This is a note to let you know that I've just added the patch titled
watchdog: mediatek: Make sure system reset gets asserted in mtk_wdt_restart()
to the 5.15-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:
watchdog-mediatek-make-sure-system-reset-gets-assert.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 15b6923bcd2e79fc5049059d699807d172ac03f1
Author: Yassine Oudjana <y.oudjana@xxxxxxxxxxxxxx>
Date: Wed Nov 6 10:47:51 2024 +0000
watchdog: mediatek: Make sure system reset gets asserted in mtk_wdt_restart()
[ Upstream commit a1495a21e0b8aad92132dfcf9c6fffc1bde9d5b2 ]
Clear the IRQ enable bit of WDT_MODE before asserting software reset
in order to make TOPRGU issue a system reset signal instead of an IRQ.
Fixes: a44a45536f7b ("watchdog: Add driver for Mediatek watchdog")
Signed-off-by: Yassine Oudjana <y.oudjana@xxxxxxxxxxxxxx>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@xxxxxxxxxxxxx>
Reviewed-by: Guenter Roeck <linux@xxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20241106104738.195968-2-y.oudjana@xxxxxxxxxxxxxx
Signed-off-by: Guenter Roeck <linux@xxxxxxxxxxxx>
Signed-off-by: Wim Van Sebroeck <wim@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/watchdog/mtk_wdt.c b/drivers/watchdog/mtk_wdt.c
index 796fbb048cbea..a9d67ead94838 100644
--- a/drivers/watchdog/mtk_wdt.c
+++ b/drivers/watchdog/mtk_wdt.c
@@ -164,9 +164,15 @@ static int mtk_wdt_restart(struct watchdog_device *wdt_dev,
{
struct mtk_wdt_dev *mtk_wdt = watchdog_get_drvdata(wdt_dev);
void __iomem *wdt_base;
+ u32 reg;
wdt_base = mtk_wdt->wdt_base;
+ /* Enable reset in order to issue a system reset instead of an IRQ */
+ reg = readl(wdt_base + WDT_MODE);
+ reg &= ~WDT_MODE_IRQ_EN;
+ writel(reg | WDT_MODE_KEY, wdt_base + WDT_MODE);
+
while (1) {
writel(WDT_SWRST_KEY, wdt_base + WDT_SWRST);
mdelay(5);
