From: Saugata Das <[email protected]> This patch adds the support for large sector size of 4KB by disabling emulation. This patch passes eMMC DATA_SECTOR_SIZE as the logical block size during mmc_blk_alloc_req.
In order to use this patch for 4KB sector size, ensure that USE_NATIVE_SECTOR is enabled, partition table is 4KB sector size aligned and file system block size is 4KB. Signed-off-by: Saugata Das <[email protected]> --- drivers/mmc/card/block.c | 16 ++++++++++++++-- drivers/mmc/core/mmc.c | 2 ++ 2 files changed, 16 insertions(+), 2 deletions(-) diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c index 91cda75..b4d0eb1 100644 --- a/drivers/mmc/card/block.c +++ b/drivers/mmc/card/block.c @@ -1284,7 +1284,7 @@ static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *rqc) int ret = 1, disable_multi = 0, retry = 0, type; enum mmc_blk_status status; struct mmc_queue_req *mq_rq; - struct request *req; + struct request *req = rqc; struct mmc_async_req *areq; if (!rqc && !mq->mqrq_prev->req) @@ -1292,6 +1292,14 @@ static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *rqc) do { if (rqc) { + + /* + * When 4KB native sector is enabled, single block + * read or write is not allowed + */ + if ((brq->data.blocks == 1) && + (card->ext_csd.data_sector_size == 4096)) + goto cmd_abort; mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq); areq = &mq->mqrq_cur->mmc_active; } else @@ -1539,7 +1547,11 @@ static struct mmc_blk_data *mmc_blk_alloc_req(struct mmc_card *card, snprintf(md->disk->disk_name, sizeof(md->disk->disk_name), "mmcblk%d%s", md->name_idx, subname ? subname : ""); - blk_queue_logical_block_size(md->queue.queue, 512); + if (mmc_card_mmc(card)) + blk_queue_logical_block_size(md->queue.queue, + card->ext_csd.data_sector_size); + else + blk_queue_logical_block_size(md->queue.queue, 512); set_capacity(md->disk, size); if (mmc_host_cmd23(card->host)) { diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c index 7268c26..11444c6 100644 --- a/drivers/mmc/core/mmc.c +++ b/drivers/mmc/core/mmc.c @@ -516,6 +516,8 @@ static int mmc_read_ext_csd(struct mmc_card *card, u8 *ext_csd) } else { card->ext_csd.data_tag_unit_size = 0; } + } else { + card->ext_csd.data_sector_size = 512; } out: -- 1.7.4.3 -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
