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drm/i915/sdvo: Issue SetTargetOutput prior to GetAttachedDisplays

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I have at least one SDVO device (some Lenovo DVI-I ADD2 card,
based on Conexant CX25904) where GetAttachedDisplays returns
success but fails to report any attached displays unless we
precede the command with a SetTargetOutput. Make it so.

I wasn't able to spot anything in the SDVO spec stating that
this should be necessary, but real world wins over spec.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230705202122.17915-2-ville.syrjala@linux.intel.com
Acked-by: Jani Nikula <jani.nikula@intel.com>
This commit is contained in:
Ville Syrjälä
2023-07-05 23:21:10 +03:00
parent 40a54a268f
commit 1d6f7b19bd
1 changed files with 4 additions and 0 deletions
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4
drivers/gpu/drm/i915/display/intel_sdvo.c
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@@ -2135,6 +2135,10 @@ intel_sdvo_detect(struct drm_connector *connector, bool force)
if (!INTEL_DISPLAY_ENABLED(i915))
return connector_status_disconnected;
if (!intel_sdvo_set_target_output(intel_sdvo,
intel_sdvo_connector->output_flag))
return connector_status_unknown;
if (!intel_sdvo_get_value(intel_sdvo,
SDVO_CMD_GET_ATTACHED_DISPLAYS,
&response, 2))