drm/i915: don't store the reg value for HWS_PGA

It is trivially computable from the real physical address so no need to
store both.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

2 files changed, 13 insertions, 7 deletions

diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
index 8924b4bc7369..72730377a01b 100644
--- a/drivers/gpu/drm/i915/i915_dma.c
+++ b/drivers/gpu/drm/i915/i915_dma.c
@@ -43,6 +43,17 @@
 #include <linux/slab.h>
 #include <acpi/video.h>
 
+static void i915_write_hws_pga(struct drm_device *dev)
+{
+        drm_i915_private_t *dev_priv = dev->dev_private;
+        u32 addr;
+
+        addr = dev_priv->status_page_dmah->busaddr;
+        if (INTEL_INFO(dev)->gen >= 4)
+                addr |= (dev_priv->status_page_dmah->busaddr >> 28) & 0xf0;
+        I915_WRITE(HWS_PGA, addr);
+}
+
 /**
  * Sets up the hardware status page for devices that need a physical address
  * in the register.
@@ -62,15 +73,11 @@ static int i915_init_phys_hws(struct drm_device *dev)
         }
         ring->status_page.page_addr =
                 (void __force __iomem *)dev_priv->status_page_dmah->vaddr;
-        dev_priv->dma_status_page = dev_priv->status_page_dmah->busaddr;
 
         memset_io(ring->status_page.page_addr, 0, PAGE_SIZE);
 
-        if (INTEL_INFO(dev)->gen >= 4)
-                dev_priv->dma_status_page |= (dev_priv->dma_status_page >> 28) &
-                                             0xf0;
+        i915_write_hws_pga(dev);
 
-        I915_WRITE(HWS_PGA, dev_priv->dma_status_page);
         DRM_DEBUG_DRIVER("Enabled hardware status page\n");
         return 0;
 }
@@ -217,7 +224,7 @@ static int i915_dma_resume(struct drm_device * dev)
         if (ring->status_page.gfx_addr != 0)
                 intel_ring_setup_status_page(ring);
         else
-                I915_WRITE(HWS_PGA, dev_priv->dma_status_page);
+                i915_write_hws_pga(dev);
 
         DRM_DEBUG_DRIVER("Enabled hardware status page\n");
 
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 7a4725c240d3..fd41b86864e9 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -274,7 +274,6 @@ typedef struct drm_i915_private {
         uint32_t next_seqno;
 
         drm_dma_handle_t *status_page_dmah;
-        dma_addr_t dma_status_page;
         uint32_t counter;
         drm_local_map_t hws_map;
         struct drm_i915_gem_object *pwrctx;