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drm/stm: ltdc: fix deferred endpoint management 

When a driver related to one of the endpoints is deferred
due to probe dependencies (i2c, spi...) but the other one
is ready, ltdc probe continues and the deferred driver
will never be probed again.

The fix consists in waiting for all deferred endpoints before
continuing the ltdc probe.

Signed-off-by: Philippe Cornu <philippe.cornu@st.com>
Reviewed-by: Yannick Fertré <yannick.fertre@st.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180417113441.8214-1-philippe.cornu@st.com
This commit is contained in:
Philippe CORNU 2018-04-17 13:34:41 +02:00 committed by Philippe Cornu
parent cc4e44d515
commit c2af73645d
1 changed files with 5 additions and 6 deletions
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11
drivers/gpu/drm/stm/ltdc.c
View File

@ -987,14 +987,13 @@ int ltdc_load(struct drm_device *ddev)
&bridge[i]);
/*
* If at least one endpoint is ready, continue probing,
* else if at least one endpoint is -EPROBE_DEFER and
* there is no previous ready endpoints, defer probing.
* If at least one endpoint is -EPROBE_DEFER, defer probing,
* else if at least one endpoint is ready, continue probing.
*/
if (!ret)
if (ret == -EPROBE_DEFER)
return ret;
else if (!ret)
endpoint_not_ready = 0;
else if (ret == -EPROBE_DEFER && endpoint_not_ready)
endpoint_not_ready = -EPROBE_DEFER;
}
if (endpoint_not_ready)