RK3288 pmu_gpio0 drive strength setting have no higher 16 writing corresponding bits, need to read before write the register.
Signed-off-by: David Wu david.wu@rock-chips.com ---
drivers/pinctrl/rockchip/pinctrl-rk3288.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-)
diff --git a/drivers/pinctrl/rockchip/pinctrl-rk3288.c b/drivers/pinctrl/rockchip/pinctrl-rk3288.c index c52711914e..6f489d2d54 100644 --- a/drivers/pinctrl/rockchip/pinctrl-rk3288.c +++ b/drivers/pinctrl/rockchip/pinctrl-rk3288.c @@ -141,8 +141,14 @@ static int rk3288_set_drive(struct rockchip_pin_bank *bank, return ret; }
- /* enable the write to the equivalent lower bits */ - data = ((1 << ROCKCHIP_DRV_BITS_PER_PIN) - 1) << (bit + 16); + if (bank->bank_num == 0) { + regmap_read(regmap, reg, &data); + data &= ~(((1 << ROCKCHIP_DRV_BITS_PER_PIN) - 1) << bit); + } else { + /* enable the write to the equivalent lower bits */ + data = ((1 << ROCKCHIP_DRV_BITS_PER_PIN) - 1) << (bit + 16); + } + data |= (ret << bit); ret = regmap_write(regmap, reg, data); return ret;