On Fri, Sep 15, 2023 at 02:43:04PM -0400, Frank Li wrote:
> Difference layerscape chip have not difference exit_from_l2() method.
> Using function pointer for ls1028. It prepare for other layerscape
> suspend/resume support.
>
How about:
Since difference SoCs require different sequence for exiting L2, let's add a
separate "exit_from_l2()" callback. This callback can be used to execute SoC
specific sequence.
> Signed-off-by: Frank Li <Frank.Li@xxxxxxx>
> ---
> drivers/pci/controller/dwc/pci-layerscape.c | 7 +++++--
> 1 file changed, 5 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/pci/controller/dwc/pci-layerscape.c b/drivers/pci/controller/dwc/pci-layerscape.c
> index b931d597656f6..20c48c06e2248 100644
> --- a/drivers/pci/controller/dwc/pci-layerscape.c
> +++ b/drivers/pci/controller/dwc/pci-layerscape.c
> @@ -39,6 +39,8 @@
>
> struct ls_pcie_drvdata {
> const u32 pf_off;
> + const struct dw_pcie_host_ops *ops;
Where is this ops used? If this is added as a preparatory for next patches, I'd
suggest you to move it to the respective one instead to avoid confusion.
> + void (*exit_from_l2)(struct dw_pcie_rp *pp);
> bool pm_support;
> };
>
> @@ -180,6 +182,7 @@ static const struct ls_pcie_drvdata ls1021a_drvdata = {
> static const struct ls_pcie_drvdata layerscape_drvdata = {
> .pf_off = 0xc0000,
> .pm_support = true,
> + .exit_from_l2 = ls_pcie_exit_from_l2,
> };
>
> static const struct of_device_id ls_pcie_of_match[] = {
> @@ -213,7 +216,7 @@ static int ls_pcie_probe(struct platform_device *pdev)
> pcie->drvdata = of_device_get_match_data(dev);
>
> pci->dev = dev;
> - pci->pp.ops = &ls_pcie_host_ops;
> + pci->pp.ops = pcie->drvdata->ops ? pcie->drvdata->ops : &ls_pcie_host_ops;
This one also.
>
> pcie->pci = pci;
>
> @@ -251,7 +254,7 @@ static int ls_pcie_resume_noirq(struct device *dev)
> if (!pcie->drvdata->pm_support)
> return 0;
>
> - ls_pcie_exit_from_l2(&pcie->pci->pp);
> + pcie->drvdata->exit_from_l2(&pcie->pci->pp);
You should always check for the existence of the callback first before invoking
it.
- Mani
>
> return dw_pcie_resume_noirq(pcie->pci);
> }
> --
> 2.34.1
>
--
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