[PATCH 6.14 333/783] pinctrl: sophgo: avoid to modify untouched bit when setting cv1800 pinconf

6.14-stable review patch. If anyone has any objections, please let me know.

------------------

From: Inochi Amaoto inochiama@gmail.com

[ Upstream commit ef1a5121ae3da02372fcb66d9632ed3d47ad5637 ]

When setting pinconf configuration for cv1800 SoC, the driver just writes the value. It may zero some bits of the pinconf register and cause some unexpected error. Add a mask to avoid this.

Signed-off-by: Inochi Amaoto inochiama@gmail.com Link: https://lore.kernel.org/20250211051801.470800-2-inochiama@gmail.com Signed-off-by: Linus Walleij linus.walleij@linaro.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/pinctrl/sophgo/pinctrl-cv18xx.c | 33 +++++++++++++++++-------- 1 file changed, 23 insertions(+), 10 deletions(-)

diff --git a/drivers/pinctrl/sophgo/pinctrl-cv18xx.c b/drivers/pinctrl/sophgo/pinctrl-cv18xx.c index 57f2674e75d68..84b4850771ce2 100644 --- a/drivers/pinctrl/sophgo/pinctrl-cv18xx.c +++ b/drivers/pinctrl/sophgo/pinctrl-cv18xx.c @@ -574,10 +574,10 @@ static int cv1800_pinconf_compute_config(struct cv1800_pinctrl *pctrl, struct cv1800_pin *pin, unsigned long *configs, unsigned int num_configs, - u32 *value) + u32 *value, u32 *mask) { int i; - u32 v = 0; + u32 v = 0, m = 0; enum cv1800_pin_io_type type; int ret;

@@ -596,10 +596,12 @@ static int cv1800_pinconf_compute_config(struct cv1800_pinctrl *pctrl, case PIN_CONFIG_BIAS_PULL_DOWN: v &= ~PIN_IO_PULLDOWN; v |= FIELD_PREP(PIN_IO_PULLDOWN, arg); + m |= PIN_IO_PULLDOWN; break; case PIN_CONFIG_BIAS_PULL_UP: v &= ~PIN_IO_PULLUP; v |= FIELD_PREP(PIN_IO_PULLUP, arg); + m |= PIN_IO_PULLUP; break; case PIN_CONFIG_DRIVE_STRENGTH_UA: ret = cv1800_pinctrl_oc2reg(pctrl, pin, arg); @@ -607,6 +609,7 @@ static int cv1800_pinconf_compute_config(struct cv1800_pinctrl *pctrl, return ret; v &= ~PIN_IO_DRIVE; v |= FIELD_PREP(PIN_IO_DRIVE, ret); + m |= PIN_IO_DRIVE; break; case PIN_CONFIG_INPUT_SCHMITT_UV: ret = cv1800_pinctrl_schmitt2reg(pctrl, pin, arg); @@ -614,6 +617,7 @@ static int cv1800_pinconf_compute_config(struct cv1800_pinctrl *pctrl, return ret; v &= ~PIN_IO_SCHMITT; v |= FIELD_PREP(PIN_IO_SCHMITT, ret); + m |= PIN_IO_SCHMITT; break; case PIN_CONFIG_POWER_SOURCE: /* Ignore power source as it is always fixed */ @@ -621,10 +625,12 @@ static int cv1800_pinconf_compute_config(struct cv1800_pinctrl *pctrl, case PIN_CONFIG_SLEW_RATE: v &= ~PIN_IO_OUT_FAST_SLEW; v |= FIELD_PREP(PIN_IO_OUT_FAST_SLEW, arg); + m |= PIN_IO_OUT_FAST_SLEW; break; case PIN_CONFIG_BIAS_BUS_HOLD: v &= ~PIN_IO_BUS_HOLD; v |= FIELD_PREP(PIN_IO_BUS_HOLD, arg); + m |= PIN_IO_BUS_HOLD; break; default: return -ENOTSUPP; @@ -632,17 +638,19 @@ static int cv1800_pinconf_compute_config(struct cv1800_pinctrl *pctrl, }

*value = v; + *mask = m;

return 0; }

static int cv1800_pin_set_config(struct cv1800_pinctrl *pctrl, unsigned int pin_id, - u32 value) + u32 value, u32 mask) { struct cv1800_pin *pin = cv1800_get_pin(pctrl, pin_id); unsigned long flags; void __iomem *addr; + u32 reg;

if (!pin) return -EINVAL; @@ -650,7 +658,10 @@ static int cv1800_pin_set_config(struct cv1800_pinctrl *pctrl, addr = cv1800_pinctrl_get_component_addr(pctrl, &pin->conf);

raw_spin_lock_irqsave(&pctrl->lock, flags); - writel(value, addr); + reg = readl(addr); + reg &= ~mask; + reg |= value; + writel(reg, addr); raw_spin_unlock_irqrestore(&pctrl->lock, flags);

return 0; @@ -662,16 +673,17 @@ static int cv1800_pconf_set(struct pinctrl_dev *pctldev, { struct cv1800_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev); struct cv1800_pin *pin = cv1800_get_pin(pctrl, pin_id); - u32 value; + u32 value, mask;

if (!pin) return -ENODEV;

if (cv1800_pinconf_compute_config(pctrl, pin, - configs, num_configs, &value)) + configs, num_configs, + &value, &mask)) return -ENOTSUPP;

- return cv1800_pin_set_config(pctrl, pin_id, value); + return cv1800_pin_set_config(pctrl, pin_id, value, mask); }

static int cv1800_pconf_group_set(struct pinctrl_dev *pctldev, @@ -682,7 +694,7 @@ static int cv1800_pconf_group_set(struct pinctrl_dev *pctldev, struct cv1800_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev); const struct group_desc *group; const struct cv1800_pin_mux_config *pinmuxs; - u32 value; + u32 value, mask; int i;

group = pinctrl_generic_get_group(pctldev, gsel); @@ -692,11 +704,12 @@ static int cv1800_pconf_group_set(struct pinctrl_dev *pctldev, pinmuxs = group->data;

if (cv1800_pinconf_compute_config(pctrl, pinmuxs[0].pin, - configs, num_configs, &value)) + configs, num_configs, + &value, &mask)) return -ENOTSUPP;

for (i = 0; i < group->grp.npins; i++) - cv1800_pin_set_config(pctrl, group->grp.pins[i], value); + cv1800_pin_set_config(pctrl, group->grp.pins[i], value, mask);

return 0; }