Hi, On 01/14/2015 09:24 AM, Javier Martinez Canillas wrote: > 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 >> Did you execute this operation repeatedly? Still i get error when i execute this more than twice with your change [0]. Thanks. >> 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
 |