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mmc: dw_mmc: Allow use of in-spec voltage range for vqmmc-supply

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The Rockchip RK3399 SoC SDMMC IO domain supports 1.8V and 3.0V mode, and
the 3.0V mode is within SD Standards allowed 2.7V-3.6V range. However,
the commit 0b75109b6a ("mmc: dw_mmc: return error for invalid voltage
setting") help enforce strict 1.8V and 3.3V when setting vqmmc-supply
making mmc_set_signal_voltage() now fail for MMC_SIGNAL_VOLTAGE_330 and
leading to an improper switch to MMC_SIGNAL_VOLTAGE_180.

Use regulator_set_value_clamp() to set an SD Standards voltage range,
1.70V-1.95V and 2.7V-3.6V, I/O voltage instead of requiring an exact
regulator value to closer match Linux and to fix use of 3.3V signal
voltage on Rockchip RK3399 boards using MMC_IO_VOLTAGE=y.

Fixes: 0b75109b6a ("mmc: dw_mmc: return error for invalid voltage setting")
Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
This commit is contained in:
Jonas Karlman
2026-07-12 16:18:32 +08:00
committed by Peng Fan
parent 10acd5bc9a
commit 9118fc77f0
1 changed files with 4 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files
drivers/mmc/dw_mmc.c
+4 -2
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@@ -645,9 +645,11 @@ static int dwmci_set_ios(struct mmc *mmc)
int ret;
if (mmc->signal_voltage == MMC_SIGNAL_VOLTAGE_180)
ret = regulator_set_value(mmc->vqmmc_supply, 1800000);
ret = regulator_set_value_clamp(mmc->vqmmc_supply,
1700000, 1800000, 1950000);
else
ret = regulator_set_value(mmc->vqmmc_supply, 3300000);
ret = regulator_set_value_clamp(mmc->vqmmc_supply,
2700000, 3300000, 3600000);
if (ret && ret != -ENOSYS)
return ret;
}