Commit 83220bf3 authored Mar 05, 2018 by Mohit Aggarwal Committed by Alexandre Belloni Mar 17, 2018

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.

Signed-off-by: Mohit Aggarwal <maggarwa@codeaurora.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

parent e22e2d94

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;
		}
		}