On 5/9/2012 8:18 PM, Saugata Das wrote:
From: Saugata Das<saugata.das@xxxxxxxxxx>
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<saugata.das@xxxxxxxxxx>
---
drivers/mmc/card/block.c | 6 +++++-
drivers/mmc/core/mmc.c | 2 ++
2 files changed, 7 insertions(+), 1 deletions(-)
diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
index a7c75d8..0e54118e 100644
--- a/drivers/mmc/card/block.c
+++ b/drivers/mmc/card/block.c
@@ -1517,7 +1517,11 @@ 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);
Shouldn't we also set the physical block size to NATIVE_SECTOR_SIZE value?
Other question,
Did you find any eMMC device which 4K native sector size? If yes, please
share the test results.
Other than that, this patch looks good to me.
Regards,
Subhash
+ 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 02914d6..8dcbe995 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -533,6 +533,8 @@ 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:
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