drm/radeon/kms: Add an MSI quirk for Dell RS690

Interrupts only work with MSIs.
https://bugs.freedesktop.org/show_bug.cgi?id=37679Reported-by: Dmitry Podgorny <pasis.uax@gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Signed-off-by: Dave Airlie <airlied@redhat.com>

drivers/gpu/drm/radeon/radeon_irq_kms.c

@@ -135,6 +135,12 @@ static bool radeon_msi_ok(struct radeon_device *rdev)
 	    (rdev->pdev->subsystem_device == 0x30c2))
 		return true;
 
+	/* Dell RS690 only seems to work with MSIs. */
+	if ((rdev->pdev->device == 0x791f) &&
+	    (rdev->pdev->subsystem_vendor == 0x1028) &&
+	    (rdev->pdev->subsystem_device == 0x01fc))
+		return true;
+
 	/* Dell RS690 only seems to work with MSIs. */
 	if ((rdev->pdev->device == 0x791f) &&
 	    (rdev->pdev->subsystem_vendor == 0x1028) &&