From: Stefan Riedmueller <s.riedmueller@phytec.de>
To: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: Mauro Carvalho Chehab <mchehab@kernel.org>,
Sakari Ailus <sakari.ailus@linux.intel.com>,
linux-media@vger.kernel.org, linux-kernel@vger.kernel.org,
Enrico Scholz <enrico.scholz@sigma-chemnitz.de>,
Stefan Riedmueller <s.riedmueller@phytec.de>
Subject: [PATCH v2 2/5] media: mt9p031: Read back the real clock rate
Date: Wed, 30 Sep 2020 12:51:30 +0200 [thread overview]
Message-ID: <20200930105133.139981-2-s.riedmueller@phytec.de> (raw)
In-Reply-To: <20200930105133.139981-1-s.riedmueller@phytec.de>
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>
---
No changes in v2
---
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 2e6671ef877c..b4c042f418c1 100644
--- a/drivers/media/i2c/mt9p031.c
+++ b/drivers/media/i2c/mt9p031.c
@@ -255,6 +255,7 @@ static int mt9p031_clk_setup(struct mt9p031 *mt9p031)
struct i2c_client *client = v4l2_get_subdevdata(&mt9p031->subdev);
struct mt9p031_platform_data *pdata = mt9p031->pdata;
+ unsigned long ext_freq;
int ret;
mt9p031->clk = devm_clk_get(&client->dev, NULL);
@@ -265,13 +266,15 @@ static int mt9p031_clk_setup(struct mt9p031 *mt9p031)
if (ret < 0)
return ret;
+ ext_freq = clk_get_rate(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_freq > limits.ext_clock_max) {
+ if (ext_freq > limits.ext_clock_max) {
unsigned int div;
- div = DIV_ROUND_UP(pdata->ext_freq, pdata->target_freq);
+ div = DIV_ROUND_UP(ext_freq, pdata->target_freq);
div = roundup_pow_of_two(div) / 2;
mt9p031->clk_div = min_t(unsigned int, div, 64);
@@ -280,7 +283,7 @@ static int mt9p031_clk_setup(struct mt9p031 *mt9p031)
return 0;
}
- mt9p031->pll.ext_clock = pdata->ext_freq;
+ mt9p031->pll.ext_clock = ext_freq;
mt9p031->pll.pix_clock = pdata->target_freq;
mt9p031->use_pll = true;
--
2.25.1
next prev parent reply other threads:[~2020-09-30 10:51 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-30 10:51 [PATCH v2 1/5] media: mt9p031: Add support for 8 bit and 10 bit formats Stefan Riedmueller
2020-09-30 10:51 ` Stefan Riedmueller [this message]
2020-10-01 23:56 ` [PATCH v2 2/5] media: mt9p031: Read back the real clock rate Laurent Pinchart
2020-09-30 10:51 ` [PATCH v2 3/5] media: mt9p031: Implement [gs]_register debug calls Stefan Riedmueller
2020-09-30 11:38 ` Laurent Pinchart
2020-10-01 8:56 ` Stefan Riedmüller
2020-10-02 0:06 ` Laurent Pinchart
2020-10-05 9:33 ` Stefan Riedmüller
2020-09-30 10:51 ` [PATCH v2 4/5] media: mt9p031: Make pixel clock polarity configurable by DT Stefan Riedmueller
2020-10-01 16:10 ` Sakari Ailus
2020-10-01 16:11 ` Sakari Ailus
2020-10-05 8:52 ` Stefan Riedmüller
2020-09-30 10:51 ` [PATCH v2 5/5] media: mt9p031: Fix corrupted frame after restarting stream Stefan Riedmueller
2020-10-02 0:05 ` Laurent Pinchart
2020-10-05 9:28 ` Stefan Riedmüller
2020-10-05 13:08 ` Laurent Pinchart
2020-10-14 7:14 ` Stefan Riedmüller
2020-09-30 11:42 ` [PATCH v2 1/5] media: mt9p031: Add support for 8 bit and 10 bit formats Laurent Pinchart
2020-10-01 9:07 ` Stefan Riedmüller
2020-10-01 23:53 ` Laurent Pinchart
2020-10-05 9:31 ` Stefan Riedmüller
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