mmc: alcor: fix DMA reads

Setting max_blk_count to 1 here was causing the mmc block layer
to always use the MMC_READ_SINGLE_BLOCK command here, which the
driver does not DMA-accelerate.

Drop the max_blk_ settings here. The mmc host defaults suffice,
along with the max_segs and max_seg_size settings, which I have
now documented in more detail.

Now each MMC command reads 4 512-byte blocks, using DMA instead of
PIO. On my SD card, this increases read performance (measured with dd)
from 167kb/sec to 4.6mb/sec.

Link: http://lkml.kernel.org/r/CAD8Lp47L5T3jnAjBiPs1cQ+yFA3L6LJtgFvMETnBrY63-Zdi2g@mail.gmail.com
Signed-off-by: Daniel Drake <drake@endlessm.com>
Reviewed-by: Oleksij Rempel <linux@rempel-privat.de>
Fixes: c5413ad815a6 ("mmc: add new Alcor Micro Cardreader SD/MMC driver")
Cc: stable@vger.kernel.org
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

diff --git a/drivers/mmc/host/alcor.c b/drivers/mmc/host/alcor.c
index c712b7deb3a9d88e62416005d2444e908a4fb664..82a97866e0cf4c857cbb25c5487a3c6f80addfa0 100644 (file)
--- a/drivers/mmc/host/alcor.c
+++ b/drivers/mmc/host/alcor.c
@@ -1044,14 +1044,27 @@ static void alcor_init_mmc(struct alcor_sdmmc_host *host)
        mmc->caps2 = MMC_CAP2_NO_SDIO;
        mmc->ops = &alcor_sdc_ops;
 
-       /* Hardware cannot do scatter lists */
+       /* The hardware does DMA data transfer of 4096 bytes to/from a single
+        * buffer address. Scatterlists are not supported, but upon DMA
+        * completion (signalled via IRQ), the original vendor driver does
+        * then immediately set up another DMA transfer of the next 4096
+        * bytes.
+        *
+        * This means that we need to handle the I/O in 4096 byte chunks.
+        * Lacking a way to limit the sglist entries to 4096 bytes, we instead
+        * impose that only one segment is provided, with maximum size 4096,
+        * which also happens to be the minimum size. This means that the
+        * single-entry sglist handled by this driver can be handed directly
+        * to the hardware, nice and simple.
+        *
+        * Unfortunately though, that means we only do 4096 bytes I/O per
+        * MMC command. A future improvement would be to make the driver
+        * accept sg lists and entries of any size, and simply iterate
+        * through them 4096 bytes at a time.
+        */
        mmc->max_segs = AU6601_MAX_DMA_SEGMENTS;
        mmc->max_seg_size = AU6601_MAX_DMA_BLOCK_SIZE;
-
-       mmc->max_blk_size = mmc->max_seg_size;
-       mmc->max_blk_count = mmc->max_segs;
-
-       mmc->max_req_size = mmc->max_seg_size * mmc->max_segs;
+       mmc->max_req_size = mmc->max_seg_size;
 }
 
 static int alcor_pci_sdmmc_drv_probe(struct platform_device *pdev)