[PATCH 5.10 061/105] gpio: pca953x: use the correct range when do regmap sync

From: Greg Kroah-Hartman
Date: Wed Jul 27 2022 - 12:56:44 EST


From: Haibo Chen <haibo.chen@xxxxxxx>

[ Upstream commit 2abc17a93867dc816f0ed9d32021dda8078e7330 ]

regmap will sync a range of registers, here use the correct range
to make sure the sync do not touch other unexpected registers.

Find on pca9557pw on imx8qxp/dxl evk board, this device support
8 pin, so only need one register(8 bits) to cover all the 8 pins's
property setting. But when sync the output, we find it actually
update two registers, output register and the following register.

Fixes: b76574300504 ("gpio: pca953x: Restore registers after suspend/resume cycle")
Fixes: ec82d1eba346 ("gpio: pca953x: Zap ad-hoc reg_output cache")
Fixes: 0f25fda840a9 ("gpio: pca953x: Zap ad-hoc reg_direction cache")
Signed-off-by: Haibo Chen <haibo.chen@xxxxxxx>
Reviewed-by: Andy Shevchenko <andy.shevchenko@xxxxxxxxx>
Signed-off-by: Bartosz Golaszewski <brgl@xxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/gpio/gpio-pca953x.c | 12 ++++++------
1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/gpio/gpio-pca953x.c b/drivers/gpio/gpio-pca953x.c
index bd7828e0f2f5..b63ac46beceb 100644
--- a/drivers/gpio/gpio-pca953x.c
+++ b/drivers/gpio/gpio-pca953x.c
@@ -899,12 +899,12 @@ static int device_pca95xx_init(struct pca953x_chip *chip, u32 invert)
int ret;

ret = regcache_sync_region(chip->regmap, chip->regs->output,
- chip->regs->output + NBANK(chip));
+ chip->regs->output + NBANK(chip) - 1);
if (ret)
goto out;

ret = regcache_sync_region(chip->regmap, chip->regs->direction,
- chip->regs->direction + NBANK(chip));
+ chip->regs->direction + NBANK(chip) - 1);
if (ret)
goto out;

@@ -1117,14 +1117,14 @@ static int pca953x_regcache_sync(struct device *dev)
* sync these registers first and only then sync the rest.
*/
regaddr = pca953x_recalc_addr(chip, chip->regs->direction, 0);
- ret = regcache_sync_region(chip->regmap, regaddr, regaddr + NBANK(chip));
+ ret = regcache_sync_region(chip->regmap, regaddr, regaddr + NBANK(chip) - 1);
if (ret) {
dev_err(dev, "Failed to sync GPIO dir registers: %d\n", ret);
return ret;
}

regaddr = pca953x_recalc_addr(chip, chip->regs->output, 0);
- ret = regcache_sync_region(chip->regmap, regaddr, regaddr + NBANK(chip));
+ ret = regcache_sync_region(chip->regmap, regaddr, regaddr + NBANK(chip) - 1);
if (ret) {
dev_err(dev, "Failed to sync GPIO out registers: %d\n", ret);
return ret;
@@ -1134,7 +1134,7 @@ static int pca953x_regcache_sync(struct device *dev)
if (chip->driver_data & PCA_PCAL) {
regaddr = pca953x_recalc_addr(chip, PCAL953X_IN_LATCH, 0);
ret = regcache_sync_region(chip->regmap, regaddr,
- regaddr + NBANK(chip));
+ regaddr + NBANK(chip) - 1);
if (ret) {
dev_err(dev, "Failed to sync INT latch registers: %d\n",
ret);
@@ -1143,7 +1143,7 @@ static int pca953x_regcache_sync(struct device *dev)

regaddr = pca953x_recalc_addr(chip, PCAL953X_INT_MASK, 0);
ret = regcache_sync_region(chip->regmap, regaddr,
- regaddr + NBANK(chip));
+ regaddr + NBANK(chip) - 1);
if (ret) {
dev_err(dev, "Failed to sync INT mask registers: %d\n",
ret);
--
2.35.1