| commit | bda8eaa6dee7525f4dac950810a85a88bf6c2ba0 | [log] [tgz] |
|---|---|---|
| author | Chen-Yu Tsai <wens@csie.org> | Mon Jun 29 14:00:32 2020 +0800 |
| committer | Maxime Ripard <maxime@cerno.tech> | Tue Jun 30 10:01:48 2020 +0200 |
| tree | e7bb291d1405e515156a31ed70bd0093f19e4b7c | |
| parent | 4ab59c3c638c6c8952bf07739805d20eb6358a4d [diff] |
drm: sun4i: hdmi: Remove extra HPD polling The HPD sense mechanism in Allwinner's old HDMI encoder hardware is more or less an input-only GPIO. Other GPIO-based HPD implementations directly return the current state, instead of polling for a specific state and returning the other if that times out. Remove the I/O polling from sun4i_hdmi_connector_detect() and directly return a known state based on the current reading. This also gets rid of excessive CPU usage by kworker as reported on Stack Exchange [1] and Armbian forums [2]. [1] https://superuser.com/questions/1515001/debian-10-buster-on-cubietruck-with-bug-in-sun4i-drm-hdmi [2] https://forum.armbian.com/topic/14282-headless-systems-and-sun4i_drm_hdmi-a10a20/ Fixes: 9c5681011a0c ("drm/sun4i: Add HDMI support") Signed-off-by: Chen-Yu Tsai <wens@csie.org> Signed-off-by: Maxime Ripard <maxime@cerno.tech> Link: https://patchwork.freedesktop.org/patch/msgid/20200629060032.24134-1-wens@kernel.org