From: Haavard Skinnemoen Date: Fri, 3 Oct 2008 12:46:17 +0000 (+0200) Subject: atmel-mci: Initialize BLKR before sending data transfer command X-Git-Tag: firefly_0821_release~17130^2~10^2~7 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=a252e3e35ef8144fb772da70bb93c99a1486097a;p=firefly-linux-kernel-4.4.55.git 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 Signed-off-by: Haavard Skinnemoen --- diff --git a/drivers/mmc/host/atmel-mci.c b/drivers/mmc/host/atmel-mci.c index 917035e16da4..00008967ef7a 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;