gpu/radeon: Set flag to indicate broken 64-bit MSI

[platform/adaptation/renesas_rcar/renesas_kernel.git] / drivers / gpu / drm / radeon / radeon_irq_kms.c

diff --git a/drivers/gpu/drm/radeon/radeon_irq_kms.c b/drivers/gpu/drm/radeon/radeon_irq_kms.c
index ec6240b..b3f0293 100644 (file)
--- a/drivers/gpu/drm/radeon/radeon_irq_kms.c
+++ b/drivers/gpu/drm/radeon/radeon_irq_kms.c
@@ -39,13 +39,13 @@
 /**
  * radeon_driver_irq_handler_kms - irq handler for KMS
  *
- * @DRM_IRQ_ARGS: args
+ * @int irq, void *arg: args
  *
  * This is the irq handler for the radeon KMS driver (all asics).
  * radeon_irq_process is a macro that points to the per-asic
  * irq handler callback.
  */
-irqreturn_t radeon_driver_irq_handler_kms(DRM_IRQ_ARGS)
+irqreturn_t radeon_driver_irq_handler_kms(int irq, void *arg)
 {
        struct drm_device *dev = (struct drm_device *) arg;
        struct radeon_device *rdev = dev->dev_private;
@@ -202,6 +202,16 @@ 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;