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[RFC,3/4] sdhci: cache when the MMC bus width is 4 bits wide

Message ID 1300486320-23607-4-git-send-email-lrodriguez@atheros.com (mailing list archive)
State New, archived
Headers show

Commit Message

Luis Rodriguez March 18, 2011, 10:11 p.m. UTC 
None
diff mbox

Patch

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 7074870..a4cf0c0 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -1206,10 +1206,13 @@  static void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 		} else {
 			if (host->version >= SDHCI_SPEC_300)
 				ctrl &= ~SDHCI_CTRL_8BITBUS;
-			if (ios->bus_width == MMC_BUS_WIDTH_4)
+			if (ios->bus_width == MMC_BUS_WIDTH_4) {
 				ctrl |= SDHCI_CTRL_4BITBUS;
-			else
+				host->flags |= SDHCI_IN_4BIT_MODE;
+			} else {
 				ctrl &= ~SDHCI_CTRL_4BITBUS;
+				host->flags &= ~SDHCI_IN_4BIT_MODE;
+			}
 		}
 		sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
 	}
diff --git a/include/linux/mmc/sdhci.h b/include/linux/mmc/sdhci.h
index 83bd9f7..266f796 100644
--- a/include/linux/mmc/sdhci.h
+++ b/include/linux/mmc/sdhci.h
@@ -109,6 +109,7 @@  struct sdhci_host {
 #define SDHCI_USE_ADMA		(1<<1)	/* Host is ADMA capable */
 #define SDHCI_REQ_USE_DMA	(1<<2)	/* Use DMA for this req. */
 #define SDHCI_DEVICE_DEAD	(1<<3)	/* Device unresponsive */
+#define SDHCI_IN_4BIT_MODE	(1<<4)  /* bus is in 4-bit mode */
 
 	unsigned int version;	/* SDHCI spec. version */