[PATCH v4] PCI: imx6: Add suspend/resume support for i.MX6QDL

[PATCH v4] PCI: imx6: Add suspend/resume support for i.MX6QDL

[Stefan Eichenberger]

From: Stefan Eichenberger <stefan.eichenberger@toradex.com>

The suspend/resume functionality is currently broken on the i.MX6QDL
platform, as documented in the NXP errata (ERR005723):
https://www.nxp.com/docs/en/errata/IMX6DQCE.pdf

This patch addresses the issue by sharing most of the suspend/resume
sequences used by other i.MX devices, while avoiding modifications to
critical registers that disrupt the PCIe functionality. It targets the
same problem as the following downstream commit:
https://github.com/nxp-imx/linux-imx/commit/4e92355e1f79d225ea842511fcfd42b343b32995

Unlike the downstream commit, this patch also resets the connected PCIe
device if possible. Without this reset, certain drivers, such as ath10k
or iwlwifi, will crash on resume. The device reset is also done by the
driver on other i.MX platforms, making this patch consistent with
existing practices.

Without this patch, suspend/resume will fail on i.MX6QDL devices if a
PCIe device is connected. Upon resuming, the kernel will hang and
display an error. Here's an example of the error encountered with the
ath10k driver:
ath10k_pci 0000:01:00.0: Unable to change power state from D3hot to D0, device inaccessible
Unhandled fault: imprecise external abort (0x1406) at 0x0106f944

Signed-off-by: Stefan Eichenberger <stefan.eichenberger@toradex.com>
---
Changes in v4:
- Improve commit message (Bjorn)
- Fix style issue on comments (Bjorn)
- s/msi/MSI (Bjorn)

Changes in v3:
- Added a new flag to the driver data to indicate that the suspend/resume
  is broken on the i.MX6QDL platform. (Frank)
- Fix comments to be more relevant (Mani)
- Use imx_pcie_assert_core_reset in suspend (Mani)

 drivers/pci/controller/dwc/pci-imx6.c | 57 +++++++++++++++++++++------
 1 file changed, 46 insertions(+), 11 deletions(-)

diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
index 808d1f1054173..c8d5c90aa4d45 100644
--- a/drivers/pci/controller/dwc/pci-imx6.c
+++ b/drivers/pci/controller/dwc/pci-imx6.c
@@ -82,6 +82,11 @@ enum imx_pcie_variants {
 #define IMX_PCIE_FLAG_HAS_SERDES		BIT(6)
 #define IMX_PCIE_FLAG_SUPPORT_64BIT		BIT(7)
 #define IMX_PCIE_FLAG_CPU_ADDR_FIXUP		BIT(8)
+/*
+ * Because of ERR005723 (PCIe does not support L2 power down) we need to
+ * workaround suspend resume on some devices which are affected by this errata.
+ */
+#define IMX_PCIE_FLAG_BROKEN_SUSPEND		BIT(9)
 
 #define imx_check_flag(pci, val)	(pci->drvdata->flags & val)
 
@@ -1237,9 +1242,19 @@ static int imx_pcie_suspend_noirq(struct device *dev)
 		return 0;
 
 	imx_pcie_msi_save_restore(imx_pcie, true);
-	imx_pcie_pm_turnoff(imx_pcie);
-	imx_pcie_stop_link(imx_pcie->pci);
-	imx_pcie_host_exit(pp);
+	if (imx_check_flag(imx_pcie, IMX_PCIE_FLAG_BROKEN_SUSPEND)) {
+		/*
+		 * The minimum for a workaround would be to set PERST# and to
+		 * set the PCIE_TEST_PD flag. However, we can also disable the
+		 * clock which saves some power.
+		 */
+		imx_pcie_assert_core_reset(imx_pcie);
+		imx_pcie->drvdata->enable_ref_clk(imx_pcie, false);
+	} else {
+		imx_pcie_pm_turnoff(imx_pcie);
+		imx_pcie_stop_link(imx_pcie->pci);
+		imx_pcie_host_exit(pp);
+	}
 
 	return 0;
 }
@@ -1253,14 +1268,32 @@ static int imx_pcie_resume_noirq(struct device *dev)
 	if (!(imx_pcie->drvdata->flags & IMX_PCIE_FLAG_SUPPORTS_SUSPEND))
 		return 0;
 
-	ret = imx_pcie_host_init(pp);
-	if (ret)
-		return ret;
-	imx_pcie_msi_save_restore(imx_pcie, false);
-	dw_pcie_setup_rc(pp);
+	if (imx_check_flag(imx_pcie, IMX_PCIE_FLAG_BROKEN_SUSPEND)) {
+		ret = imx_pcie->drvdata->enable_ref_clk(imx_pcie, true);
+		if (ret)
+			return ret;
+		ret = imx_pcie_deassert_core_reset(imx_pcie);
+		if (ret)
+			return ret;
+		/*
+		 * Using PCIE_TEST_PD seems to disable MSI and powers down the
+		 * root complex. This is why we have to setup the rc again and
+		 * why we have to restore the MSI register.
+		 */
+		ret = dw_pcie_setup_rc(&imx_pcie->pci->pp);
+		if (ret)
+			return ret;
+		imx_pcie_msi_save_restore(imx_pcie, false);
+	} else {
+		ret = imx_pcie_host_init(pp);
+		if (ret)
+			return ret;
+		imx_pcie_msi_save_restore(imx_pcie, false);
+		dw_pcie_setup_rc(pp);
 
-	if (imx_pcie->link_is_up)
-		imx_pcie_start_link(imx_pcie->pci);
+		if (imx_pcie->link_is_up)
+			imx_pcie_start_link(imx_pcie->pci);
+	}
 
 	return 0;
 }
@@ -1485,7 +1518,9 @@ static const struct imx_pcie_drvdata drvdata[] = {
 	[IMX6Q] = {
 		.variant = IMX6Q,
 		.flags = IMX_PCIE_FLAG_IMX_PHY |
-			 IMX_PCIE_FLAG_IMX_SPEED_CHANGE,
+			 IMX_PCIE_FLAG_IMX_SPEED_CHANGE |
+			 IMX_PCIE_FLAG_BROKEN_SUSPEND |
+			 IMX_PCIE_FLAG_SUPPORTS_SUSPEND,
 		.dbi_length = 0x200,
 		.gpr = "fsl,imx6q-iomuxc-gpr",
 		.clk_names = imx6q_clks,
-- 
2.43.0

Re: [PATCH v4] PCI: imx6: Add suspend/resume support for i.MX6QDL

[Bjorn Helgaas]

On Wed, Oct 30, 2024 at 11:32:45AM +0100, Stefan Eichenberger wrote:
> From: Stefan Eichenberger <stefan.eichenberger@toradex.com>
> 
> The suspend/resume functionality is currently broken on the i.MX6QDL
> platform, as documented in the NXP errata (ERR005723):
> https://www.nxp.com/docs/en/errata/IMX6DQCE.pdf
> 
> This patch addresses the issue by sharing most of the suspend/resume
> sequences used by other i.MX devices, while avoiding modifications to
> critical registers that disrupt the PCIe functionality. It targets the
> same problem as the following downstream commit:
> https://github.com/nxp-imx/linux-imx/commit/4e92355e1f79d225ea842511fcfd42b343b32995
> 
> Unlike the downstream commit, this patch also resets the connected PCIe
> device if possible. Without this reset, certain drivers, such as ath10k
> or iwlwifi, will crash on resume. The device reset is also done by the
> driver on other i.MX platforms, making this patch consistent with
> existing practices.
> 
> Without this patch, suspend/resume will fail on i.MX6QDL devices if a
> PCIe device is connected. Upon resuming, the kernel will hang and
> display an error. Here's an example of the error encountered with the
> ath10k driver:
> ath10k_pci 0000:01:00.0: Unable to change power state from D3hot to D0, device inaccessible
> Unhandled fault: imprecise external abort (0x1406) at 0x0106f944
> 
> Signed-off-by: Stefan Eichenberger <stefan.eichenberger@toradex.com>

Richard and Lucas, does this look OK to you?  Since you're listed as
maintainers of pci-imx6.c, I'd like to have your ack before merging
this.

> ---
> Changes in v4:
> - Improve commit message (Bjorn)
> - Fix style issue on comments (Bjorn)
> - s/msi/MSI (Bjorn)
> 
> Changes in v3:
> - Added a new flag to the driver data to indicate that the suspend/resume
>   is broken on the i.MX6QDL platform. (Frank)
> - Fix comments to be more relevant (Mani)
> - Use imx_pcie_assert_core_reset in suspend (Mani)
> 
>  drivers/pci/controller/dwc/pci-imx6.c | 57 +++++++++++++++++++++------
>  1 file changed, 46 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
> index 808d1f1054173..c8d5c90aa4d45 100644
> --- a/drivers/pci/controller/dwc/pci-imx6.c
> +++ b/drivers/pci/controller/dwc/pci-imx6.c
> @@ -82,6 +82,11 @@ enum imx_pcie_variants {
>  #define IMX_PCIE_FLAG_HAS_SERDES		BIT(6)
>  #define IMX_PCIE_FLAG_SUPPORT_64BIT		BIT(7)
>  #define IMX_PCIE_FLAG_CPU_ADDR_FIXUP		BIT(8)
> +/*
> + * Because of ERR005723 (PCIe does not support L2 power down) we need to
> + * workaround suspend resume on some devices which are affected by this errata.
> + */
> +#define IMX_PCIE_FLAG_BROKEN_SUSPEND		BIT(9)
>  
>  #define imx_check_flag(pci, val)	(pci->drvdata->flags & val)
>  
> @@ -1237,9 +1242,19 @@ static int imx_pcie_suspend_noirq(struct device *dev)
>  		return 0;
>  
>  	imx_pcie_msi_save_restore(imx_pcie, true);
> -	imx_pcie_pm_turnoff(imx_pcie);
> -	imx_pcie_stop_link(imx_pcie->pci);
> -	imx_pcie_host_exit(pp);
> +	if (imx_check_flag(imx_pcie, IMX_PCIE_FLAG_BROKEN_SUSPEND)) {
> +		/*
> +		 * The minimum for a workaround would be to set PERST# and to
> +		 * set the PCIE_TEST_PD flag. However, we can also disable the
> +		 * clock which saves some power.
> +		 */
> +		imx_pcie_assert_core_reset(imx_pcie);
> +		imx_pcie->drvdata->enable_ref_clk(imx_pcie, false);
> +	} else {
> +		imx_pcie_pm_turnoff(imx_pcie);
> +		imx_pcie_stop_link(imx_pcie->pci);
> +		imx_pcie_host_exit(pp);
> +	}
>  
>  	return 0;
>  }
> @@ -1253,14 +1268,32 @@ static int imx_pcie_resume_noirq(struct device *dev)
>  	if (!(imx_pcie->drvdata->flags & IMX_PCIE_FLAG_SUPPORTS_SUSPEND))
>  		return 0;
>  
> -	ret = imx_pcie_host_init(pp);
> -	if (ret)
> -		return ret;
> -	imx_pcie_msi_save_restore(imx_pcie, false);
> -	dw_pcie_setup_rc(pp);
> +	if (imx_check_flag(imx_pcie, IMX_PCIE_FLAG_BROKEN_SUSPEND)) {
> +		ret = imx_pcie->drvdata->enable_ref_clk(imx_pcie, true);
> +		if (ret)
> +			return ret;
> +		ret = imx_pcie_deassert_core_reset(imx_pcie);
> +		if (ret)
> +			return ret;
> +		/*
> +		 * Using PCIE_TEST_PD seems to disable MSI and powers down the
> +		 * root complex. This is why we have to setup the rc again and
> +		 * why we have to restore the MSI register.
> +		 */
> +		ret = dw_pcie_setup_rc(&imx_pcie->pci->pp);
> +		if (ret)
> +			return ret;
> +		imx_pcie_msi_save_restore(imx_pcie, false);
> +	} else {
> +		ret = imx_pcie_host_init(pp);
> +		if (ret)
> +			return ret;
> +		imx_pcie_msi_save_restore(imx_pcie, false);
> +		dw_pcie_setup_rc(pp);
>  
> -	if (imx_pcie->link_is_up)
> -		imx_pcie_start_link(imx_pcie->pci);
> +		if (imx_pcie->link_is_up)
> +			imx_pcie_start_link(imx_pcie->pci);
> +	}
>  
>  	return 0;
>  }
> @@ -1485,7 +1518,9 @@ static const struct imx_pcie_drvdata drvdata[] = {
>  	[IMX6Q] = {
>  		.variant = IMX6Q,
>  		.flags = IMX_PCIE_FLAG_IMX_PHY |
> -			 IMX_PCIE_FLAG_IMX_SPEED_CHANGE,
> +			 IMX_PCIE_FLAG_IMX_SPEED_CHANGE |
> +			 IMX_PCIE_FLAG_BROKEN_SUSPEND |
> +			 IMX_PCIE_FLAG_SUPPORTS_SUSPEND,
>  		.dbi_length = 0x200,
>  		.gpr = "fsl,imx6q-iomuxc-gpr",
>  		.clk_names = imx6q_clks,
> -- 
> 2.43.0
> 

Re: [PATCH v4] PCI: imx6: Add suspend/resume support for i.MX6QDL

[Krzysztof Wilczyński]

Hello,

[...]
> > Without this patch, suspend/resume will fail on i.MX6QDL devices if a
> > PCIe device is connected. Upon resuming, the kernel will hang and
> > display an error. Here's an example of the error encountered with the
> > ath10k driver:
> > ath10k_pci 0000:01:00.0: Unable to change power state from D3hot to D0, device inaccessible
> > Unhandled fault: imprecise external abort (0x1406) at 0x0106f944
> [...]
> 
> Richard and Lucas, does this look OK to you?  Since you're listed as
> maintainers of pci-imx6.c, I'd like to have your ack before merging
> this.

If things look fine here, then I would like to pick it up.

	Krzysztof

Re: [PATCH v4] PCI: imx6: Add suspend/resume support for i.MX6QDL

[Manivannan Sadhasivam]

On Sat, Nov 02, 2024 at 09:04:03PM +0900, Krzysztof Wilczyński wrote:
> Hello,
> 
> [...]
> > > Without this patch, suspend/resume will fail on i.MX6QDL devices if a
> > > PCIe device is connected. Upon resuming, the kernel will hang and
> > > display an error. Here's an example of the error encountered with the
> > > ath10k driver:
> > > ath10k_pci 0000:01:00.0: Unable to change power state from D3hot to D0, device inaccessible
> > > Unhandled fault: imprecise external abort (0x1406) at 0x0106f944
> > [...]
> > 
> > Richard and Lucas, does this look OK to you?  Since you're listed as
> > maintainers of pci-imx6.c, I'd like to have your ack before merging
> > this.
> 
> If things look fine here, then I would like to pick it up.
> 

LGTM, feel free to pick it up.

- Mani

-- 
மணிவண்ணன் சதாசிவம்

Re: [PATCH v4] PCI: imx6: Add suspend/resume support for i.MX6QDL

[Krzysztof Wilczyński]

Hello,

> > [...]
> > > > Without this patch, suspend/resume will fail on i.MX6QDL devices if a
> > > > PCIe device is connected. Upon resuming, the kernel will hang and
> > > > display an error. Here's an example of the error encountered with the
> > > > ath10k driver:
> > > > ath10k_pci 0000:01:00.0: Unable to change power state from D3hot to D0, device inaccessible
> > > > Unhandled fault: imprecise external abort (0x1406) at 0x0106f944
> > > [...]
> > > 
> > > Richard and Lucas, does this look OK to you?  Since you're listed as
> > > maintainers of pci-imx6.c, I'd like to have your ack before merging
> > > this.
> > 
> > If things look fine here, then I would like to pick it up.
> > 
> 
> LGTM, feel free to pick it up.

Sounds good!  Thank you!

	Krzysztof

RE: [PATCH v4] PCI: imx6: Add suspend/resume support for i.MX6QDL

[Hongxing Zhu]

> -----Original Message-----
> From: Bjorn Helgaas <helgaas@kernel.org>
> Sent: 2024年11月2日 3:34
> To: Stefan Eichenberger <eichest@gmail.com>; Hongxing Zhu
> <hongxing.zhu@nxp.com>; Lucas Stach <l.stach@pengutronix.de>
> Cc: lpieralisi@kernel.org; kw@linux.com; manivannan.sadhasivam@linaro.org;
> robh@kernel.org; bhelgaas@google.com; shawnguo@kernel.org;
> s.hauer@pengutronix.de; kernel@pengutronix.de; festevam@gmail.com;
> Francesco Dolcini <francesco.dolcini@toradex.com>; Frank Li
> <frank.li@nxp.com>; linux-pci@vger.kernel.org;
> linux-arm-kernel@lists.infradead.org; imx@lists.linux.dev;
> linux-kernel@vger.kernel.org; Stefan Eichenberger
> <stefan.eichenberger@toradex.com>
> Subject: Re: [PATCH v4] PCI: imx6: Add suspend/resume support for i.MX6QDL
> 
> On Wed, Oct 30, 2024 at 11:32:45AM +0100, Stefan Eichenberger wrote:
> > From: Stefan Eichenberger <stefan.eichenberger@toradex.com>
> >
> > The suspend/resume functionality is currently broken on the i.MX6QDL
> > platform, as documented in the NXP errata (ERR005723):
> > https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.
> >
> nxp.com%2Fdocs%2Fen%2Ferrata%2FIMX6DQCE.pdf&data=05%7C02%7Chong
> xing.zh
> >
> u%40nxp.com%7C9039460e3cf54773efcd08dcfaac2bc7%7C686ea1d3bc2b4c6f
> a92cd
> >
> 99c5c301635%7C0%7C0%7C638660864604098652%7CUnknown%7CTWFpbGZs
> b3d8eyJWI
> >
> joiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C0%
> 7C%7
> >
> C%7C&sdata=WACKwvUPlTZJcxjkLe7YI3ZnITtxEj6wULhMndh8zNE%3D&reserv
> ed=0
> >
> > This patch addresses the issue by sharing most of the suspend/resume
> > sequences used by other i.MX devices, while avoiding modifications to
> > critical registers that disrupt the PCIe functionality. It targets the
> > same problem as the following downstream commit:
> > https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgith
> >
> ub.com%2Fnxp-imx%2Flinux-imx%2Fcommit%2F4e92355e1f79d225ea842511fc
> fd42
> >
> b343b32995&data=05%7C02%7Chongxing.zhu%40nxp.com%7C9039460e3cf54
> 773efc
> >
> d08dcfaac2bc7%7C686ea1d3bc2b4c6fa92cd99c5c301635%7C0%7C0%7C63866
> 086460
> >
> 4121904%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2lu
> MzIiLC
> >
> JBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C0%7C%7C%7C&sdata=tafoT8ug4EehGXrE
> NzQOb%
> > 2F7rD%2Fra8%2BefnAEiV%2FB8Afc%3D&reserved=0
> >
> > Unlike the downstream commit, this patch also resets the connected
> > PCIe device if possible. Without this reset, certain drivers, such as
> > ath10k or iwlwifi, will crash on resume. The device reset is also done
> > by the driver on other i.MX platforms, making this patch consistent
> > with existing practices.
> >
> > Without this patch, suspend/resume will fail on i.MX6QDL devices if a
> > PCIe device is connected. Upon resuming, the kernel will hang and
> > display an error. Here's an example of the error encountered with the
> > ath10k driver:
> > ath10k_pci 0000:01:00.0: Unable to change power state from D3hot to
> > D0, device inaccessible Unhandled fault: imprecise external abort
> > (0x1406) at 0x0106f944
> >
> > Signed-off-by: Stefan Eichenberger <stefan.eichenberger@toradex.com>
> 
> Richard and Lucas, does this look OK to you?  Since you're listed as maintainers
> of pci-imx6.c, I'd like to have your ack before merging this.
> 
Sorry to reply late.
I'm fine with that.
Thanks.
Acked-by: Richard Zhu <hongxing.zhu@nxp.com>

Best Regards
Richard Zhu
> > ---
> > Changes in v4:
> > - Improve commit message (Bjorn)
> > - Fix style issue on comments (Bjorn)
> > - s/msi/MSI (Bjorn)
> >
> > Changes in v3:
> > - Added a new flag to the driver data to indicate that the suspend/resume
> >   is broken on the i.MX6QDL platform. (Frank)
> > - Fix comments to be more relevant (Mani)
> > - Use imx_pcie_assert_core_reset in suspend (Mani)
> >
> >  drivers/pci/controller/dwc/pci-imx6.c | 57
> > +++++++++++++++++++++------
> >  1 file changed, 46 insertions(+), 11 deletions(-)
> >
> > diff --git a/drivers/pci/controller/dwc/pci-imx6.c
> > b/drivers/pci/controller/dwc/pci-imx6.c
> > index 808d1f1054173..c8d5c90aa4d45 100644
> > --- a/drivers/pci/controller/dwc/pci-imx6.c
> > +++ b/drivers/pci/controller/dwc/pci-imx6.c
> > @@ -82,6 +82,11 @@ enum imx_pcie_variants {
> >  #define IMX_PCIE_FLAG_HAS_SERDES		BIT(6)
> >  #define IMX_PCIE_FLAG_SUPPORT_64BIT		BIT(7)
> >  #define IMX_PCIE_FLAG_CPU_ADDR_FIXUP		BIT(8)
> > +/*
> > + * Because of ERR005723 (PCIe does not support L2 power down) we need
> > +to
> > + * workaround suspend resume on some devices which are affected by this
> errata.
> > + */
> > +#define IMX_PCIE_FLAG_BROKEN_SUSPEND		BIT(9)
> >
> >  #define imx_check_flag(pci, val)	(pci->drvdata->flags & val)
> >
> > @@ -1237,9 +1242,19 @@ static int imx_pcie_suspend_noirq(struct device
> *dev)
> >  		return 0;
> >
> >  	imx_pcie_msi_save_restore(imx_pcie, true);
> > -	imx_pcie_pm_turnoff(imx_pcie);
> > -	imx_pcie_stop_link(imx_pcie->pci);
> > -	imx_pcie_host_exit(pp);
> > +	if (imx_check_flag(imx_pcie, IMX_PCIE_FLAG_BROKEN_SUSPEND)) {
> > +		/*
> > +		 * The minimum for a workaround would be to set PERST# and to
> > +		 * set the PCIE_TEST_PD flag. However, we can also disable the
> > +		 * clock which saves some power.
> > +		 */
> > +		imx_pcie_assert_core_reset(imx_pcie);
> > +		imx_pcie->drvdata->enable_ref_clk(imx_pcie, false);
> > +	} else {
> > +		imx_pcie_pm_turnoff(imx_pcie);
> > +		imx_pcie_stop_link(imx_pcie->pci);
> > +		imx_pcie_host_exit(pp);
> > +	}
> >
> >  	return 0;
> >  }
> > @@ -1253,14 +1268,32 @@ static int imx_pcie_resume_noirq(struct device
> *dev)
> >  	if (!(imx_pcie->drvdata->flags & IMX_PCIE_FLAG_SUPPORTS_SUSPEND))
> >  		return 0;
> >
> > -	ret = imx_pcie_host_init(pp);
> > -	if (ret)
> > -		return ret;
> > -	imx_pcie_msi_save_restore(imx_pcie, false);
> > -	dw_pcie_setup_rc(pp);
> > +	if (imx_check_flag(imx_pcie, IMX_PCIE_FLAG_BROKEN_SUSPEND)) {
> > +		ret = imx_pcie->drvdata->enable_ref_clk(imx_pcie, true);
> > +		if (ret)
> > +			return ret;
> > +		ret = imx_pcie_deassert_core_reset(imx_pcie);
> > +		if (ret)
> > +			return ret;
> > +		/*
> > +		 * Using PCIE_TEST_PD seems to disable MSI and powers down the
> > +		 * root complex. This is why we have to setup the rc again and
> > +		 * why we have to restore the MSI register.
> > +		 */
> > +		ret = dw_pcie_setup_rc(&imx_pcie->pci->pp);
> > +		if (ret)
> > +			return ret;
> > +		imx_pcie_msi_save_restore(imx_pcie, false);
> > +	} else {
> > +		ret = imx_pcie_host_init(pp);
> > +		if (ret)
> > +			return ret;
> > +		imx_pcie_msi_save_restore(imx_pcie, false);
> > +		dw_pcie_setup_rc(pp);
> >
> > -	if (imx_pcie->link_is_up)
> > -		imx_pcie_start_link(imx_pcie->pci);
> > +		if (imx_pcie->link_is_up)
> > +			imx_pcie_start_link(imx_pcie->pci);
> > +	}
> >
> >  	return 0;
> >  }
> > @@ -1485,7 +1518,9 @@ static const struct imx_pcie_drvdata drvdata[] = {
> >  	[IMX6Q] = {
> >  		.variant = IMX6Q,
> >  		.flags = IMX_PCIE_FLAG_IMX_PHY |
> > -			 IMX_PCIE_FLAG_IMX_SPEED_CHANGE,
> > +			 IMX_PCIE_FLAG_IMX_SPEED_CHANGE |
> > +			 IMX_PCIE_FLAG_BROKEN_SUSPEND |
> > +			 IMX_PCIE_FLAG_SUPPORTS_SUSPEND,
> >  		.dbi_length = 0x200,
> >  		.gpr = "fsl,imx6q-iomuxc-gpr",
> >  		.clk_names = imx6q_clks,
> > --
> > 2.43.0
> >

Re: [PATCH v4] PCI: imx6: Add suspend/resume support for i.MX6QDL

[Manivannan Sadhasivam]

On Wed, Oct 30, 2024 at 11:32:45AM +0100, Stefan Eichenberger wrote:
> From: Stefan Eichenberger <stefan.eichenberger@toradex.com>
> 
> The suspend/resume functionality is currently broken on the i.MX6QDL
> platform, as documented in the NXP errata (ERR005723):
> https://www.nxp.com/docs/en/errata/IMX6DQCE.pdf
> 
> This patch addresses the issue by sharing most of the suspend/resume
> sequences used by other i.MX devices, while avoiding modifications to
> critical registers that disrupt the PCIe functionality. It targets the
> same problem as the following downstream commit:
> https://github.com/nxp-imx/linux-imx/commit/4e92355e1f79d225ea842511fcfd42b343b32995
> 
> Unlike the downstream commit, this patch also resets the connected PCIe
> device if possible. Without this reset, certain drivers, such as ath10k
> or iwlwifi, will crash on resume. The device reset is also done by the
> driver on other i.MX platforms, making this patch consistent with
> existing practices.
> 
> Without this patch, suspend/resume will fail on i.MX6QDL devices if a
> PCIe device is connected. Upon resuming, the kernel will hang and
> display an error. Here's an example of the error encountered with the
> ath10k driver:
> ath10k_pci 0000:01:00.0: Unable to change power state from D3hot to D0, device inaccessible
> Unhandled fault: imprecise external abort (0x1406) at 0x0106f944
> 
> Signed-off-by: Stefan Eichenberger <stefan.eichenberger@toradex.com>

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

- Mani

> ---
> Changes in v4:
> - Improve commit message (Bjorn)
> - Fix style issue on comments (Bjorn)
> - s/msi/MSI (Bjorn)
> 
> Changes in v3:
> - Added a new flag to the driver data to indicate that the suspend/resume
>   is broken on the i.MX6QDL platform. (Frank)
> - Fix comments to be more relevant (Mani)
> - Use imx_pcie_assert_core_reset in suspend (Mani)
> 
>  drivers/pci/controller/dwc/pci-imx6.c | 57 +++++++++++++++++++++------
>  1 file changed, 46 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
> index 808d1f1054173..c8d5c90aa4d45 100644
> --- a/drivers/pci/controller/dwc/pci-imx6.c
> +++ b/drivers/pci/controller/dwc/pci-imx6.c
> @@ -82,6 +82,11 @@ enum imx_pcie_variants {
>  #define IMX_PCIE_FLAG_HAS_SERDES		BIT(6)
>  #define IMX_PCIE_FLAG_SUPPORT_64BIT		BIT(7)
>  #define IMX_PCIE_FLAG_CPU_ADDR_FIXUP		BIT(8)
> +/*
> + * Because of ERR005723 (PCIe does not support L2 power down) we need to
> + * workaround suspend resume on some devices which are affected by this errata.
> + */
> +#define IMX_PCIE_FLAG_BROKEN_SUSPEND		BIT(9)
>  
>  #define imx_check_flag(pci, val)	(pci->drvdata->flags & val)
>  
> @@ -1237,9 +1242,19 @@ static int imx_pcie_suspend_noirq(struct device *dev)
>  		return 0;
>  
>  	imx_pcie_msi_save_restore(imx_pcie, true);
> -	imx_pcie_pm_turnoff(imx_pcie);
> -	imx_pcie_stop_link(imx_pcie->pci);
> -	imx_pcie_host_exit(pp);
> +	if (imx_check_flag(imx_pcie, IMX_PCIE_FLAG_BROKEN_SUSPEND)) {
> +		/*
> +		 * The minimum for a workaround would be to set PERST# and to
> +		 * set the PCIE_TEST_PD flag. However, we can also disable the
> +		 * clock which saves some power.
> +		 */
> +		imx_pcie_assert_core_reset(imx_pcie);
> +		imx_pcie->drvdata->enable_ref_clk(imx_pcie, false);
> +	} else {
> +		imx_pcie_pm_turnoff(imx_pcie);
> +		imx_pcie_stop_link(imx_pcie->pci);
> +		imx_pcie_host_exit(pp);
> +	}
>  
>  	return 0;
>  }
> @@ -1253,14 +1268,32 @@ static int imx_pcie_resume_noirq(struct device *dev)
>  	if (!(imx_pcie->drvdata->flags & IMX_PCIE_FLAG_SUPPORTS_SUSPEND))
>  		return 0;
>  
> -	ret = imx_pcie_host_init(pp);
> -	if (ret)
> -		return ret;
> -	imx_pcie_msi_save_restore(imx_pcie, false);
> -	dw_pcie_setup_rc(pp);
> +	if (imx_check_flag(imx_pcie, IMX_PCIE_FLAG_BROKEN_SUSPEND)) {
> +		ret = imx_pcie->drvdata->enable_ref_clk(imx_pcie, true);
> +		if (ret)
> +			return ret;
> +		ret = imx_pcie_deassert_core_reset(imx_pcie);
> +		if (ret)
> +			return ret;
> +		/*
> +		 * Using PCIE_TEST_PD seems to disable MSI and powers down the
> +		 * root complex. This is why we have to setup the rc again and
> +		 * why we have to restore the MSI register.
> +		 */
> +		ret = dw_pcie_setup_rc(&imx_pcie->pci->pp);
> +		if (ret)
> +			return ret;
> +		imx_pcie_msi_save_restore(imx_pcie, false);
> +	} else {
> +		ret = imx_pcie_host_init(pp);
> +		if (ret)
> +			return ret;
> +		imx_pcie_msi_save_restore(imx_pcie, false);
> +		dw_pcie_setup_rc(pp);
>  
> -	if (imx_pcie->link_is_up)
> -		imx_pcie_start_link(imx_pcie->pci);
> +		if (imx_pcie->link_is_up)
> +			imx_pcie_start_link(imx_pcie->pci);
> +	}
>  
>  	return 0;
>  }
> @@ -1485,7 +1518,9 @@ static const struct imx_pcie_drvdata drvdata[] = {
>  	[IMX6Q] = {
>  		.variant = IMX6Q,
>  		.flags = IMX_PCIE_FLAG_IMX_PHY |
> -			 IMX_PCIE_FLAG_IMX_SPEED_CHANGE,
> +			 IMX_PCIE_FLAG_IMX_SPEED_CHANGE |
> +			 IMX_PCIE_FLAG_BROKEN_SUSPEND |
> +			 IMX_PCIE_FLAG_SUPPORTS_SUSPEND,
>  		.dbi_length = 0x200,
>  		.gpr = "fsl,imx6q-iomuxc-gpr",
>  		.clk_names = imx6q_clks,
> -- 
> 2.43.0
> 

-- 
மணிவண்ணன் சதாசிவம்

Re: [PATCH v4] PCI: imx6: Add suspend/resume support for i.MX6QDL

[Krzysztof Wilczyński]

Hello,

> The suspend/resume functionality is currently broken on the i.MX6QDL
> platform, as documented in the NXP errata (ERR005723):
> https://www.nxp.com/docs/en/errata/IMX6DQCE.pdf
> 
> This patch addresses the issue by sharing most of the suspend/resume
> sequences used by other i.MX devices, while avoiding modifications to
> critical registers that disrupt the PCIe functionality. It targets the
> same problem as the following downstream commit:
> https://github.com/nxp-imx/linux-imx/commit/4e92355e1f79d225ea842511fcfd42b343b32995
> 
> Unlike the downstream commit, this patch also resets the connected PCIe
> device if possible. Without this reset, certain drivers, such as ath10k
> or iwlwifi, will crash on resume. The device reset is also done by the
> driver on other i.MX platforms, making this patch consistent with
> existing practices.
> 
> Without this patch, suspend/resume will fail on i.MX6QDL devices if a
> PCIe device is connected. Upon resuming, the kernel will hang and
> display an error. Here's an example of the error encountered with the
> ath10k driver:
> ath10k_pci 0000:01:00.0: Unable to change power state from D3hot to D0, device inaccessible
> Unhandled fault: imprecise external abort (0x1406) at 0x0106f944

Applied to controller/imx6, thank you!

[01/01] PCI: imx6: Fix suspend/resume support on i.MX6QDL
        https://git.kernel.org/pci/pci/c/1a2a9024f84d

	Krzysztof