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| author | Andy Shevchenko <andriy.shevchenko@linux.intel.com> | 2015-09-28 18:57:03 +0300 |
|---|---|---|
| committer | Vinod Koul <vinod.koul@intel.com> | 2015-09-30 13:42:02 +0530 |
| commit | 6bea0f6d1c47b07be88dfd93f013ae05fcb3d8bf (patch) | |
| tree | 101b7803013771335da6245edffd0152d5b0ac81 /drivers/dma | |
| parent | ee08b59d47d859ed0a11ab331a3fbc5ab3b56100 (diff) | |
| download | linux-stable-6bea0f6d1c47b07be88dfd93f013ae05fcb3d8bf.tar.gz linux-stable-6bea0f6d1c47b07be88dfd93f013ae05fcb3d8bf.tar.bz2 linux-stable-6bea0f6d1c47b07be88dfd93f013ae05fcb3d8bf.zip | |
dmaengine: dw: properly read DWC_PARAMS register
In case we have less than maximum allowed channels (8) and autoconfiguration is
enabled the DWC_PARAMS read is wrong because it uses different arithmetic to
what is needed for channel priority setup.
Re-do the caclulations properly. This now works on AVR32 board well.
Fixes: fed2574b3c9f (dw_dmac: introduce software emulation of LLP transfers)
Cc: yitian.bu@tangramtek.com
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Diffstat (limited to 'drivers/dma')
| -rw-r--r-- | drivers/dma/dw/core.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/dma/dw/core.c b/drivers/dma/dw/core.c index cf1c87fa1edd..bedce038c6e2 100644 --- a/drivers/dma/dw/core.c +++ b/drivers/dma/dw/core.c @@ -1591,7 +1591,6 @@ int dw_dma_probe(struct dw_dma_chip *chip, struct dw_dma_platform_data *pdata) INIT_LIST_HEAD(&dw->dma.channels); for (i = 0; i < nr_channels; i++) { struct dw_dma_chan *dwc = &dw->chan[i]; - int r = nr_channels - i - 1; dwc->chan.device = &dw->dma; dma_cookie_init(&dwc->chan); @@ -1603,7 +1602,7 @@ int dw_dma_probe(struct dw_dma_chip *chip, struct dw_dma_platform_data *pdata) /* 7 is highest priority & 0 is lowest. */ if (pdata->chan_priority == CHAN_PRIORITY_ASCENDING) - dwc->priority = r; + dwc->priority = nr_channels - i - 1; else dwc->priority = i; @@ -1622,6 +1621,7 @@ int dw_dma_probe(struct dw_dma_chip *chip, struct dw_dma_platform_data *pdata) /* Hardware configuration */ if (autocfg) { unsigned int dwc_params; + unsigned int r = DW_DMA_MAX_NR_CHANNELS - i - 1; void __iomem *addr = chip->regs + r * sizeof(u32); dwc_params = dma_read_byaddr(addr, DWC_PARAMS); |