[RFT PATCH] drm/exynos: Enable DP clock to fix display on Exynos5250 and other

[Krzysztof Kozlowski]

2015-04-30 2:31 GMT+09:00 Kevin Hilman <khilman at kernel.org>:
> Krzysztof Kozlowski <k.kozlowski at samsung.com> writes:
>
>> After adding display power domain for Exynos5250 in commit
>> 2d2c9a8d0a4f ("ARM: dts: add display power domain for exynos5250") the
>> display on Chromebook Snow and others stopped working after boot.
>>
>> The reason for this suggested Andrzej Hajda: the DP clock was disabled.
>> This clock is required by Display Port and is enabled by bootloader.
>> However when FIMD driver probing was deferred, the display power domain
>> was turned off. This effectively reset the value of DP clock enable
>> register.
>>
>> When exynos-dp is later probed, the clock is not enabled and display is
>> not properly configured:
>>
>> exynos-dp 145b0000.dp-controller: Timeout of video streamclk ok
>> exynos-dp 145b0000.dp-controller: unable to config video
>>
>> Signed-off-by: Krzysztof Kozlowski <k.kozlowski at samsung.com>
>> Reported-by: Javier Martinez Canillas <javier.martinez at collabora.co.uk>
>> Fixes: 2d2c9a8d0a4f ("ARM: dts: add display power domain for exynos5250")
>> Cc: <stable at vger.kernel.org>
>>
>> ---
>>
>> This should fix issue reported by Javier [1][2].
>>
>> Tested on Chromebook Snow (Exynos 5250). More testing would be great,
>> especially on other Exynos 5xxx products.
>
> I hoped to try this on my exynos5 boards, but it doesn't seem to apply
> to linux-next or to Linus' master branch.
>
> Are there some other dependencies here?

It is already applied:
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=1c363c7cccf64128087002b0779986ad16aff6dc

Best regards,
Krzysztof