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rtc: omap: Cut down the shutdown time from 2 seconds to 1 sec 

Cut down the shutdown time from 2 seconds to 1 sec. In case of roll
over try again.

Signed-off-by: Keerthy <j-keerthy@ti.com>
Reviewed-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
This commit is contained in:
Keerthy 2018-08-16 10:39:00 +05:30 committed by Alexandre Belloni
parent 0438002ac5
commit 09058eab4b
1 changed files with 15 additions and 10 deletions
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25
drivers/rtc/rtc-omap.c
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@ -421,12 +421,6 @@ static struct omap_rtc *omap_rtc_power_off_rtc;
* The RTC can be used to control an external PMIC via the pmic_power_en pin,
* which can be configured to transition to OFF on ALARM2 events.
*
* Notes:
* The two-second alarm offset is the shortest offset possible as the alarm
* registers must be set before the next timer update and the offset
* calculation is too heavy for everything to be done within a single access
* period (~15 us).
*
* Called with local interrupts disabled.
*/
static void omap_rtc_power_off(void)
@ -434,6 +428,7 @@ static void omap_rtc_power_off(void)
struct omap_rtc *rtc = omap_rtc_power_off_rtc;
struct rtc_time tm;
unsigned long now;
int seconds;
u32 val;
rtc->type->unlock(rtc);
@ -441,11 +436,13 @@ static void omap_rtc_power_off(void)
val = rtc_readl(rtc, OMAP_RTC_PMIC_REG);
rtc_writel(rtc, OMAP_RTC_PMIC_REG, val | OMAP_RTC_PMIC_POWER_EN_EN);
/* set alarm two seconds from now */
again:
/* set alarm one second from now */
omap_rtc_read_time_raw(rtc, &tm);
seconds = tm.tm_sec;
bcd2tm(&tm);
rtc_tm_to_time(&tm, &now);
rtc_time_to_tm(now + 2, &tm);
rtc_time_to_tm(now + 1, &tm);
if (tm2bcd(&tm) < 0) {
dev_err(&rtc->rtc->dev, "power off failed\n");
@ -470,14 +467,22 @@ static void omap_rtc_power_off(void)
val = rtc_read(rtc, OMAP_RTC_INTERRUPTS_REG);
rtc_writel(rtc, OMAP_RTC_INTERRUPTS_REG,
val | OMAP_RTC_INTERRUPTS_IT_ALARM2);
/* Retry in case roll over happened before alarm was armed. */
if (rtc_read(rtc, OMAP_RTC_SECONDS_REG) != seconds) {
val = rtc_read(rtc, OMAP_RTC_STATUS_REG);
if (!(val & OMAP_RTC_STATUS_ALARM2))
goto again;
}
rtc->type->lock(rtc);
/*
* Wait for alarm to trigger (within two seconds) and external PMIC to
* Wait for alarm to trigger (within one second) and external PMIC to
* power off the system. Add a 500 ms margin for external latencies
* (e.g. debounce circuits).
*/
mdelay(2500);
mdelay(1500);
}
static const struct rtc_class_ops omap_rtc_ops = {