| 12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455 |
- From c6ce9c635e6576c86c546177c3d770dec2f3c9ae Mon Sep 17 00:00:00 2001
- From: Leah Rowe <info@minifree.org>
- Date: Fri, 23 Feb 2024 13:33:31 +0000
- Subject: [PATCH 1/1] nb/haswell: Disable iGPU when dGPU is used
- This is usually is handled by Haswell mrc.bin, disabling VGA
- decode on the iGPU when a dGPU is installed. However, Broadwell
- mrc.bin does not, so the iGPU and dGPU are both enabled.
- This patch disables legacy VGA cycles for iGPU, under such
- conditions. It has been tested on Broadwell mrc.bin when
- using a graphics card on Dell OptiPlex 9020 SFF (currently
- under review at this time of writing, submitted by Mate
- Kukri).
- This patch has also been tested when Haswell mrc.bin is used,
- and there are seemingly no breaking changes caused by it.
- Change-Id: I1df0a3aa42f8475b7741007bf3e28c2e089d916b
- Signed-off-by: Leah Rowe <info@minifree.org>
- Reviewed-on: https://review.coreboot.org/c/coreboot/+/80717
- Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
- Reviewed-by: Nico Huber <nico.h@gmx.de>
- ---
- src/northbridge/intel/haswell/gma.c | 7 +++++++
- 1 file changed, 7 insertions(+)
- diff --git a/src/northbridge/intel/haswell/gma.c b/src/northbridge/intel/haswell/gma.c
- index 6e6948b70f..48a0ba54c7 100644
- --- a/src/northbridge/intel/haswell/gma.c
- +++ b/src/northbridge/intel/haswell/gma.c
- @@ -461,12 +461,19 @@ static void gma_generate_ssdt(const struct device *dev)
- drivers_intel_gma_displays_ssdt_generate(&chip->gfx);
- }
-
- +static void gma_func0_disable(struct device *dev)
- +{
- + /* Disable VGA decode */
- + pci_or_config16(pcidev_on_root(0, 0), GGC, 1 << 1);
- +}
- +
- static struct device_operations gma_func0_ops = {
- .read_resources = pci_dev_read_resources,
- .set_resources = pci_dev_set_resources,
- .enable_resources = pci_dev_enable_resources,
- .init = gma_func0_init,
- .acpi_fill_ssdt = gma_generate_ssdt,
- + .vga_disable = gma_func0_disable,
- .ops_pci = &pci_dev_ops_pci,
- };
-
- --
- 2.39.2
|
