[040/177] mmc: omap: fix for bus width which improves SD card's peformance.

Commit Message

Andrew Morton Aug. 11, 2010, 1:01 a.m. UTC

None

Patch

diff -puN drivers/mmc/host/omap_hsmmc.c~mmc-omap-fix-for-bus-width-which-improves-sd-cards-peformance drivers/mmc/host/omap_hsmmc.c
--- a/drivers/mmc/host/omap_hsmmc.c~mmc-omap-fix-for-bus-width-which-improves-sd-cards-peformance
+++ a/drivers/mmc/host/omap_hsmmc.c
@@ -2096,10 +2096,23 @@  static int __init omap_hsmmc_probe(struc
 	mmc->caps |= MMC_CAP_MMC_HIGHSPEED | MMC_CAP_SD_HIGHSPEED |
 		     MMC_CAP_WAIT_WHILE_BUSY;
 
-	if (mmc_slot(host).wires >= 8)
+	switch (mmc_slot(host).wires) {
+	case 8:
 		mmc->caps |= MMC_CAP_8_BIT_DATA;
-	else if (mmc_slot(host).wires >= 4)
+		/* Fall through */
+	case 4:
 		mmc->caps |= MMC_CAP_4_BIT_DATA;
+		break;
+	case 1:
+		/* Nothing to crib here */
+	case 0:
+		/* Assuming nothing was given by board, Core use's 1-Bit */
+		break;
+	default:
+		/* Completely unexpected.. Core goes with 1-Bit Width */
+		dev_crit(mmc_dev(host->mmc), "Invalid width %d\n used!"
+			"using 1 instead\n", mmc_slot(host).wires);
+	}
 
 	if (mmc_slot(host).nonremovable)
 		mmc->caps |= MMC_CAP_NONREMOVABLE;