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drm/amdgpu: Use DC by default on SI dGPUs

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Now that DC supports analog connectors, it has reached feature
parity with the legacy non-DC display driver on SI dGPUs.
Use the DC display driver by default on SI dGPUs, unless it is
explicitly disabled using the amdgpu.dc=0 module parameter.

DC brings proper support for DP/HDMI audio, DP MST,
10-bit colors, some HDR features, atomic modesetting, etc.

Also clarify the comment about what is missing to have full
DC support for CIK APUs.

Signed-off-by: Timur Kristóf <timur.kristof@gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Timur Kristóf
2025-11-09 19:26:40 +01:00
committed by Alex Deucher
parent 237d623ae6
commit 2da2e952a7
1 changed files with 2 additions and 13 deletions
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15
drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
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@@ -4249,24 +4249,13 @@ bool amdgpu_device_asic_has_dc_support(struct pci_dev *pdev,
case CHIP_PITCAIRN:
case CHIP_VERDE:
case CHIP_OLAND:
/*
* 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.
*/
#if defined(CONFIG_DRM_AMD_DC_SI)
return amdgpu_dc > 0;
#else
return false;
#endif
return amdgpu_dc != 0 && IS_ENABLED(CONFIG_DRM_AMD_DC_SI);
case CHIP_KAVERI:
case CHIP_KABINI:
case CHIP_MULLINS:
/*
* We have systems in the wild with these ASICs that require
* VGA support which is not supported with DC.
* TRAVIS and NUTMEG support which is not supported with DC.
*
* Fallback to the non-DC driver here by default so as not to
* cause regressions.