[PATCH 1/4] drm/radeon/kms: split MSI check into a separate function

[alexdeuc...@gmail.com]

From: Alex Deucher <alexander.deuc...@amd.com>

This makes it easier to add quirks for certain systems.

Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
Cc: stable at kernel.org
---
 drivers/gpu/drm/radeon/radeon_irq_kms.c |   29 +++++++++++++++++++++++------
 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 9ec830c..f0e660b 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;
-- 
1.7.3.4