linux-kernel - [PATCH 3/3] drm/fsl-dcu: enable pixel clock when enabling CRTC

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Message-Id: <20161005005805.28644-3-stefan@agner.ch>
Date:   Tue,  4 Oct 2016 17:58:05 -0700
From:   Stefan Agner <stefan@...er.ch>
To:     meng.yi@....com, dri-devel@...ts.freedesktop.org
Cc:     alison.wang@...escale.com, jianwei.wang.chn@...il.com,
        linux-kernel@...r.kernel.org, Stefan Agner <stefan@...er.ch>
Subject: [PATCH 3/3] drm/fsl-dcu: enable pixel clock when enabling CRTC

The pixel clock should not be on if the CRTC is not in use, hence
move clock enable/disable calls into CRTC callbacks.

Signed-off-by: Stefan Agner <stefan@...er.ch>
---
 drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_crtc.c |  7 +++++++
 drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c  | 16 +---------------
 2 files changed, 8 insertions(+), 15 deletions(-)

diff --git a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_crtc.c b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_crtc.c
index 3371635..4fe0403 100644
--- a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_crtc.c
+++ b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_crtc.c
@@ -51,13 +51,20 @@ static void fsl_dcu_drm_disable_crtc(struct drm_crtc *crtc)
 			   DCU_MODE_DCU_MODE(DCU_MODE_OFF));
 	regmap_write(fsl_dev->regmap, DCU_UPDATE_MODE,
 		     DCU_UPDATE_MODE_READREG);
+	clk_disable_unprepare(fsl_dev->pix_clk);
 }
 
 static void fsl_dcu_drm_crtc_enable(struct drm_crtc *crtc)
 {
 	struct drm_device *dev = crtc->dev;
 	struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
+	int ret;
 
+	ret = clk_prepare_enable(fsl_dev->pix_clk);
+	if (ret < 0) {
+		dev_err(fsl_dev->dev, "failed to enable pix clk\n");
+		return;
+	}
 	regmap_update_bits(fsl_dev->regmap, DCU_DCU_MODE,
 			   DCU_MODE_DCU_MODE_MASK,
 			   DCU_MODE_DCU_MODE(DCU_MODE_NORMAL));
diff --git a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c
index 0884c45..a6863f9 100644
--- a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c
+++ b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c
@@ -267,12 +267,6 @@ static int fsl_dcu_drm_pm_resume(struct device *dev)
 		return ret;
 	}
 
-	ret = clk_prepare_enable(fsl_dev->pix_clk);
-	if (ret < 0) {
-		dev_err(dev, "failed to enable pix clk\n");
-		goto disable_dcu_clk;
-	}
-
 	fsl_dcu_drm_init_planes(fsl_dev->drm);
 	drm_atomic_helper_resume(fsl_dev->drm, fsl_dev->state);
 
@@ -401,18 +395,12 @@ static int fsl_dcu_drm_probe(struct platform_device *pdev)
 		goto disable_clk;
 	}
 
-	ret = clk_prepare_enable(fsl_dev->pix_clk);
-	if (ret < 0) {
-		dev_err(dev, "failed to enable pix clk\n");
-		goto unregister_pix_clk;
-	}
-
 	fsl_dev->tcon = fsl_tcon_init(dev);
 
 	drm = drm_dev_alloc(driver, dev);
 	if (IS_ERR(drm)) {
 		ret = PTR_ERR(drm);
-		goto disable_pix_clk;
+		goto unregister_pix_clk;
 	}
 
 	fsl_dev->dev = dev;
@@ -433,8 +421,6 @@ static int fsl_dcu_drm_probe(struct platform_device *pdev)
 
 unref:
 	drm_dev_unref(drm);
-disable_pix_clk:
-	clk_disable_unprepare(fsl_dev->pix_clk);
 unregister_pix_clk:
 	clk_unregister(fsl_dev->pix_clk);
 disable_clk:
-- 
2.10.0