[PATCH v3 1/3] mmc: dw_mmc: fix the max_blk_count in IDMAC
From: alim.akhtar@samsung.com (Alim Akhtar)
Date: 2014-12-22 12:12:02
Also in:
linux-mmc
Subsystem:
multimedia card (mmc), secure digital (sd) and sdio subsystem, synopsys designware mmc/sd/sdio driver, the rest · Maintainers:
Ulf Hansson, Jaehoon Chung, Shawn Lin, Linus Torvalds
From: Seungwon Jeon <redacted> Even though 1MB is reserved for descriptor table in IDMAC, the dw_mmc host driver is allowed to receive only maximum 128KB block length in one request. This is caused by setting improper max_blk_count. It needs to be e adjusted so that descriptor table is used fully. It is found that the performance is improved with the increased the max_blk_count. Signed-off-by: Seungwon Jeon <redacted> Acked-by: Jaehoon Chung <jh80.chung@samsung.com> Signed-off-by: Alim Akhtar <alim.akhtar@samsung.com> --- drivers/mmc/host/dw_mmc.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
index 64ea042..a1b80e5 100644
--- a/drivers/mmc/host/dw_mmc.c
+++ b/drivers/mmc/host/dw_mmc.c@@ -2332,9 +2332,9 @@ static int dw_mci_init_slot(struct dw_mci *host, unsigned int id) #ifdef CONFIG_MMC_DW_IDMAC mmc->max_segs = host->ring_size; mmc->max_blk_size = 65536; - mmc->max_blk_count = host->ring_size; mmc->max_seg_size = 0x1000; - mmc->max_req_size = mmc->max_seg_size * mmc->max_blk_count; + mmc->max_req_size = mmc->max_seg_size * host->ring_size; + mmc->max_blk_count = mmc->max_req_size / 512; #else mmc->max_segs = 64; mmc->max_blk_size = 65536; /* BLKSIZ is 16 bits */
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1.7.9.5