[PATCH 5.13 087/127] mmc: mmci: stm32: Check when the voltage switch procedure should be done

Sasha Levin
2021-08-24T17:01:54Z

From: Christophe Kerello <christophe.kerello@foss.st.com>

[ Upstream commit d8e193f13b07e6c0ffaa1a999386f1989f2b4c5e ]

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>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20210701143353.13188-1-yann.gautier@foss.st.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
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;
}
--
2.30.2