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mmc: tmio: Simplify pinmux handling

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The SD UHS SDR12, SDR25, SDR50, SDR104, DDR50 and MMC HS200, HS400
modes all use 1.8V signaling, while all the legacy modes use 3.3V
signaling. While there are extra modes which use 1.2V signaling,
the existing hardware does not support those.

Simplify the pinmux such that 3.3V signaling implies legacy mode
pinmux and the rest implies UHS mode pinmux. This prevents the
massive case statement from growing further. Moreover, it fixes
an edge case where during SD 1.8V switch, the bus mode is still
set to default while the signaling is already set to 1.8V, which
results in an attempt to communicate with a 1.8V card using pins
in 3.3V mode and thus communication failure.

Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
This commit is contained in:
Marek Vasut 2018-10-28 13:54:10 +01:00 committed by Marek Vasut
parent e5cb6bd9a2
commit 645a575aeb
1 changed files with 3 additions and 19 deletions
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22
drivers/mmc/tmio-common.c
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@ -622,26 +622,10 @@ static void tmio_sd_set_pins(struct udevice *dev)
#endif
#ifdef CONFIG_PINCTRL
switch (mmc->selected_mode) {
case MMC_LEGACY:
case SD_LEGACY:
case MMC_HS:
case SD_HS:
case MMC_HS_52:
case MMC_DDR_52:
pinctrl_select_state(dev, "default");
break;
case UHS_SDR12:
case UHS_SDR25:
case UHS_SDR50:
case UHS_DDR50:
case UHS_SDR104:
case MMC_HS_200:
if (mmc->signal_voltage == MMC_SIGNAL_VOLTAGE_180)
pinctrl_select_state(dev, "state_uhs");
break;
default:
break;
}
else
pinctrl_select_state(dev, "default");
#endif
}