Since commit 528222d853f9 ("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@xxxxxxxxxxxxxxx>
Fixes: 528222d853f9 ("media: rc: harmonize infrared durations to microseconds")
Signed-off-by: Sean Young <sean@xxxxxxxx>
---
drivers/media/rc/mtk-cir.c | 9 +++------
1 file changed, 3 insertions(+), 6 deletions(-)
diff --git a/drivers/media/rc/mtk-cir.c b/drivers/media/rc/mtk-cir.c
index 5051a5e5244b..65a136c0fac2 100644
--- a/drivers/media/rc/mtk-cir.c
+++ b/drivers/media/rc/mtk-cir.c
@@ -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;
--
2.28.0
