This is a note to let you know that I've just added the patch titled

drm/fsl-dcu: avoid disabling pixel clock twice on suspend

to the 4.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

The filename of the patch is: drm-fsl-dcu-avoid-disabling-pixel-clock-twice-on-suspend.patch and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.

From 9306e996574f7f57136a62e49cd0075f85713623 Mon Sep 17 00:00:00 2001

From: Stefan Agner stefan@agner.ch Date: Thu, 9 Nov 2017 15:39:56 +0100 Subject: drm/fsl-dcu: avoid disabling pixel clock twice on suspend

From: Stefan Agner stefan@agner.ch

commit 9306e996574f7f57136a62e49cd0075f85713623 upstream.

With commit 0a70c998d0c5 ("drm/fsl-dcu: enable pixel clock when enabling CRTC") the pixel clock is controlled by the CRTC code. Disabling the pixel clock in suspend leads to a warning due to the second clk_disable_unprepare call: WARNING: CPU: 0 PID: 359 at drivers/clk/clk.c:594 clk_core_disable+0x8c/0x90

Remove clk_disable_unprepare call for pixel clock to avoid unbalanced clock disable on suspend.

Fixes: 0a70c998d0c5 ("drm/fsl-dcu: enable pixel clock when enabling CRTC") Signed-off-by: Stefan Agner stefan@agner.ch Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org

--- drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c | 1 - 1 file changed, 1 deletion(-)

--- a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c +++ b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c @@ -243,7 +243,6 @@ static int fsl_dcu_drm_pm_suspend(struct return PTR_ERR(fsl_dev->state); }

- clk_disable_unprepare(fsl_dev->pix_clk); clk_disable_unprepare(fsl_dev->clk);

return 0;

Patches currently in stable-queue which might be from stefan@agner.ch are

queue-4.9/drm-fsl-dcu-avoid-disabling-pixel-clock-twice-on-suspend.patch queue-4.9/drm-fsl-dcu-enable-irq-before-drm_atomic_helper_resume.patch