1 files changed, 23 insertions, 6 deletions

diff --git a/drivers/gpu/drm/radeon/radeon_irq_kms.c b/drivers/gpu/drm/radeon/radeon_irq_kms.c
index 93da85515cd2..91de37a0fde2 100644
--- a/drivers/gpu/drm/radeon/radeon_irq_kms.c
+++ b/drivers/gpu/drm/radeon/radeon_irq_kms.c
@@ -108,6 +108,27 @@ void radeon_driver_irq_uninstall_kms(struct drm_device *dev)
         radeon_irq_set(rdev);
 }
 
+static bool radeon_msi_ok(struct radeon_device *rdev)
+{
+        /* RV370/RV380 was first asic with MSI support */
+        if (rdev->family < CHIP_RV380)
+                return false;
+
+        /* MSIs don't work on AGP */
+        if (rdev->flags & RADEON_IS_AGP)
+                return false;
+
+        if (rdev->flags & RADEON_IS_IGP) {
+                /* APUs work fine with MSIs */
+                if (rdev->family >= CHIP_PALM)
+                        return true;
+                /* lots of IGPs have problems with MSIs */
+                return false;
+        }
+
+        return true;
+}
+
 int radeon_irq_kms_init(struct radeon_device *rdev)
 {
         int i;
@@ -124,12 +145,8 @@ int radeon_irq_kms_init(struct radeon_device *rdev)
         }
         /* enable msi */
         rdev->msi_enabled = 0;
-        /* MSIs don't seem to work reliably on all IGP
-         * chips.  Disable MSI on them for now.
-         */
-        if ((rdev->family >= CHIP_RV380) &&
-            ((!(rdev->flags & RADEON_IS_IGP)) || (rdev->family >= CHIP_PALM)) &&
-            (!(rdev->flags & RADEON_IS_AGP))) {
+
+        if (radeon_msi_ok(rdev)) {
                 int ret = pci_enable_msi(rdev->pdev);
                 if (!ret) {
                         rdev->msi_enabled = 1;