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 _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu
