On 26/01/21, Sai Prakash Ranjan wrote:
As per register documentation, QCOM_WDT_ENABLE_IRQ which is BIT(1) of watchdog control register is wakeup interrupt enable bit and not related to bark interrupt at all, BIT(0) is used for that. So remove incorrect usage of this bit when supporting bark irq for pre-timeout notification. Currently with this bit set and bark interrupt specified, pre-timeout notification and/or watchdog reset/bite does not occur.
Fixes: 36375491a439 ("watchdog: qcom: support pre-timeout when the bark irq is available") Cc: stable@vger.kernel.org Signed-off-by: Sai Prakash Ranjan saiprakash.ranjan@codeaurora.org
Reading the conversations from when qcom pre-timeout support was added [1], Bjorn already had mentioned it was not right to touch this bit, not sure which SoC the pre-timeout was tested on at that time, but I have tested this on SDM845, SM8150, SC7180 and watchdog bark and bite does not occur with enabling this bit with the bark irq specified in DT.
this was tested on QCS404. have you validated there? unfortunately I no longer have access to that hardware or the documentation
[1] https://lore.kernel.org/linux-watchdog/20190906174009.GC11938@tuxbook-pro/
drivers/watchdog/qcom-wdt.c | 13 +------------ 1 file changed, 1 insertion(+), 12 deletions(-)
diff --git a/drivers/watchdog/qcom-wdt.c b/drivers/watchdog/qcom-wdt.c index 7cf0f2ec649b..e38a87ffe5f5 100644 --- a/drivers/watchdog/qcom-wdt.c +++ b/drivers/watchdog/qcom-wdt.c @@ -22,7 +22,6 @@ enum wdt_reg { }; #define QCOM_WDT_ENABLE BIT(0) -#define QCOM_WDT_ENABLE_IRQ BIT(1) static const u32 reg_offset_data_apcs_tmr[] = { [WDT_RST] = 0x38, @@ -63,16 +62,6 @@ struct qcom_wdt *to_qcom_wdt(struct watchdog_device *wdd) return container_of(wdd, struct qcom_wdt, wdd); } -static inline int qcom_get_enable(struct watchdog_device *wdd) -{
- int enable = QCOM_WDT_ENABLE;
- if (wdd->pretimeout)
enable |= QCOM_WDT_ENABLE_IRQ;- return enable;
-}
static irqreturn_t qcom_wdt_isr(int irq, void *arg) { struct watchdog_device *wdd = arg; @@ -91,7 +80,7 @@ static int qcom_wdt_start(struct watchdog_device *wdd) writel(1, wdt_addr(wdt, WDT_RST)); writel(bark * wdt->rate, wdt_addr(wdt, WDT_BARK_TIME)); writel(wdd->timeout * wdt->rate, wdt_addr(wdt, WDT_BITE_TIME));
- writel(qcom_get_enable(wdd), wdt_addr(wdt, WDT_EN));
- writel(QCOM_WDT_ENABLE, wdt_addr(wdt, WDT_EN)); return 0;
} -- QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation