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 --- drivers/mmc/sdhci.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-)
diff --git a/drivers/mmc/sdhci.c b/drivers/mmc/sdhci.c index cbf5f56..853c268 100644 --- a/drivers/mmc/sdhci.c +++ b/drivers/mmc/sdhci.c @@ -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;
/*