mirrors/linux
2
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git synced 2026-07-22 04:37:32 -04:00
Code Issues Packages Projects Releases Wiki Activity

rtc: renesas-rtca3: Fix PIE clear polling condition in alarm setup error path

Browse Source 
In rtca3_set_alarm(), the setup_failed path attempts to disable the
Periodic Interrupt Enable (PIE) bit and wait until it is cleared.
However, the polling condition passed to readb_poll_timeout_atomic()
uses an incorrect expression:

    !(tmp & ~RTCA3_RCR1_PIE)

As ~RTCA3_RCR1_PIE evaluates to a mask of all bits except PIE, the
condition effectively waits for all non-PIE bits to become zero, which
is unrelated to the intended operation and is unlikely to ever be true.
This causes the poll to time out unnecessarily.

Fix the condition to check for the PIE bit itself being cleared:

    !(tmp & RTCA3_RCR1_PIE)

This correctly waits until PIE is deasserted after being cleared.

Fixes: d448837760 ("rtc: renesas-rtca3: Add driver for RTCA-3 available on Renesas RZ/G3S SoC")
Cc: stable@vger.kernel.org
Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
Tested-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com> # on RZ/G3S
Link: https://patch.msgid.link/20260602192559.1791344-2-prabhakar.mahadev-lad.rj@bp.renesas.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
This commit is contained in:
Lad Prabhakar
2026-06-02 20:25:55 +01:00
committed by Alexandre Belloni
parent c7ab750463
commit 7e342d87aa
1 changed files with 1 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/rtc/rtc-renesas-rtca3.c
View File

@@ -455,7 +455,7 @@ static int rtca3_set_alarm(struct device *dev, struct rtc_wkalrm *wkalrm)
* specified timeout for setup.
*/
writeb(rcr1 & ~RTCA3_RCR1_PIE, priv->base + RTCA3_RCR1);
readb_poll_timeout_atomic(priv->base + RTCA3_RCR1, tmp, !(tmp & ~RTCA3_RCR1_PIE),
readb_poll_timeout_atomic(priv->base + RTCA3_RCR1, tmp, !(tmp & RTCA3_RCR1_PIE),
10, RTCA3_DEFAULT_TIMEOUT_US);
atomic_set(&priv->alrm_sstep, RTCA3_ALRM_SSTEP_DONE);
}