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Currently return value of drm_dpcd_readb is not checked when reading sink Panel Replay Selective Update capabilities. Fix this and switch to drm_dpcd_read_byte. Signed-off-by: Jouni Högander <jouni.hogander@intel.com> Reviewed-by: Mika Kahola <mika.kahola@intel.com> Reviewed-by: Michał Grzelak <michal.grzelak@intel.com> Link: https://lore.kernel.org/r/20250827060809.2461725-1-jouni.hogander@intel.com