drm/exynos/fimc: fix runtime pm support

This change “drm/exynos/fimc: fix runtime pm support” in Linux kernel is authored by Marek Szyprowski <m.szyprowski [at] samsung.com> on Thu Apr 9 10:46:00 2015 +0200.

drm/exynos/fimc: fix runtime pm support

Once pm_runtime_set_active() gets called, the kernel assumes that given
device has already enabled runtime pm and will call pm_runtime_suspend()
without matching pm_runtime_resume(). In case of DRM FIMC IPP driver,
this will result in calling clk_disable() without respective call to
clk_enable(). This patch removes call to pm_runtime_set_active() to
ensure that pm_runtime_suspend/resume calls will match.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>

This Linux change may have been applied to various maintained Linux releases and you can find Linux releases including commit 9992349.

There is one line of Linux source code added/deleted in this change. Code changes to Linux kernel are as follows.

 drivers/gpu/drm/exynos/exynos_drm_fimc.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/gpu/drm/exynos/exynos_drm_fimc.c b/drivers/gpu/drm/exynos/exynos_drm_fimc.c
index 842d6b8..2a65235 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_fimc.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_fimc.c
@@ -1745,7 +1745,6 @@ static int fimc_probe(struct platform_device *pdev)
 	spin_lock_init(&ctx->lock);
 	platform_set_drvdata(pdev, ctx);
 
-	pm_runtime_set_active(dev);
 	pm_runtime_enable(dev);
 
 	ret = exynos_drm_ippdrv_register(ippdrv);

The commit for this change in Linux stable tree is 9992349 (patch).

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