Hi Jim,
On 8/1/24 01:28, Jim Quinlan wrote:
> The 7712 SOC has a bridge reset which can be described in the device tree.
> Use it if present. Otherwise, continue to use the legacy method to reset
> the bridge.
>
> Signed-off-by: Jim Quinlan <james.quinlan@xxxxxxxxxxxx>
> ---
> drivers/pci/controller/pcie-brcmstb.c | 24 +++++++++++++++++++-----
> 1 file changed, 19 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/pci/controller/pcie-brcmstb.c b/drivers/pci/controller/pcie-brcmstb.c
> index 7595e7009192..4d68fe318178 100644
> --- a/drivers/pci/controller/pcie-brcmstb.c
> +++ b/drivers/pci/controller/pcie-brcmstb.c
> @@ -265,6 +265,7 @@ struct brcm_pcie {
> enum pcie_type type;
> struct reset_control *rescal;
> struct reset_control *perst_reset;
> + struct reset_control *bridge_reset;
> int num_memc;
> u64 memc_size[PCIE_BRCM_MAX_MEMC];
> u32 hw_rev;
> @@ -732,12 +733,19 @@ static void __iomem *brcm7425_pcie_map_bus(struct pci_bus *bus,
>
> static void brcm_pcie_bridge_sw_init_set_generic(struct brcm_pcie *pcie, u32 val)
> {
> - u32 tmp, mask = RGR1_SW_INIT_1_INIT_GENERIC_MASK;
> - u32 shift = RGR1_SW_INIT_1_INIT_GENERIC_SHIFT;
> + if (val)
> + reset_control_assert(pcie->bridge_reset);
> + else
> + reset_control_deassert(pcie->bridge_reset);
>
> - tmp = readl(pcie->base + PCIE_RGR1_SW_INIT_1(pcie));
> - tmp = (tmp & ~mask) | ((val << shift) & mask);
> - writel(tmp, pcie->base + PCIE_RGR1_SW_INIT_1(pcie));
> + if (!pcie->bridge_reset) {
> + u32 tmp, mask = RGR1_SW_INIT_1_INIT_GENERIC_MASK;
> + u32 shift = RGR1_SW_INIT_1_INIT_GENERIC_SHIFT;
> +
> + tmp = readl(pcie->base + PCIE_RGR1_SW_INIT_1(pcie));
> + tmp = (tmp & ~mask) | ((val << shift) & mask);
> + writel(tmp, pcie->base + PCIE_RGR1_SW_INIT_1(pcie));
> + }
> }
>
> static void brcm_pcie_bridge_sw_init_set_7278(struct brcm_pcie *pcie, u32 val)
> @@ -1621,10 +1629,16 @@ static int brcm_pcie_probe(struct platform_device *pdev)
> if (IS_ERR(pcie->perst_reset))
> return PTR_ERR(pcie->perst_reset);
>
> + pcie->bridge_reset = devm_reset_control_get_optional_exclusive(&pdev->dev, "bridge");
Shouldn't this be devm_reset_control_get_optional_shared? See more below.
> + if (IS_ERR(pcie->bridge_reset))
> + return PTR_ERR(pcie->bridge_reset);
> +
> ret = clk_prepare_enable(pcie->clk);
> if (ret)
> return dev_err_probe(&pdev->dev, ret, "could not enable clock\n");
>
> + pcie->bridge_sw_init_set(pcie, 0);
According to reset_control_get_shared description looks like this
.deassert is satisfying the requirements for _shared reset-control API
variant.
Is that the intention to call reset_control_deassert() here?
> +
> ret = reset_control_reset(pcie->rescal);
> if (dev_err_probe(&pdev->dev, ret, "failed to deassert 'rescal'\n"))
> goto clk_disable_unprepare;
~Stan
