drm/radeon: disable MSI on RV515

My rv515 card is very flaky with msi enabled. Every so often it loses a rearm
and never comes back, manually banging the rearm brings it back.

Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Signed-off-by: Dave Airlie <airlied@redhat.com>

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 66d5fe1c8174..65060b77c805 100644
--- a/drivers/gpu/drm/radeon/radeon_irq_kms.c
+++ b/drivers/gpu/drm/radeon/radeon_irq_kms.c
@@ -147,6 +147,12 @@ static bool radeon_msi_ok(struct radeon_device *rdev)
             (rdev->pdev->subsystem_device == 0x01fd))
                 return true;
 
+        /* RV515 seems to have MSI issues where it loses
+         * MSI rearms occasionally. This leads to lockups and freezes.
+         * disable it by default.
+         */
+        if (rdev->family == CHIP_RV515)
+                return false;
         if (rdev->flags & RADEON_IS_IGP) {
                 /* APUs work fine with MSIs */
                 if (rdev->family >= CHIP_PALM)