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;a=summary
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@xxxxxxxxxxxxxxx> know about it.
>From 9306e996574f7f57136a62e49cd0075f85713623 Mon Sep 17 00:00:00 2001
From: Stefan Agner <stefan@xxxxxxxx>
Date: Thu, 9 Nov 2017 15:39:56 +0100
Subject: drm/fsl-dcu: avoid disabling pixel clock twice on suspend
From: Stefan Agner <stefan@xxxxxxxx>
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@xxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
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@xxxxxxxx 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