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watchdog: rzg2l_wdt: Use force reset for WDT reset

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This patch uses the force reset(WDTRSTB) for triggering WDT reset for
restart callback. This method(ie, Generate Reset (WDTRSTB) Signal on
parity error)is faster compared to the overflow method for triggering
watchdog reset.

Overflow method:
	reboot: Restarting system
	Reboot failed -- System halted
	NOTICE:  BL2: v2.5(release):v2.5/rzg2l-1.00-27-gf48f1440c

Parity error method:
	reboot: Restarting system
	NOTICE:  BL2: v2.5(release):v2.5/rzg2l-1.00-27-gf48f1440c

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>
Link: https://lore.kernel.org/r/20220225175320.11041-7-biju.das.jz@bp.renesas.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
This commit is contained in:
Biju Das 2022-02-25 17:53:19 +00:00 committed by Wim Van Sebroeck
parent baf1aace9a
commit f43e6ddbd7
1 changed files with 7 additions and 7 deletions
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14
drivers/watchdog/rzg2l_wdt.c
View File

@ -21,8 +21,11 @@
#define WDTSET 0x04
#define WDTTIM 0x08
#define WDTINT 0x0C
#define PECR 0x10
#define PEEN 0x14
#define WDTCNT_WDTEN BIT(0)
#define WDTINT_INTDISP BIT(0)
#define PEEN_FORCE BIT(0)
#define WDT_DEFAULT_TIMEOUT 60U
@ -117,17 +120,14 @@ static int rzg2l_wdt_restart(struct watchdog_device *wdev,
{
struct rzg2l_wdt_priv *priv = watchdog_get_drvdata(wdev);
/* Reset the module before we modify any register */
reset_control_reset(priv->rstc);
clk_prepare_enable(priv->pclk);
clk_prepare_enable(priv->osc_clk);
/* smallest counter value to reboot soon */
rzg2l_wdt_write(priv, WDTSET_COUNTER_VAL(1), WDTSET);
/* Generate Reset (WDTRSTB) Signal on parity error */
rzg2l_wdt_write(priv, 0, PECR);
/* Enable watchdog timer*/
rzg2l_wdt_write(priv, WDTCNT_WDTEN, WDTCNT);
/* Force parity error */
rzg2l_wdt_write(priv, PEEN_FORCE, PEEN);
return 0;
}