4.14-stable review patch. If anyone has any objections, please let me know.
------------------ From: Stefan Agner <ste...@agner.ch> commit 92748beac07c471d995fbec642b63572dc01b3dc upstream. If pinctrl nodes for 100/200MHz are missing, the controller should not select any mode which need signal frequencies 100MHz or higher. To prevent such speed modes the driver currently uses the quirk flag SDHCI_QUIRK2_NO_1_8_V. This works nicely for SD cards since 1.8V signaling is required for all faster modes and slower modes use 3.3V signaling only. However, there are eMMC modes which use 1.8V signaling and run below 100MHz, e.g. DDR52 at 1.8V. With using SDHCI_QUIRK2_NO_1_8_V this mode is prevented. When using a fixed 1.8V regulator as vqmmc-supply the stack has no valid mode to use. In this tenuous situation the kernel continuously prints voltage switching errors: mmc1: Switching to 3.3V signalling voltage failed Avoid using SDHCI_QUIRK2_NO_1_8_V and prevent faster modes by altering the SDHCI capability register. With that the stack is able to select 1.8V modes even if no faster pinctrl states are available: # cat /sys/kernel/debug/mmc1/ios ... timing spec: 8 (mmc DDR52) signal voltage: 1 (1.80 V) ... Link: http://lkml.kernel.org/r/20180628081331.13051-1-ste...@agner.ch Signed-off-by: Stefan Agner <ste...@agner.ch> Fixes: ad93220de7da ("mmc: sdhci-esdhc-imx: change pinctrl state according to uhs mode") Cc: <sta...@vger.kernel.org> # v4.13+ Signed-off-by: Ulf Hansson <ulf.hans...@linaro.org> Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org> --- drivers/mmc/host/sdhci-esdhc-imx.c | 21 +++++++++------------ 1 file changed, 9 insertions(+), 12 deletions(-) --- a/drivers/mmc/host/sdhci-esdhc-imx.c +++ b/drivers/mmc/host/sdhci-esdhc-imx.c @@ -305,6 +305,15 @@ static u32 esdhc_readl_le(struct sdhci_h if (imx_data->socdata->flags & ESDHC_FLAG_HS400) val |= SDHCI_SUPPORT_HS400; + + /* + * Do not advertise faster UHS modes if there are no + * pinctrl states for 100MHz/200MHz. + */ + if (IS_ERR_OR_NULL(imx_data->pins_100mhz) || + IS_ERR_OR_NULL(imx_data->pins_200mhz)) + val &= ~(SDHCI_SUPPORT_SDR50 | SDHCI_SUPPORT_DDR50 + | SDHCI_SUPPORT_SDR104 | SDHCI_SUPPORT_HS400); } } @@ -1135,18 +1144,6 @@ sdhci_esdhc_imx_probe_dt(struct platform ESDHC_PINCTRL_STATE_100MHZ); imx_data->pins_200mhz = pinctrl_lookup_state(imx_data->pinctrl, ESDHC_PINCTRL_STATE_200MHZ); - if (IS_ERR(imx_data->pins_100mhz) || - IS_ERR(imx_data->pins_200mhz)) { - dev_warn(mmc_dev(host->mmc), - "could not get ultra high speed state, work on normal mode\n"); - /* - * fall back to not supporting uhs by specifying no - * 1.8v quirk - */ - host->quirks2 |= SDHCI_QUIRK2_NO_1_8_V; - } - } else { - host->quirks2 |= SDHCI_QUIRK2_NO_1_8_V; } /* call to generic mmc_of_parse to support additional capabilities */
