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@xxxxxxxxx>
---
drivers/mmc/host/meson-gx-mmc.c | 3 +++
1 file changed, 3 insertions(+)
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;
--
2.11.1
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