From: Wolfgang Muees <[email protected]>
o Speedup for slow cards by transfering more data at once.
This patch also reduces the amount of wear-out of the flash
blocks because fewer partial blocks are written.
Signed-off-by: Wolfgang Muees <[email protected]>
---
diff -uprN 2_6_29_rc7_patch1253467/drivers/mmc/host/mmc_spi.c 2_6_29_rc7_patch_wearout_speedup/drivers/mmc/host/mmc_spi.c
--- 2_6_29_rc7_patch1253467/drivers/mmc/host/mmc_spi.c 2009-04-07 17:19:21.000000000 +0200
+++ 2_6_29_rc7_patch_wearout_speedup/drivers/mmc/host/mmc_spi.c 2009-04-08 11:11:20.000000000 +0200
@@ -97,6 +97,14 @@
*/
#define r1b_timeout (HZ * 3)
+/* One of the critical speed parameters is the amount of data which may
+ * be transfered in one command. If this value is too low, the SD card
+ * controller has to do multiple partial block writes (argggh!). With
+ * today (2008) SD cards there is little speed gain if we transfer more
+ * than 64 KBytes at a time. So use this value until there is any indication
+ * that we should do more here.
+ */
+#define MMC_SPI_BLOCKSATONCE 128
/****************************************************************************/
@@ -1366,6 +1374,10 @@ static int mmc_spi_probe(struct spi_devi
mmc->ops = &mmc_spi_ops;
mmc->max_blk_size = MMC_SPI_BLOCKSIZE;
+ mmc->max_hw_segs = MMC_SPI_BLOCKSATONCE;
+ mmc->max_phys_segs = MMC_SPI_BLOCKSATONCE;
+ mmc->max_req_size = MMC_SPI_BLOCKSATONCE * MMC_SPI_BLOCKSIZE;
+ mmc->max_blk_count = MMC_SPI_BLOCKSATONCE;
mmc->caps = MMC_CAP_SPI;
---
regards
i. A. Wolfgang M?es
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On Wed, 8 Apr 2009 10:14:07 +0100
Wolfgang Mües <[email protected]> wrote:
> From: Wolfgang Muees <[email protected]>
>
> o Speedup for slow cards by transfering more data at once.
> This patch also reduces the amount of wear-out of the flash
> blocks because fewer partial blocks are written.
>
> Signed-off-by: Wolfgang Muees <[email protected]>
>
Looks ok. Queued.
Rgds
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-- Pierre Ossman
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