From mboxrd@z Thu Jan 1 00:00:00 1970 From: Peng Fan Date: Thu, 1 Sep 2016 11:13:39 +0800 Subject: [U-Boot] [PATCH V4 2/2] mmc: sd: optimize erase In-Reply-To: <1472699619-4368-1-git-send-email-peng.fan@nxp.com> References: <1472699619-4368-1-git-send-email-peng.fan@nxp.com> Message-ID: <1472699619-4368-2-git-send-email-peng.fan@nxp.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de 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 Cc: Jaehoon Chung Cc: Simon Glass Cc: Bin Meng Cc: Stefan Wahren Cc: Clemens Gruber Cc: Kever Yang Cc: Eric Nelson Cc: Stephen Warren --- 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; -- 2.6.2