redonkable
/
alistair23-linux
1
0
Fork 0
Code Releases Activity

dw_dmac: utilize slave_id to pass request line 

There is slave_id field in the generic slave config structure that is dedicated
for the uniq slave number. In our case we have the request lines wired to the
certain hardware. Therefore the number of the request line is uniq and could be
used as slave_id. It allows us in some cases to drop out the usage of the
custom slave config structure.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Vinod Koul <vinod.koul@linux.intel.com>
hifive-unleashed-5.1
Andy Shevchenko 2012-09-03 13:46:19 +03:00 committed by Vinod Koul
parent f1a7757008
commit 8fccc5bfd7
1 changed files with 5 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
drivers/dma/dw_dmac.c
View File

@ -177,6 +177,11 @@ static void dwc_initialize(struct dw_dma_chan *dwc)
cfghi = dws->cfg_hi;
cfglo |= dws->cfg_lo & ~DWC_CFGL_CH_PRIOR_MASK;
} else {
if (dwc->dma_sconfig.direction == DMA_MEM_TO_DEV)
cfghi = DWC_CFGH_DST_PER(dwc->dma_sconfig.slave_id);
else if (dwc->dma_sconfig.direction == DMA_DEV_TO_MEM)
cfghi = DWC_CFGH_SRC_PER(dwc->dma_sconfig.slave_id);
}
channel_writel(dwc, CFG_LO, cfglo);