diff options
| author | Saugata Das <saugata.das@linaro.org> | 2012-05-17 16:32:21 +0530 |
|---|---|---|
| committer | Chris Ball <cjb@laptop.org> | 2012-05-17 09:35:21 -0400 |
| commit | a5075eb94837edde6833fd5e0277fc2370cf8b39 (patch) | |
| tree | e37957d108c9a01fc78dc9bdc4d914b382905a34 /drivers/mmc | |
| parent | 6801c41a77123712accfde898820972a1f6fc117 (diff) | |
| download | linux-stable-a5075eb94837edde6833fd5e0277fc2370cf8b39.tar.gz linux-stable-a5075eb94837edde6833fd5e0277fc2370cf8b39.tar.bz2 linux-stable-a5075eb94837edde6833fd5e0277fc2370cf8b39.zip | |
mmc: block: Allow disabling 512B sector size emulation
This patch adds 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 and sector size are 4KB multiples.
Signed-off-by: Saugata Das <saugata.das@linaro.org>
Reviewed-by: Subhash Jadavani <subhashj@codeaurora.org>
Reviewed-by: Namjae Jeon <linkinjeon@gmail.com>
Reviewed-by: Subhash Jadavani <subhashj@codeaurora.org>
Signed-off-by: Chris Ball <cjb@laptop.org>
Diffstat (limited to 'drivers/mmc')
| -rw-r--r-- | drivers/mmc/card/block.c | 19 | ||||
| -rw-r--r-- | drivers/mmc/core/mmc.c | 2 |
2 files changed, 19 insertions, 2 deletions
diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c index 91cda7551a60..dd2d374dcc7a 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 +1292,16 @@ static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *rqc) do { if (rqc) { + /* + * When 4KB native sector is enabled, only 8 blocks + * multiple read or write is allowed + */ + if ((brq->data.blocks & 0x07) && + (card->ext_csd.data_sector_size == 4096)) { + pr_err("%s: Transfer size is not 4KB sector size aligned\n", + req->rq_disk->disk_name); + goto cmd_abort; + } mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq); areq = &mq->mqrq_cur->mmc_active; } else @@ -1539,7 +1549,12 @@ 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 2f0e11c9fd67..2d4a4b746750 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: |