| Message ID | 20240216-dw-hdma-v2-1-b42329003f43@linaro.org |
|---|---|
| State | New |
| 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 order to add support for Hyper DMA (HDMA), let's refactor the existing > dw_pcie_edma_find_chip() API by moving the common code to separate > functions. > > No functional change. > > Suggested-by: Serge Semin <fancer.lancer@gmail.com> > Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> > --- > drivers/pci/controller/dwc/pcie-designware.c | 40 +++++++++++++++++++++++----- > 1 file changed, 33 insertions(+), 7 deletions(-) > > diff --git a/drivers/pci/controller/dwc/pcie-designware.c b/drivers/pci/controller/dwc/pcie-designware.c > index 250cf7f40b85..3a26dfc5368f 100644 > --- a/drivers/pci/controller/dwc/pcie-designware.c > +++ b/drivers/pci/controller/dwc/pcie-designware.c > @@ -880,7 +880,17 @@ static struct dw_edma_plat_ops dw_pcie_edma_ops = { > .irq_vector = dw_pcie_edma_irq_vector, > }; > > -static int dw_pcie_edma_find_chip(struct dw_pcie *pci) > +static void dw_pcie_edma_init_data(struct dw_pcie *pci) > +{ > + pci->edma.dev = pci->dev; > + > + if (!pci->edma.ops) > + pci->edma.ops = &dw_pcie_edma_ops; > + > + pci->edma.flags |= DW_EDMA_CHIP_LOCAL; > +} > + > +static int dw_pcie_edma_find_mf(struct dw_pcie *pci) > { > u32 val; > > @@ -902,8 +912,6 @@ static int dw_pcie_edma_find_chip(struct dw_pcie *pci) > > if (val == 0xFFFFFFFF && pci->edma.reg_base) { > pci->edma.mf = EDMA_MF_EDMA_UNROLL; > - > - val = dw_pcie_readl_dma(pci, PCIE_DMA_CTRL); > } else if (val != 0xFFFFFFFF) { > pci->edma.mf = EDMA_MF_EDMA_LEGACY; Minor suggestion: The above section prior to this patch was: if (val == 0xFFFFFFFF && pci->edma.reg_base) { pci->edma.mf = EDMA_MF_EDMA_UNROLL; val = dw_pcie_readl_dma(pci, PCIE_DMA_CTRL); } else if (val != 0xFFFFFFFF) { pci->edma.mf = EDMA_MF_EDMA_LEGACY; pci->edma.reg_base = pci->dbi_base + PCIE_DMA_VIEWPORT_BASE; } else { return -ENODEV; } And this patch is removing the call to dw_pcie_readl_dma() in the "if" condition above. So the curly braces after this patch will only be present because of the "else if" statement. So is the following change a good idea? /* Assume it is EDMA_LEGACY by default but update it later if needed */ pci->edma.mf = EDMA_MF_EDMA_LEGACY; if (val == 0xFFFFFFFF && pci->edma.reg_base) pci->edma.mf = EDMA_MF_EDMA_UNROLL; else if (val != 0xFFFFFFFF) pci->edma.reg_base = pci->dbi_base + PCIE_DMA_VIEWPORT_BASE; else return -ENODEV; Regards, Siddharth.
On Tue, Feb 20, 2024 at 05:41:41PM +0530, Siddharth Vadapalli wrote: > On 24/02/16 11:04PM, Manivannan Sadhasivam wrote: > > In order to add support for Hyper DMA (HDMA), let's refactor the existing > > dw_pcie_edma_find_chip() API by moving the common code to separate > > functions. > > > > No functional change. > > > > Suggested-by: Serge Semin <fancer.lancer@gmail.com> > > Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> > > --- > > drivers/pci/controller/dwc/pcie-designware.c | 40 +++++++++++++++++++++++----- > > 1 file changed, 33 insertions(+), 7 deletions(-) > > > > diff --git a/drivers/pci/controller/dwc/pcie-designware.c b/drivers/pci/controller/dwc/pcie-designware.c > > index 250cf7f40b85..3a26dfc5368f 100644 > > --- a/drivers/pci/controller/dwc/pcie-designware.c > > +++ b/drivers/pci/controller/dwc/pcie-designware.c > > @@ -880,7 +880,17 @@ static struct dw_edma_plat_ops dw_pcie_edma_ops = { > > .irq_vector = dw_pcie_edma_irq_vector, > > }; > > > > -static int dw_pcie_edma_find_chip(struct dw_pcie *pci) > > +static void dw_pcie_edma_init_data(struct dw_pcie *pci) > > +{ > > + pci->edma.dev = pci->dev; > > + > > + if (!pci->edma.ops) > > + pci->edma.ops = &dw_pcie_edma_ops; > > + > > + pci->edma.flags |= DW_EDMA_CHIP_LOCAL; > > +} > > + > > +static int dw_pcie_edma_find_mf(struct dw_pcie *pci) > > { > > u32 val; > > > > @@ -902,8 +912,6 @@ static int dw_pcie_edma_find_chip(struct dw_pcie *pci) > > > > if (val == 0xFFFFFFFF && pci->edma.reg_base) { > > pci->edma.mf = EDMA_MF_EDMA_UNROLL; > > - > > - val = dw_pcie_readl_dma(pci, PCIE_DMA_CTRL); > > } else if (val != 0xFFFFFFFF) { > > pci->edma.mf = EDMA_MF_EDMA_LEGACY; > > Minor suggestion: > > The above section prior to this patch was: > if (val == 0xFFFFFFFF && pci->edma.reg_base) { > pci->edma.mf = EDMA_MF_EDMA_UNROLL; > > val = dw_pcie_readl_dma(pci, PCIE_DMA_CTRL); > } else if (val != 0xFFFFFFFF) { > pci->edma.mf = EDMA_MF_EDMA_LEGACY; > > pci->edma.reg_base = pci->dbi_base + PCIE_DMA_VIEWPORT_BASE; > } else { > return -ENODEV; > } > > And this patch is removing the call to dw_pcie_readl_dma() in the "if" > condition above. So the curly braces after this patch will only be > present because of the "else if" statement. So is the following change a > good idea? > Yes indeed. Actually, EDMA_MF_EDMA_LEGACY is the default mapping format (because its value is 0x0), but setting it explicitly would also make sense. - Mani
diff --git a/drivers/pci/controller/dwc/pcie-designware.c b/drivers/pci/controller/dwc/pcie-designware.c index 250cf7f40b85..3a26dfc5368f 100644 --- a/drivers/pci/controller/dwc/pcie-designware.c +++ b/drivers/pci/controller/dwc/pcie-designware.c @@ -880,7 +880,17 @@ static struct dw_edma_plat_ops dw_pcie_edma_ops = { .irq_vector = dw_pcie_edma_irq_vector, }; -static int dw_pcie_edma_find_chip(struct dw_pcie *pci) +static void dw_pcie_edma_init_data(struct dw_pcie *pci) +{ + pci->edma.dev = pci->dev; + + if (!pci->edma.ops) + pci->edma.ops = &dw_pcie_edma_ops; + + pci->edma.flags |= DW_EDMA_CHIP_LOCAL; +} + +static int dw_pcie_edma_find_mf(struct dw_pcie *pci) { u32 val; @@ -902,8 +912,6 @@ static int dw_pcie_edma_find_chip(struct dw_pcie *pci) if (val == 0xFFFFFFFF && pci->edma.reg_base) { pci->edma.mf = EDMA_MF_EDMA_UNROLL; - - val = dw_pcie_readl_dma(pci, PCIE_DMA_CTRL); } else if (val != 0xFFFFFFFF) { pci->edma.mf = EDMA_MF_EDMA_LEGACY; @@ -912,12 +920,17 @@ static int dw_pcie_edma_find_chip(struct dw_pcie *pci) return -ENODEV; } - pci->edma.dev = pci->dev; + return 0; +} - if (!pci->edma.ops) - pci->edma.ops = &dw_pcie_edma_ops; +static int dw_pcie_edma_find_channels(struct dw_pcie *pci) +{ + u32 val; - pci->edma.flags |= DW_EDMA_CHIP_LOCAL; + 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); @@ -930,6 +943,19 @@ static int dw_pcie_edma_find_chip(struct dw_pcie *pci) return 0; } +static int dw_pcie_edma_find_chip(struct dw_pcie *pci) +{ + int ret; + + dw_pcie_edma_init_data(pci); + + ret = dw_pcie_edma_find_mf(pci); + if (ret) + return ret; + + return dw_pcie_edma_find_channels(pci); +} + static int dw_pcie_edma_irq_verify(struct dw_pcie *pci) { struct platform_device *pdev = to_platform_device(pci->dev);
In order to add support for Hyper DMA (HDMA), let's refactor the existing dw_pcie_edma_find_chip() API by moving the common code to separate functions. No functional change. Suggested-by: Serge Semin <fancer.lancer@gmail.com> Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> --- drivers/pci/controller/dwc/pcie-designware.c | 40 +++++++++++++++++++++++----- 1 file changed, 33 insertions(+), 7 deletions(-)