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OMAP: HSMMC: do not enable buffer ready interrupt if using DMA

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This considerably reduces the number of interrupts during a transfer
and ought to result in some power saving.

Signed-off-by: Anand Gadiyar <gadiyar@ti.com>
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Acked-by: Kishore Kadiyala <kishore.kadiyala@ti.com>
Cc: Pierre Ossman <drzeus@drzeus.cx>
Cc: Matt Fleming <matt@console-pimps.org>
Cc: Ian Molton <ian@mnementh.co.uk>
Cc: "Roberto A. Foglietta" <roberto.foglietta@gmail.com>
Cc: Philip Langdale <philipl@overt.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Anand Gadiyar 2009-09-22 16:44:21 -07:00 committed by Linus Torvalds
parent 500f35648e
commit ccdfe3a66a
1 changed files with 8 additions and 1 deletions
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9
drivers/mmc/host/omap_hsmmc.c
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@ -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_host *host, struct mmc_command *cmd,
*/
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) {