Patch "pinctrl: baytrail: Rectify debounce support" has been added to the 4.9-stable tree

Patch "pinctrl: baytrail: Rectify debounce support" has been added to the 4.9-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    pinctrl: baytrail: Rectify debounce support

to the 4.9-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     pinctrl-baytrail-rectify-debounce-support.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 04ff5a095d662e0879f0eb04b9247e092210aeff Mon Sep 17 00:00:00 2001
From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Date: Tue, 10 Jan 2017 16:38:52 +0200
Subject: pinctrl: baytrail: Rectify debounce support

From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

commit 04ff5a095d662e0879f0eb04b9247e092210aeff upstream.

The commit 658b476c742f ("pinctrl: baytrail: Add debounce configuration")
implements debounce for Baytrail pin control, but seems wasn't tested properly.

The register which keeps debounce value is separated from the configuration
one. Writing wrong values to the latter will guarantee wrong behaviour of the
driver and even might break something physically.

Besides above there is missed case how to disable it, which is actually done
through the bit in configuration register.

Rectify implementation here by using proper register for debounce value.

Fixes: 658b476c742f ("pinctrl: baytrail: Add debounce configuration")
Cc: Cristina Ciocan <cristina.ciocan@intel.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/pinctrl/intel/pinctrl-baytrail.c |   28 +++++++++++++++++-----------
 1 file changed, 17 insertions(+), 11 deletions(-)

--- a/drivers/pinctrl/intel/pinctrl-baytrail.c
+++ b/drivers/pinctrl/intel/pinctrl-baytrail.c
@@ -1092,6 +1092,7 @@ static int byt_pin_config_get(struct pin
 	enum pin_config_param param = pinconf_to_config_param(*config);
 	void __iomem *conf_reg = byt_gpio_reg(vg, offset, BYT_CONF0_REG);
 	void __iomem *val_reg = byt_gpio_reg(vg, offset, BYT_VAL_REG);
+	void __iomem *db_reg = byt_gpio_reg(vg, offset, BYT_DEBOUNCE_REG);
 	unsigned long flags;
 	u32 conf, pull, val, debounce;
 	u16 arg = 0;
@@ -1128,7 +1129,7 @@ static int byt_pin_config_get(struct pin
 			return -EINVAL;
 
 		raw_spin_lock_irqsave(&vg->lock, flags);
-		debounce = readl(byt_gpio_reg(vg, offset, BYT_DEBOUNCE_REG));
+		debounce = readl(db_reg);
 		raw_spin_unlock_irqrestore(&vg->lock, flags);
 
 		switch (debounce & BYT_DEBOUNCE_PULSE_MASK) {
@@ -1176,6 +1177,7 @@ static int byt_pin_config_set(struct pin
 	unsigned int param, arg;
 	void __iomem *conf_reg = byt_gpio_reg(vg, offset, BYT_CONF0_REG);
 	void __iomem *val_reg = byt_gpio_reg(vg, offset, BYT_VAL_REG);
+	void __iomem *db_reg = byt_gpio_reg(vg, offset, BYT_DEBOUNCE_REG);
 	unsigned long flags;
 	u32 conf, val, debounce;
 	int i, ret = 0;
@@ -1238,36 +1240,40 @@ static int byt_pin_config_set(struct pin
 
 			break;
 		case PIN_CONFIG_INPUT_DEBOUNCE:
-			debounce = readl(byt_gpio_reg(vg, offset,
-						      BYT_DEBOUNCE_REG));
-			conf &= ~BYT_DEBOUNCE_PULSE_MASK;
+			debounce = readl(db_reg);
+			debounce &= ~BYT_DEBOUNCE_PULSE_MASK;
 
 			switch (arg) {
+			case 0:
+				conf &= BYT_DEBOUNCE_EN;
+				break;
 			case 375:
-				conf |= BYT_DEBOUNCE_PULSE_375US;
+				debounce |= BYT_DEBOUNCE_PULSE_375US;
 				break;
 			case 750:
-				conf |= BYT_DEBOUNCE_PULSE_750US;
+				debounce |= BYT_DEBOUNCE_PULSE_750US;
 				break;
 			case 1500:
-				conf |= BYT_DEBOUNCE_PULSE_1500US;
+				debounce |= BYT_DEBOUNCE_PULSE_1500US;
 				break;
 			case 3000:
-				conf |= BYT_DEBOUNCE_PULSE_3MS;
+				debounce |= BYT_DEBOUNCE_PULSE_3MS;
 				break;
 			case 6000:
-				conf |= BYT_DEBOUNCE_PULSE_6MS;
+				debounce |= BYT_DEBOUNCE_PULSE_6MS;
 				break;
 			case 12000:
-				conf |= BYT_DEBOUNCE_PULSE_12MS;
+				debounce |= BYT_DEBOUNCE_PULSE_12MS;
 				break;
 			case 24000:
-				conf |= BYT_DEBOUNCE_PULSE_24MS;
+				debounce |= BYT_DEBOUNCE_PULSE_24MS;
 				break;
 			default:
 				ret = -EINVAL;
 			}
 
+			if (!ret)
+				writel(debounce, db_reg);
 			break;
 		default:
 			ret = -ENOTSUPP;


Patches currently in stable-queue which might be from andriy.shevchenko@linux.intel.com are

queue-4.9/pinctrl-baytrail-rectify-debounce-support.patch
queue-4.9/platform-x86-intel_mid_powerbtn-set-irq_oneshot.patch
queue-4.9/platform-x86-mlx-platform-free-first-dev-on-error.patch