linux-kernel - [PATCH v3 2/6] media: s5p-tv: Restore vpll clock rate

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Date:	Wed, 28 Aug 2013 18:13:00 +0200
From:	Mateusz Krawczuk <m.krawczuk@...tner.samsung.com>
To:	kyungmin.park@...sung.com
Cc:	t.stanislaws@...sung.com, m.chehab@...sung.com,
	linux-arm-kernel@...ts.infradead.org, linux-media@...r.kernel.org,
	linux-kernel@...r.kernel.org, rob.herring@...xeda.com,
	pawel.moll@....com, mark.rutland@....com, swarren@...dotorg.org,
	ian.campbell@...rix.com, rob@...dley.net, mturquette@...aro.org,
	tomasz.figa@...il.com, kgene.kim@...sung.com,
	thomas.abraham@...aro.org, s.nawrocki@...sung.com,
	devicetree@...r.kernel.org, linux-doc@...r.kernel.org,
	linux@....linux.org.uk, ben-linux@...ff.org,
	linux-samsung-soc@...r.kernel.org,
	Mateusz Krawczuk <m.krawczuk@...tner.samsung.com>
Subject: [PATCH v3 2/6] media: s5p-tv: Restore vpll clock rate

Restore vpll clock rate if start stream fail or stream is off.

Signed-off-by: Mateusz Krawczuk <m.krawczuk@...tner.samsung.com>
---
 drivers/media/platform/s5p-tv/sdo_drv.c | 24 ++++++++++++++++++++++--
 1 file changed, 22 insertions(+), 2 deletions(-)

diff --git a/drivers/media/platform/s5p-tv/sdo_drv.c b/drivers/media/platform/s5p-tv/sdo_drv.c
index 0afa90f..9dbdfe6 100644
--- a/drivers/media/platform/s5p-tv/sdo_drv.c
+++ b/drivers/media/platform/s5p-tv/sdo_drv.c
@@ -55,6 +55,8 @@ struct sdo_device {
 	struct clk *dacphy;
 	/** clock for control of VPLL */
 	struct clk *fout_vpll;
+	/** vpll rate before sdo stream was on */
+	int vpll_rate;
 	/** regulator for SDO IP power */
 	struct regulator *vdac;
 	/** regulator for SDO plug detection */
@@ -193,17 +195,34 @@ static int sdo_s_power(struct v4l2_subdev *sd, int on)
 
 static int sdo_streamon(struct sdo_device *sdev)
 {
+	int ret;
+
 	/* set proper clock for Timing Generator */
-	clk_set_rate(sdev->fout_vpll, 54000000);
+	sdev->vpll_rate = clk_get_rate(sdev->fout_vpll);
+	ret = clk_set_rate(sdev->fout_vpll, 54000000);
+	if (ret < 0) {
+		dev_err(sdev->dev,
+			"Failed to set vpll rate!\n");
+		return ret;
+	}
 	dev_info(sdev->dev, "fout_vpll.rate = %lu\n",
 	clk_get_rate(sdev->fout_vpll));
 	/* enable clock in SDO */
 	sdo_write_mask(sdev, SDO_CLKCON, ~0, SDO_TVOUT_CLOCK_ON);
-	clk_enable(sdev->dacphy);
+	ret = clk_enable(sdev->dacphy);
+	if (ret < 0) {
+		dev_err(sdev->dev,
+			"clk_enable(dacphy) failed !\n");
+		goto fail;
+	}
 	/* enable DAC */
 	sdo_write_mask(sdev, SDO_DAC, ~0, SDO_POWER_ON_DAC);
 	sdo_reg_debug(sdev);
 	return 0;
+fail:
+	sdo_write_mask(sdev, SDO_CLKCON, 0, SDO_TVOUT_CLOCK_ON);
+	clk_set_rate(sdev->fout_vpll, sdev->vpll_rate);
+	return ret;
 }
 
 static int sdo_streamoff(struct sdo_device *sdev)
@@ -220,6 +239,7 @@ static int sdo_streamoff(struct sdo_device *sdev)
 	}
 	if (tries == 0)
 		dev_err(sdev->dev, "failed to stop streaming\n");
+	clk_set_rate(sdev->fout_vpll, sdev->vpll_rate);
 	return tries ? 0 : -EIO;
 }
 
-- 
1.8.1.2

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