diff options
| author | Leah Rowe <leah@libreboot.org> | 2024-02-22 17:56:53 +0000 |
|---|---|---|
| committer | Leah Rowe <leah@libreboot.org> | 2024-02-22 17:56:53 +0000 |
| commit | 41ccbb21966d1ccf4dcba9239e2e3debf1fcbc60 (patch) | |
| tree | 971c384cce617610f99683ec8a12493fbb85c6ac | |
| parent | c64950d0b8cdf0cb973a6add98d6bb2a631e529f (diff) | |
haswell: disable igpu when dgpu is used9020vga
normally, haswell mrc.bin handles this, if hide-peg-from-mrc
is disabled, broadwell mrc allows use of both gpus - so i had
to disable it in coreboot, using the normal method in gma.c
Signed-off-by: Leah Rowe <leah@libreboot.org>
| -rw-r--r-- | config/coreboot/default/patches/0036-nb-haswell-disable-igpu-when-dgpu-is-used.patch | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/config/coreboot/default/patches/0036-nb-haswell-disable-igpu-when-dgpu-is-used.patch b/config/coreboot/default/patches/0036-nb-haswell-disable-igpu-when-dgpu-is-used.patch new file mode 100644 index 0000000..34d5d8b --- /dev/null +++ b/config/coreboot/default/patches/0036-nb-haswell-disable-igpu-when-dgpu-is-used.patch @@ -0,0 +1,47 @@ +From aa04e2b9f63aae953040816306a45bdf86a2195f Mon Sep 17 00:00:00 2001 +From: Leah Rowe <info@minifree.org> +Date: Thu, 22 Feb 2024 17:52:03 +0000 +Subject: [PATCH 1/1] nb/haswell: disable igpu when dgpu is used + +normally, this is done with haswell mrc, which handles +that, but when using broadwell, the igpu is not disabled, +and legacy vga cycles are not routed to the dgpu + +add this behaviour in gma.g for broadwell mrc.bin + +tested on dell optiplex 9020 sff + +Signed-off-by: Leah Rowe <info@minifree.org> +--- + src/northbridge/intel/haswell/gma.c | 9 +++++++++ + 1 file changed, 9 insertions(+) + +diff --git a/src/northbridge/intel/haswell/gma.c b/src/northbridge/intel/haswell/gma.c +index 6e6948b70f..ee4d321261 100644 +--- a/src/northbridge/intel/haswell/gma.c ++++ b/src/northbridge/intel/haswell/gma.c +@@ -461,12 +461,21 @@ 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); ++ ++ dev->enabled = 0; ++} ++ + 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 + |