diff mbox series

[v3,1/4] PCI: layerscape: Add function pointer for exit_from_l2()

Message ID 20231017193145.3198380-2-Frank.Li@nxp.com
State New
Headers show
Series PCI: layerscape: Add suspend/resume support for ls1043 and ls1021 | expand

Commit Message

Frank Li Oct. 17, 2023, 7:31 p.m. UTC 
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@nxp.com>
---

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(-)

Comments

Manivannan Sadhasivam Nov. 2, 2023, 4:58 p.m. UTC | #1 
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@nxp.com>

With that,

Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.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
>
Frank Li Nov. 2, 2023, 6:01 p.m. UTC | #2 
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@nxp.com>
> 
> With that,
> 
> Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.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
diff mbox series

Patch

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);
 }