Upgrade to 4.4.50-rt62

The current kernel is based on rt kernel v4.4.6-rt14. We will upgrade it
to 4.4.50-rt62.
The command to achieve it is:
a) Clone a git repo from
git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-stable-rt.git

b) Get the diff between this two changesets:
git diff 640eca2901f3435e616157b11379d3223a44b391
705619beeea1b0b48219a683fd1a901a86fdaf5e

where the two commits are:
[yjiang5@jnakajim-build linux-stable-rt]$ git show --oneline --name-only
640eca2901f3435e616157b11379d3223a44b391
640eca2901f3 v4.4.6-rt14
localversion-rt
[yjiang5@jnakajim-build linux-stable-rt]$ git show --oneline --name-only
705619beeea1b0b48219a683fd1a901a86fdaf5e
705619beeea1 Linux 4.4.50-rt62
localversion-rt

c) One patch has been backported thus revert the patch before applying.

 filterdiff -p1 -x scripts/package/Makefile
~/tmp/v4.4.6-rt14-4.4.50-rt62.diff  |patch -p1 --dry-run

Upstream status: backport

Change-Id: I244d57a32f6066e5a5b9915f9fbf99e7bbca6e01
Signed-off-by: Yunhong Jiang <yunhong.jiang@linux.intel.com>

1 files changed, 8 insertions, 6 deletions

diff --git a/kernel/drivers/pinctrl/mediatek/pinctrl-mtk-common.c b/kernel/drivers/pinctrl/mediatek/pinctrl-mtk-common.c
index 5c717275a..181b35879 100644
--- a/kernel/drivers/pinctrl/mediatek/pinctrl-mtk-common.c
+++ b/kernel/drivers/pinctrl/mediatek/pinctrl-mtk-common.c
@@ -939,7 +939,8 @@ static int mtk_gpio_set_debounce(struct gpio_chip *chip, unsigned offset,
 	struct mtk_pinctrl *pctl = dev_get_drvdata(chip->dev);
 	int eint_num, virq, eint_offset;
 	unsigned int set_offset, bit, clr_bit, clr_offset, rst, i, unmask, dbnc;
-	static const unsigned int dbnc_arr[] = {0 , 1, 16, 32, 64, 128, 256};
+	static const unsigned int debounce_time[] = {500, 1000, 16000, 32000, 64000,
+						128000, 256000};
 	const struct mtk_desc_pin *pin;
 	struct irq_data *d;
 
@@ -957,9 +958,9 @@ static int mtk_gpio_set_debounce(struct gpio_chip *chip, unsigned offset,
 	if (!mtk_eint_can_en_debounce(pctl, eint_num))
 		return -ENOSYS;
 
-	dbnc = ARRAY_SIZE(dbnc_arr);
-	for (i = 0; i < ARRAY_SIZE(dbnc_arr); i++) {
-		if (debounce <= dbnc_arr[i]) {
+	dbnc = ARRAY_SIZE(debounce_time);
+	for (i = 0; i < ARRAY_SIZE(debounce_time); i++) {
+		if (debounce <= debounce_time[i]) {
 			dbnc = i;
 			break;
 		}
@@ -1190,9 +1191,10 @@ static void mtk_eint_irq_handler(struct irq_desc *desc)
 	const struct mtk_desc_pin *pin;
 
 	chained_irq_enter(chip, desc);
-	for (eint_num = 0; eint_num < pctl->devdata->ap_num; eint_num += 32) {
+	for (eint_num = 0;
+	     eint_num < pctl->devdata->ap_num;
+	     eint_num += 32, reg += 4) {
 		status = readl(reg);
-		reg += 4;
 		while (status) {
 			offset = __ffs(status);
 			index = eint_num + offset;