[PATCH 4.9 197/207] drm/amdgpu: fix set scaling mode Full/Full aspect/Center not works on vga and dvi connectors

Greg Kroah-Hartman
2021-11-24T12:30:03Z

From: hongao <hongao@uniontech.com>

commit bf552083916a7f8800477b5986940d1c9a31b953 upstream.

amdgpu_connector_vga_get_modes missed function amdgpu_get_native_mode
which assign amdgpu_encoder->native_mode with *preferred_mode result in
amdgpu_encoder->native_mode.clock always be 0. That will cause
amdgpu_connector_set_property returned early on:
if ((rmx_type != DRM_MODE_SCALE_NONE) &&
(amdgpu_encoder->native_mode.clock == 0))
when we try to set scaling mode Full/Full aspect/Center.
Add the missing function to amdgpu_connector_vga_get_mode can fix this.
It also works on dvi connectors because
amdgpu_connector_dvi_helper_funcs.get_mode use the same method.

Signed-off-by: hongao <hongao@uniontech.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_connectors.c | 1 +
1 file changed, 1 insertion(+)

--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_connectors.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_connectors.c
@@ -844,6 +844,7 @@ static int amdgpu_connector_vga_get_mode

amdgpu_connector_get_edid(connector);
ret = amdgpu_connector_ddc_get_modes(connector);
+ amdgpu_get_native_mode(connector);

return ret;
}