From: Lucas Stach <l.stach@pengutronix.de>
To: barebox@lists.infradead.org
Subject: [PATCH 1/2] video: ipuv3: use closest fractional divider
Date: Mon, 12 Nov 2018 17:22:56 +0100 [thread overview]
Message-ID: <20181112162257.2209-1-l.stach@pengutronix.de> (raw)
Currently the divider is always rounded down, which may lead to a
rather big overshoot of the display clock. Try to match the clock
better by rounding to closest.
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
---
drivers/video/imx-ipu-v3/ipu-di.c | 5 +----
1 file changed, 1 insertion(+), 4 deletions(-)
diff --git a/drivers/video/imx-ipu-v3/ipu-di.c b/drivers/video/imx-ipu-v3/ipu-di.c
index b6e64fe16a85..5751c678b28e 100644
--- a/drivers/video/imx-ipu-v3/ipu-di.c
+++ b/drivers/video/imx-ipu-v3/ipu-di.c
@@ -140,10 +140,7 @@ static int ipu_di_clk_calc_div(unsigned long inrate, unsigned long outrate)
int div;
tmp *= 16;
-
- do_div(tmp, outrate);
-
- div = tmp;
+ div = DIV_ROUND_CLOSEST(tmp, outrate);
if (div < 0x10)
div = 0x10;
--
2.19.1
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next reply other threads:[~2018-11-12 16:23 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-12 16:22 Lucas Stach [this message]
2018-11-12 16:22 ` [PATCH 2/2] video: ipuv3: use non-fractional clock for parallel display Lucas Stach
2018-11-14 8:59 ` [PATCH 1/2] video: ipuv3: use closest fractional divider Sascha Hauer
2018-11-19 10:05 ` Sascha Hauer
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