On Wed, Mar 29, 2023 at 07:58:45PM +0800, Wu Zongyong wrote:
> Secondary bus reset will fail if NVIDIA T4 card is direct attached to a
> root port.
Blank line between paragraphs. Rewrap to fill 75 columns if it's a
single paragraph.
Is this only a problem when direct attached to a Root Port? Why would
that be? If it's *not* related to being directly under a Root Port,
don't mention that at all.
> So avoid to do bus reset, pci_parent_bus_reset() works nomarlly.
>
> Maybe NVIDIA guys can do some detailed explanation abount the SBR
> behaviour of GPUs.
This is a follow-on to 4c207e7121fa ("PCI: Mark some NVIDIA GPUs to
avoid bus reset"), so probably should have a Fixes: tag so it goes
whereever that commit goes.
Also copy the subject line from 4c207e7121fa, e.g.,
PCI: Mark NVIDIA T4 GPUs to avoid bus reset
Are there any problem reports or bugzilla issues you can include a URL
to?
> Signed-off-by: Wu Zongyong <wuzongyong@xxxxxxxxxxxxxxxxx>
> ---
> drivers/pci/quirks.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
> index 44cab813bf95..be86b93b9e38 100644
> --- a/drivers/pci/quirks.c
> +++ b/drivers/pci/quirks.c
> @@ -3618,7 +3618,7 @@ static void quirk_no_bus_reset(struct pci_dev *dev)
> */
> static void quirk_nvidia_no_bus_reset(struct pci_dev *dev)
> {
> - if ((dev->device & 0xffc0) == 0x2340)
> + if ((dev->device & 0xffc0) == 0x2340 || dev->device == 0x1eb8)
> quirk_no_bus_reset(dev);
> }
> DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NVIDIA, PCI_ANY_ID,
> --
> 2.34.3
>
