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path: root/drivers/gpu/drm/radeon/radeon_irq_kms.c
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Diffstat (limited to 'drivers/gpu/drm/radeon/radeon_irq_kms.c')
-rw-r--r--drivers/gpu/drm/radeon/radeon_irq_kms.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/gpu/drm/radeon/radeon_irq_kms.c b/drivers/gpu/drm/radeon/radeon_irq_kms.c
index 7784911d78ef..00fc59762e0d 100644
--- a/drivers/gpu/drm/radeon/radeon_irq_kms.c
+++ b/drivers/gpu/drm/radeon/radeon_irq_kms.c
@@ -185,6 +185,16 @@ static bool radeon_msi_ok(struct radeon_device *rdev)
if (rdev->flags & RADEON_IS_AGP)
return false;
+ /*
+ * Older chips have a HW limitation, they can only generate 40 bits
+ * of address for "64-bit" MSIs which breaks on some platforms, notably
+ * IBM POWER servers, so we limit them
+ */
+ if (rdev->family < CHIP_BONAIRE) {
+ dev_info(rdev->dev, "radeon: MSI limited to 32-bit\n");
+ rdev->pdev->no_64bit_msi = 1;
+ }
+
/* force MSI on */
if (radeon_msi == 1)
return true;