From f722e650d965307f8c4c24cf4edc166b6abe9dc6 Mon Sep 17 00:00:00 2001 From: Lucas Stach Date: Mon, 10 May 2021 21:04:00 +0200 Subject: [PATCH] mmc: core: add support for disabling HS400 mode via DT On some boards the data strobe line isn't wired up, rendering HS400 support broken, even if both the controller and the eMMC claim to support it. Allow to disable HS400 mode via DT. Signed-off-by: Lucas Stach Link: https://lore.kernel.org/r/20210510190400.105162-3-l.stach@pengutronix.de Signed-off-by: Ulf Hansson --- drivers/mmc/core/host.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/mmc/core/host.c b/drivers/mmc/core/host.c index 0b0577990ddc9..eda4a1892c33c 100644 --- a/drivers/mmc/core/host.c +++ b/drivers/mmc/core/host.c @@ -388,6 +388,9 @@ int mmc_of_parse(struct mmc_host *host) host->caps2 |= MMC_CAP2_NO_SD; if (device_property_read_bool(dev, "no-mmc")) host->caps2 |= MMC_CAP2_NO_MMC; + if (device_property_read_bool(dev, "no-mmc-hs400")) + host->caps2 &= ~(MMC_CAP2_HS400_1_8V | MMC_CAP2_HS400_1_2V | + MMC_CAP2_HS400_ES); /* Must be after "non-removable" check */ if (device_property_read_u32(dev, "fixed-emmc-driver-type", &drv_type) == 0) { -- 2.30.2