mmc: core: add support for disabling HS400 mode via DT

Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git

kernel os linux

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@lynxeye.de>
Link: https://lore.kernel.org/r/20210510190400.105162-3-l.stach@pengutronix.de
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

authored by

Lucas Stach and committed by

Ulf Hansson 4 years ago f722e650 2991ad76

1 changed file

expand all

drivers

mmc

core

host.c

drivers/mmc/core/host.c

··· 388 388 host->caps2 |= MMC_CAP2_NO_SD; 389 389 if (device_property_read_bool(dev, "no-mmc")) 390 390 host->caps2 |= MMC_CAP2_NO_MMC; 391 + if (device_property_read_bool(dev, "no-mmc-hs400")) 392 + host->caps2 &= ~(MMC_CAP2_HS400_1_8V | MMC_CAP2_HS400_1_2V | 393 + MMC_CAP2_HS400_ES); 391 394 392 395 /* Must be after "non-removable" check */ 393 396 if (device_property_read_u32(dev, "fixed-emmc-driver-type", &drv_type) == 0) {