diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/dma/dw/core.c | 11 | ||||
| -rw-r--r-- | drivers/dma/dw/regs.h | 1 |
2 files changed, 11 insertions, 1 deletions
diff --git a/drivers/dma/dw/core.c b/drivers/dma/dw/core.c index 21cb2a58dbd2..33e99d95b3d3 100644 --- a/drivers/dma/dw/core.c +++ b/drivers/dma/dw/core.c @@ -1178,8 +1178,17 @@ int do_dma_probe(struct dw_dma_chip *chip) */ dwc->block_size = (4 << ((pdata->block_size >> 4 * i) & 0xf)) - 1; + + /* + * According to the DW DMA databook the true scatter- + * gether LLPs aren't available if either multi-block + * config is disabled (CHx_MULTI_BLK_EN == 0) or the + * LLP register is hard-coded to zeros + * (CHx_HC_LLP == 1). + */ dwc->nollp = - (dwc_params >> DWC_PARAMS_MBLK_EN & 0x1) == 0; + (dwc_params >> DWC_PARAMS_MBLK_EN & 0x1) == 0 || + (dwc_params >> DWC_PARAMS_HC_LLP & 0x1) == 1; } else { dwc->block_size = pdata->block_size; dwc->nollp = !pdata->multi_block[i]; diff --git a/drivers/dma/dw/regs.h b/drivers/dma/dw/regs.h index 3fce66ecee7a..1ab840b06e79 100644 --- a/drivers/dma/dw/regs.h +++ b/drivers/dma/dw/regs.h @@ -125,6 +125,7 @@ struct dw_dma_regs { /* Bitfields in DWC_PARAMS */ #define DWC_PARAMS_MBLK_EN 11 /* multi block transfer */ +#define DWC_PARAMS_HC_LLP 13 /* set LLP register to zero */ /* bursts size */ enum dw_dma_msize { |