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

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Message-ID: <ZUPjaKOeBzZ9EUvg@lizhi-Precision-Tower-5810>
Date:   Thu, 2 Nov 2023 14:01:06 -0400
From:   Frank Li <Frank.li@....com>
To:     Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
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 Thu, Nov 02, 2023 at 10:28:08PM +0530, Manivannan Sadhasivam wrote:
> 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.

How about add below?

"Change ls_pcie_exit_from_l2() return value from void to int. Return error
when exit_from_l2() failure to exit suspend flow."

Frank


> 
> > 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
> > 
> 
> -- 
> மணிவண்ணன் சதாசிவம்