* [PATCH] PCI: Add ACS quirk for Pericom PI7C9X2G608 switches [12d8:2608]
@ 2026-07-20 21:57 Tim Harvey
2026-07-21 16:28 ` Bjorn Helgaas
0 siblings, 1 reply; 2+ messages in thread
From: Tim Harvey @ 2026-07-20 21:57 UTC (permalink / raw)
To: Bjorn Helgaas; +Cc: linux-pci, linux-kernel, Tim Harvey, stable
The Pericom PI7C9X2G608 6-port Gen2 PCIe switch is also affected by
the PI7C9X2G errata per the errata document:
E2: ACS P2P Request Redirect Is Not Functional
Apply the same quirk to this PCI ID as well to apply the workaround
required if using ACS.
Fixes: acd61ffb2f16 ("PCI: Add ACS quirk for Pericom PI7C9X2G switches")
Cc: stable@vger.kernel.org
Signed-off-by: Tim Harvey <tharvey@gateworks.com>
---
drivers/pci/quirks.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index b09f27f7846f..27f7d56c9ac3 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -6263,6 +6263,10 @@ DECLARE_PCI_FIXUP_ENABLE(PCI_VENDOR_ID_PERICOM, 0xb404,
pci_fixup_pericom_acs_store_forward);
DECLARE_PCI_FIXUP_RESUME(PCI_VENDOR_ID_PERICOM, 0xb404,
pci_fixup_pericom_acs_store_forward);
+DECLARE_PCI_FIXUP_ENABLE(PCI_VENDOR_ID_PERICOM, 0x2608,
+ pci_fixup_pericom_acs_store_forward);
+DECLARE_PCI_FIXUP_RESUME(PCI_VENDOR_ID_PERICOM, 0x2608,
+ pci_fixup_pericom_acs_store_forward);
static void nvidia_ion_ahci_fixup(struct pci_dev *pdev)
{
--
2.34.1
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [PATCH] PCI: Add ACS quirk for Pericom PI7C9X2G608 switches [12d8:2608]
2026-07-20 21:57 [PATCH] PCI: Add ACS quirk for Pericom PI7C9X2G608 switches [12d8:2608] Tim Harvey
@ 2026-07-21 16:28 ` Bjorn Helgaas
0 siblings, 0 replies; 2+ messages in thread
From: Bjorn Helgaas @ 2026-07-21 16:28 UTC (permalink / raw)
To: Tim Harvey, Nathan Rossi, Nathan Rossi
Cc: Bjorn Helgaas, linux-pci, linux-kernel, stable
[+to Nathan]
On Mon, Jul 20, 2026 at 02:57:18PM -0700, Tim Harvey wrote:
> The Pericom PI7C9X2G608 6-port Gen2 PCIe switch is also affected by
> the PI7C9X2G errata per the errata document:
> E2: ACS P2P Request Redirect Is Not Functional
>
> Apply the same quirk to this PCI ID as well to apply the workaround
> required if using ACS.
>
> Fixes: acd61ffb2f16 ("PCI: Add ACS quirk for Pericom PI7C9X2G switches")
> Cc: stable@vger.kernel.org
> Signed-off-by: Tim Harvey <tharvey@gateworks.com>
Applied to pci/virtualization for v7.3, thanks!
Note that Sashiko found what looks like a legit pre-existing issue
with acd61ffb2f16 ("PCI: Add ACS quirk for Pericom PI7C9X2G
switches"):
https://lore.kernel.org/all/20260720223203.A30841F000E9@smtp.kernel.org
> ---
> drivers/pci/quirks.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
> index b09f27f7846f..27f7d56c9ac3 100644
> --- a/drivers/pci/quirks.c
> +++ b/drivers/pci/quirks.c
> @@ -6263,6 +6263,10 @@ DECLARE_PCI_FIXUP_ENABLE(PCI_VENDOR_ID_PERICOM, 0xb404,
> pci_fixup_pericom_acs_store_forward);
> DECLARE_PCI_FIXUP_RESUME(PCI_VENDOR_ID_PERICOM, 0xb404,
> pci_fixup_pericom_acs_store_forward);
> +DECLARE_PCI_FIXUP_ENABLE(PCI_VENDOR_ID_PERICOM, 0x2608,
> + pci_fixup_pericom_acs_store_forward);
> +DECLARE_PCI_FIXUP_RESUME(PCI_VENDOR_ID_PERICOM, 0x2608,
> + pci_fixup_pericom_acs_store_forward);
>
> static void nvidia_ion_ahci_fixup(struct pci_dev *pdev)
> {
> --
> 2.34.1
>
^ permalink raw reply [flat|nested] 2+ messages in thread
end of thread, other threads:[~2026-07-21 16:28 UTC | newest]
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