Add support for setting of two-bit field that allows selection of 4x
lane PCIe which was previously limited to only 2x lanes.
Signed-off-by: Matt Ranostay <mranostay@xxxxxx>
Reviewed-by: Vignesh Raghavendra <vigneshr@xxxxxx>
---
drivers/pci/controller/cadence/pci-j721e.c | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)
diff --git a/drivers/pci/controller/cadence/pci-j721e.c b/drivers/pci/controller/cadence/pci-j721e.c
index 875224d34958..efd065bc0104 100644
--- a/drivers/pci/controller/cadence/pci-j721e.c
+++ b/drivers/pci/controller/cadence/pci-j721e.c
@@ -43,7 +43,6 @@ enum link_status {
};
#define J721E_MODE_RC BIT(7)
-#define LANE_COUNT_MASK BIT(8)
#define LANE_COUNT(n) ((n) << 8)
#define GENERATION_SEL_MASK GENMASK(1, 0)
@@ -53,6 +52,7 @@ struct j721e_pcie {
struct clk *refclk;
u32 mode;
u32 num_lanes;
+ u32 max_lanes;
void __iomem *user_cfg_base;
void __iomem *intd_cfg_base;
u32 linkdown_irq_regfield;
@@ -206,11 +206,15 @@ static int j721e_pcie_set_lane_count(struct j721e_pcie *pcie,
{
struct device *dev = pcie->cdns_pcie->dev;
u32 lanes = pcie->num_lanes;
+ u32 mask = GENMASK(8, 8);
u32 val = 0;
int ret;
+ if (pcie->max_lanes == 4)
+ mask = GENMASK(9, 8);
+
val = LANE_COUNT(lanes - 1);
- ret = regmap_update_bits(syscon, offset, LANE_COUNT_MASK, val);
+ ret = regmap_update_bits(syscon, offset, mask, val);
if (ret)
dev_err(dev, "failed to set link count\n");
@@ -440,6 +444,8 @@ static int j721e_pcie_probe(struct platform_device *pdev)
ret = of_property_read_u32(node, "num-lanes", &num_lanes);
if (ret || num_lanes > data->max_lanes)
num_lanes = 1;
+
+ pcie->max_lanes = data->max_lanes;
pcie->num_lanes = num_lanes;
if (dma_set_mask_and_coherent(dev, DMA_BIT_MASK(48)))
--
2.38.GIT
