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Message-Id: <20250505223922.2682012-240-sashal@kernel.org>
Date: Mon, 5 May 2025 18:35:16 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
stable@...r.kernel.org
Cc: Inochi Amaoto <inochiama@...il.com>,
Linus Walleij <linus.walleij@...aro.org>,
Sasha Levin <sashal@...nel.org>,
unicorn_wang@...look.com,
harshit.m.mogalapalli@...cle.com,
linux-gpio@...r.kernel.org,
sophgo@...ts.linux.dev
Subject: [PATCH AUTOSEL 6.12 240/486] pinctrl: sophgo: avoid to modify untouched bit when setting cv1800 pinconf
From: Inochi Amaoto <inochiama@...il.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@...il.com>
Link: https://lore.kernel.org/20250211051801.470800-2-inochiama@gmail.com
Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
Signed-off-by: Sasha Levin <sashal@...nel.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;
}
--
2.39.5
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