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

Message ID 1351875373-18673-1-git-send-email-swarren@wwwdotorg.org
State Accepted
Delegated to: Tom Warren
Headers show

Commit Message

Stephen Warren Nov. 2, 2012, 4:56 p.m. UTC 
From: Stephen Warren <swarren@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@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(-)
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Patch

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;
 
 	/*