Subject: + rtc-rtc-at91rm9200-fix-infinite-wait-for-ackupd-irq.patch added to
-mm tree
To:
[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected]
From: [email protected]
Date: Wed, 07 May 2014 14:58:29 -0700
The patch titled
Subject: rtc: rtc-at91rm9200: fix infinite wait for ACKUPD irq
has been added to the -mm tree. Its filename is
rtc-rtc-at91rm9200-fix-infinite-wait-for-ackupd-irq.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/rtc-rtc-at91rm9200-fix-infinite-wait-for-ackupd-irq.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/rtc-rtc-at91rm9200-fix-infinite-wait-for-ackupd-irq.patch
Before you just go and hit "reply", please:
a) Consider who else should be cc'ed
b) Prefer to cc a suitable mailing list as well
c) Ideally: find the original patch on the mailing list and do a
reply-to-all to that, adding suitable additional cc's
*** Remember to use Documentation/SubmitChecklist when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: Boris BREZILLON <[email protected]>
Subject: rtc: rtc-at91rm9200: fix infinite wait for ACKUPD irq
The rtc user must wait at least 1 sec between each time/calandar update
(see atmel's datasheet chapter "Updating Time/Calendar").
Use the 1Hz interrupt to update the at91_rtc_upd_rdy flag and wait for the
at91_rtc_wait_upd_rdy event if the rtc is not ready.
Signed-off-by: Boris BREZILLON <[email protected]>
Reported-by: Bryan Evenson <[email protected]>
Tested-by: Bryan Evenson <[email protected]>
Cc: Andrew Victor <[email protected]>
Cc: Nicolas Ferre <[email protected]>
Cc: Jean-Christophe Plagniol-Villard <[email protected]>
Cc: Alessandro Zummo <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
---
drivers/rtc/rtc-at91rm9200.c | 14 +++++++++++++-
1 file changed, 13 insertions(+), 1 deletion(-)
diff -puN
drivers/rtc/rtc-at91rm9200.c~rtc-rtc-at91rm9200-fix-infinite-wait-for-ackupd-irq
drivers/rtc/rtc-at91rm9200.c
---
a/drivers/rtc/rtc-at91rm9200.c~rtc-rtc-at91rm9200-fix-infinite-wait-for-ackupd-irq
+++ a/drivers/rtc/rtc-at91rm9200.c
@@ -48,11 +48,13 @@ struct at91_rtc_config {
static const struct at91_rtc_config *at91_rtc_config;
static DECLARE_COMPLETION(at91_rtc_updated);
+static DECLARE_COMPLETION(at91_rtc_wait_upd_rdy);
static unsigned int at91_alarm_year = AT91_RTC_EPOCH;
static void __iomem *at91_rtc_regs;
static int irq;
static DEFINE_SPINLOCK(at91_rtc_lock);
static u32 at91_rtc_shadow_imr;
+static bool at91_rtc_upd_rdy;
static void at91_rtc_write_ier(u32 mask)
{
@@ -161,6 +163,8 @@ static int at91_rtc_settime(struct devic
1900 + tm->tm_year, tm->tm_mon, tm->tm_mday,
tm->tm_hour, tm->tm_min, tm->tm_sec);
+ wait_for_completion(&at91_rtc_wait_upd_rdy);
+
/* Stop Time/Calendar from counting */
cr = at91_rtc_read(AT91_RTC_CR);
at91_rtc_write(AT91_RTC_CR, cr | AT91_RTC_UPDCAL | AT91_RTC_UPDTIM);
@@ -183,6 +187,7 @@ static int at91_rtc_settime(struct devic
/* Restart Time/Calendar */
cr = at91_rtc_read(AT91_RTC_CR);
+ at91_rtc_upd_rdy = 0;
at91_rtc_write(AT91_RTC_CR, cr & ~(AT91_RTC_UPDCAL | AT91_RTC_UPDTIM));
return 0;
@@ -290,8 +295,13 @@ static irqreturn_t at91_rtc_interrupt(in
if (rtsr) { /* this interrupt is shared! Is it ours? */
if (rtsr & AT91_RTC_ALARM)
events |= (RTC_AF | RTC_IRQF);
- if (rtsr & AT91_RTC_SECEV)
+ if (rtsr & AT91_RTC_SECEV) {
events |= (RTC_UF | RTC_IRQF);
+ if (!at91_rtc_upd_rdy) {
+ at91_rtc_upd_rdy = 1;
+ complete(&at91_rtc_wait_upd_rdy);
+ }
+ }
if (rtsr & AT91_RTC_ACKUPD)
complete(&at91_rtc_updated);
@@ -413,6 +423,8 @@ static int __init at91_rtc_probe(struct
return PTR_ERR(rtc);
platform_set_drvdata(pdev, rtc);
+ /* Enable 1Hz events */
+ at91_rtc_write_ier(AT91_RTC_SECEV);
dev_info(&pdev->dev, "AT91 Real Time Clock driver.\n");
return 0;
}
_
Patches currently in -mm which might be from [email protected]
are
rtc-rtc-at91rm9200-fix-infinite-wait-for-ackupd-irq.patch
linux-next.patch
--
To unsubscribe from this list: send the line "unsubscribe stable" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
