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disp: msm: dp: reenable sink crc for robustness

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Some monitors seem to be not enabling Sink CRC capability on first plugin
and therefore the CRC read returns all zeros. But on subsequent plugins
the capability is set properly and CRC values are calculated. To
workaround this quirk on the sink side, this change reenables sink CRC
if the values are read as zeros.

Change-Id: I67ace5c064b2b56d03732a78f334ea6b1b649608
Signed-off-by: Rajkumar Subbiah <quic_rsubbia@quicinc.com>
This commit is contained in:
Rajkumar Subbiah
2023-02-22 18:22:33 -05:00
committed by Gerrit - the friendly Code Review server
parent 3564a2c6f2
commit 7ac494a18e
2 changed files with 16 additions and 11 deletions
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10
msm/dp/dp_debug.c
View File

@@ -402,8 +402,16 @@ static ssize_t dp_debug_read_crc(struct file *file, char __user *user_buff, size
panel = debug->panel;
}
panel->get_src_crc(panel, src_crc);
panel->get_sink_crc(panel, sink_crc);
if (!(sink_crc[0] + sink_crc[1] + sink_crc[2])) {
panel->sink_crc_enable(panel, true);
mutex_unlock(&debug->lock);
msleep(30);
mutex_lock(&debug->lock);
panel->get_sink_crc(panel, sink_crc);
}
panel->get_src_crc(panel, src_crc);
len += scnprintf(buf + len, buf_size - len, "FRAME_CRC:\nSource vs Sink\n");

17
msm/dp/dp_panel.c
View File

@@ -3113,18 +3113,15 @@ 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;
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_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);
DP_DEBUG("Enabled CRC: %x\n", buf);
}
drm_dp_dpcd_readb(drm_aux, DP_TEST_SINK, &buf);
return rc;
}