[PATCH] mmc: mmci: stm32: handle mmc power up

[Marek Vasut]

From: Christophe Kerello <christophe.kerello@xxxxxxxxxxx>

Manage MMC POWER UP state like MMC POWER OFF state. In case of low
power use cases, it will avoid random initialization timeout. This
fixes a failure to switch DDR52 eMMC to 8 bit mode due to -EILSEQ
returned from mmc_get_ext_csd() in mmc_compare_ext_csds() called
from mmc_select_bus_width() after Standby1 suspend/resume cycle.

Fixes: 46b723dd867d ("mmc: mmci: add stm32 sdmmc variant")
Signed-off-by: Christophe Kerello <christophe.kerello@xxxxxxxxxxx>
Signed-off-by: Marek Vasut <marex@xxxxxxxxxxxx>
---
Cc: Alexandre Torgue <alexandre.torgue@xxxxxxxxxxx>
Cc: Christophe Kerello <christophe.kerello@xxxxxxxxxxx>
Cc: Maxime Coquelin <mcoquelin.stm32@xxxxxxxxx>
Cc: Ulf Hansson <ulfh@xxxxxxxxxx>
Cc: kernel@xxxxxxxxxxxxxxxxxx
Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
Cc: linux-mmc@xxxxxxxxxxxxxxx
Cc: linux-stm32@xxxxxxxxxxxxxxxxxxxxxxxxxxxx
---
Marek: Update commit message
---
 drivers/mmc/host/mmci_stm32_sdmmc.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/mmc/host/mmci_stm32_sdmmc.c b/drivers/mmc/host/mmci_stm32_sdmmc.c
index 9dc51859c2e51..659a5040729e9 100644
--- a/drivers/mmc/host/mmci_stm32_sdmmc.c
+++ b/drivers/mmc/host/mmci_stm32_sdmmc.c
@@ -368,7 +368,8 @@ static void mmci_sdmmc_set_pwrreg(struct mmci_host *host, unsigned int pwr)
 	if (dlyb && dlyb->ops->set_input_ck)
 		dlyb->ops->set_input_ck(dlyb);
 
-	if (ios.power_mode == MMC_POWER_OFF) {
+	if (ios.power_mode == MMC_POWER_OFF ||
+	    ios.power_mode == MMC_POWER_UP) {
 		/* Only a reset could power-off sdmmc */
 		reset_control_assert(host->rst);
 		udelay(2);
-- 
2.53.0