diff options
| author | Chris Wilson <chris@chris-wilson.co.uk> | 2010-12-09 20:22:04 +0000 |
|---|---|---|
| committer | Chris Wilson <chris@chris-wilson.co.uk> | 2010-12-09 20:22:04 +0000 |
| commit | 8d5203ca62539c6ab36a5bc2402c2de1de460e30 (patch) | |
| tree | dd0c5815cea7134904855bef8d81a9b31e45c06b /drivers/gpio/cs5535-gpio.c | |
| parent | 8fd2685911cb6c140e6d0588ac04990ce65d4537 (diff) | |
| parent | 63abf3edaf42d0b9f278df90fe41c7ed4796b6b1 (diff) | |
Merge branch 'drm-intel-fixes' into drm-intel-next
Diffstat (limited to 'drivers/gpio/cs5535-gpio.c')
| -rw-r--r-- | drivers/gpio/cs5535-gpio.c | 16 |
1 files changed, 14 insertions, 2 deletions
diff --git a/drivers/gpio/cs5535-gpio.c b/drivers/gpio/cs5535-gpio.c index e23c06893d19..599f6c9e0fbf 100644 --- a/drivers/gpio/cs5535-gpio.c +++ b/drivers/gpio/cs5535-gpio.c @@ -56,6 +56,18 @@ static struct cs5535_gpio_chip { * registers, see include/linux/cs5535.h. */ +static void errata_outl(u32 val, unsigned long addr) +{ + /* + * According to the CS5536 errata (#36), after suspend + * a write to the high bank GPIO register will clear all + * non-selected bits; the recommended workaround is a + * read-modify-write operation. + */ + val |= inl(addr); + outl(val, addr); +} + static void __cs5535_gpio_set(struct cs5535_gpio_chip *chip, unsigned offset, unsigned int reg) { @@ -64,7 +76,7 @@ static void __cs5535_gpio_set(struct cs5535_gpio_chip *chip, unsigned offset, outl(1 << offset, chip->base + reg); else /* high bank register */ - outl(1 << (offset - 16), chip->base + 0x80 + reg); + errata_outl(1 << (offset - 16), chip->base + 0x80 + reg); } void cs5535_gpio_set(unsigned offset, unsigned int reg) @@ -86,7 +98,7 @@ static void __cs5535_gpio_clear(struct cs5535_gpio_chip *chip, unsigned offset, outl(1 << (offset + 16), chip->base + reg); else /* high bank register */ - outl(1 << offset, chip->base + 0x80 + reg); + errata_outl(1 << offset, chip->base + 0x80 + reg); } void cs5535_gpio_clear(unsigned offset, unsigned int reg) |