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yaml --- r: 149454 b: refs/heads/master c: 5cf20aa h: refs/heads/master v: v3
git-mirror · Jun 13, 2009 · f37588f · f37588f
1 parent 8c58326
commit f37588f
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Showing 2 changed files with 13 additions and 1 deletion.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 94d89efb2c347a82a08a61dbac8565b1087c3259
+refs/heads/master: 5cf20aa557e8f9dd5af302b8f33972082479753a
diff --git a/trunk/drivers/mmc/host/mmc_spi.c b/trunk/drivers/mmc/host/mmc_spi.c
@@ -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_device *spi)
 
 	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;