diff options
Diffstat (limited to 'common/recipes-kernel/linux/linux-yocto-4.14.71/4698-drm-amdgpu-Don-t-default-to-DC-support-for-Kaveri-an.patch')
| -rw-r--r-- | common/recipes-kernel/linux/linux-yocto-4.14.71/4698-drm-amdgpu-Don-t-default-to-DC-support-for-Kaveri-an.patch | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/common/recipes-kernel/linux/linux-yocto-4.14.71/4698-drm-amdgpu-Don-t-default-to-DC-support-for-Kaveri-an.patch b/common/recipes-kernel/linux/linux-yocto-4.14.71/4698-drm-amdgpu-Don-t-default-to-DC-support-for-Kaveri-an.patch new file mode 100644 index 00000000..35450686 --- /dev/null +++ b/common/recipes-kernel/linux/linux-yocto-4.14.71/4698-drm-amdgpu-Don-t-default-to-DC-support-for-Kaveri-an.patch @@ -0,0 +1,60 @@ +From 324e4e833783474043fdc2cd1671d421399ec0cf Mon Sep 17 00:00:00 2001 +From: Harry Wentland <harry.wentland@amd.com> +Date: Tue, 8 May 2018 11:33:42 -0400 +Subject: [PATCH 4698/5725] drm/amdgpu: Don't default to DC support for Kaveri + and older + +We've had a number of users report failures to detect and light up +display with DC with LVDS and VGA. These connector types are not +currently supported with DC. I'd like to add support but unfortunately +don't have a system with LVDS or VGA available. + +In order not to cause regressions we should probably fallback to the +non-DC driver for ASICs that support VGA and LVDS. + +These ASICs are: + * Bonaire + * Kabini + * Kaveri + * Mullins + +ASIC support can always be force enabled with amdgpu.dc=1 + +v2: Keep Hawaii on DC +v3: Added Mullins to the list + +Cc: stable@vger.kernel.org +Signed-off-by: Harry Wentland <harry.wentland@amd.com> +Reviewed-by: Alex Deucher <alexander.deucher@amd.com> +Signed-off-by: Alex Deucher <alexander.deucher@amd.com> +--- + drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 10 +++++++++- + 1 file changed, 9 insertions(+), 1 deletion(-) + +diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c +index b39192f..3d23d8b 100644 +--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c ++++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c +@@ -2207,10 +2207,18 @@ bool amdgpu_device_asic_has_dc_support(enum amd_asic_type asic_type) + switch (asic_type) { + #if defined(CONFIG_DRM_AMD_DC) + case CHIP_BONAIRE: +- case CHIP_HAWAII: + case CHIP_KAVERI: + case CHIP_KABINI: + case CHIP_MULLINS: ++ /* ++ * We have systems in the wild with these ASICs that require ++ * LVDS and VGA support which is not supported with DC. ++ * ++ * Fallback to the non-DC driver here by default so as not to ++ * cause regressions. ++ */ ++ return amdgpu_dc > 0; ++ case CHIP_HAWAII: + case CHIP_CARRIZO: + case CHIP_STONEY: + case CHIP_POLARIS10: +-- +2.7.4 + |