On Thu, Nov 1, 2018 at 9:14 PM Marek Vasut marek.vasut@gmail.com wrote:
On 11/01/2018 12:38 PM, Masahiro Yamada wrote:
On Thu, Nov 1, 2018 at 2:21 AM Marek Vasut marek.vasut@gmail.com wrote:
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
drivers/mmc/tmio-common.c | 22 +++------------------- 1 file changed, 3 insertions(+), 19 deletions(-)
diff --git a/drivers/mmc/tmio-common.c b/drivers/mmc/tmio-common.c index 138de59470..5f927c6150 100644 --- a/drivers/mmc/tmio-common.c +++ b/drivers/mmc/tmio-common.c @@ -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;}
elsepinctrl_select_state(dev, "default");#endif }
Looks a nice clean-up although the current code is already screwed up, I guess.
"state_uhs" is Renesas-specific DT binding while it is sitting in the common code.
Is there any socionext device which supports 1V8 signaling with this core ?
Yes.