From e492dbb41e025ac1a7d7934b1df52b2f0485f8dd Mon Sep 17 00:00:00 2001
From: Peng Fan <van.freenix@gmail.com>
Date: Thu, 1 Sep 2016 11:13:39 +0800
Subject: [PATCH] mmc: sd: optimize erase
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>
---
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 0f8b5c79d7..2289640375 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;
--
2.39.5