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rtc: stmp3xxx: Don't reset the rtc in .probe() when watchdog is running

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As pointed out in the added comment resetting the rtc also stops the
included watchdog. This is bad if the bootloader started the watchdog to
secure the boot process. So don't reset if the watchdog is running.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Acked-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
This commit is contained in:
Uwe Kleine-König 2018-06-09 08:43:13 +02:00 committed by Alexandre Belloni
parent d6c3029f32
commit dff700fa81
1 changed files with 16 additions and 4 deletions
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20
drivers/rtc/rtc-stmp3xxx.c
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@ -288,10 +288,22 @@ static int stmp3xxx_rtc_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, rtc_data);
err = stmp_reset_block(rtc_data->io);
if (err) {
dev_err(&pdev->dev, "stmp_reset_block failed: %d\n", err);
return err;
/*
* Resetting the rtc stops the watchdog timer that is potentially
* running. So (assuming it is running on purpose) don't reset if the
* watchdog is enabled.
*/
if (readl(rtc_data->io + STMP3XXX_RTC_CTRL) &
STMP3XXX_RTC_CTRL_WATCHDOGEN) {
dev_info(&pdev->dev,
"Watchdog is running, skip resetting rtc\n");
} else {
err = stmp_reset_block(rtc_data->io);
if (err) {
dev_err(&pdev->dev, "stmp_reset_block failed: %d\n",
err);
return err;
}
}
/*