The patch titled
OMAP: HSMMC: do not enable buffer ready interrupt if using DMA
has been added to the -mm tree. Its filename is
omap-hsmmc-do-not-enable-buffer-ready-interrupt-if-using-dma.patch
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------------------------------------------------------
Subject: OMAP: HSMMC: do not enable buffer ready interrupt if using DMA
From: Anand Gadiyar <gadiyar@xxxxxx>
This considerably reduces the number of interrupts during a transfer
and ought to result in some power saving.
Signed-off-by: Anand Gadiyar <gadiyar@xxxxxx>
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@xxxxxx>
Acked-by: Kishore Kadiyala <kishore.kadiyala@xxxxxx>
Cc: Pierre Ossman <drzeus@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/mmc/host/omap_hsmmc.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff -puN drivers/mmc/host/omap_hsmmc.c~omap-hsmmc-do-not-enable-buffer-ready-interrupt-if-using-dma drivers/mmc/host/omap_hsmmc.c
--- a/drivers/mmc/host/omap_hsmmc.c~omap-hsmmc-do-not-enable-buffer-ready-interrupt-if-using-dma
+++ a/drivers/mmc/host/omap_hsmmc.c
@@ -70,6 +70,8 @@
#define DTO_MASK 0x000F0000
#define DTO_SHIFT 16
#define INT_EN_MASK 0x307F0033
+#define BWR_ENABLE (1 << 4)
+#define BRR_ENABLE (1 << 5)
#define INIT_STREAM (1 << 1)
#define DP_SELECT (1 << 21)
#define DDIR (1 << 4)
@@ -241,7 +243,12 @@ mmc_omap_start_command(struct mmc_omap_h
*/
OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR);
OMAP_HSMMC_WRITE(host->base, ISE, INT_EN_MASK);
- OMAP_HSMMC_WRITE(host->base, IE, INT_EN_MASK);
+
+ if (host->use_dma)
+ OMAP_HSMMC_WRITE(host->base, IE,
+ INT_EN_MASK & ~(BRR_ENABLE | BWR_ENABLE));
+ else
+ OMAP_HSMMC_WRITE(host->base, IE, INT_EN_MASK);
host->response_busy = 0;
if (cmd->flags & MMC_RSP_PRESENT) {
_
Patches currently in -mm which might be from gadiyar@xxxxxx are
linux-next.patch
omap-hsmmc-do-not-enable-buffer-ready-interrupt-if-using-dma.patch
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