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, 16 insertions, 1 deletions

diff --git a/drivers/gpu/drm/radeon/r100.c b/drivers/gpu/drm/radeon/r100.c
index ed5e983d21e9..b438b520ee7f 100644
--- a/drivers/gpu/drm/radeon/r100.c
+++ b/drivers/gpu/drm/radeon/r100.c
@@ -186,7 +186,7 @@ static inline uint32_t r100_irq_ack(struct radeon_device *rdev)
 
 int r100_irq_process(struct radeon_device *rdev)
 {
-        uint32_t status;
+        uint32_t status, msi_rearm;
 
         status = r100_irq_ack(rdev);
         if (!status) {
@@ -209,6 +209,21 @@ int r100_irq_process(struct radeon_device *rdev)
                 }
                 status = r100_irq_ack(rdev);
         }
+        if (rdev->msi_enabled) {
+                switch (rdev->family) {
+                case CHIP_RS400:
+                case CHIP_RS480:
+                        msi_rearm = RREG32(RADEON_AIC_CNTL) & ~RS400_MSI_REARM;
+                        WREG32(RADEON_AIC_CNTL, msi_rearm);
+                        WREG32(RADEON_AIC_CNTL, msi_rearm | RS400_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;
 }