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Leah Rowe
2edd583aee
Courtesy of Kat Inskip who ported this board. Headphone output doesn't work at the moment, due to incorrect verb. Intel VBT is also wrong. Both are taken from another board. This will be amended later with the correct verb and VBT. Signed-off-by: Leah Rowe <leah@libreboot.org>
52 lines
1.6 KiB
Diff
52 lines
1.6 KiB
Diff
From df64f2825157226b98e002e746114e25b0047438 Mon Sep 17 00:00:00 2001
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From: Leah Rowe <info@minifree.org>
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Date: Sat, 6 Apr 2024 01:22:47 +0100
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Subject: [PATCH 13/48] nb/haswell: Fully disable iGPU when dGPU is used
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My earlier patch disabled decode *and* disabled the iGPU itself, but
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a subsequent revision disabled only VGA decode. Upon revisiting, I
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found that, actually, yes, you also need to disable the iGPU entirely.
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Tested on Dell 9020 SFF using broadwell MRC, with both iGPU and dGPU.
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With this patch, the iGPU is completely disabled when you install a
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graphics card, but the iGPU is available to use when no graphics card
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is present.
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For more context, see:
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Author: Leah Rowe <info@minifree.org>
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Date: Fri Feb 23 13:33:31 2024 +0000
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nb/haswell: Disable iGPU when dGPU is used
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And look at the Gerrit comments:
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https://review.coreboot.org/c/coreboot/+/80717/
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So, my original submission on change 80717 was actually correct.
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This patch fixes the issue. I tested on iGPU and dGPU, with both
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broadwell and haswell mrc.bin.
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Signed-off-by: Leah Rowe <info@minifree.org>
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---
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src/northbridge/intel/haswell/gma.c | 3 +++
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1 file changed, 3 insertions(+)
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diff --git a/src/northbridge/intel/haswell/gma.c b/src/northbridge/intel/haswell/gma.c
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index f7fad3183d..1b188e92e1 100644
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--- a/src/northbridge/intel/haswell/gma.c
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+++ b/src/northbridge/intel/haswell/gma.c
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@@ -466,6 +466,9 @@ static void gma_func0_disable(struct device *dev)
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{
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/* Disable VGA decode */
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pci_or_config16(pcidev_on_root(0, 0), GGC, 1 << 1);
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+
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+ /* Required or else the graphics card doesn't work */
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+ dev->enabled = 0;
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}
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static struct device_operations gma_func0_ops = {
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--
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2.47.3
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