drm/radeon/kms: add support for msi

Try to enable msi on chips that support it.

Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 17 insertions, 1 deletions

diff --git a/drivers/gpu/drm/radeon/rs600.c b/drivers/gpu/drm/radeon/rs600.c
index 10dfa78762da..942754c39be9 100644
--- a/drivers/gpu/drm/radeon/rs600.c
+++ b/drivers/gpu/drm/radeon/rs600.c
@@ -242,7 +242,7 @@ void rs600_irq_disable(struct radeon_device *rdev)
 
 int rs600_irq_process(struct radeon_device *rdev)
 {
-        uint32_t status;
+        uint32_t status, msi_rearm;
         uint32_t r500_disp_int;
 
         status = rs600_irq_ack(rdev, &r500_disp_int);
@@ -260,6 +260,22 @@ int rs600_irq_process(struct radeon_device *rdev)
                         drm_handle_vblank(rdev->ddev, 1);
                 status = rs600_irq_ack(rdev, &r500_disp_int);
         }
+        if (rdev->msi_enabled) {
+                switch (rdev->family) {
+                case CHIP_RS600:
+                case CHIP_RS690:
+                case CHIP_RS740:
+                        msi_rearm = RREG32(RADEON_BUS_CNTL) & ~RS600_MSI_REARM;
+                        WREG32(RADEON_BUS_CNTL, msi_rearm);
+                        WREG32(RADEON_BUS_CNTL, msi_rearm | RS600_MSI_REARM);
+                        break;
+                default:
+                        msi_rearm = RREG32(RADEON_MSI_REARM_EN) & ~RV370_MSI_REARM_EN;
+                        WREG32(RADEON_MSI_REARM_EN, msi_rearm);
+                        WREG32(RADEON_MSI_REARM_EN, msi_rearm | RV370_MSI_REARM_EN);
+                        break;
+                }
+        }
         return IRQ_HANDLED;
 }