| Message ID | 20220225175320.11041-5-biju.das.jz@bp.renesas.com |
|---|---|
| State | New |
| Headers | show |
| Series | RZG2L_WDT Fixes and Improvements | expand |
On Fri, Feb 25, 2022 at 6:53 PM Biju Das <biju.das.jz@bp.renesas.com> wrote: > Both rzg2l_wdt_probe() and rzg2l_wdt_start() calls reset_control_ > deassert() which results in a reset control imbalance. > > This patch fixes reset control imbalance by removing reset_control_ > deassert() from rzg2l_wdt_start() and replaces reset_control_assert with > reset_control_reset in rzg2l_wdt_stop() as watchdog module can be stopped > only by a module reset. This change will allow us to restart WDT after > stop() by configuring WDT timeout and enable registers. > > Fixes: 2cbc5cd0b55fa2 ("watchdog: Add Watchdog Timer driver for RZ/G2L") > Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com> Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be> Gr{oetje,eeting}s, Geert -- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org In personal conversations with technical people, I call myself a hacker. But when I'm talking to journalists I just say "programmer" or something like that. -- Linus Torvalds
On Fri, Feb 25, 2022 at 05:53:17PM +0000, Biju Das wrote: > Both rzg2l_wdt_probe() and rzg2l_wdt_start() calls reset_control_ > deassert() which results in a reset control imbalance. > > This patch fixes reset control imbalance by removing reset_control_ > deassert() from rzg2l_wdt_start() and replaces reset_control_assert with > reset_control_reset in rzg2l_wdt_stop() as watchdog module can be stopped > only by a module reset. This change will allow us to restart WDT after > stop() by configuring WDT timeout and enable registers. > > Fixes: 2cbc5cd0b55fa2 ("watchdog: Add Watchdog Timer driver for RZ/G2L") > Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com> > Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be> Reviewed-by: Guenter Roeck <linux@roeck-us.net> > --- > v5: > * New patch > --- > drivers/watchdog/rzg2l_wdt.c | 3 +-- > 1 file changed, 1 insertion(+), 2 deletions(-) > > diff --git a/drivers/watchdog/rzg2l_wdt.c b/drivers/watchdog/rzg2l_wdt.c > index 48dfe6e5e64f..88274704b260 100644 > --- a/drivers/watchdog/rzg2l_wdt.c > +++ b/drivers/watchdog/rzg2l_wdt.c > @@ -88,7 +88,6 @@ static int rzg2l_wdt_start(struct watchdog_device *wdev) > { > struct rzg2l_wdt_priv *priv = watchdog_get_drvdata(wdev); > > - reset_control_deassert(priv->rstc); > pm_runtime_get_sync(wdev->parent); > > /* Initialize time out */ > @@ -108,7 +107,7 @@ static int rzg2l_wdt_stop(struct watchdog_device *wdev) > struct rzg2l_wdt_priv *priv = watchdog_get_drvdata(wdev); > > pm_runtime_put(wdev->parent); > - reset_control_assert(priv->rstc); > + reset_control_reset(priv->rstc); > > return 0; > }
diff --git a/drivers/watchdog/rzg2l_wdt.c b/drivers/watchdog/rzg2l_wdt.c index 48dfe6e5e64f..88274704b260 100644 --- a/drivers/watchdog/rzg2l_wdt.c +++ b/drivers/watchdog/rzg2l_wdt.c @@ -88,7 +88,6 @@ static int rzg2l_wdt_start(struct watchdog_device *wdev) { struct rzg2l_wdt_priv *priv = watchdog_get_drvdata(wdev); - reset_control_deassert(priv->rstc); pm_runtime_get_sync(wdev->parent); /* Initialize time out */ @@ -108,7 +107,7 @@ static int rzg2l_wdt_stop(struct watchdog_device *wdev) struct rzg2l_wdt_priv *priv = watchdog_get_drvdata(wdev); pm_runtime_put(wdev->parent); - reset_control_assert(priv->rstc); + reset_control_reset(priv->rstc); return 0; }
Both rzg2l_wdt_probe() and rzg2l_wdt_start() calls reset_control_ deassert() which results in a reset control imbalance. This patch fixes reset control imbalance by removing reset_control_ deassert() from rzg2l_wdt_start() and replaces reset_control_assert with reset_control_reset in rzg2l_wdt_stop() as watchdog module can be stopped only by a module reset. This change will allow us to restart WDT after stop() by configuring WDT timeout and enable registers. Fixes: 2cbc5cd0b55fa2 ("watchdog: Add Watchdog Timer driver for RZ/G2L") Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com> --- v5: * New patch --- drivers/watchdog/rzg2l_wdt.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-)