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| author | Jan Kotas <jank@cadence.com> | 2019-04-01 10:09:42 +0100 |
|---|---|---|
| committer | Linus Walleij <linus.walleij@linaro.org> | 2019-04-05 00:04:28 +0700 |
| commit | 4f2f95e9a81299266a4a4f771ac6eb9395528d73 (patch) | |
| tree | 379954760fcedc5e8feeb77895476d26801fffe8 /drivers/gpio | |
| parent | 542f36159f9466faf4bd8d776fdc79f07c048c42 (diff) | |
| download | linux-4f2f95e9a81299266a4a4f771ac6eb9395528d73.tar.gz linux-4f2f95e9a81299266a4a4f771ac6eb9395528d73.tar.bz2 linux-4f2f95e9a81299266a4a4f771ac6eb9395528d73.zip | |
gpio: mmio: Fix bgpio_get_set & bgpio_get_set_multiple
During my regression testing I noticed the cadence GPIO driver
fails on the latest gpio for-next tree.
I think the reason is this patch:
commit 96cd559817f2 ("Merge branch 'devel' into for-next")
Here is a part of the test log:
Loopback 8 -> 24
TESTING: gpio: 488: output direction PASSED
TESTING: gpio: 504: input direction PASSED
TESTING: gpio: 488: 0 PASSED
TESTING: gpio: 488 -> 504: 0 PASSED
TESTING: gpio: 488: 1 FAILED
TESTING: gpio: 488 -> 504: 1 FAILED
TESTING: gpio: 488: 0 PASSED
TESTING: gpio: 488 -> 504: 0 PASSED
It looks like the issue is that gc->bgpio_dir has changed its meaning.
It used to be set to the register value (so it was being inverted).
Now it's always set to 1 for output and 0 for input.
However the bgpio_get_set functions were not updated.
So they invert the bit again, which means a wrong register
is being accessed.
This patch fixes that by removing the unnecessary inversion.
Signed-off-by: Jan Kotas <jank@cadence.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/gpio')
| -rw-r--r-- | drivers/gpio/gpio-mmio.c | 21 |
1 files changed, 2 insertions, 19 deletions
diff --git a/drivers/gpio/gpio-mmio.c b/drivers/gpio/gpio-mmio.c index f172b4382d8d..04be18b95485 100644 --- a/drivers/gpio/gpio-mmio.c +++ b/drivers/gpio/gpio-mmio.c @@ -134,17 +134,6 @@ static int bgpio_get_set(struct gpio_chip *gc, unsigned int gpio) unsigned long pinmask = bgpio_line2mask(gc, gpio); bool dir = !!(gc->bgpio_dir & pinmask); - /* - * If the direction is OUT we read the value from the SET - * register, and if the direction is IN we read the value - * from the DAT register. - * - * If the direction bits are inverted, naturally this gets - * inverted too. - */ - if (gc->bgpio_dir_inverted) - dir = !dir; - if (dir) return !!(gc->read_reg(gc->reg_set) & pinmask); else @@ -164,14 +153,8 @@ static int bgpio_get_set_multiple(struct gpio_chip *gc, unsigned long *mask, /* Make sure we first clear any bits that are zero when we read the register */ *bits &= ~*mask; - /* Exploit the fact that we know which directions are set */ - if (gc->bgpio_dir_inverted) { - set_mask = *mask & ~gc->bgpio_dir; - get_mask = *mask & gc->bgpio_dir; - } else { - set_mask = *mask & gc->bgpio_dir; - get_mask = *mask & ~gc->bgpio_dir; - } + set_mask = *mask & gc->bgpio_dir; + get_mask = *mask & ~gc->bgpio_dir; if (set_mask) *bits |= gc->read_reg(gc->reg_set) & set_mask; |