[U-Boot] [PATCH 1/2] mmc: tegra: support 4-bit operation too on 8-bit slots

[Stephen Warren]

From: Stephen Warren <swarren at nvidia.com>

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 at nvidia.com>
---
Note: This series depends on Andy Fleming's "mmc: Properly determine
maximum supported bus width"
---
 drivers/mmc/tegra_mmc.c |    7 ++++---
 1 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/mmc/tegra_mmc.c b/drivers/mmc/tegra_mmc.c
index 8fea6a6..1fd5592 100644
--- a/drivers/mmc/tegra_mmc.c
+++ b/drivers/mmc/tegra_mmc.c
@@ -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;
 
 	/*
-- 
1.7.0.4