regulator: stm32-pwr: Fix regulator disabling
The following shows up in the kernel log on systems using the STM32MP15xx USBPHYC: " regulator regulator.19: regulator disable timed out! reg18: failed to disable: -ETIMEDOUT " This 'regulator.19' is 'pwr@50001000' 'reg18' in stm32mp151.dts DT, or "Power control (PWR)" register "PWR_CR3" bits "REG18" on STM32MP15xx reference manual. The reason for the timeout seems to be the poll which this patch changes. When turning this regulator OFF, PWR_CR3 reads 0xf0000000 , then REG18_EN bit is cleared, and then this poll waits until REG18_RDY bit is cleared as well, but that never happens, the PWR_CR3 keeps reading 0xe0000000 . I am not sure whether this should happen, I suspect the 1V8 supply is always READY when the 1V8 input is present, and the regulator can only ever be enabled/disabled using the REG18_EN bit, but the REG18_READY bit is never cleared again. This patch adjusts the poll to check whether REG18_EN has been cleared on regulator disable, but retains the check for REG18_READY in regulator enable as there it makes sense to verify the regulator is really READY. Signed-off-by: Marek Vasut <marex@denx.de> Link: https://lore.kernel.org/r/20230518023946.530381-1-marex@denx.de Signed-off-by: Mark Brown <broonie@kernel.org>
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@ -93,7 +93,7 @@ static int stm32_pwr_reg_disable(struct regulator_dev *rdev)
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writel_relaxed(val, priv->base + REG_PWR_CR3);
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/* use an arbitrary timeout of 20ms */
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ret = readx_poll_timeout(stm32_pwr_reg_is_ready, rdev, val, !val,
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ret = readx_poll_timeout(stm32_pwr_reg_is_enabled, rdev, val, !val,
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100, 20 * 1000);
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if (ret)
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dev_err(&rdev->dev, "regulator disable timed out!\n");
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