Hi,
On Wed, Jul 14, 2021 at 9:34 AM Douglas Anderson dianders@chromium.org wrote:
When I tried booting up a device that needed the DP AUX backlight, I found an error in the logs: panel-simple-dp-aux: probe of aux-ti_sn65dsi86.aux.0 failed with error -110
The aux transfers were failing because the panel wasn't powered. Just like when reading the EDID we need to power the panel when trying to talk to it. Add the needed pm_runtime calls.
After I do this I can successfully probe the panel and adjust the backlight on my board.
Fixes: bfd451403d70 ("drm/panel-simple: Support DP AUX backlight") Signed-off-by: Douglas Anderson dianders@chromium.org
drivers/gpu/drm/panel/panel-simple.c | 3 +++ 1 file changed, 3 insertions(+)
Pushed with Lyude's review to drm-misc-next:
5ead9b5b1575 drm/panel-simple: Power the panel when probing DP AUX backlight