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[01/18] mmc: meson-gx: set segment host parameters

Message ID e336daec-55fc-e524-9949-b8de7d68b9ef@gmail.com (mailing list archive)
State New, archived
Headers show

Commit Message

Heiner Kallweit Feb. 14, 2017, 8:05 p.m. UTC 
Setting the segment parameters boosted the read performance from
13 MB/s to 32 MB/s in my case.
Default for segment size is only 4k (PAGE_SIZE).

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
---
 drivers/mmc/host/meson-gx-mmc.c | 3 +++
 1 file changed, 3 insertions(+)
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Patch

diff --git a/drivers/mmc/host/meson-gx-mmc.c b/drivers/mmc/host/meson-gx-mmc.c
index 5a959783..1ad66f84 100644
--- a/drivers/mmc/host/meson-gx-mmc.c
+++ b/drivers/mmc/host/meson-gx-mmc.c
@@ -118,6 +118,7 @@ 
 #define SD_EMMC_CFG_RESP_TIMEOUT 256 /* in clock cycles */
 #define SD_EMMC_CFG_CMD_GAP 16 /* in clock cycles */
 #define MUX_CLK_NUM_PARENTS 2
+#define MESON_MMC_MAX_SEGS 512
 
 struct meson_host {
 	struct	device		*dev;
@@ -789,8 +790,10 @@  static int meson_mmc_probe(struct platform_device *pdev)
 	if (ret)
 		goto free_host;
 
+	mmc->max_segs = MESON_MMC_MAX_SEGS;
 	mmc->max_blk_count = CMD_CFG_LENGTH_MASK;
 	mmc->max_req_size = mmc->max_blk_count * mmc->max_blk_size;
+	mmc->max_seg_size = mmc->max_req_size;
 
 	/* data bounce buffer */
 	host->bounce_buf_size = mmc->max_req_size;