Re: [PATCH v4] PCI: Add quirk for preventing bus reset on TI C667X

From: Kishon Vijay Abraham I
Date: Mon Apr 19 2021 - 08:44:55 EST




On 15/03/21 3:56 pm, Antti Järvinen wrote:
> Some TI KeyStone C667X devices do not support bus/hot reset. Its PCIESS
> automatically disables LTSSM when secondary bus reset is received and
> device stops working. Prevent bus reset by adding quirk_no_bus_reset to
> the device. With this change device can be assigned to VMs with VFIO,
> but it will leak state between VMs.
>
> Reference: https://e2e.ti.com/support/processors/f/791/t/954382
> Signed-off-by: Antti Järvinen <antti.jarvinen@xxxxxxxxx>

Reviewed-by: Kishon Vijay Abraham I <kishon@xxxxxx>
> ---
> drivers/pci/quirks.c | 10 ++++++++++
> 1 file changed, 10 insertions(+)
>
> diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
> index 653660e3ba9e..d9201ad1ca39 100644
> --- a/drivers/pci/quirks.c
> +++ b/drivers/pci/quirks.c
> @@ -3578,6 +3578,16 @@ DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_ATHEROS, 0x0034, quirk_no_bus_reset);
> */
> DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_CAVIUM, 0xa100, quirk_no_bus_reset);
>
> +/*
> + * Some TI keystone C667X devices do no support bus/hot reset.
> + * Its PCIESS automatically disables LTSSM when secondary bus reset is
> + * received and device stops working. Prevent bus reset by adding
> + * quirk_no_bus_reset to the device. With this change device can be
> + * assigned to VMs with VFIO, but it will leak state between VMs.
> + * Reference https://e2e.ti.com/support/processors/f/791/t/954382
> + */
> +DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_TI, 0xb005, quirk_no_bus_reset);
> +
> static void quirk_no_pm_reset(struct pci_dev *dev)
> {
> /*
>