Re: [PATCH v8 01/11] PCI: imx6: Fix establish link failure in EP mode for iMX8MM and iMX8MP

Frank Li
2024-09-02T22:58:43Z

On Mon, Sep 02, 2024 at 03:59:34PM -0500, Bjorn Helgaas wrote:
> On Mon, Jul 29, 2024 at 04:18:08PM -0400, Frank Li wrote:
> > From: Richard Zhu <hongxing.zhu@nxp.com>
> >
> > Add IMX6_PCIE_FLAG_HAS_APP_RESET flag to IMX8MM_EP and IMX8MP_EP drvdata.
> > This flag was overlooked during code restructuring. It is crucial to
> > release the app-reset from the System Reset Controller before initiating
> > LTSSM to rectify the issue
>
> What exactly is the issue? What does it look like to a user? The
> endpoint doesn't establish a link correctly?

Yes. Link can't establish.

>
> > Fixes: 0c9651c21f2a ("PCI: imx6: Simplify reset handling by using *_FLAG_HAS_*_RESET")
> > Signed-off-by: Richard Zhu <hongxing.zhu@nxp.com>
> > Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
> > Signed-off-by: Frank Li <Frank.Li@nxp.com>
>
> Does this need a -stable tag?

Yes.

Do I need repost it?

Frank

>
> 0c9651c21f2a appeared in v6.9, but this could arguably be v6.11
> material if it fixes a serious issue.
>
> > ---
> > drivers/pci/controller/dwc/pci-imx6.c | 6 ++++--
> > 1 file changed, 4 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
> > index 964d67756eb2b..42fd17fbadfa5 100644
> > --- a/drivers/pci/controller/dwc/pci-imx6.c
> > +++ b/drivers/pci/controller/dwc/pci-imx6.c
> > @@ -1562,7 +1562,8 @@ static const struct imx6_pcie_drvdata drvdata[] = {
> > },
> > [IMX8MM_EP] = {
> > .variant = IMX8MM_EP,
> > - .flags = IMX6_PCIE_FLAG_HAS_PHYDRV,
> > + .flags = IMX6_PCIE_FLAG_HAS_APP_RESET |
> > + IMX6_PCIE_FLAG_HAS_PHYDRV,
> > .mode = DW_PCIE_EP_TYPE,
> > .gpr = "fsl,imx8mm-iomuxc-gpr",
> > .clk_names = imx8mm_clks,
> > @@ -1573,7 +1574,8 @@ static const struct imx6_pcie_drvdata drvdata[] = {
> > },
> > [IMX8MP_EP] = {
> > .variant = IMX8MP_EP,
> > - .flags = IMX6_PCIE_FLAG_HAS_PHYDRV,
> > + .flags = IMX6_PCIE_FLAG_HAS_APP_RESET |
> > + IMX6_PCIE_FLAG_HAS_PHYDRV,
> > .mode = DW_PCIE_EP_TYPE,
> > .gpr = "fsl,imx8mp-iomuxc-gpr",
> > .clk_names = imx8mm_clks,
> >
> > --
> > 2.34.1
> >