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| author |   Anton Vorontsov <avorontsov@ru.mvista.com> | 2009-06-18 00:14:08 +0400 |
|---|---|---|
| committer |   Pierre Ossman <pierre@ossman.eu> | 2009-06-21 21:00:59 +0200 |
| commit | 5fe23c7f51def59f66bc6aeee988ef1a467a2c8c (patch) | |
| tree | 6d10aa3966cf105a8c6d6b758660fa6f00a49896 /drivers/mmc/host/sdhci.c | |
| parent | MAINTAINERS: add myself as atmel-mci maintainer (sd/mmc interface) (diff) | |
| download | linux-dev-5fe23c7f51def59f66bc6aeee988ef1a467a2c8c.tar.xz linux-dev-5fe23c7f51def59f66bc6aeee988ef1a467a2c8c.zip | |
sdhci: Add support for hosts that are only capable of 1-bit transfers
Some hosts (hardware configurations, or particular SD/MMC slots) may
not support 4-bit bus. For example, on MPC8569E-MDS boards we can
switch between serial (1-bit only) and nibble (4-bit) modes, thought
we have to disable more peripherals to work in 4-bit mode.
Along with some small core changes, this patch modifies sdhci-of
driver, so that now it looks for "sdhci,1-bit-only" property in the
device-tree, and if specified we enable a proper quirk.
Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: Pierre Ossman <pierre@ossman.eu>
Diffstat (limited to 'drivers/mmc/host/sdhci.c')
| -rw-r--r-- | drivers/mmc/host/sdhci.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c index 3856669aa7e8..c7586739be1e 100644 --- a/drivers/mmc/host/sdhci.c +++ b/drivers/mmc/host/sdhci.c @@ -1761,7 +1761,10 @@ int sdhci_add_host(struct sdhci_host *host) mmc->ops = &sdhci_ops; mmc->f_min = host->max_clk / 256; mmc->f_max = host->max_clk; - mmc->caps = MMC_CAP_4_BIT_DATA | MMC_CAP_SDIO_IRQ; + mmc->caps = MMC_CAP_SDIO_IRQ; + + if (!(host->quirks & SDHCI_QUIRK_FORCE_1_BIT_DATA)) + mmc->caps |= MMC_CAP_4_BIT_DATA; if (caps & SDHCI_CAN_DO_HISPD) mmc->caps |= MMC_CAP_SD_HIGHSPEED; |