Hello Joonyoung,
On 01/20/2015 12:12 PM, Joonyoung Shim wrote:
I dug further on this issue and found that the cause is that the exynos_mixer driver needs some clocks (CLK_HDMI and CLK_SCLK_HDMI) grabbed by exynos_hdmi to be kept enabled after hdmi_poweroff (drivers/gpu/drm/exynos/exynos_hdmi.c).
Otherwise, any access to mixer device registers leads to an imprecise external abort error. The following change [0] to the Exynos DRM HDMI driver makes the issue to not happen and I can successfully execute:
# echo 1 > /sys/devices/platform/exynos-drm/graphics/fb0/blank # echo 0 > /sys/devices/platform/exynos-drm/graphics/fb0/blank
Did you execute this operation repeatedly? Still i get error when i execute this more than twice with your change [0].
You mean that you are seeing the "Power domain power-domain disable failed" message but the system is not crashing or that you are still having the system crash?
I've seen the former when running multiple times but I have not seen the crash when the hdmi clock is not disabled on hdmi_poweroff().
Thanks.
Best regards, Javier