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mmc: sdhci: disable the 8bit mode when host doesn't support it

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Buswidth is depeneded on Hardware schematic.
Evne though host can support the 8bit buswidth, if hardware doesn't
support 8bit mode, it doesn't work fine.
So the buswidth mode selection leaves a matter in each SoC drivers.

On the contrary to this, hardware supports 8bit mode, but host doesn't
support it. then controller has to disable the MMC_MODE_8BIT.
(Host can check whether 8bit mode is supported or not, since V3.0)

Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
This commit is contained in:
Jaehoon Chung 2016-12-30 15:30:11 +09:00
parent 04770e6e91
commit ecd7b246f6
1 changed files with 2 additions and 3 deletions
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5
drivers/mmc/sdhci.c
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@ -594,14 +594,13 @@ int sdhci_setup_cfg(struct mmc_config *cfg, struct sdhci_host *host,
cfg->host_caps = MMC_MODE_HS | MMC_MODE_HS_52MHz | MMC_MODE_4BIT;
if (SDHCI_GET_VERSION(host) >= SDHCI_SPEC_300) {
if (caps & SDHCI_CAN_DO_8BIT)
cfg->host_caps |= MMC_MODE_8BIT;
if (!(caps & SDHCI_CAN_DO_8BIT))
cfg->host_caps &= ~MMC_MODE_8BIT;
}
if (host->host_caps)
cfg->host_caps |= host->host_caps;
cfg->b_max = CONFIG_SYS_MMC_MAX_BLK_COUNT;
/*