On piÄ , 2014-11-14 at 11:53 +0900, Inki Dae wrote: > On 2014ë 11ì 07ì¼ 22:53, Krzysztof Kozlowski wrote: > > Add runtime Power Management to the Exynos DSI driver so the LCD power > > domain could be turned off. > > > > This slightly reduces the energy consumption when screen is completely > > turned off. On Trats2 board when the system was idle the energy > > consumption dropped by 1% (from 92.2 mA to 91.1 mA). > > > > Before the patch: > > $ cat cat /sys/kernel/debug/pm_genpd/pm_genpd_summary > > lcd0-power-domain on > > /devices/11c00000.fimd suspended > > /devices/11c80000.dsi unsupported > > > > After applying the patch: > > lcd0-power-domain off > > /devices/11c00000.fimd suspended > > /devices/11c80000.dsi suspended > > Reasonable but this patch incurs page flip test timeout like below, > # modetest -v -s 15 at 12:720x1280 > trying to open device 'i915'...failed. > trying to open device 'radeon'...failed. > trying to open device 'nouveau'...failed. > trying to open device 'vmwgfx'...failed. > trying to open device 'omapdrm'...failed. > trying to open device 'exynos'...success. > setting mode 720x1280-0Hz at XR24 on connectors 15, crtc 12 > select timed out or error (ret 0) > > I'm not sure why this issue is incurred with this patch even through > this patch is reasonable and correct. So we need more checking. > > P.S. I tested it on exynos-drm-next and m0 board.
Thanks for pointing this issue. I'll investigate it. Best regards, Krzysztof
