drm/i915/dp: Add a meaningful return to intel_dp_read_dsc_dpcd

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Add a meaningful return to intel_dp_read_dsc_dpcd. This is to avoid
unwanted DPCD reads which are not needed once we know DSC DPCD
read fails. To do this convert drm_dp_dpcd_read to drm_dp_dpcd_read_data
which returns a meaningful error which can be propogated up when all
bits are not read.
While we are at it convert the drm_err in intel_dp_read_dsc_dpcd to
drm_dbg_kms. This is because we do not want a hard ERROR when we
call this function, during the intel_dp_detect phase since AUX may not
be up, it is expected to fail but we do not expect a failure in read
when we call intel_dp_dsc_get_sink_cap so we move the drm_err there.

Signed-off-by: Suraj Kandpal <suraj.kandpal@intel.com>
Reviewed-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Link: https://patch.msgid.link/20260202081801.1400708-1-suraj.kandpal@intel.com

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Suraj Kandpal 2026-02-02 13:48:02 +05:30

parent c0dc68f4e2

commit c766952016

1 changed files with 19 additions and 12 deletions

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drivers/gpu/drm/i915/display/intel_dp.c

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