From mboxrd@z Thu Jan 1 00:00:00 1970 From: afaerber@suse.de (=?UTF-8?B?QW5kcmVhcyBGw6RyYmVy?=) Date: Tue, 31 Mar 2015 13:42:32 +0200 Subject: [RFT PATCHv2] drm/exynos: Enable DP clock to fix display on Exynos5250 and other In-Reply-To: <5515ADB6.6050204@collabora.co.uk> References: <1427472488-21454-1-git-send-email-k.kozlowski@samsung.com> <5515ADB6.6050204@collabora.co.uk> Message-ID: <551A8828.70108@suse.de> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Am 27.03.2015 um 20:21 schrieb Javier Martinez Canillas: > Hello Krzysztof, > > On 03/27/2015 05:08 PM, Krzysztof Kozlowski wrote: >> 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 >> Reported-by: Javier Martinez Canillas >> Fixes: 2d2c9a8d0a4f ("ARM: dts: add display power domain for exynos5250") >> Cc: >> >> --- >> >> This should fix issue reported by Javier [1][2]. >> > > I tested this patch and does indeed solves both issues I reported > The exynos-dp probe deferral does not make the display to not be > working and also disabling and enabling the display with: > > with /sys/devices/platform/exynos-drm/graphics/fb0/blank works. > > Thanks a lot for fixing this issue. > > On an Exynos5250 Snow Chromebook: > > Tested-by: Javier Martinez Canillas Seems to fix Spring Chromebook as well, Tested-by: Andreas F?rber Thanks a lot, Andreas -- SUSE Linux GmbH, Maxfeldstr. 5, 90409 N?rnberg, Germany GF: Felix Imend?rffer, Jane Smithard, Jennifer Guild, Dilip Upmanyu, Graham Norton; HRB 21284 (AG N?rnberg)