[PATCH v2 3/3] mmc: core: add support for disabling HS400 mode via DT

[Lucas Stach]

From: Lucas Stach <dev at lynxeye.de>

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 <dev at lynxeye.de>
---
v2:
- move to core
- actually disable all HS400 modes
---
 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 9b89a91b6b47..0e066c5f5243 100644
--- a/drivers/mmc/core/host.c
+++ b/drivers/mmc/core/host.c
@@ -351,6 +351,9 @@ 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) {
-- 
2.31.1