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authorHaavard Skinnemoen <haavard.skinnemoen@atmel.com>2008-10-03 14:46:17 +0200
committerHaavard Skinnemoen <haavard.skinnemoen@atmel.com>2008-10-05 20:39:20 +0200
commita252e3e35ef8144fb772da70bb93c99a1486097a (patch)
tree0609ff242637015e0e171860bfd6d60564c351c2 /drivers/mmc/host
parentfec6ed1d1f9b78a6acb4a3eb2c46c812ac2e96f0 (diff)
atmel-mci: Initialize BLKR before sending data transfer command
The atmel-mci driver sometimes fails data transfers like this: mmcblk0: error -5 transferring data end_request: I/O error, dev mmcblk0, sector 2749769 end_request: I/O error, dev mmcblk0, sector 2749777 It turns out that this might be caused by the BLKR register (which contains the block size and the number of blocks being transfered) being initialized too late. This patch moves the initialization of BLKR so that it contains the correct value before the block transfer command is sent. This error is difficult to reproduce, but if you insert a long delay (mdelay(10) or thereabouts) between the calls to atmci_start_command() and atmci_submit_data(), all transfers seem to fail without this patch, while I haven't seen any failures with this patch. Reported-by: Hein_Tibosch <hein_tibosch@yahoo.es> Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
Diffstat (limited to 'drivers/mmc/host')
-rw-r--r--drivers/mmc/host/atmel-mci.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/mmc/host/atmel-mci.c b/drivers/mmc/host/atmel-mci.c
index 917035e16da..00008967ef7 100644
--- a/drivers/mmc/host/atmel-mci.c
+++ b/drivers/mmc/host/atmel-mci.c
@@ -426,8 +426,6 @@ static u32 atmci_submit_data(struct mmc_host *mmc, struct mmc_data *data)
host->sg = NULL;
host->data = data;
- mci_writel(host, BLKR, MCI_BCNT(data->blocks)
- | MCI_BLKLEN(data->blksz));
dev_vdbg(&mmc->class_dev, "BLKR=0x%08x\n",
MCI_BCNT(data->blocks) | MCI_BLKLEN(data->blksz));
@@ -483,6 +481,10 @@ static void atmci_request(struct mmc_host *mmc, struct mmc_request *mrq)
if (data->blocks > 1 && data->blksz & 3)
goto fail;
atmci_set_timeout(host, data);
+
+ /* Must set block count/size before sending command */
+ mci_writel(host, BLKR, MCI_BCNT(data->blocks)
+ | MCI_BLKLEN(data->blksz));
}
iflags = MCI_CMDRDY;