To SD, there is no erase group, then the value erase_grp_size will be default 1. When erasing SD blocks, the blocks will be erased one by one, which is time consuming.
We use AU_SIZE as a group to speed up the erasing.
Erasing 4MB with a SD2.0 Card with AU_SIZE 4MB. `time mmc erase 0x100000 0x2000` time: 44.856 seconds (before optimization) time: 0.335 seconds (after optimization)
Signed-off-by: Peng Fan peng.fan@nxp.com Cc: Jaehoon Chung jh80.chung@samsung.com Cc: Simon Glass sjg@chromium.org Cc: Bin Meng bmeng.cn@gmail.com Cc: Stefan Wahren stefan.wahren@i2se.com Cc: Clemens Gruber clemens.gruber@pqgruber.com Cc: Kever Yang kever.yang@rock-chips.com Cc: Eric Nelson eric@nelint.com Cc: Stephen Warren swarren@nvidia.com --- V4: No change.
V3: No change.
V2: Add test results. drivers/mmc/mmc_write.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/drivers/mmc/mmc_write.c b/drivers/mmc/mmc_write.c index 0f8b5c7..2289640 100644 --- a/drivers/mmc/mmc_write.c +++ b/drivers/mmc/mmc_write.c @@ -100,8 +100,13 @@ unsigned long mmc_berase(struct blk_desc *block_dev, lbaint_t start, & ~(mmc->erase_grp_size - 1)) - 1);
while (blk < blkcnt) { - blk_r = ((blkcnt - blk) > mmc->erase_grp_size) ? - mmc->erase_grp_size : (blkcnt - blk); + if (IS_SD(mmc) && mmc->ssr.au) { + blk_r = ((blkcnt - blk) > mmc->ssr.au) ? + mmc->ssr.au : (blkcnt - blk); + } else { + blk_r = ((blkcnt - blk) > mmc->erase_grp_size) ? + mmc->erase_grp_size : (blkcnt - blk); + } err = mmc_erase_t(mmc, start + blk, blk_r); if (err) break;