Messages in this thread Patch in this message | | | From | Yann Gautier <> | Subject | [PATCH] mmc: mmci: stm32: check when the voltage switch procedure should be done | Date | Thu, 1 Jul 2021 16:33:53 +0200 |
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From: Christophe Kerello <christophe.kerello@foss.st.com>
If the card has not been power cycled, it may still be using 1.8V signaling. This situation is detected in mmc_sd_init_card function and should be handled in mmci stm32 variant. The host->pwr_reg variable is also correctly protected with spin locks.
Fixes: 94b94a93e355 ("mmc: mmci_sdmmc: Implement signal voltage callbacks")
Signed-off-by: Christophe Kerello <christophe.kerello@foss.st.com> Signed-off-by: Yann Gautier <yann.gautier@foss.st.com> --- drivers/mmc/host/mmci_stm32_sdmmc.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/drivers/mmc/host/mmci_stm32_sdmmc.c b/drivers/mmc/host/mmci_stm32_sdmmc.c index 51db30acf4dc..fdaa11f92fe6 100644 --- a/drivers/mmc/host/mmci_stm32_sdmmc.c +++ b/drivers/mmc/host/mmci_stm32_sdmmc.c @@ -479,8 +479,9 @@ static int sdmmc_post_sig_volt_switch(struct mmci_host *host, u32 status; int ret = 0; - if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_180) { - spin_lock_irqsave(&host->lock, flags); + spin_lock_irqsave(&host->lock, flags); + if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_180 && + host->pwr_reg & MCI_STM32_VSWITCHEN) { mmci_write_pwrreg(host, host->pwr_reg | MCI_STM32_VSWITCH); spin_unlock_irqrestore(&host->lock, flags); @@ -492,9 +493,11 @@ static int sdmmc_post_sig_volt_switch(struct mmci_host *host, writel_relaxed(MCI_STM32_VSWENDC | MCI_STM32_CKSTOPC, host->base + MMCICLEAR); + spin_lock_irqsave(&host->lock, flags); mmci_write_pwrreg(host, host->pwr_reg & ~(MCI_STM32_VSWITCHEN | MCI_STM32_VSWITCH)); } + spin_unlock_irqrestore(&host->lock, flags); return ret; } -- 2.17.1
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