On 01/14/2015 01:19 AM, Javier Martinez Canillas 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 > > Only not disabling the hdmi clock [1]: is enough but doing so makes sometimes the > DISP1 power domain disabling fails. It doesn't seem to have side effect though > since I also see the signal in the HDMI display to go standby and then on again. > > # echo 0 > /sys/devices/platform/exynos-drm/graphics/fb0/blank > # echo 1 > /sys/devices/platform/exynos-drm/graphics/fb0/blank > [ 63.089080] Power domain disp1-power-domain disable failed > # echo 0 > /sys/devices/platform/exynos-drm/graphics/fb0/blank > # > > That error message when both clocks are not disabled on hdmi_poweroff() though. > This should be: "That error message is not shown when both clocks are disabled". Best regards, Javier -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
 |