rtc: renesas-rtca3: Disable interrupts only if the RTC is enabled

If the RTC is not enabled and the code attempts to disable the interrupt,
the readb_poll_timeout_atomic() function in the
rtca3_alarm_irq_set_helper() may timeout, leading to probe failures.
This issue is reproducible on some devices because the initial values of
the PIE and AIE bits in the RCR1 register are undefined.

To prevent probe failures in this scenario, disable RTC interrupts only
when the RTC is actually enabled.

Fixes: d4488377609e ("rtc: renesas-rtca3: Add driver for RTCA-3 available on Renesas RZ/G3S SoC")
Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
Link: https://lore.kernel.org/r/20250205095519.2031742-1-claudiu.beznea.uj@bp.renesas.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

diff --git a/drivers/rtc/rtc-renesas-rtca3.c b/drivers/rtc/rtc-renesas-rtca3.c
index a056291d388765a0078f9bf7268404f82b454721..ab816bdf0d77610f56d2f49dd6ea9a63bc7e337b 100644 (file)
--- a/drivers/rtc/rtc-renesas-rtca3.c
+++ b/drivers/rtc/rtc-renesas-rtca3.c
@@ -586,17 +586,14 @@ static int rtca3_initial_setup(struct clk *clk, struct rtca3_priv *priv)
         */
        usleep_range(sleep_us, sleep_us + 10);
 
-       /* Disable all interrupts. */
-       mask = RTCA3_RCR1_AIE | RTCA3_RCR1_CIE | RTCA3_RCR1_PIE;
-       ret = rtca3_alarm_irq_set_helper(priv, mask, 0);
-       if (ret)
-               return ret;
-
        mask = RTCA3_RCR2_START | RTCA3_RCR2_HR24;
        val = readb(priv->base + RTCA3_RCR2);
-       /* Nothing to do if already started in 24 hours and calendar count mode. */
-       if ((val & mask) == mask)
-               return 0;
+       /* Only disable the interrupts if already started in 24 hours and calendar count mode. */
+       if ((val & mask) == mask) {
+               /* Disable all interrupts. */
+               mask = RTCA3_RCR1_AIE | RTCA3_RCR1_CIE | RTCA3_RCR1_PIE;
+               return rtca3_alarm_irq_set_helper(priv, mask, 0);
+       }
 
        /* Reconfigure the RTC in 24 hours and calendar count mode. */
        mask = RTCA3_RCR2_START | RTCA3_RCR2_CNTMD;