| Message ID | 20240216-dw-hdma-v2-2-b42329003f43@linaro.org (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
| Series | PCI: dwc: Add support for integrating HDMA with DWC EP driver | expand |
On 24/02/16 11:04PM, Manivannan Sadhasivam wrote: > In the case of Hyper DMA (HDMA) present in DWC controllers, there is no way > the drivers can auto detect the number of read/write channels as like its > predecessor embedded DMA (eDMA). So the glue drivers making use of HDMA > have to pass the channels count during probe. > > To accommodate that, let's skip finding the channels if the channels count > were already passed by glue drivers. If the channels count passed were > wrong in any form, then the existing sanity check will catch it. > > Suggested-by: Serge Semin <fancer.lancer@gmail.com> > Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> Reviewed-by: Siddharth Vadapalli <s-vadapalli@ti.com> Regards, Siddharth. > --- > drivers/pci/controller/dwc/pcie-designware.c | 16 +++++++++------- > 1 file changed, 9 insertions(+), 7 deletions(-) > > diff --git a/drivers/pci/controller/dwc/pcie-designware.c b/drivers/pci/controller/dwc/pcie-designware.c > index 3a26dfc5368f..d07747b75947 100644 > --- a/drivers/pci/controller/dwc/pcie-designware.c > +++ b/drivers/pci/controller/dwc/pcie-designware.c > @@ -927,13 +927,15 @@ static int dw_pcie_edma_find_channels(struct dw_pcie *pci) > { > u32 val; > > - if (pci->edma.mf == EDMA_MF_EDMA_LEGACY) > - val = dw_pcie_readl_dbi(pci, PCIE_DMA_VIEWPORT_BASE + PCIE_DMA_CTRL); > - else > - val = dw_pcie_readl_dma(pci, PCIE_DMA_CTRL); > - > - pci->edma.ll_wr_cnt = FIELD_GET(PCIE_DMA_NUM_WR_CHAN, val); > - pci->edma.ll_rd_cnt = FIELD_GET(PCIE_DMA_NUM_RD_CHAN, val); > + if (!pci->edma.ll_wr_cnt || !pci->edma.ll_rd_cnt) { > + if (pci->edma.mf == EDMA_MF_EDMA_LEGACY) > + val = dw_pcie_readl_dbi(pci, PCIE_DMA_VIEWPORT_BASE + PCIE_DMA_CTRL); > + else > + val = dw_pcie_readl_dma(pci, PCIE_DMA_CTRL); > + > + pci->edma.ll_wr_cnt = FIELD_GET(PCIE_DMA_NUM_WR_CHAN, val); > + pci->edma.ll_rd_cnt = FIELD_GET(PCIE_DMA_NUM_RD_CHAN, val); > + } > > /* Sanity check the channels count if the mapping was incorrect */ > if (!pci->edma.ll_wr_cnt || pci->edma.ll_wr_cnt > EDMA_MAX_WR_CH || > > -- > 2.25.1 > >
diff --git a/drivers/pci/controller/dwc/pcie-designware.c b/drivers/pci/controller/dwc/pcie-designware.c index 3a26dfc5368f..d07747b75947 100644 --- a/drivers/pci/controller/dwc/pcie-designware.c +++ b/drivers/pci/controller/dwc/pcie-designware.c @@ -927,13 +927,15 @@ static int dw_pcie_edma_find_channels(struct dw_pcie *pci) { u32 val; - if (pci->edma.mf == EDMA_MF_EDMA_LEGACY) - val = dw_pcie_readl_dbi(pci, PCIE_DMA_VIEWPORT_BASE + PCIE_DMA_CTRL); - else - val = dw_pcie_readl_dma(pci, PCIE_DMA_CTRL); - - pci->edma.ll_wr_cnt = FIELD_GET(PCIE_DMA_NUM_WR_CHAN, val); - pci->edma.ll_rd_cnt = FIELD_GET(PCIE_DMA_NUM_RD_CHAN, val); + if (!pci->edma.ll_wr_cnt || !pci->edma.ll_rd_cnt) { + if (pci->edma.mf == EDMA_MF_EDMA_LEGACY) + val = dw_pcie_readl_dbi(pci, PCIE_DMA_VIEWPORT_BASE + PCIE_DMA_CTRL); + else + val = dw_pcie_readl_dma(pci, PCIE_DMA_CTRL); + + pci->edma.ll_wr_cnt = FIELD_GET(PCIE_DMA_NUM_WR_CHAN, val); + pci->edma.ll_rd_cnt = FIELD_GET(PCIE_DMA_NUM_RD_CHAN, val); + } /* Sanity check the channels count if the mapping was incorrect */ if (!pci->edma.ll_wr_cnt || pci->edma.ll_wr_cnt > EDMA_MAX_WR_CH ||
In the case of Hyper DMA (HDMA) present in DWC controllers, there is no way the drivers can auto detect the number of read/write channels as like its predecessor embedded DMA (eDMA). So the glue drivers making use of HDMA have to pass the channels count during probe. To accommodate that, let's skip finding the channels if the channels count were already passed by glue drivers. If the channels count passed were wrong in any form, then the existing sanity check will catch it. Suggested-by: Serge Semin <fancer.lancer@gmail.com> Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> --- drivers/pci/controller/dwc/pcie-designware.c | 16 +++++++++------- 1 file changed, 9 insertions(+), 7 deletions(-)