Use msecs_to_jiffies(50) instead of plain (HZ / 50) as the
former is independent of kernel HZ settings and provides
stable delay.
The delay here must be stable, otherwise we might start polling
for pen-up event too early. This would in turn render the
touchscreen unusable.
Signed-off-by: Marek Vasut <marex@xxxxxxx>
Cc: Vipul Kumar Samar <vipulkumar.samar@xxxxxx>
Cc: Viresh Kumar <viresh.kumar@xxxxxxxxxx>
Cc: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>
---
drivers/input/touchscreen/stmpe-ts.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
NOTE: This applies all the way back to Linux ~2.6.36, so I should
probably also submit this for -stable if acceptable ?
diff --git a/drivers/input/touchscreen/stmpe-ts.c b/drivers/input/touchscreen/stmpe-ts.c
index 42ce31a..a8f5ea7 100644
--- a/drivers/input/touchscreen/stmpe-ts.c
+++ b/drivers/input/touchscreen/stmpe-ts.c
@@ -164,7 +164,7 @@ static irqreturn_t stmpe_ts_handler(int irq, void *data)
STMPE_TSC_CTRL_TSC_EN, STMPE_TSC_CTRL_TSC_EN);
/* start polling for touch_det to detect release */
- schedule_delayed_work(&ts->work, HZ / 50);
+ schedule_delayed_work(&ts->work, msecs_to_jiffies(50));
return IRQ_HANDLED;
}
--
2.1.4
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