u32 uclks = CLK_U_DSIB; - u32 wclks = CLK_W_DP2 | CLK_W_HDA2HDMICODEC; - u32 xclks = CLK_X_DPAUX | CLK_X_SOR0 | CLK_X_HDMI_AUDIO; + setbits_le32(&clk_rst->clk_out_enb_l, CLK_L_HOST1X); + setbits_le32(&clk_rst->clk_out_enb_x, CLK_X_DPAUX); - clock_enable(lclks, hclks, uclks, 0, wclks, xclks); + /* Give clocks time to stabilize. */ + udelay(IO_STABILIZATION_DELAY); +} + +static void disable_sor_periph_clocks(void) +{ + clrbits_le32(&clk_rst->clk_out_enb_l, CLK_L_HOST1X); + clrbits_le32(&clk_rst->clk_out_enb_x, CLK_X_DPAUX); /* Give clocks time to stabilize. */ udelay(IO_STABILIZATION_DELAY); @@ -67,32 +71,42 @@ static void enable_sor_periphs(void) static void unreset_sor_periphs(void) { - u32 lclks = CLK_L_HOST1X; - u32 hclks = CLK_H_MIPI_CAL | CLK_H_HDMI | CLK_H_DSI; - u32 uclks = CLK_U_DSIB; - u32 wclks = CLK_W_DP2 | CLK_W_HDA2HDMICODEC; - u32 xclks = CLK_X_DPAUX | CLK_X_SOR0 | CLK_X_HDMI_AUDIO; - - clock_clear_reset(lclks, hclks, uclks, 0, wclks, xclks); + clrbits_le32(&clk_rst->rst_dev_l, CLK_L_HOST1X); + clrbits_le32(&clk_rst->rst_dev_x, CLK_X_DPAUX); } void soc_configure_i2c6pad(void) { /* * I2C6 on Tegra124/132 requires some special init. - * The SOR block must be unpowergated, and several + * The SOR block must be unpowergated, and a couple of * display-based peripherals must be clocked and taken * out of reset so that a DPAUX register can be * configured to enable the I2C6 mux routing. + * Afterwards, we can disable clocks to the display blocks + * and put Host1X back in reset. DPAUX must remain out of + * reset and the SOR partition must remained unpowergated. */ power_ungate_partition(POWER_PARTID_SOR); - enable_sor_periphs(); - remove_clamps(POWER_PARTID_SOR); - unreset_sor_periphs(); /* Host1X needs a valid clock source so DPAUX can be accessed */ clock_configure_source(host1x, PLLP, 204000); + enable_sor_periph_clocks(); + remove_clamps(POWER_PARTID_SOR); + unreset_sor_periphs(); + /* Now we can write the I2C6 mux in DPAUX */ write32(I2C6_PADCTL, (void *)DPAUX_HYBRID_PADCTL); + + /* + * Delay before turning off Host1X/DPAUX clocks. + * This delay is needed to keep the sequence from + * hanging the system. + */ + udelay(CLOCK_PLL_STABLE_DELAY_US); + + /* Stop Host1X/DPAUX clocks and reset Host1X */ + disable_sor_periph_clocks(); + setbits_le32(&clk_rst->rst_dev_l, CLK_L_HOST1X); } -- cgit v1.2.3