linux-kernel - [PATCH] pinctrl: at91-pio4: Fix slew rate disablement

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Date:   Fri, 9 Apr 2021 11:25:22 +0300
From:   Tudor Ambarus <tudor.ambarus@...rochip.com>
To:     <ludovic.desroches@...rochip.com>, <linus.walleij@...aro.org>,
        <claudiu.beznea@...rochip.com>
CC:     <nicolas.ferre@...rochip.com>, <alexandre.belloni@...tlin.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-gpio@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Tudor Ambarus <tudor.ambarus@...rochip.com>
Subject: [PATCH] pinctrl: at91-pio4: Fix slew rate disablement

The slew rate was enabled by default for each configuration of the
pin. In case the pin had more than one configuration, even if
we set the slew rate as disabled in the device tree, the next pin
configuration would set again the slew rate enabled by default,
overwriting the slew rate disablement.
Instead of enabling the slew rate by default for each pin configuration,
enable the slew rate by default just once per pin, regardless of the
number of configurations. This way the slew rate disablement will also
work for cases where pins have multiple configurations.

Fixes: 440b144978ba ("pinctrl: at91-pio4: add support for slew-rate")
Signed-off-by: Tudor Ambarus <tudor.ambarus@...rochip.com>
---
 drivers/pinctrl/pinctrl-at91-pio4.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/pinctrl/pinctrl-at91-pio4.c b/drivers/pinctrl/pinctrl-at91-pio4.c
index a5d328808e4c..4c01d8471ffa 100644
--- a/drivers/pinctrl/pinctrl-at91-pio4.c
+++ b/drivers/pinctrl/pinctrl-at91-pio4.c
@@ -801,6 +801,10 @@ static int atmel_conf_pin_config_group_set(struct pinctrl_dev *pctldev,
 
 	conf = atmel_pin_config_read(pctldev, pin_id);
 
+	/* Keep slew rate enabled by default. */
+	if (atmel_pioctrl->slew_rate_support)
+		conf |= ATMEL_PIO_SR_MASK;
+
 	for (i = 0; i < num_configs; i++) {
 		unsigned int param = pinconf_to_config_param(configs[i]);
 		unsigned int arg = pinconf_to_config_argument(configs[i]);
@@ -808,10 +812,6 @@ static int atmel_conf_pin_config_group_set(struct pinctrl_dev *pctldev,
 		dev_dbg(pctldev->dev, "%s: pin=%u, config=0x%lx\n",
 			__func__, pin_id, configs[i]);
 
-		/* Keep slew rate enabled by default. */
-		if (atmel_pioctrl->slew_rate_support)
-			conf |= ATMEL_PIO_SR_MASK;
-
 		switch (param) {
 		case PIN_CONFIG_BIAS_DISABLE:
 			conf &= (~ATMEL_PIO_PUEN_MASK);
-- 
2.25.1