Hello, On 2014-07-01 10:52, Tobias Jakobi wrote:
Hello Marek, I think you had a similar patch in the tizen tree, but according to Tomasz Figa, it was considered a hack. I don't quite see how this is different. Also, if I have been following the discussion correctly, then the powerdomain issue essentially is about the question which SoC block needs the LCD0 domain and how the proper power on/off sequences should look like. At least the mixer power issue, which I pointed out some time ago, seems to be deal with now: https://git.kernel.org/cgit/linux/kernel/git/daeinki/drm-exynos.git/commit/?h=exynos-drm-next&id=381be025ac1a6dc8efebdf146ced0d4a6007f77b
Well, that patch solves power on/off sequence issue with mixer and hdmi, but it didn't solve the issue with additional managing of power domain on/off. You can check that if you remove always on property, system will freeze when hdmi cable is connected for the second time. I've investigated it for some time, but right now I didn't find any 100% reliable solution other than keeping the power domain enabled all the time. At least for now, this patch lets you use HDMI without any stability issues. I've only found that there are still at least 2 issues with power domains. One is Mixer/Video Processor dependency on LCD0 domain, second is the proper power on/off sequence of HDMI/Mixer and TV domain. Forcing both domains to 'always on' workarounds both issues for now. Right now I have no better idea. Later, once the proper sequence is found we can remove those properties from Odroid DTS. Best regards -- Marek Szyprowski, PhD Samsung R&D Institute Poland -- 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
