PCI: imx6: Skip waiting for L2/L3 Ready on i.MX6SX

[PATCH v1] PCI: imx6: Skip waiting for L2/L3 Ready on i.MX6SX

Posted by Richard Zhu 1 month, 2 weeks ago

On i.MX6SX, the LTSSM registers become inaccessible after the
PME_Turn_Off message is sent to the link. This prevents verification
of whether the link has successfully entered the L2/L3 Ready state.

Add a new flag 'IMX_PCIE_FLAG_SKIP_L23_READY' to skip the L2/L3 Ready
state check specifically for i.MX6SX PCIe controllers.

Fixes: a528d1a72597 ("PCI: imx6: Use DWC common suspend resume method")
Signed-off-by: Richard Zhu <hongxing.zhu@nxp.com>
Cc: stable@vger.kernel.org
---
 drivers/pci/controller/dwc/pci-imx6.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
index 2d01c21b5570..4385cb18e240 100644
--- a/drivers/pci/controller/dwc/pci-imx6.c
+++ b/drivers/pci/controller/dwc/pci-imx6.c
@@ -1871,6 +1871,7 @@ static const struct imx_pcie_drvdata drvdata[] = {
 		.variant = IMX6SX,
 		.flags = IMX_PCIE_FLAG_IMX_PHY |
 			 IMX_PCIE_FLAG_SPEED_CHANGE_WORKAROUND |
+			 IMX_PCIE_FLAG_SKIP_L23_READY |
 			 IMX_PCIE_FLAG_SUPPORTS_SUSPEND,
 		.gpr = "fsl,imx6q-iomuxc-gpr",
 		.ltssm_off = IOMUXC_GPR12,
-- 
2.37.1

Re: [PATCH v1] PCI: imx6: Skip waiting for L2/L3 Ready on i.MX6SX

Posted by Manivannan Sadhasivam 3 weeks, 1 day ago

On Sat, 28 Feb 2026 16:09:25 +0800, Richard Zhu wrote:
> On i.MX6SX, the LTSSM registers become inaccessible after the
> PME_Turn_Off message is sent to the link. This prevents verification
> of whether the link has successfully entered the L2/L3 Ready state.
> 
> Add a new flag 'IMX_PCIE_FLAG_SKIP_L23_READY' to skip the L2/L3 Ready
> state check specifically for i.MX6SX PCIe controllers.
> 
> [...]

Applied, thanks!

[1/1] PCI: imx6: Skip waiting for L2/L3 Ready on i.MX6SX
      commit: 5f73cf1db829c21b7fd44a8d2587cd395b1b2d76

Best regards,
-- 
Manivannan Sadhasivam <mani@kernel.org>

Re: [PATCH v1] PCI: imx6: Skip waiting for L2/L3 Ready on i.MX6SX

Posted by Frank Li 1 month ago

On Sat, Feb 28, 2026 at 04:09:25PM +0800, Richard Zhu wrote:
> On i.MX6SX, the LTSSM registers become inaccessible after the
> PME_Turn_Off message is sent to the link. This prevents verification
> of whether the link has successfully entered the L2/L3 Ready state.
>
> Add a new flag 'IMX_PCIE_FLAG_SKIP_L23_READY' to skip the L2/L3 Ready
> state check specifically for i.MX6SX PCIe controllers.
>
> Fixes: a528d1a72597 ("PCI: imx6: Use DWC common suspend resume method")
> Signed-off-by: Richard Zhu <hongxing.zhu@nxp.com>
> Cc: stable@vger.kernel.org
> ---

Reviewed-by: Frank Li <Frank.Li@nxp.com>
>  drivers/pci/controller/dwc/pci-imx6.c | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
> index 2d01c21b5570..4385cb18e240 100644
> --- a/drivers/pci/controller/dwc/pci-imx6.c
> +++ b/drivers/pci/controller/dwc/pci-imx6.c
> @@ -1871,6 +1871,7 @@ static const struct imx_pcie_drvdata drvdata[] = {
>  		.variant = IMX6SX,
>  		.flags = IMX_PCIE_FLAG_IMX_PHY |
>  			 IMX_PCIE_FLAG_SPEED_CHANGE_WORKAROUND |
> +			 IMX_PCIE_FLAG_SKIP_L23_READY |
>  			 IMX_PCIE_FLAG_SUPPORTS_SUSPEND,
>  		.gpr = "fsl,imx6q-iomuxc-gpr",
>  		.ltssm_off = IOMUXC_GPR12,
> --
> 2.37.1
>