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Commit 340bb103 authored by Mohit Aggarwal's avatar Mohit Aggarwal Committed by Gerrit - the friendly Code Review server
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rtc-pm8xxx: Fix issue in RTC write path 



In order to set time in rtc, need to disable
rtc hw before writing into rtc registers.

Also fixes disabling of alarm while setting
rtc time.

Change-Id: I0ffad7b6dcba5fea510d5acfad82ed328cffcf84
Signed-off-by: default avatarMohit Aggarwal <maggarwa@codeaurora.org>
parent d94ac719

drivers/rtc/rtc-pm8xxx.c

+38 −11
Original line number Diff line number Diff line
@@ -74,16 +74,18 @@ struct pm8xxx_rtc { 
/*

 * Steps to write the RTC registers.

 * 1. Disable alarm if enabled.

 * 2. Write 0x00 to LSB.

 * 3. Write Byte[1], Byte[2], Byte[3] then Byte[0].

 * 4. Enable alarm if disabled in step 1.

 * 2. Disable rtc if enabled.

 * 3. Write 0x00 to LSB.

 * 4. Write Byte[1], Byte[2], Byte[3] then Byte[0].

 * 5. Enable rtc if disabled in step 2.

 * 6. Enable alarm if disabled in step 1.

 */

static int pm8xxx_rtc_set_time(struct device *dev, struct rtc_time *tm)

{

	int rc, i;

	unsigned long secs, irq_flags;

	u8 value[NUM_8_BIT_RTC_REGS], alarm_enabled = 0;

	unsigned int ctrl_reg;

	u8 value[NUM_8_BIT_RTC_REGS], alarm_enabled = 0, rtc_disabled = 0;

	unsigned int ctrl_reg, rtc_ctrl_reg;

	struct pm8xxx_rtc *rtc_dd = dev_get_drvdata(dev);

	const struct pm8xxx_rtc_regs *regs = rtc_dd->regs;
@@ -92,23 +94,38 @@ static int pm8xxx_rtc_set_time(struct device *dev, struct rtc_time *tm) 


	rtc_tm_to_time(tm, &secs);



	dev_dbg(dev, "Seconds value to be written to RTC = %lu\n", secs);



	for (i = 0; i < NUM_8_BIT_RTC_REGS; i++) {

		value[i] = secs & 0xFF;

		secs >>= 8;

	}



	dev_dbg(dev, "Seconds value to be written to RTC = %lu\n", secs);



	spin_lock_irqsave(&rtc_dd->ctrl_reg_lock, irq_flags);



	rc = regmap_read(rtc_dd->regmap, regs->ctrl, &ctrl_reg);

	rc = regmap_read(rtc_dd->regmap, regs->alarm_ctrl, &ctrl_reg);

	if (rc)

		goto rtc_rw_fail;



	if (ctrl_reg & regs->alarm_en) {

		alarm_enabled = 1;

		ctrl_reg &= ~regs->alarm_en;

		rc = regmap_write(rtc_dd->regmap, regs->ctrl, ctrl_reg);

		rc = regmap_write(rtc_dd->regmap, regs->alarm_ctrl, ctrl_reg);

		if (rc) {

			dev_err(dev, "Write to RTC Alarm control register failed\n");

			goto rtc_rw_fail;

		}

	}



	/* Disable RTC H/w before writing on RTC register */

	rc = regmap_read(rtc_dd->regmap, regs->ctrl, &rtc_ctrl_reg);

	if (rc)

		goto rtc_rw_fail;



	if (rtc_ctrl_reg & PM8xxx_RTC_ENABLE) {

		rtc_disabled = 1;

		rtc_ctrl_reg &= ~PM8xxx_RTC_ENABLE;

		rc = regmap_write(rtc_dd->regmap, regs->ctrl, rtc_ctrl_reg);

		if (rc) {

			dev_err(dev, "Write to RTC control register failed\n");

			goto rtc_rw_fail;
@@ -137,11 +154,21 @@ static int pm8xxx_rtc_set_time(struct device *dev, struct rtc_time *tm) 
		goto rtc_rw_fail;

	}



	/* Enable RTC H/w after writing on RTC register */

	if (rtc_disabled) {

		rtc_ctrl_reg |= PM8xxx_RTC_ENABLE;

		rc = regmap_write(rtc_dd->regmap, regs->ctrl, rtc_ctrl_reg);

		if (rc) {

			dev_err(dev, "Write to RTC control register failed\n");

			goto rtc_rw_fail;

		}

	}



	if (alarm_enabled) {

		ctrl_reg |= regs->alarm_en;

		rc = regmap_write(rtc_dd->regmap, regs->ctrl, ctrl_reg);

		rc = regmap_write(rtc_dd->regmap, regs->alarm_ctrl, ctrl_reg);

		if (rc) {

			dev_err(dev, "Write to RTC control register failed\n");

			dev_err(dev, "Write to RTC Alarm control register failed\n");

			goto rtc_rw_fail;

		}

	}