Piteball/android_kernel_google_msm
1
0
Fork 0
mirror of https://github.com/followmsi/android_kernel_google_msm.git synced 2024-11-06 23:17:41 +00:00
Code Issues Projects Releases Wiki Activity

intel_mid_dma: add support for single item scatter-gather list

Browse source 
Current driver's device_prep_slave_sg can't be used by DMAC2 even
the sg list contains one item, this patch will enable DMAC2 to
use this API.

Signed-off-by: Feng Tang <feng.tang@intel.com>
Acked-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Feng Tang 2010-12-02 17:14:30 +08:00 committed by Dan Williams
parent 66bde0b70a
commit 0be035f348
1 changed files with 24 additions and 4 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

28
drivers/dma/intel_mid_dma.c
View file

@ -664,11 +664,20 @@ static struct dma_async_tx_descriptor *intel_mid_dma_prep_memcpy(
/*calculate CTL_LO*/
ctl_lo.ctl_lo = 0;
ctl_lo.ctlx.int_en = 1;
ctl_lo.ctlx.dst_tr_width = mids->dma_slave.dst_addr_width;
ctl_lo.ctlx.src_tr_width = mids->dma_slave.src_addr_width;
ctl_lo.ctlx.dst_msize = mids->dma_slave.src_maxburst;
ctl_lo.ctlx.src_msize = mids->dma_slave.dst_maxburst;
/*
* Here we need some translation from "enum dma_slave_buswidth"
* to the format for our dma controller
* standard intel_mid_dmac's format
* 1 Byte 0b000
* 2 Bytes 0b001
* 4 Bytes 0b010
*/
ctl_lo.ctlx.dst_tr_width = mids->dma_slave.dst_addr_width / 2;
ctl_lo.ctlx.src_tr_width = mids->dma_slave.src_addr_width / 2;
if (mids->cfg_mode == LNW_DMA_MEM_TO_MEM) {
ctl_lo.ctlx.tt_fc = 0;
ctl_lo.ctlx.sinc = 0;
@ -746,8 +755,18 @@ static struct dma_async_tx_descriptor *intel_mid_dma_prep_slave_sg(
BUG_ON(!mids);
if (!midc->dma->pimr_mask) {
pr_debug("MDMA: SG list is not supported by this controller\n");
return NULL;
/* We can still handle sg list with only one item */
if (sg_len == 1) {
txd = intel_mid_dma_prep_memcpy(chan,
mids->dma_slave.dst_addr,
mids->dma_slave.src_addr,
sgl->length,
flags);
return txd;
} else {
pr_warn("MDMA: SG list is not supported by this controller\n");
return NULL;
}
}
pr_debug("MDMA: SG Length = %d, direction = %d, Flags = %#lx\n",
@ -758,6 +777,7 @@ static struct dma_async_tx_descriptor *intel_mid_dma_prep_slave_sg(
pr_err("MDMA: Prep memcpy failed\n");
return NULL;
}
desc = to_intel_mid_dma_desc(txd);
desc->dirn = direction;
ctl_lo.ctl_lo = desc->ctl_lo;