[ 67/68] drm/radeon: disable MSI on RV515

[Greg KH]

3.2-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Dave Airlie <airlied@xxxxxxxxxx>

commit 16a5e32b83fd946312b9b13590c75d20c95c5202 upstream.

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@xxxxxxx>
Signed-off-by: Dave Airlie <airlied@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/gpu/drm/radeon/radeon_irq_kms.c |    6 ++++++
 1 file changed, 6 insertions(+)

--- a/drivers/gpu/drm/radeon/radeon_irq_kms.c
+++ b/drivers/gpu/drm/radeon/radeon_irq_kms.c
@@ -143,6 +143,12 @@ static bool radeon_msi_ok(struct radeon_
 	    (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)


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