linux-kernel - [PATCH 4.9 003/109] drm/fsl-dcu: avoid disabling pixel clock twice on suspend

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Message-Id: <20171207125634.998055429@linuxfoundation.org>
Date:   Thu,  7 Dec 2017 13:55:47 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Stefan Agner <stefan@...er.ch>
Subject: [PATCH 4.9 003/109] drm/fsl-dcu: avoid disabling pixel clock twice on suspend

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Stefan Agner <stefan@...er.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@...er.ch>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.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;