Input: ad7877 - increase pen up imeout

The time interval between consecutive interrupts depends on a number of
tunables: first_conversion_delay, acquisition_time, averaging and foremost
the pen_down_acc_interval.

Since the mod_timer() action for the PEN UP event happens in the
spi_async() callback function, latencies incurred by the spi bus drivers
also need to be taken into account.

So all in all, give the PEN UP event a bit more wiggle room and increase
timeout to 100ms.

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

diff --git a/drivers/input/touchscreen/ad7877.c b/drivers/input/touchscreen/ad7877.c
index eb83939..e019d53 100644 (file)
--- a/drivers/input/touchscreen/ad7877.c
+++ b/drivers/input/touchscreen/ad7877.c
@@ -46,7 +46,7 @@
 #include <linux/spi/ad7877.h>
 #include <asm/irq.h>
 
-#define        TS_PEN_UP_TIMEOUT       msecs_to_jiffies(50)
+#define        TS_PEN_UP_TIMEOUT       msecs_to_jiffies(100)
 
 #define MAX_SPI_FREQ_HZ                        20000000
 #define        MAX_12BIT                       ((1<<12)-1)