From a586c0aa211fb79ecaa06aee3299bfdd81329876 Mon Sep 17 00:00:00 2001 From: Ruud Commandeur Date: Wed, 22 May 2013 13:19:43 +0200 Subject: mmc write bug fix MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit This patch fixes a bug related to mmc writes. When doing fatwrites on an SD-Card, MMC bus problems can occur. Depending on the size of the file, "MMC0: Bus busy timeout!" is reported, resulting in an SD-Card that is no longer responding. It appears to be, that set_cluster can be called with a size being zero. That can be with a file that has a size being an exact multiple (including 0) of the clustersize, but also for files that are smaller than the size of one cluster. The same problem occurs if the "mmc write" command is given with a block count being 0. By adding a check for the block count being zero in mmc_write_blocks (drivers/mmc.c), this problem is solved. Signed-off-by: Ruud Commandeur Cc: Tom Rini Cc: Benoît Thébaudeau Cc: Mats Karrman Cc: Andy Fleming Signed-off-by: Andy Fleming --- drivers/mmc/mmc.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) (limited to 'drivers') diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c index 0a2f535..fe83934 100644 --- a/drivers/mmc/mmc.c +++ b/drivers/mmc/mmc.c @@ -301,10 +301,12 @@ mmc_write_blocks(struct mmc *mmc, ulong start, lbaint_t blkcnt, const void*src) return 0; } - if (blkcnt > 1) - cmd.cmdidx = MMC_CMD_WRITE_MULTIPLE_BLOCK; - else + if (blkcnt == 0) + return 0; + else if (blkcnt == 1) cmd.cmdidx = MMC_CMD_WRITE_SINGLE_BLOCK; + else + cmd.cmdidx = MMC_CMD_WRITE_MULTIPLE_BLOCK; if (mmc->high_capacity) cmd.cmdarg = start; -- cgit v1.1