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From:   Stefan Riedmueller <s.riedmueller@phytec.de>
To:     Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
        Mauro Carvalho Chehab <mchehab@kernel.org>,
        Rob Herring <robh+dt@kernel.org>
Cc:     Enrico Scholz <enrico.scholz@sigma-chemnitz.de>,
        Stefan Riedmueller <s.riedmueller@phytec.de>,
        Sakari Ailus <sakari.ailus@linux.intel.com>,
        linux-media@vger.kernel.org, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org
Subject: [PATCH v6 1/6] media: mt9p031: Read back the real clock rate
Date:   Wed, 14 Jul 2021 15:38:44 +0200
Message-Id: <20210714133849.1041619-2-s.riedmueller@phytec.de>
In-Reply-To: <20210714133849.1041619-1-s.riedmueller@phytec.de>
References: <20210714133849.1041619-1-s.riedmueller@phytec.de>
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From: Enrico Scholz <enrico.scholz@sigma-chemnitz.de>

The real and requested clock can differ and because it is used to
calculate PLL values, the real clock rate should be read.

Signed-off-by: Enrico Scholz <enrico.scholz@sigma-chemnitz.de>
Signed-off-by: Stefan Riedmueller <s.riedmueller@phytec.de>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
---
 drivers/media/i2c/mt9p031.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/media/i2c/mt9p031.c b/drivers/media/i2c/mt9p031.c
index 6eb88ef99783..9dea7c813852 100644
--- a/drivers/media/i2c/mt9p031.c
+++ b/drivers/media/i2c/mt9p031.c
@@ -229,6 +229,7 @@ static int mt9p031=5Fclk=5Fsetup(struct mt9p031 *mt9p03=
1)
=20
 	struct i2c=5Fclient *client =3D v4l2=5Fget=5Fsubdevdata(&mt9p031->subdev);
 	struct mt9p031=5Fplatform=5Fdata *pdata =3D mt9p031->pdata;
+	unsigned long ext=5Ffreq;
 	int ret;
=20
 	mt9p031->clk =3D devm=5Fclk=5Fget(&client->dev, NULL);
@@ -239,13 +240,15 @@ static int mt9p031=5Fclk=5Fsetup(struct mt9p031 *mt9p=
031)
 	if (ret < 0)
 		return ret;
=20
+	ext=5Ffreq =3D clk=5Fget=5Frate(mt9p031->clk);
+
 	/* If the external clock frequency is out of bounds for the PLL use the
 	 * pixel clock divider only and disable the PLL.
 	 */
-	if (pdata->ext=5Ffreq > limits.ext=5Fclock=5Fmax) {
+	if (ext=5Ffreq > limits.ext=5Fclock=5Fmax) {
 		unsigned int div;
=20
-		div =3D DIV=5FROUND=5FUP(pdata->ext=5Ffreq, pdata->target=5Ffreq);
+		div =3D DIV=5FROUND=5FUP(ext=5Ffreq, pdata->target=5Ffreq);
 		div =3D roundup=5Fpow=5Fof=5Ftwo(div) / 2;
=20
 		mt9p031->clk=5Fdiv =3D min=5Ft(unsigned int, div, 64);
@@ -254,7 +257,7 @@ static int mt9p031=5Fclk=5Fsetup(struct mt9p031 *mt9p03=
1)
 		return 0;
 	}
=20
-	mt9p031->pll.ext=5Fclock =3D pdata->ext=5Ffreq;
+	mt9p031->pll.ext=5Fclock =3D ext=5Ffreq;
 	mt9p031->pll.pix=5Fclock =3D pdata->target=5Ffreq;
 	mt9p031->use=5Fpll =3D true;
=20
--=20
2.25.1