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media: mtk-cir: fix calculation of chk period 

Since commit 528222d853 ("media: rc: harmonize infrared durations to
microseconds"), the calculation of the chk period is wrong. As a result,
all reported IR will have incorrect timings.

Now that the calculations are done in microseconds rather than nanoseconds,
we can fold the calculations in a simpler form with less rounding error.

Tested-by: Frank Wunderlich <frank-w@public-files.de>
Fixes: 528222d853 ("media: rc: harmonize infrared durations to microseconds")
Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
This commit is contained in:
Sean Young 2020-11-29 18:01:26 +01:00 committed by Mauro Carvalho Chehab
parent 44f28934af
commit d904eb0b35
1 changed files with 3 additions and 6 deletions
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9
drivers/media/rc/mtk-cir.c
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@ -151,15 +151,12 @@ static inline u32 mtk_chk_period(struct mtk_ir *ir)
{
u32 val;
/* Period of raw software sampling in ns */
val = DIV_ROUND_CLOSEST(1000000000ul,
clk_get_rate(ir->bus) / ir->data->div);
/*
* Period for software decoder used in the
* unit of raw software sampling
*/
val = DIV_ROUND_CLOSEST(MTK_IR_SAMPLE, val);
val = DIV_ROUND_CLOSEST(clk_get_rate(ir->bus),
USEC_PER_SEC * ir->data->div / MTK_IR_SAMPLE);
dev_dbg(ir->dev, "@pwm clk = \t%lu\n",
clk_get_rate(ir->bus) / ir->data->div);
@ -412,7 +409,7 @@ static int mtk_ir_probe(struct platform_device *pdev)
mtk_irq_enable(ir, MTK_IRINT_EN);
dev_info(dev, "Initialized MT7623 IR driver, sample period = %dus\n",
DIV_ROUND_CLOSEST(MTK_IR_SAMPLE, 1000));
MTK_IR_SAMPLE);
return 0;