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Date: Fri, 5 Apr 2013 16:14:35 +0200
From: Nicolas Ferre <nicolas.ferre@...el.com>
To: Andrew Morton <akpm@...ux-foundation.org>
CC: Johan Hovold <jhovold@...il.com>, <linux-kernel@...r.kernel.org>,
stable <stable@...r.kernel.org>,
Ludovic Desroches <ludovic.desroches@...el.com>,
Douglas Gilbert <dgilbert@...erlog.com>,
Jean-Christophe PLAGNIOL-VILLARD <plagnioj@...osoft.com>,
<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] Revert "drivers/rtc/rtc-at91rm9200.c: use a variable
for storing IMR"
On 04/03/2013 12:18 PM, Nicolas Ferre :
> On 04/03/2013 11:54 AM, Johan Hovold :
>> This reverts commit 0ef1594c017521ea89278e80fe3f80dafb17abde.
>>
>> This patch introduced a few races which cannot be easily fixed with a
>> small follow-up patch. Furthermore, the SoC with the broken hardware
>> register, which this patch intended to add support for, can only be used
>> with device trees, which this driver currently does not support.
>>
>> Cc: stable <stable@...r.kernel.org>
>> Signed-off-by: Johan Hovold <jhovold@...il.com>
>
> Fair enough, after fighting to find a solution that can makes us move
> forward... your strong arguments convinced me.
>
> So, Andrew, please can you take this "revert" patch for 3.9-rc ?
> And sorry for the noise.
>
> Acked-by: Nicolas Ferre <nicolas.ferre@...el.com>
>
> (Andrew, I figured out that you are not in copy of the original email:
> do I need to send it back to you or can you pick it up in patchwork?
> https://patchwork.kernel.org/patch/2385921/
> )
Andrew, ping?
Thanks, best regards,
>> ---
>> drivers/rtc/rtc-at91rm9200.c | 50 +++++++++++++++++---------------------------
>> drivers/rtc/rtc-at91rm9200.h | 1 +
>> 2 files changed, 20 insertions(+), 31 deletions(-)
>>
>> diff --git a/drivers/rtc/rtc-at91rm9200.c b/drivers/rtc/rtc-at91rm9200.c
>> index 0a9f27e..434ebc3 100644
>> --- a/drivers/rtc/rtc-at91rm9200.c
>> +++ b/drivers/rtc/rtc-at91rm9200.c
>> @@ -44,7 +44,6 @@ static DECLARE_COMPLETION(at91_rtc_updated);
>> static unsigned int at91_alarm_year = AT91_RTC_EPOCH;
>> static void __iomem *at91_rtc_regs;
>> static int irq;
>> -static u32 at91_rtc_imr;
>>
>> /*
>> * Decode time/date into rtc_time structure
>> @@ -109,11 +108,9 @@ static int at91_rtc_settime(struct device *dev, struct rtc_time *tm)
>> cr = at91_rtc_read(AT91_RTC_CR);
>> at91_rtc_write(AT91_RTC_CR, cr | AT91_RTC_UPDCAL | AT91_RTC_UPDTIM);
>>
>> - at91_rtc_imr |= AT91_RTC_ACKUPD;
>> at91_rtc_write(AT91_RTC_IER, AT91_RTC_ACKUPD);
>> wait_for_completion(&at91_rtc_updated); /* wait for ACKUPD interrupt */
>> at91_rtc_write(AT91_RTC_IDR, AT91_RTC_ACKUPD);
>> - at91_rtc_imr &= ~AT91_RTC_ACKUPD;
>>
>> at91_rtc_write(AT91_RTC_TIMR,
>> bin2bcd(tm->tm_sec) << 0
>> @@ -145,7 +142,7 @@ static int at91_rtc_readalarm(struct device *dev, struct rtc_wkalrm *alrm)
>> tm->tm_yday = rtc_year_days(tm->tm_mday, tm->tm_mon, tm->tm_year);
>> tm->tm_year = at91_alarm_year - 1900;
>>
>> - alrm->enabled = (at91_rtc_imr & AT91_RTC_ALARM)
>> + alrm->enabled = (at91_rtc_read(AT91_RTC_IMR) & AT91_RTC_ALARM)
>> ? 1 : 0;
>>
>> dev_dbg(dev, "%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __func__,
>> @@ -171,7 +168,6 @@ static int at91_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
>> tm.tm_sec = alrm->time.tm_sec;
>>
>> at91_rtc_write(AT91_RTC_IDR, AT91_RTC_ALARM);
>> - at91_rtc_imr &= ~AT91_RTC_ALARM;
>> at91_rtc_write(AT91_RTC_TIMALR,
>> bin2bcd(tm.tm_sec) << 0
>> | bin2bcd(tm.tm_min) << 8
>> @@ -184,7 +180,6 @@ static int at91_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
>>
>> if (alrm->enabled) {
>> at91_rtc_write(AT91_RTC_SCCR, AT91_RTC_ALARM);
>> - at91_rtc_imr |= AT91_RTC_ALARM;
>> at91_rtc_write(AT91_RTC_IER, AT91_RTC_ALARM);
>> }
>>
>> @@ -201,12 +196,9 @@ static int at91_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
>>
>> if (enabled) {
>> at91_rtc_write(AT91_RTC_SCCR, AT91_RTC_ALARM);
>> - at91_rtc_imr |= AT91_RTC_ALARM;
>> at91_rtc_write(AT91_RTC_IER, AT91_RTC_ALARM);
>> - } else {
>> + } else
>> at91_rtc_write(AT91_RTC_IDR, AT91_RTC_ALARM);
>> - at91_rtc_imr &= ~AT91_RTC_ALARM;
>> - }
>>
>> return 0;
>> }
>> @@ -215,10 +207,12 @@ static int at91_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
>> */
>> static int at91_rtc_proc(struct device *dev, struct seq_file *seq)
>> {
>> + unsigned long imr = at91_rtc_read(AT91_RTC_IMR);
>> +
>> seq_printf(seq, "update_IRQ\t: %s\n",
>> - (at91_rtc_imr & AT91_RTC_ACKUPD) ? "yes" : "no");
>> + (imr & AT91_RTC_ACKUPD) ? "yes" : "no");
>> seq_printf(seq, "periodic_IRQ\t: %s\n",
>> - (at91_rtc_imr & AT91_RTC_SECEV) ? "yes" : "no");
>> + (imr & AT91_RTC_SECEV) ? "yes" : "no");
>>
>> return 0;
>> }
>> @@ -233,7 +227,7 @@ static irqreturn_t at91_rtc_interrupt(int irq, void *dev_id)
>> unsigned int rtsr;
>> unsigned long events = 0;
>>
>> - rtsr = at91_rtc_read(AT91_RTC_SR) & at91_rtc_imr;
>> + rtsr = at91_rtc_read(AT91_RTC_SR) & at91_rtc_read(AT91_RTC_IMR);
>> if (rtsr) { /* this interrupt is shared! Is it ours? */
>> if (rtsr & AT91_RTC_ALARM)
>> events |= (RTC_AF | RTC_IRQF);
>> @@ -297,7 +291,6 @@ static int __init at91_rtc_probe(struct platform_device *pdev)
>> at91_rtc_write(AT91_RTC_IDR, AT91_RTC_ACKUPD | AT91_RTC_ALARM |
>> AT91_RTC_SECEV | AT91_RTC_TIMEV |
>> AT91_RTC_CALEV);
>> - at91_rtc_imr = 0;
>>
>> ret = request_irq(irq, at91_rtc_interrupt,
>> IRQF_SHARED,
>> @@ -336,7 +329,6 @@ static int __exit at91_rtc_remove(struct platform_device *pdev)
>> at91_rtc_write(AT91_RTC_IDR, AT91_RTC_ACKUPD | AT91_RTC_ALARM |
>> AT91_RTC_SECEV | AT91_RTC_TIMEV |
>> AT91_RTC_CALEV);
>> - at91_rtc_imr = 0;
>> free_irq(irq, pdev);
>>
>> rtc_device_unregister(rtc);
>> @@ -349,35 +341,31 @@ static int __exit at91_rtc_remove(struct platform_device *pdev)
>>
>> /* AT91RM9200 RTC Power management control */
>>
>> -static u32 at91_rtc_bkpimr;
>> -
>> +static u32 at91_rtc_imr;
>>
>> static int at91_rtc_suspend(struct device *dev)
>> {
>> /* this IRQ is shared with DBGU and other hardware which isn't
>> * necessarily doing PM like we are...
>> */
>> - at91_rtc_bkpimr = at91_rtc_imr & (AT91_RTC_ALARM|AT91_RTC_SECEV);
>> - if (at91_rtc_bkpimr) {
>> - if (device_may_wakeup(dev)) {
>> + at91_rtc_imr = at91_rtc_read(AT91_RTC_IMR)
>> + & (AT91_RTC_ALARM|AT91_RTC_SECEV);
>> + if (at91_rtc_imr) {
>> + if (device_may_wakeup(dev))
>> enable_irq_wake(irq);
>> - } else {
>> - at91_rtc_write(AT91_RTC_IDR, at91_rtc_bkpimr);
>> - at91_rtc_imr &= ~at91_rtc_bkpimr;
>> - }
>> -}
>> + else
>> + at91_rtc_write(AT91_RTC_IDR, at91_rtc_imr);
>> + }
>> return 0;
>> }
>>
>> static int at91_rtc_resume(struct device *dev)
>> {
>> - if (at91_rtc_bkpimr) {
>> - if (device_may_wakeup(dev)) {
>> + if (at91_rtc_imr) {
>> + if (device_may_wakeup(dev))
>> disable_irq_wake(irq);
>> - } else {
>> - at91_rtc_imr |= at91_rtc_bkpimr;
>> - at91_rtc_write(AT91_RTC_IER, at91_rtc_bkpimr);
>> - }
>> + else
>> + at91_rtc_write(AT91_RTC_IER, at91_rtc_imr);
>> }
>> return 0;
>> }
>> diff --git a/drivers/rtc/rtc-at91rm9200.h b/drivers/rtc/rtc-at91rm9200.h
>> index 5f940b6..da1945e 100644
>> --- a/drivers/rtc/rtc-at91rm9200.h
>> +++ b/drivers/rtc/rtc-at91rm9200.h
>> @@ -64,6 +64,7 @@
>> #define AT91_RTC_SCCR 0x1c /* Status Clear Command Register */
>> #define AT91_RTC_IER 0x20 /* Interrupt Enable Register */
>> #define AT91_RTC_IDR 0x24 /* Interrupt Disable Register */
>> +#define AT91_RTC_IMR 0x28 /* Interrupt Mask Register */
>>
>> #define AT91_RTC_VER 0x2c /* Valid Entry Register */
>> #define AT91_RTC_NVTIM (1 << 0) /* Non valid Time */
>>
>
>
--
Nicolas Ferre
--
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