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).