| Message ID | 20220426132139.26761-11-linux@fw-web.de (mailing list archive) |
|---|---|
| State | Superseded |
| Delegated to: | Lorenzo Pieralisi |
| Headers | show |
| Series | RK3568 PCIe V3 support | expand |
The subject line should be "PCI: rockchip-dwc: Add ..." so there's no need to mention "rockchip" again. No need to mention "pcie driver" either, because that's obvious from the context, so just something like: PCI: rockchip-dwc: Add lane-map support On Tue, Apr 26, 2022 at 03:21:38PM +0200, Frank Wunderlich wrote: > From: Frank Wunderlich <frank-w@public-files.de> > > Add a basic lane-map to define which PCIe lanes should be > used with this controller. > > Rockchip driver uses this for bifurcation (true/false) based > on lanes should be splitted across controllers or not. > > On rk3568 there are 2 PCIe Controllers which share PCIe lanes. > > pcie3x1: pcie@fe270000 //lane1 when using 1+1 > pcie3x2: pcie@fe280000 //lane0 when using 1+1 > > This ends up in one Controller (pcie3x1) uses lane-map = <0 1>; and > the other lane-map = <1 0>; (pcie3x2) > > This means there are 2 lanes (count of numbers), one (by position) > is mapped to the first controller, the other one is used on the other > controller. > > In this driver the lane-map is simply converted to the bifurcation > bool instead of direct mapping a specific lane to a controller. > > Signed-off-by: Frank Wunderlich <frank-w@public-files.de> > --- > v2: > - new patch > --- > drivers/pci/controller/dwc/pcie-dw-rockchip.c | 15 +++++++++++++-- > 1 file changed, 13 insertions(+), 2 deletions(-) > > diff --git a/drivers/pci/controller/dwc/pcie-dw-rockchip.c b/drivers/pci/controller/dwc/pcie-dw-rockchip.c > index 79e909df241c..21cb697a5be1 100644 > --- a/drivers/pci/controller/dwc/pcie-dw-rockchip.c > +++ b/drivers/pci/controller/dwc/pcie-dw-rockchip.c > @@ -60,6 +60,7 @@ struct rockchip_pcie { > struct regulator *vpcie3v3; > struct irq_domain *irq_domain; > bool bifurcation; > + u32 lane_map[2]; > }; > > static int rockchip_pcie_readl_apb(struct rockchip_pcie *rockchip, > @@ -293,8 +294,10 @@ static int rockchip_pcie_probe(struct platform_device *pdev) > { > struct device *dev = &pdev->dev; > struct rockchip_pcie *rockchip; > + unsigned int lanecnt = 0; > struct pcie_port *pp; > int ret; > + int len; > > rockchip = devm_kzalloc(dev, sizeof(*rockchip), GFP_KERNEL); > if (!rockchip) > @@ -327,8 +330,16 @@ static int rockchip_pcie_probe(struct platform_device *pdev) > } > } > > - if (device_property_read_bool(dev, "bifurcation")) > - rockchip->bifurcation = true; Skip adding the "bifurcation" DT support completely if you can. > + len = of_property_read_variable_u32_array(dev->of_node, "lane-map", rockchip->lane_map, > + 2, ARRAY_SIZE(rockchip->lane_map)); > + > + for (int i = 0; i < len; i++) > + if (rockchip->lane_map[i]) > + lanecnt++; > + > + rockchip->bifurcation = ((lanecnt > 0) && (lanecnt != len)); > + > + dev_info(dev, "bifurcation: %s\n", rockchip->bifurcation ? "true" : "false"); > > ret = rockchip_pcie_phy_init(rockchip); > if (ret) > -- > 2.25.1 > > > -- > linux-phy mailing list > linux-phy@lists.infradead.org > https://lists.infradead.org/mailman/listinfo/linux-phy
diff --git a/drivers/pci/controller/dwc/pcie-dw-rockchip.c b/drivers/pci/controller/dwc/pcie-dw-rockchip.c index 79e909df241c..21cb697a5be1 100644 --- a/drivers/pci/controller/dwc/pcie-dw-rockchip.c +++ b/drivers/pci/controller/dwc/pcie-dw-rockchip.c @@ -60,6 +60,7 @@ struct rockchip_pcie { struct regulator *vpcie3v3; struct irq_domain *irq_domain; bool bifurcation; + u32 lane_map[2]; }; static int rockchip_pcie_readl_apb(struct rockchip_pcie *rockchip, @@ -293,8 +294,10 @@ static int rockchip_pcie_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct rockchip_pcie *rockchip; + unsigned int lanecnt = 0; struct pcie_port *pp; int ret; + int len; rockchip = devm_kzalloc(dev, sizeof(*rockchip), GFP_KERNEL); if (!rockchip) @@ -327,8 +330,16 @@ static int rockchip_pcie_probe(struct platform_device *pdev) } } - if (device_property_read_bool(dev, "bifurcation")) - rockchip->bifurcation = true; + len = of_property_read_variable_u32_array(dev->of_node, "lane-map", rockchip->lane_map, + 2, ARRAY_SIZE(rockchip->lane_map)); + + for (int i = 0; i < len; i++) + if (rockchip->lane_map[i]) + lanecnt++; + + rockchip->bifurcation = ((lanecnt > 0) && (lanecnt != len)); + + dev_info(dev, "bifurcation: %s\n", rockchip->bifurcation ? "true" : "false"); ret = rockchip_pcie_phy_init(rockchip); if (ret)