From c9fddbc4f844f5a16b5957c61fe2cfcb5c12f990 Mon Sep 17 00:00:00 2001
From: Pierre Ossman <drzeus@drzeus.cx>
Date: Sun, 2 Dec 2007 19:52:11 +0100
Subject: sdhci: use PIO when DMA can't satisfy the request
Some controllers have been designed on the assumption that all transfers
will be 32-bit aligned, both in start address and in size. This is not a
guarantee the SDHCI specification provides and not one we can provide.
Revert back to PIO for individual requests in order to work around the
hardware bug.
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
---
drivers/mmc/host/sdhci.h | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
(limited to 'drivers/mmc/host/sdhci.h')
diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
index 05195ea900f4..e4d77b038bfa 100644
--- a/drivers/mmc/host/sdhci.h
+++ b/drivers/mmc/host/sdhci.h
@@ -171,7 +171,8 @@ struct sdhci_host {
spinlock_t lock; /* Mutex */
int flags; /* Host attributes */
-#define SDHCI_USE_DMA (1<<0)
+#define SDHCI_USE_DMA (1<<0) /* Host is DMA capable */
+#define SDHCI_REQ_USE_DMA (1<<1) /* Use DMA for this req. */
unsigned int max_clk; /* Max possible freq (MHz) */
unsigned int timeout_clk; /* Timeout freq (KHz) */
--
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