From: Alexander Sverdlin <alexander.sverdlin@xxxxxxxxxxx> According to AM62x TRM WDT period is (RTIDWDPRLD + 1) * (2^13) / RTICLK1, Fix the heartbeat recovery. In practice this doesn't affect rounded heatbeat in seconds, but it does correct 4% of error in milliseconds, for, say, default 60s heartbeat. This affects last_ping calculation. Signed-off-by: Alexander Sverdlin <alexander.sverdlin@xxxxxxxxxxx> --- drivers/watchdog/rti_wdt.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/watchdog/rti_wdt.c b/drivers/watchdog/rti_wdt.c index 563d842014dfb..0416e54b17edb 100644 --- a/drivers/watchdog/rti_wdt.c +++ b/drivers/watchdog/rti_wdt.c @@ -273,7 +273,8 @@ static int rti_wdt_probe(struct platform_device *pdev) set_bit(WDOG_HW_RUNNING, &wdd->status); time_left_ms = rti_wdt_get_timeleft_ms(wdd); - heartbeat_ms = readl(wdt->base + RTIDWDPRLD); + /* AM62x TRM: texp = (RTIDWDPRLD + 1) * (2^13) / RTICLK1 */ + heartbeat_ms = readl(wdt->base + RTIDWDPRLD) + 1; heartbeat_ms <<= WDT_PRELOAD_SHIFT; heartbeat_ms *= 1000; do_div(heartbeat_ms, wdt->freq); -- 2.47.0
