On Wed, Jan 26, 2022 at 7:10 PM Mika Westerberg
<mika.westerberg@xxxxxxxxxxxxxxx> wrote:
>
> Hi,
>
> On Wed, Jan 26, 2022 at 03:18:52PM +0800, Kai-Heng Feng wrote:
> > Since TLP and DLLP transmission is disabled for a Link in L2/L3 Ready,
> > L2 and L3, and DPC depends on AER, so also disable DPC here.
>
> Here too I think it is good to mention that the DPC "service" never
> implemented the PM hooks in the first place
Will amend the commit message a bit.
>
> > Signed-off-by: Kai-Heng Feng <kai.heng.feng@xxxxxxxxxxxxx>
>
> One minor comment below, but other than that looks good,
>
> Reviewed-by: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx>
>
> > ---
> > drivers/pci/pcie/dpc.c | 61 +++++++++++++++++++++++++++++++-----------
> > 1 file changed, 45 insertions(+), 16 deletions(-)
> >
> > diff --git a/drivers/pci/pcie/dpc.c b/drivers/pci/pcie/dpc.c
> > index 3e9afee02e8d1..9585c10b7c577 100644
> > --- a/drivers/pci/pcie/dpc.c
> > +++ b/drivers/pci/pcie/dpc.c
> > @@ -343,13 +343,34 @@ void pci_dpc_init(struct pci_dev *pdev)
> > }
> > }
> >
> > +static void dpc_enable(struct pcie_device *dev)
> > +{
> > + struct pci_dev *pdev = dev->port;
> > + u16 ctl;
> > +
> > + pci_read_config_word(pdev, pdev->dpc_cap + PCI_EXP_DPC_CTL, &ctl);
> > +
>
> Drop the empty line here.
OK, will do.
Kai-Heng
>
> > + ctl = (ctl & 0xfff4) | PCI_EXP_DPC_CTL_EN_FATAL | PCI_EXP_DPC_CTL_INT_EN;
> > + pci_write_config_word(pdev, pdev->dpc_cap + PCI_EXP_DPC_CTL, ctl);
> > +}
> > +
> > +static void dpc_disable(struct pcie_device *dev)
> > +{
> > + struct pci_dev *pdev = dev->port;
> > + u16 ctl;
> > +
> > + pci_read_config_word(pdev, pdev->dpc_cap + PCI_EXP_DPC_CTL, &ctl);
> > + ctl &= ~(PCI_EXP_DPC_CTL_EN_FATAL | PCI_EXP_DPC_CTL_INT_EN);
> > + pci_write_config_word(pdev, pdev->dpc_cap + PCI_EXP_DPC_CTL, ctl);
> > +}
