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mmc: fsl_esdhc: Set fallback mode to 1-bit 

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 <pali@kernel.org>
Reviewed-by: Jaehoon Chung <jh80.chung@samsung.com>
This commit is contained in:
Pali Rohár 2022-05-11 20:27:12 +02:00 committed by Peng Fan
parent d494806376
commit a29eb319a3
1 changed files with 2 additions and 3 deletions
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5
drivers/mmc/fsl_esdhc.c
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@ -946,9 +946,8 @@ int fsl_esdhc_initialize(struct bd_info *bis, struct fsl_esdhc_cfg *cfg)
} else if (cfg->max_bus_width == 1) { } else if (cfg->max_bus_width == 1) {
mmc_cfg->host_caps |= MMC_MODE_1BIT; mmc_cfg->host_caps |= MMC_MODE_1BIT;
} else { } else {
mmc_cfg->host_caps |= MMC_MODE_1BIT | MMC_MODE_4BIT | mmc_cfg->host_caps |= MMC_MODE_1BIT;
MMC_MODE_8BIT; printf("No max bus width provided. Fallback to 1-bit mode.\n");
printf("No max bus width provided. Assume 8-bit supported.\n");
} }
if (IS_ENABLED(CONFIG_ESDHC_DETECT_8_BIT_QUIRK)) if (IS_ENABLED(CONFIG_ESDHC_DETECT_8_BIT_QUIRK))