On 12/2/2014 3:56 AM, Sujit Reddy Thumma wrote:
eMMC cards with EXT_CSD version >= 7, optionally support command
queuing feature as defined by Jedec eMMC5.1. Add support for probing
command queue feature for such type of cards.
Signed-off-by: Sujit Reddy Thumma <sthu...@codeaurora.org>
Signed-off-by: Asutosh Das <asuto...@codeaurora.org>
---
drivers/mmc/core/mmc.c | 15 +++++++++++++++
include/linux/mmc/card.h | 7 +++++++
include/linux/mmc/mmc.h | 6 ++++++
3 files changed, 28 insertions(+)
diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index 1ab5f3a..0ef3af5 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -571,6 +571,21 @@ static int mmc_read_ext_csd(struct mmc_card *card, u8
*ext_csd)
card->ext_csd.data_sector_size = 512;
}
+ if (card->ext_csd.rev >= 7) {
+ card->ext_csd.cmdq_support = ext_csd[EXT_CSD_CMDQ_SUPPORT];
+ if (card->ext_csd.cmdq_support)
+ card->ext_csd.cmdq_depth = ext_csd[EXT_CSD_CMDQ_DEPTH];
+ }
Remove duplicated code.
+
+ if (card->ext_csd.rev >= 7) {
+ card->ext_csd.cmdq_support = ext_csd[EXT_CSD_CMDQ_SUPPORT];
+ if (card->ext_csd.cmdq_support)
+ card->ext_csd.cmdq_depth = ext_csd[EXT_CSD_CMDQ_DEPTH];
From the spec (7.4.19 CMDQ_DEPTH [307]) [4:0]: N, a parameter used to
calculate the Queue Depth of task queue in the device. Queue Depth = N+1.
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