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disp: msm: dp: check capability before enabling crc

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This is a partial revert of I67ace5c064b2b56d03732a78f334ea6b1b649608 which tries
to enable Sink CRC irrespective of the sink's CRC capability to workaround an
issue with a specific sinks which reports incorrect capability on first plugin.
But this causes some MST dongles to misbehave causing one or both outputs to
be blank.

Change-Id: I70c70db8ac371fe0094a45780216a2518d688a36
Signed-off-by: Rajkumar Subbiah <quic_rsubbia@quicinc.com>
This commit is contained in:
Rajkumar Subbiah
2023-03-18 16:33:42 -04:00
parent 3d940aa3e1
commit 4effde5930
1 changed files with 9 additions and 7 deletions
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16
msm/dp/dp_panel.c
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@@ -3113,15 +3113,17 @@ int dp_panel_sink_crc_enable(struct dp_panel *dp_panel, bool enable)
panel = container_of(dp_panel, struct dp_panel_private, dp_panel);
drm_aux = panel->aux->drm_aux;
ret = drm_dp_dpcd_readb(drm_aux, DP_TEST_SINK, &buf);
if (ret < 0)
return ret;
if (dp_panel->link_info.capabilities & DP_LINK_CAP_CRC) {
ret = drm_dp_dpcd_readb(drm_aux, DP_TEST_SINK, &buf);
if (ret < 0)
return ret;
ret = drm_dp_dpcd_writeb(drm_aux, DP_TEST_SINK, buf | DP_TEST_SINK_START);
if (ret < 0)
return ret;
ret = drm_dp_dpcd_writeb(drm_aux, DP_TEST_SINK, buf | DP_TEST_SINK_START);
if (ret < 0)
return ret;
drm_dp_dpcd_readb(drm_aux, DP_TEST_SINK, &buf);
drm_dp_dpcd_readb(drm_aux, DP_TEST_SINK, &buf);
}
return rc;
}