linux-kernel - [PATCH RESEND 1/1] PCI: Add ATS-disable quirk for AMD Radeon R7 GPUs

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Message-Id: <20190408103725.30426-2-nickel@altlinux.org>
Date:   Mon,  8 Apr 2019 13:37:25 +0300
From:   Nikolai Kostrigin <nickel@...linux.org>
To:     linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     jroedel@...e.de, Nikolai Kostrigin <nickel@...linux.org>
Subject: [PATCH RESEND 1/1] PCI: Add ATS-disable quirk for AMD Radeon R7 GPUs

ATS is broken on this hardware (at least for Stoney Ridge
based laptop) and causes IOMMU stalls and
system failure. Disable ATS on these devices to make them
usable again with IOMMU enabled
Thanks to Joerg Roedel <jroedel@...e.de> for help.

https://bugzilla.kernel.org/show_bug.cgi?id=194521

Signed-off-by: Nikolai Kostrigin <nickel@...linux.org>
---
 drivers/pci/quirks.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index 4700d24e5d55..abb2532e16bf 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -4876,6 +4876,7 @@ static void quirk_no_ats(struct pci_dev *pdev)
 
 /* AMD Stoney platform GPU */
 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_ATI, 0x98e4, quirk_no_ats);
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_ATI, 0x6900, quirk_no_ats);
 #endif /* CONFIG_PCI_ATS */
 
 /* Freescale PCIe doesn't support MSI in RC mode */
-- 
2.21.0