8-bit mode is not supported by SD cards and on P2020 are four SDHC pins
shared with SPI (so if P2020 board have also SPI then only 4-bit SDHC mode
is provided). So 8-bit SDHC mode is really bad default.
When max bus width is not provided then set mode to 1-bit. This mode is
supported by all cards, so it is the best option for fallback mode.
Also P2020 bootrom sets mode to 1-bit when booting from SD/MMC card.
Signed-off-by: Pali Rohár <p...@kernel.org>
---
drivers/mmc/fsl_esdhc.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)
diff --git a/drivers/mmc/fsl_esdhc.c b/drivers/mmc/fsl_esdhc.c
index 3b3587bd8d72..834f8933b0c6 100644
--- a/drivers/mmc/fsl_esdhc.c
+++ b/drivers/mmc/fsl_esdhc.c
@@ -963,9 +963,8 @@ int fsl_esdhc_initialize(struct bd_info *bis, struct
fsl_esdhc_cfg *cfg)
} else if (cfg->max_bus_width == 1) {
mmc_cfg->host_caps |= MMC_MODE_1BIT;
} else {
- mmc_cfg->host_caps |= MMC_MODE_1BIT | MMC_MODE_4BIT |
- MMC_MODE_8BIT;
- printf("No max bus width provided. Assume 8-bit supported.\n");
+ mmc_cfg->host_caps |= MMC_MODE_1BIT;
+ printf("No max bus width provided. Fallback to 1-bit mode.\n");
}
if (IS_ENABLED(CONFIG_ESDHC_DETECT_8_BIT_QUIRK))
--
2.20.1
