Patch "watchdog: rzg2l_wdt: Issue a reset before we put the PM clocks" has been added to the 6.2-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

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

    watchdog: rzg2l_wdt: Issue a reset before we put the PM clocks

to the 6.2-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-rzg2l_wdt-issue-a-reset-before-we-put-the-p.patch
and it can be found in the queue-6.2 subdirectory.

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



commit 82c456241622b921f657091720a671b1f176b189
Author: Lad Prabhakar <prabhakar.mahadev-lad.rj@xxxxxxxxxxxxxx>
Date:   Thu Nov 17 11:49:06 2022 +0000

    watchdog: rzg2l_wdt: Issue a reset before we put the PM clocks
    
    [ Upstream commit 6ba6f0f5910d5916539268c0ad55657bb8940616 ]
    
    On RZ/Five SoC it was observed that setting timeout (to say 1 sec) wouldn't
    reset the system.
    
    The procedure described in the HW manual (Procedure for Activating Modules)
    for activating the target module states we need to start supply of the
    clock module before applying the reset signal. This patch makes sure we
    follow the same procedure to clear the registers of the WDT module, fixing
    the issues seen on RZ/Five SoC.
    
    While at it re-used rzg2l_wdt_stop() in rzg2l_wdt_set_timeout() as it has
    the same function calls.
    
    Fixes: 4055ee81009e ("watchdog: rzg2l_wdt: Add set_timeout callback")
    Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@xxxxxxxxxxxxxx>
    Reviewed-by: Guenter Roeck <linux@xxxxxxxxxxxx>
    Reviewed-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
    Reviewed-by: Biju Das <biju.das.jz@xxxxxxxxxxxxxx>
    Link: https://lore.kernel.org/r/20221117114907.138583-2-fabrizio.castro.jz@xxxxxxxxxxx
    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/rzg2l_wdt.c b/drivers/watchdog/rzg2l_wdt.c
index 974a4194a8fd6..ceca42db08374 100644
--- a/drivers/watchdog/rzg2l_wdt.c
+++ b/drivers/watchdog/rzg2l_wdt.c
@@ -115,25 +115,23 @@ 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_reset(priv->rstc);
+	pm_runtime_put(wdev->parent);
 
 	return 0;
 }
 
 static int rzg2l_wdt_set_timeout(struct watchdog_device *wdev, unsigned int timeout)
 {
-	struct rzg2l_wdt_priv *priv = watchdog_get_drvdata(wdev);
-
 	wdev->timeout = timeout;
 
 	/*
 	 * If the watchdog is active, reset the module for updating the WDTSET
-	 * register so that it is updated with new timeout values.
+	 * register by calling rzg2l_wdt_stop() (which internally calls reset_control_reset()
+	 * to reset the module) so that it is updated with new timeout values.
 	 */
 	if (watchdog_active(wdev)) {
-		pm_runtime_put(wdev->parent);
-		reset_control_reset(priv->rstc);
+		rzg2l_wdt_stop(wdev);
 		rzg2l_wdt_start(wdev);
 	}