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drm/i915/display: Only query DP state of a DDI encoder

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Avoid a NULL dereference for a mismatched encoder type, hit when
probing state for all encoders.

This is a band aid to prevent the OOPS as the right fix is "probably to
swap the psr vs infoframes.enable checks, or outright disappear from
this function" (Ville).

Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/1892
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Acked-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200525124912.16019-1-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2020-05-25 13:49:12 +01:00
parent fc0e127022
commit 22da5d846d
1 changed files with 3 additions and 0 deletions
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3
drivers/gpu/drm/i915/display/intel_dp.c
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@ -5212,6 +5212,9 @@ void intel_read_dp_sdp(struct intel_encoder *encoder,
struct intel_crtc_state *crtc_state,
unsigned int type)
{
if (encoder->type != INTEL_OUTPUT_DDI)
return;
switch (type) {
case DP_SDP_VSC:
intel_read_dp_vsc_sdp(encoder, crtc_state,