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drm/amd/display: Add disconnect case on dongle check

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[why]
In the case of an external monitor disconnection,
the kernel mode will attempt to post new timing
validation with two path counts (eDP + external
monitor removed to virtual).

[how]
Skip validating color depth and pixel encoding in the
scenario involving a DP to HDMI active converter dongle.

Reviewed-by: Wenjing Liu <wenjing.liu@amd.com>
Signed-off-by: Jingwen Zhu <Jingwen.Zhu@amd.com>
Signed-off-by: Wayne Lin <wayne.lin@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Jingwen Zhu 2025-05-08 11:19:49 +08:00 committed by Alex Deucher
parent deb24e64c8
commit 35b74eccf8
1 changed files with 8 additions and 0 deletions
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8
drivers/gpu/drm/amd/display/dc/link/link_validation.c
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@ -86,6 +86,10 @@ static bool dp_active_dongle_validate_timing(
if (!dongle_caps->is_dp_hdmi_ycbcr420_pass_through)
return false;
break;
case PIXEL_ENCODING_UNDEFINED:
/* These color depths are currently not supported */
ASSERT(false);
break;
default:
/* Invalid Pixel Encoding*/
return false;
@ -104,6 +108,10 @@ static bool dp_active_dongle_validate_timing(
if (dongle_caps->dp_hdmi_max_bpc < 12)
return false;
break;
case COLOR_DEPTH_UNDEFINED:
/* These color depths are currently not supported */
ASSERT(false);
break;
case COLOR_DEPTH_141414:
case COLOR_DEPTH_161616:
default: