[XS] Change in coreboot[main]: soc/intel/common/gfx: Only generate a single SSDT entry for the GPU

[Matt DeVillier (Code Review)]

Matt DeVillier has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/80060?usp=email )

Change subject: soc/intel/common/gfx: Only generate a single SSDT entry for the GPU
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soc/intel/common/gfx: Only generate a single SSDT entry for the GPU

If a mainboard defines its display outputs using a generic graphics
chip driver, then don't generate the default SSDT for the iGPU, since
then there will be duplicate _DOD methods under the iGPU, which will
cause some OSes (read: Windows) to disable the ACPI brightness controls
for the internal panel.

TEST=tested with rest of patch train

Change-Id: If04d1df102c50b561911d7f842ad37b2dd3c6857
Signed-off-by: Matt DeVillier 
---
M src/soc/intel/common/block/graphics/graphics.c
1 file changed, 1 insertion(+), 1 deletion(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/60/80060/1

diff --git a/src/soc/intel/common/block/graphics/graphics.c b/src/soc/intel/common/block/graphics/graphics.c
index 9b780da..875fc24 100644
--- a/src/soc/intel/common/block/graphics/graphics.c
+++ b/src/soc/intel/common/block/graphics/graphics.c
@@ -176,7 +176,7 @@
 {
    const struct i915_gpu_controller_info *gfx = intel_igd_get_controller_info(device);

-	if (gfx)
+	if (gfx && !CONFIG(DRIVERS_GFX_GENERIC))
    	drivers_intel_gma_displays_ssdt_generate(gfx);
 }