Hi,
On Mon, Jun 29, 2020 at 02:00:32PM +0800, Chen-Yu Tsai wrote:
From: Chen-Yu Tsai wens@csie.org
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-... [2] https://forum.armbian.com/topic/14282-headless-systems-and-sun4i_drm_hdmi-a1...
Fixes: 9c5681011a0c ("drm/sun4i: Add HDMI support") Signed-off-by: Chen-Yu Tsai wens@csie.org
Applied, thanks for figuring that out
Maxime