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Subject[RFC 3/4] sdhci: cache when the MMC bus width is 4 bits wide
Date
This can later be used when we send commands.

Cc: Chris Ball <cjb@laptop.org>
Cc: Kalle Valo <kvalo@adurom.com>
Cc: Naveen Singh <nsingh@atheros.com>
Cc: Vipin Mehta <Vipin.Mehta@atheros.com>
Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com>
---
drivers/mmc/host/sdhci.c | 7 +++++--
include/linux/mmc/sdhci.h | 1 +
2 files changed, 6 insertions(+), 2 deletions(-)

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 */

--
1.7.4.15.g7811d


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