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| author | Patrice Chotard <patrice.chotard@st.com> | 2016-08-10 09:39:09 +0200 |
|---|---|---|
| committer | Lee Jones <lee.jones@linaro.org> | 2016-08-10 09:23:49 +0100 |
| commit | 6936e1f88d233444ac8010d9b6bfaac3ba698ee2 (patch) | |
| tree | 3b786c66acb4d0fd948794897e0e9093afcfeb1a | |
| parent | 287849cb3814a5077c79a2489bef055c9f5e656c (diff) | |
| download | linux-stable-6936e1f88d233444ac8010d9b6bfaac3ba698ee2.tar.gz linux-stable-6936e1f88d233444ac8010d9b6bfaac3ba698ee2.tar.bz2 linux-stable-6936e1f88d233444ac8010d9b6bfaac3ba698ee2.zip | |
gpio: stmpe: Write int status register only when needed
On STMPE801/1801 datasheets, it's mentionned writing
in interrupt status register has no effect, bits are
cleared when reading.
Signed-off-by: Amelie DELAUNAY <amelie.delaunay@st.com>
Signed-off-by: Patrice Chotard <patrice.chotard@st.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
| -rw-r--r-- | drivers/gpio/gpio-stmpe.c | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/drivers/gpio/gpio-stmpe.c b/drivers/gpio/gpio-stmpe.c index fdac5d9e5b8d..5806af549ddf 100644 --- a/drivers/gpio/gpio-stmpe.c +++ b/drivers/gpio/gpio-stmpe.c @@ -371,12 +371,16 @@ static irqreturn_t stmpe_gpio_irq(int irq, void *dev) stat &= ~(1 << bit); } - stmpe_reg_write(stmpe, statmsbreg + i, status[i]); - - /* Edge detect register is not present on 801 and 1801 */ - if (stmpe->partnum != STMPE801 || stmpe->partnum != STMPE1801) + /* + * interrupt status register write has no effect on + * 801 and 1801, bits are cleared when read. + * Edge detect register is not present on 801 and 1801 + */ + if (stmpe->partnum != STMPE801 || stmpe->partnum != STMPE1801) { + stmpe_reg_write(stmpe, statmsbreg + i, status[i]); stmpe_reg_write(stmpe, stmpe->regs[STMPE_IDX_GPEDR_MSB] + i, status[i]); + } } return IRQ_HANDLED; |