soc/intel/gma: Move DDI-A 4-lane config to common code

Change-Id: I0572dbbfb61e5e0129fe6a3a1b5894145d74fd0d
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/40728
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/soc/intel/cannonlake/Kconfig

@@ -25,6 +25,7 @@ config SOC_INTEL_COFFEELAKE
 	select SOC_INTEL_CANNONLAKE_BASE
 	select FSP_USES_CB_STACK
 	select HAVE_INTEL_FSP_REPO
+	select SOC_INTEL_CONFIGURE_DDI_A_4_LANES
 	help
 	  Intel Coffeelake support
 
@@ -33,6 +34,7 @@ config SOC_INTEL_WHISKEYLAKE
 	select SOC_INTEL_CANNONLAKE_BASE
 	select FSP_USES_CB_STACK
 	select HAVE_INTEL_FSP_REPO
+	select SOC_INTEL_CONFIGURE_DDI_A_4_LANES
 	help
 	  Intel Whiskeylake support
 
@@ -41,6 +43,7 @@ config SOC_INTEL_COMETLAKE
 	select SOC_INTEL_CANNONLAKE_BASE
 	select FSP_USES_CB_STACK
 	select HAVE_INTEL_FSP_REPO
+	select SOC_INTEL_CONFIGURE_DDI_A_4_LANES
 	help
 	  Intel Cometlake support
 

src/soc/intel/cannonlake/graphics.c

@@ -11,20 +11,3 @@ uintptr_t fsp_soc_get_igd_bar(void)
 {
 	return graphics_get_memory_base();
 }
-
-void graphics_soc_init(struct device *dev)
-{
-	uint32_t ddi_buf_ctl;
-
-	/*
-	 * Enable DDI-A (eDP) 4-lane operation if the link is not up yet.
-	 * This will allow the kernel to use 4-lane eDP links properly
-	 * if the VBIOS or GOP driver do not execute.
-	 */
-	ddi_buf_ctl = graphics_gtt_read(DDI_BUF_CTL_A);
-	if (!acpi_is_wakeup_s3() && !(ddi_buf_ctl & DDI_BUF_CTL_ENABLE)) {
-		ddi_buf_ctl |= (DDI_A_4_LANES | DDI_INIT_DISPLAY_DETECTED |
-				DDI_BUF_IS_IDLE);
-		graphics_gtt_write(DDI_BUF_CTL_A, ddi_buf_ctl);
-	}
-}

src/soc/intel/common/block/graphics/Kconfig

@@ -2,3 +2,8 @@ config SOC_INTEL_COMMON_BLOCK_GRAPHICS
 	bool
 	help
 	  Intel Processor common Graphics support
+
+config SOC_INTEL_CONFIGURE_DDI_A_4_LANES
+	bool
+	help
+	  Selected by platforms that require DDI-A bifurcation setup.

src/soc/intel/common/block/graphics/graphics.c

@@ -1,5 +1,6 @@
 /* SPDX-License-Identifier: GPL-2.0-or-later */
 
+#include <acpi/acpi.h>
 #include <assert.h>
 #include <bootmode.h>
 #include <console/console.h>
@@ -34,6 +35,13 @@ static void gma_init(struct device *const dev)
 	/* SoC specific configuration. */
 	graphics_soc_init(dev);
 
+	if (CONFIG(SOC_INTEL_CONFIGURE_DDI_A_4_LANES) && !acpi_is_wakeup_s3()) {
+		const u32 ddi_buf_ctl = graphics_gtt_read(DDI_BUF_CTL_A);
+		/* Only program if the buffer is not enabled yet. */
+		if (!(ddi_buf_ctl & DDI_BUF_CTL_ENABLE))
+			graphics_gtt_write(DDI_BUF_CTL_A, ddi_buf_ctl | DDI_A_4_LANES);
+	}
+
 	/*
 	 * GFX PEIM module inside FSP binary is taking care of graphics
 	 * initialization based on RUN_FSP_GOP Kconfig option and input

src/soc/intel/skylake/Kconfig

@@ -74,6 +74,7 @@ config CPU_SPECIFIC_OPTIONS
 	select SOC_INTEL_COMMON_NHLT
 	select SOC_INTEL_COMMON_RESET
 	select SOC_INTEL_COMMON_BLOCK_POWER_LIMIT
+	select SOC_INTEL_CONFIGURE_DDI_A_4_LANES
 	select SSE2
 	select SUPPORT_CPU_UCODE_IN_CBFS
 	select TSC_MONOTONIC_TIMER

src/soc/intel/skylake/graphics.c

@@ -1,6 +1,5 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 
-#include <acpi/acpi.h>
 #include <commonlib/helpers.h>
 #include <console/console.h>
 #include <device/mmio.h>
@@ -16,7 +15,7 @@ uintptr_t fsp_soc_get_igd_bar(void)
 	return graphics_get_memory_base();
 }
 
-static void graphics_setup_panel(struct device *dev)
+void graphics_soc_init(struct device *dev)
 {
 	struct soc_intel_skylake_config *conf = config_of(dev);
 	struct resource *mmio_res;
@@ -76,24 +75,6 @@ static void graphics_setup_panel(struct device *dev)
 	}
 }
 
-void graphics_soc_init(struct device *dev)
-{
-	u32 ddi_buf_ctl;
-
-	graphics_setup_panel(dev);
-
-	/*
-	 * Enable DDI-A (eDP) 4-lane operation if the link is not up yet.
-	 * This will allow the kernel to use 4-lane eDP links properly
-	 * if the VBIOS or GOP driver does not execute.
-	 */
-	ddi_buf_ctl = graphics_gtt_read(DDI_BUF_CTL_A);
-	if (!acpi_is_wakeup_s3() && !(ddi_buf_ctl & DDI_BUF_CTL_ENABLE)) {
-		ddi_buf_ctl |= DDI_A_4_LANES;
-		graphics_gtt_write(DDI_BUF_CTL_A, ddi_buf_ctl);
-	}
-}
-
 const struct i915_gpu_controller_info *
 intel_igd_get_controller_info(const struct device *device)
 {