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mmc: rtsx_pci_sdmmc: implement sdmmc_card_busy function

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rtsx_pci_sdmmc does not have an sdmmc_card_busy function, so any voltage
switches cause a kernel warning, "mmc0: cannot verify signal voltage
switch."

Copy the sdmmc_card_busy function from rtsx_pci_usb to rtsx_pci_sdmmc to
fix this.

Fixes: ff984e57d3 ("mmc: Add realtek pcie sdmmc host driver")
Signed-off-by: Matthew Schwartz <matthew.schwartz@linux.dev>
Tested-by: Ricky WU <ricky_wu@realtek.com>
Reviewed-by: Ricky WU <ricky_wu@realtek.com>
Cc: stable@vger.kernel.org
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Matthew Schwartz 2025-12-29 12:45:26 -08:00 committed by Ulf Hansson
parent 3009738a85
commit 1226102201
1 changed files with 41 additions and 0 deletions
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41
drivers/mmc/host/rtsx_pci_sdmmc.c
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@ -1306,6 +1306,46 @@ static int sdmmc_switch_voltage(struct mmc_host *mmc, struct mmc_ios *ios)
return err;
}
static int sdmmc_card_busy(struct mmc_host *mmc)
{
struct realtek_pci_sdmmc *host = mmc_priv(mmc);
struct rtsx_pcr *pcr = host->pcr;
int err;
u8 stat;
u8 mask = SD_DAT3_STATUS | SD_DAT2_STATUS | SD_DAT1_STATUS
| SD_DAT0_STATUS;
mutex_lock(&pcr->pcr_mutex);
rtsx_pci_start_run(pcr);
err = rtsx_pci_write_register(pcr, SD_BUS_STAT,
SD_CLK_TOGGLE_EN | SD_CLK_FORCE_STOP,
SD_CLK_TOGGLE_EN);
if (err)
goto out;
mdelay(1);
err = rtsx_pci_read_register(pcr, SD_BUS_STAT, &stat);
if (err)
goto out;
err = rtsx_pci_write_register(pcr, SD_BUS_STAT,
SD_CLK_TOGGLE_EN | SD_CLK_FORCE_STOP, 0);
out:
mutex_unlock(&pcr->pcr_mutex);
if (err)
return err;
/* check if any pin between dat[0:3] is low */
if ((stat & mask) != mask)
return 1;
else
return 0;
}
static int sdmmc_execute_tuning(struct mmc_host *mmc, u32 opcode)
{
struct realtek_pci_sdmmc *host = mmc_priv(mmc);
@ -1418,6 +1458,7 @@ static const struct mmc_host_ops realtek_pci_sdmmc_ops = {
.get_ro = sdmmc_get_ro,
.get_cd = sdmmc_get_cd,
.start_signal_voltage_switch = sdmmc_switch_voltage,
.card_busy = sdmmc_card_busy,
.execute_tuning = sdmmc_execute_tuning,
.init_sd_express = sdmmc_init_sd_express,
};