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gpio: stmpe: Write int status register only when needed

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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>
This commit is contained in:
Patrice Chotard 2016-08-10 09:39:09 +02:00 committed by Lee Jones
parent 287849cb38
commit 6936e1f88d
1 changed files with 8 additions and 4 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

12
drivers/gpio/gpio-stmpe.c
View file

@ -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;