[PATCH 3/3] mmc: fsl_esdhc_spl: Call mmc_init() before booting from SD card

["Pali Rohár" <pali@kernel.org>]

If env is stored on SD card then U-Boot SPL automatically calls mmc_init()
before it is going to load proper U-Boot from SD card.

If env is not stored on SD card then U-Boot SPL fails to read proper U-Boot
from SD card due to missing mmc_init() call.

So add missing mmc_init() call into fsl_esdhc_spl's mmc_boot() function.
It fixes booting from SD card on P2020 boards without env support in SPL.

mmc_init() returns early if card was already initialized, so there is no
issue with calling this function more times.

Signed-off-by: Pali Rohár <pali@kernel.org>
---
 drivers/mmc/fsl_esdhc_spl.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/mmc/fsl_esdhc_spl.c b/drivers/mmc/fsl_esdhc_spl.c
index b87597a88e1d..0146a231b221 100644
--- a/drivers/mmc/fsl_esdhc_spl.c
+++ b/drivers/mmc/fsl_esdhc_spl.c
@@ -77,6 +77,11 @@ void __noreturn mmc_boot(void)
 		hang();
 	}
 
+	if (mmc_init(mmc)) {
+		puts("spl: mmc device init failed!\n");
+		hang();
+	}
+
 #ifdef CONFIG_FSL_CORENET
 	offset = CONFIG_SYS_MMC_U_BOOT_OFFS;
 #else
-- 
2.20.1