[PATCH 3/4] drm/radeon/kms: Add MSI quirk for Dell RS690

[alexdeucher at gmail.com]

From: Alex Deucher <alexander.deucher at amd.com>

Some Dell laptops only seem to work with MSIs.  This
looks like a platform/bios bug.

Fixes:
https://bugs.freedesktop.org/show_bug.cgi?id=37679

Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
Cc: stable at kernel.org
---
 drivers/gpu/drm/radeon/radeon_irq_kms.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/drivers/gpu/drm/radeon/radeon_irq_kms.c b/drivers/gpu/drm/radeon/radeon_irq_kms.c
index b0ed0e1..a68c6266 100644
--- a/drivers/gpu/drm/radeon/radeon_irq_kms.c
+++ b/drivers/gpu/drm/radeon/radeon_irq_kms.c
@@ -125,6 +125,12 @@ 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 == 0x01fd))
+		return true;
+
 	if (rdev->flags & RADEON_IS_IGP) {
 		/* APUs work fine with MSIs */
 		if (rdev->family >= CHIP_PALM)
-- 
1.7.3.4