linux-kernel - Re: [PATCH v3 1/4] PCI: layerscape: Add function pointer for exit_from

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Message-ID: <20231102165808.GC20943@thinkpad>
Date:   Thu, 2 Nov 2023 22:28:08 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     Frank Li <Frank.Li@....com>
Cc:     bhelgaas@...gle.com, imx@...ts.linux.dev, kw@...ux.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-pci@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        lpieralisi@...nel.org, minghuan.Lian@....com, mingkai.hu@....com,
        robh@...nel.org, roy.zang@....com
Subject: Re: [PATCH v3 1/4] PCI: layerscape: Add function pointer for
 exit_from_l2()

On Tue, Oct 17, 2023 at 03:31:42PM -0400, Frank Li wrote:
> 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.
> 

I missed the fact that this patch honors the return value of the callback (which
was ignored previously). So this should be added to the description as well.

> Signed-off-by: Frank Li <Frank.Li@....com>

With that,

Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>

- Mani

> ---
> 
> Notes:
>     Change from v2 to v3
>     - fixed according to mani's feedback
>       1. update commit message
>       2. move dw_pcie_host_ops to next patch
>       3. check return value from exit_from_l2()
>     Change from v1 to v2
>     - change subject 'a' to 'A'
>     
>     Change from v1 to v2
>     - change subject 'a' to 'A'
> 
>  drivers/pci/controller/dwc/pci-layerscape.c | 11 +++++++++--
>  1 file changed, 9 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/pci/controller/dwc/pci-layerscape.c b/drivers/pci/controller/dwc/pci-layerscape.c
> index 37956e09c65bd..aea89926bcc4f 100644
> --- a/drivers/pci/controller/dwc/pci-layerscape.c
> +++ b/drivers/pci/controller/dwc/pci-layerscape.c
> @@ -39,6 +39,7 @@
>  
>  struct ls_pcie_drvdata {
>  	const u32 pf_off;
> +	int (*exit_from_l2)(struct dw_pcie_rp *pp);
>  	bool pm_support;
>  };
>  
> @@ -125,7 +126,7 @@ static void ls_pcie_send_turnoff_msg(struct dw_pcie_rp *pp)
>  		dev_err(pcie->pci->dev, "PME_Turn_off timeout\n");
>  }
>  
> -static void ls_pcie_exit_from_l2(struct dw_pcie_rp *pp)
> +static int ls_pcie_exit_from_l2(struct dw_pcie_rp *pp)
>  {
>  	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
>  	struct ls_pcie *pcie = to_ls_pcie(pci);
> @@ -150,6 +151,8 @@ static void ls_pcie_exit_from_l2(struct dw_pcie_rp *pp)
>  				 10000);
>  	if (ret)
>  		dev_err(pcie->pci->dev, "L2 exit timeout\n");
> +
> +	return ret;
>  }
>  
>  static int ls_pcie_host_init(struct dw_pcie_rp *pp)
> @@ -180,6 +183,7 @@ 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[] = {
> @@ -247,11 +251,14 @@ static int ls_pcie_suspend_noirq(struct device *dev)
>  static int ls_pcie_resume_noirq(struct device *dev)
>  {
>  	struct ls_pcie *pcie = dev_get_drvdata(dev);
> +	int ret;
>  
>  	if (!pcie->drvdata->pm_support)
>  		return 0;
>  
> -	ls_pcie_exit_from_l2(&pcie->pci->pp);
> +	ret = pcie->drvdata->exit_from_l2(&pcie->pci->pp);
> +	if (ret)
> +		return ret;
>  
>  	return dw_pcie_resume_noirq(pcie->pci);
>  }
> -- 
> 2.34.1
> 

-- 
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