The TSC2007 data sheet say in some case the HW may fire some false
interrrupt, which I also met during integrating one TSC2007 device.
So add the disable_irq/enable_irq protection around data handling.
Signed-off-by: Feng Tang <feng.tang@xxxxxxxxx>
---
drivers/input/touchscreen/tsc2007.c | 8 ++++++++
1 files changed, 8 insertions(+), 0 deletions(-)
diff --git a/drivers/input/touchscreen/tsc2007.c b/drivers/input/touchscreen/tsc2007.c
index 1f674cb..789f216 100644
--- a/drivers/input/touchscreen/tsc2007.c
+++ b/drivers/input/touchscreen/tsc2007.c
@@ -171,6 +171,13 @@ static irqreturn_t tsc2007_soft_irq(int irq, void *handle)
struct ts_event tc;
u32 rt;
+ /*
+ * Disable the irq, as it may fire several other IRQs during
+ * this thread is handling data, as suggested by the TSC2007
+ * datasheet, p19, "Touch Detect" chapter
+ */
+ disable_irq_nosync(irq);
+
while (!ts->stopped && tsc2007_is_pen_down(ts)) {
/* pen is down, continue with the measurement */
@@ -221,6 +228,7 @@ static irqreturn_t tsc2007_soft_irq(int irq, void *handle)
if (ts->clear_penirq)
ts->clear_penirq();
+ enable_irq(irq);
return IRQ_HANDLED;
}
--
1.7.1
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