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OMAP: HSMMC: do not enable buffer ready interrupt if using DMA
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>
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1 changed files with 8 additions and 1 deletions
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@ -70,6 +70,8 @@
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#define DTO_MASK 0x000F0000
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#define DTO_SHIFT 16
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#define INT_EN_MASK 0x307F0033
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#define BWR_ENABLE (1 << 4)
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#define BRR_ENABLE (1 << 5)
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#define INIT_STREAM (1 << 1)
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#define DP_SELECT (1 << 21)
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#define DDIR (1 << 4)
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@ -241,7 +243,12 @@ mmc_omap_start_command(struct mmc_omap_host *host, struct mmc_command *cmd,
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*/
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OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR);
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OMAP_HSMMC_WRITE(host->base, ISE, INT_EN_MASK);
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OMAP_HSMMC_WRITE(host->base, IE, INT_EN_MASK);
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if (host->use_dma)
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OMAP_HSMMC_WRITE(host->base, IE,
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INT_EN_MASK & ~(BRR_ENABLE | BWR_ENABLE));
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else
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OMAP_HSMMC_WRITE(host->base, IE, INT_EN_MASK);
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host->response_busy = 0;
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if (cmd->flags & MMC_RSP_PRESENT) {
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