diff options
Diffstat (limited to 'target/linux/ep93xx/patches-2.6.38/002-mmc_spi_fix_sdhc.patch')
| -rw-r--r-- | target/linux/ep93xx/patches-2.6.38/002-mmc_spi_fix_sdhc.patch | 74 |
1 files changed, 0 insertions, 74 deletions
diff --git a/target/linux/ep93xx/patches-2.6.38/002-mmc_spi_fix_sdhc.patch b/target/linux/ep93xx/patches-2.6.38/002-mmc_spi_fix_sdhc.patch deleted file mode 100644 index 5211e00c49..0000000000 --- a/target/linux/ep93xx/patches-2.6.38/002-mmc_spi_fix_sdhc.patch +++ /dev/null @@ -1,74 +0,0 @@ -This patch makes SDHC cards work with the mmc_spi driver. - -The problem is that they fail when reading the last block of the card using -a multi-block read. This is because on SDHC the multiple block read has to be -stopped with an explicit STOP command, which needs to be sent to the card -while the incoming transfer is in progress. -The 2.6.3[45] mmc-spi driver sends it after the last block transfer, so the -SDHC card continues reading past the end of the card. -This patch works around this by using single-block reads if we're reading the -last blocks of the card. - -martinwguy, 14 May 2010 - -Date: Thu, 29 Apr 2010 21:30:36 +0300 -From: Mika Westerberg <mika.westerberg@iki.fi> -To: Martin Guy <martinwguy@gmail.com> - -On Wed, Apr 21, 2010 at 02:10:08AM +0100, Martin Guy wrote: -> -> the SDHC cards I have don't work at all, spewing tons of: -> mmcblk0: error -38 sending status comand -> mmcblk0: error -38 sending read/write command, response 0x4, card status 0xff04 -> end_request: I/O error, dev mmcblk0, sector 7744509 - -I bought today a new 4GB SDHC card and with that I get similar -errors that you are getting. I hacked around quick fix which seems -to work in my case. I'm wondering whether you could check if it -helps with your SDHC card as well? - -This problem is easy to reproduce, just read last sector of the -card (I wrote simple C program but running fdisk -l does the same). - -Patch is below. - -Thanks, -MW - -From: Mika Westerberg <mika.westerberg@iki.fi> -Date: Thu, 29 Apr 2010 21:14:32 +0300 -Subject: [PATCH] mmc_block: use single block reads for last block on SPI - -Some SD-cards fail when doing multiblock read for last block with SPI host. Real -reason is not known but as workaround we can perform this last read using -multiple single block reads. - -Signed-off-by: Mika Westerberg <mika.westerberg@iki.fi> ---- - drivers/mmc/card/block.c | 19 +++++++++++++++++++ - 1 files changed, 19 insertions(+), 0 deletions(-) - ---- a/drivers/mmc/card/block.c -+++ b/drivers/mmc/card/block.c -@@ -366,6 +366,22 @@ static int mmc_blk_issue_rw_rq(struct mm - if (brq.data.blocks > card->host->max_blk_count) - brq.data.blocks = card->host->max_blk_count; - -+ if (mmc_host_is_spi(card->host)) { -+ /* -+ * Some SD-cards fail when we are reading last block -+ * with multiblock read. In these cases we automatically -+ * use single block reads. This only happens on SPI -+ * hosts. -+ */ -+ if (rq_data_dir(req) == READ && brq.data.blocks > 1) { -+ sector_t s = blk_rq_pos(req) + brq.data.blocks; -+ -+ if (s >= get_capacity(md->disk)) { -+ disable_multi = 1; -+ } -+ } -+ } -+ - /* - * After a read error, we redo the request one sector at a time - * in order to accurately determine which sectors can be read |