diff options
Diffstat (limited to 'recipes/linux/linux-2.6.18/dmac-add-explicit-blockcount-to-dma_request_sg.patch')
| -rw-r--r-- | recipes/linux/linux-2.6.18/dmac-add-explicit-blockcount-to-dma_request_sg.patch | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/recipes/linux/linux-2.6.18/dmac-add-explicit-blockcount-to-dma_request_sg.patch b/recipes/linux/linux-2.6.18/dmac-add-explicit-blockcount-to-dma_request_sg.patch new file mode 100644 index 0000000000..54400aeff1 --- /dev/null +++ b/recipes/linux/linux-2.6.18/dmac-add-explicit-blockcount-to-dma_request_sg.patch @@ -0,0 +1,66 @@ +From nobody Mon Sep 17 00:00:00 2001 +From: Haavard Skinnemoen <hskinnemoen@atmel.com> +Date: Sun, 14 Jan 2007 19:07:06 +0100 +Subject: [DW DMAC] Add nr_blocks field to struct dma_request_sg + +Allow drivers to specify how many blocks to transfer in a sg request. +The number of blocks will no longer be automatically calculated based +on the scatterlist because this doesn't always correspond with the +desired amount of data to be transferred. + +Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com> +--- + arch/avr32/drivers/dw-dmac.c | 13 ++++++------- + include/asm-avr32/dma-controller.h | 1 + + 2 files changed, 7 insertions(+), 7 deletions(-) + +Index: linux-2.6.18-avr32/include/asm-avr32/dma-controller.h +=================================================================== +--- linux-2.6.18-avr32.orig/include/asm-avr32/dma-controller.h 2007-01-15 15:34:32.000000000 +0100 ++++ linux-2.6.18-avr32/include/asm-avr32/dma-controller.h 2007-01-15 15:34:50.000000000 +0100 +@@ -36,6 +36,7 @@ struct dma_request_sg { + int nr_sg; + struct scatterlist *sg; + unsigned long block_size; ++ unsigned int nr_blocks; + + dma_addr_t data_reg; + unsigned short periph_id; +Index: linux-2.6.18-avr32/arch/avr32/drivers/dw-dmac.c +=================================================================== +--- linux-2.6.18-avr32.orig/arch/avr32/drivers/dw-dmac.c 2007-01-15 15:35:00.000000000 +0100 ++++ linux-2.6.18-avr32/arch/avr32/drivers/dw-dmac.c 2007-01-15 15:35:03.000000000 +0100 +@@ -176,7 +176,8 @@ static int dmac_prepare_request_sg(struc + struct dw_dma_channel *chan; + unsigned long ctlhi, ctllo, cfghi, cfglo; + unsigned long block_size; +- int ret, i, nr_blocks, direction; ++ unsigned int nr_blocks; ++ int ret, i, direction; + unsigned long flags; + + spin_lock_irqsave(&dmac->lock, flags); +@@ -215,12 +216,9 @@ static int dmac_prepare_request_sg(struc + * Each block will get its own Linked List Item (LLI) below. + */ + block_size = req->block_size; +- pr_debug("block_size = %lu, nr_sg = %u\n", block_size, req->nr_sg); +- for (i = 0, nr_blocks = 0; i < req->nr_sg; i++) { +- pr_debug("sg[i].length = %u\n", req->sg[i].length); +- BUG_ON(req->sg[i].length % block_size); +- nr_blocks += req->sg[i].length / block_size; +- } ++ nr_blocks = req->nr_blocks; ++ pr_debug("block_size %lu, nr_blocks %u nr_sg = %u\n", ++ block_size, nr_blocks, req->nr_sg); + + BUG_ON(nr_blocks == 0); + chan->nr_blocks = nr_blocks; +@@ -269,6 +267,7 @@ static int dmac_prepare_request_sg(struc + } + dmac_chan_writel_lo(dmac, req->req.channel, CTL, ctllo); + dmac_chan_writel_hi(dmac, req->req.channel, CTL, ctlhi); ++ pr_debug("ctl hi:lo 0x%lx:%lx\n", ctlhi, ctllo); + } else { + struct dw_dma_lli *lli, *lli_prev = NULL; + int j = 0, offset = 0; |