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authorLinus Walleij <linus.walleij@linaro.org>2016-11-24 01:21:17 +0300
committerLinus Walleij <linus.walleij@linaro.org>2016-11-24 18:19:01 +0300
commit1516c6350aa2770b8a5e36d40c3ec5078f92ba70 (patch)
treefc782de26da3c3cd8ef8e0f0e02c83d171325a0b /drivers/gpio/gpio-stmpe.c
parent22eaf13c7ff37a92f4192f8dd1ebff31c4920822 (diff)
downloadlinux-1516c6350aa2770b8a5e36d40c3ec5078f92ba70.tar.xz
gpio: stmpe: fix interrupt handling bug
commit 43db289d00c6 ("gpio: stmpe: Rework registers access") reworked the STMPE register access so as to use [STMPE_IDX_*_LSB + i] to access the 8bit register for a certain bank, assuming the CSB and MSB will follow after the enumerator. For this to work the index needs to go from (size-1) to 0 not 0 to (size-1). However for the GPIO IRQ handler, the status registers we read register MSB + 3 bytes ahead for the 24 bit GPIOs and index registers from MSB upwards and run an index i over the registers UNLESS we are STMPE1600. This is not working when we get to clearing the interrupt EDGE status register STMPE_IDX_GPEDR_[LCM]SB: it is indexed like all other registers [STMPE_IDX_*_LSB + i] but in this loop we index from 0 to get the right bank index for the calculations, and we need to just add i to the MSB. Before this, interrupts on the STMPE2401 were broken, this patch fixes it so it works again. Cc: stable@vger.kernel.org Cc: Patrice Chotard <patrice.chotard@st.com> Fixes: 43db289d00c6 ("gpio: stmpe: Rework registers access") Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/gpio/gpio-stmpe.c')
-rw-r--r--drivers/gpio/gpio-stmpe.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/gpio/gpio-stmpe.c b/drivers/gpio/gpio-stmpe.c
index e7d422a6b90b..e2e1b16a42db 100644
--- a/drivers/gpio/gpio-stmpe.c
+++ b/drivers/gpio/gpio-stmpe.c
@@ -413,7 +413,7 @@ static irqreturn_t stmpe_gpio_irq(int irq, void *dev)
stmpe->partnum != STMPE1801) {
stmpe_reg_write(stmpe, statmsbreg + i, status[i]);
stmpe_reg_write(stmpe,
- stmpe->regs[STMPE_IDX_GPEDR_LSB + i],
+ stmpe->regs[STMPE_IDX_GPEDR_MSB] + i,
status[i]);
}
}