4.17-stable review patch. If anyone has any objections, please let me know.
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From: Harry Wentland harry.wentland@amd.com
commit d9fda248046ac035f18a6e663f2f9245b4bf9470 upstream.
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 Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-)
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c @@ -2080,10 +2080,18 @@ bool amdgpu_device_asic_has_dc_support(e 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_POLARIS11: