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mmc: tegra: support 4-bit operation too on 8-bit slots

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If a board has all 8 data lines routed, the SD/MMC controller can still
operate in 4-bit (or presumably even 1-bit) mode. Adjust Tegra's MMC
driver to report the 4-bit capability even for 8-bit slots.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Tom Warren <twarren@nvidia.com>
This commit is contained in:
Stephen Warren 2012-11-02 06:56:12 +00:00 committed by Tom Warren
parent 1ed0b51b7d
commit 8c0ec0dbc4
1 changed files with 4 additions and 3 deletions
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7
drivers/mmc/tegra_mmc.c
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@ -547,10 +547,11 @@ int tegra_mmc_init(int dev_index, int bus_width, int pwr_gpio, int cd_gpio)
mmc->getcd = tegra_mmc_getcd;
mmc->voltages = MMC_VDD_32_33 | MMC_VDD_33_34 | MMC_VDD_165_195;
mmc->host_caps = 0;
if (bus_width == 8)
mmc->host_caps = MMC_MODE_8BIT;
else
mmc->host_caps = MMC_MODE_4BIT;
mmc->host_caps |= MMC_MODE_8BIT;
if (bus_width >= 4)
mmc->host_caps |= MMC_MODE_4BIT;
mmc->host_caps |= MMC_MODE_HS_52MHz | MMC_MODE_HS | MMC_MODE_HC;
/*