From: Frank Wunderlich <frank-w@xxxxxxxxxxxxxxx>
PCIe Lanes can be split to 2 slots with bifurcation.
Add support for this in existing PCIe driver that can be enabled
by new "bifurcation" devicetree property.
Co-developed-by: Peter Geis <pgwipeout@xxxxxxxxx>
Signed-off-by: Frank Wunderlich <frank-w@xxxxxxxxxxxxxxx>
---
changes in v2:
- change rockchip,bifurcation to vendor unspecific bifurcation
---
drivers/pci/controller/dwc/pcie-dw-rockchip.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/drivers/pci/controller/dwc/pcie-dw-rockchip.c b/drivers/pci/controller/dwc/pcie-dw-rockchip.c
index b00832d653ea..79e909df241c 100644
--- a/drivers/pci/controller/dwc/pcie-dw-rockchip.c
+++ b/drivers/pci/controller/dwc/pcie-dw-rockchip.c
@@ -20,6 +20,7 @@
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/reset.h>
+#include <linux/phy/pcie.h>
#include "pcie-designware.h"
@@ -58,6 +59,7 @@ struct rockchip_pcie {
struct gpio_desc *rst_gpio;
struct regulator *vpcie3v3;
struct irq_domain *irq_domain;
+ bool bifurcation;
};
static int rockchip_pcie_readl_apb(struct rockchip_pcie *rockchip,
@@ -259,6 +261,12 @@ static int rockchip_pcie_phy_init(struct rockchip_pcie *rockchip)
return dev_err_probe(dev, PTR_ERR(rockchip->phy),
"missing PHY\n");
+ if (rockchip->bifurcation) {
+ ret = phy_set_mode_ext(rockchip->phy, PHY_MODE_PCIE, PHY_MODE_PCIE_BIFURCATION);
+ if (ret)
+ return ret;
+ }
+
ret = phy_init(rockchip->phy);
if (ret < 0)
return ret;
@@ -319,6 +327,9 @@ static int rockchip_pcie_probe(struct platform_device *pdev)
}
}
+ if (device_property_read_bool(dev, "bifurcation"))
+ rockchip->bifurcation = true;
+
ret = rockchip_pcie_phy_init(rockchip);
if (ret)
goto disable_regulator;
--
2.25.1
