Commit afbf7250 authored Aug 09, 2016 by Rui Miguel Silva Committed by Greg Kroah-Hartman Aug 10, 2016

greybus: sdio: increase maximum segment size



Adjust maximum segment size of the sg list to meet the maximum request
size, this will allow to have less segments which increase the
performance of data movement during transfer operations.

Test Done: using mmc_test with best-case read/write performance and see
that only one segment is used and that the results are better (288KiB vs
300KiB in read operation).

Signed-off-by: Rui Miguel Silva <rui.silva@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

parent 64f28ada

drivers/staging/greybus/sdio.c

+2 −2

Original line number	Diff line number	Diff line
		@@ -802,11 +802,11 @@ static int gb_sdio_probe(struct gbphy_device *gbphy_dev,

		mmc->ops = &gb_sdio_ops;

		/* for now we just make a map 1:1 between max blocks and segments */
		mmc->max_segs = host->mmc->max_blk_count;
		mmc->max_seg_size = host->mmc->max_blk_size;

		/* for now we make a map 1:1 between max request and segment size */
		mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
		mmc->max_seg_size = mmc->max_req_size;

		mutex_init(&host->lock);
		spin_lock_init(&host->xfer);