Commit 4ff6471c authored by Pierre Ossman's avatar Pierre Ossman

sdio: enable wide bus mode

Enable 4-bit data bus mode, according to host and card
capabilities.
Signed-off-by: default avatarPierre Ossman <drzeus@drzeus.cx>
parent 6db5020e
......@@ -138,6 +138,32 @@ static int sdio_read_cccr(struct mmc_card *card)
return ret;
}
static int sdio_enable_wide(struct mmc_card *card)
{
int ret;
u8 ctrl;
if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
return 0;
if (card->cccr.low_speed && !card->cccr.wide_bus)
return 0;
ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
if (ret)
return ret;
ctrl |= SDIO_BUS_WIDTH_4BIT;
ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
if (ret)
return ret;
mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
return 0;
}
/*
* Host is being removed. Free up the current card.
*/
......@@ -299,6 +325,13 @@ int mmc_attach_sdio(struct mmc_host *host, u32 ocr)
*/
mmc_set_clock(host, card->cis.max_dtr);
/*
* Switch to wider bus (if supported).
*/
err = sdio_enable_wide(card);
if (err)
goto remove;
/*
* Initialize (but don't add) all present functions.
*/
......
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