nb/intel/hsw,soc/intel/{bdw,skl,apl},mb/*: unify dt panel settings

There are multiple different devicetree setting formats for graphics
panel settings present in coreboot. Replace the ones for the platforms
that already have (mostly) unified gma/graphics setup code by a unified
struct in the gma driver. Hook it up in HSW, BDW, SKL, and APL and adapt
the devicetrees accordingly.

Always ensure that values don't overflow by applying appropriate masks.

The remaining platforms implementing panel settings (GM45, i945, ILK and
SNB) can be migrated later after unifying their gma/graphics setup code.

Signed-off-by: Michael Niewöhner <foss@mniewoehner.de>
Change-Id: I445defe01d5fbf9a69cf05cf1b5bd6c7c2c1725e
Reviewed-on: https://review.coreboot.org/c/coreboot/+/48885
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Nico Huber <nico.h@gmx.de>

2 files changed, 22 insertions, 36 deletions

diff --git a/src/soc/intel/apollolake/chip.h b/src/soc/intel/apollolake/chip.h
index 6e4c82d5a4..c94b7ef180 100644
--- a/src/soc/intel/apollolake/chip.h
+++ b/src/soc/intel/apollolake/chip.h
@@ -4,6 +4,7 @@
 #define _SOC_APOLLOLAKE_CHIP_H_
 
 #include <commonlib/helpers.h>
+#include <drivers/intel/gma/gma.h>
 #include <intelblocks/cfg.h>
 #include <intelblocks/gspi.h>
 #include <soc/gpe.h>
@@ -24,22 +25,6 @@ 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*/
@@ -48,12 +33,13 @@ 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];
+	/*
+	 * IGD panel configuration
+	 *
+	 * Second backlight control shares logic with other pins (aka. display utility pin).
+	 * Be sure it's used for PWM before setting any secondary backlight value.
+	 */
+	struct i915_gpu_panel_config panel_cfg[2];
 
 	/*
 	 * Mapping from PCIe root port to CLKREQ input on the SOC. The SOC has
diff --git a/src/soc/intel/apollolake/graphics.c b/src/soc/intel/apollolake/graphics.c
index 4144479fe8..c24ccdfee2 100644
--- a/src/soc/intel/apollolake/graphics.c
+++ b/src/soc/intel/apollolake/graphics.c
@@ -11,37 +11,37 @@
 #include "chip.h"
 
 static void graphics_configure_panelpower(
-		const struct soc_intel_apl_pp *const pp,
+		const struct i915_gpu_panel_config *const panel_cfg,
 		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) << 4 & 0x1f0;
+	reg32 = ((DIV_ROUND_UP(panel_cfg->cycle_delay_ms, 100) + 1) & 0x1f) << 4;
 	reg32 |= PANEL_POWER_RESET;
 	write32(mmio + PCH_PP_CONTROL + offset, reg32);
 
-	reg32 = pp->up_delay_ms * 10 << 16;
-	reg32 |= pp->backlight_on_delay_ms * 10;
+	reg32 = ((panel_cfg->up_delay_ms * 10) & 0x1fff) << 16;
+	reg32 |= (panel_cfg->backlight_on_delay_ms * 10) & 0x1fff;
 	write32(mmio + PCH_PP_ON_DELAYS + offset, reg32);
 
-	reg32 = pp->down_delay_ms * 10 << 16;
-	reg32 |= pp->backlight_off_delay_ms * 10;
+	reg32 = ((panel_cfg->down_delay_ms * 10) & 0x1fff) << 16;
+	reg32 |= (panel_cfg->backlight_off_delay_ms * 10) & 0x1fff;
 	write32(mmio + PCH_PP_OFF_DELAYS + offset, reg32);
 }
 
 static void graphics_configure_backlight(
-		const struct soc_intel_apl_blc *const blc,
+		const struct i915_gpu_panel_config *const panel_cfg,
 		uint8_t *const mmio, const unsigned int panel_idx)
 {
-	if (!blc->pwm_hz)
+	if (!panel_cfg->backlight_pwm_hz)
 		return;
 
-	const unsigned int pwm_period = 19200 * 1000 / blc->pwm_hz;
+	const unsigned int pwm_period = 19200 * 1000 / panel_cfg->backlight_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));
+		panel_cfg->backlight_polarity ? BXT_BLC_PWM_POLARITY : 0);
 
 	/* Second backlight control uses display utility pin. */
 	if (panel_idx == 1) {
@@ -68,9 +68,9 @@ void graphics_soc_panel_init(struct device *const dev)
 		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->panel_cfg); ++i)
+		graphics_configure_panelpower(&conf->panel_cfg[i], mmio, i);
 
-	for (i = 0; i < ARRAY_SIZE(conf->gpu_blc); ++i)
-		graphics_configure_backlight(&conf->gpu_blc[i], mmio, i);
+	for (i = 0; i < ARRAY_SIZE(conf->panel_cfg); ++i)
+		graphics_configure_backlight(&conf->panel_cfg[i], mmio, i);
 }