On Thu, Aug 15, 2024 at 06:57:19PM -0400, Jim Quinlan wrote:
> The 7712 SOC adds a software init reset device for the PCIe HW.
> If found in the DT node, use it.
>
> Signed-off-by: Jim Quinlan <james.quinlan@xxxxxxxxxxxx>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxx>
- Mani
> ---
> drivers/pci/controller/pcie-brcmstb.c | 24 ++++++++++++++++++++++++
> 1 file changed, 24 insertions(+)
>
> diff --git a/drivers/pci/controller/pcie-brcmstb.c b/drivers/pci/controller/pcie-brcmstb.c
> index af14debd81d0..aa21c4c7b7f7 100644
> --- a/drivers/pci/controller/pcie-brcmstb.c
> +++ b/drivers/pci/controller/pcie-brcmstb.c
> @@ -266,6 +266,7 @@ struct brcm_pcie {
> struct reset_control *rescal;
> struct reset_control *perst_reset;
> struct reset_control *bridge_reset;
> + struct reset_control *swinit_reset;
> int num_memc;
> u64 memc_size[PCIE_BRCM_MAX_MEMC];
> u32 hw_rev;
> @@ -1633,12 +1634,35 @@ static int brcm_pcie_probe(struct platform_device *pdev)
> if (IS_ERR(pcie->bridge_reset))
> return PTR_ERR(pcie->bridge_reset);
>
> + pcie->swinit_reset = devm_reset_control_get_optional_exclusive(&pdev->dev, "swinit");
> + if (IS_ERR(pcie->swinit_reset))
> + return PTR_ERR(pcie->swinit_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);
>
> + if (pcie->swinit_reset) {
> + ret = reset_control_assert(pcie->swinit_reset);
> + if (ret) {
> + clk_disable_unprepare(pcie->clk);
> + return dev_err_probe(&pdev->dev, ret,
> + "could not assert reset 'swinit'\n");
> + }
> +
> + /* HW team recommends 1us for proper sync and propagation of reset */
> + udelay(1);
> +
> + ret = reset_control_deassert(pcie->swinit_reset);
> + if (ret) {
> + clk_disable_unprepare(pcie->clk);
> + return dev_err_probe(&pdev->dev, ret,
> + "could not de-assert reset 'swinit'\n");
> + }
> + }
> +
> ret = reset_control_reset(pcie->rescal);
> if (ret) {
> clk_disable_unprepare(pcie->clk);
> --
> 2.17.1
>
--
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