drm: pin new and unpin old buffer when setting a mode.

This removes the requirement for user space to pin a buffer before
setting a mode that is backed by the pixels from that buffer.

Signed-off-by: Kristian Høgsberg <krh@redhat.com>
Signed-off-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Dave Airlie <airlied@linux.ie>

1 files changed, 36 insertions, 8 deletions

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 6e8b9ab83e97..e5c1c80d1f90 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -344,7 +344,8 @@ intel_wait_for_vblank(struct drm_device *dev)
 }
 
 static void
-intel_pipe_set_base(struct drm_crtc *crtc, int x, int y)
+intel_pipe_set_base(struct drm_crtc *crtc, int x, int y,
+                    struct drm_framebuffer *old_fb)
 {
         struct drm_device *dev = crtc->dev;
         struct drm_i915_private *dev_priv = dev->dev_private;
@@ -359,7 +360,7 @@ intel_pipe_set_base(struct drm_crtc *crtc, int x, int y)
         int dspsurf = (pipe == 0 ? DSPASURF : DSPBSURF);
         int dspstride = (pipe == 0) ? DSPASTRIDE : DSPBSTRIDE;
         int dspcntr_reg = (pipe == 0) ? DSPACNTR : DSPBCNTR;
-        u32 dspcntr;
+        u32 dspcntr, alignment;
 
         /* no fb bound */
         if (!crtc->fb) {
@@ -368,10 +369,32 @@ intel_pipe_set_base(struct drm_crtc *crtc, int x, int y)
         }
 
         intel_fb = to_intel_framebuffer(crtc->fb);
-
         obj = intel_fb->obj;
         obj_priv = obj->driver_private;
 
+        switch (obj_priv->tiling_mode) {
+        case I915_TILING_NONE:
+                alignment = 64 * 1024;
+                break;
+        case I915_TILING_X:
+                if (IS_I9XX(dev))
+                        alignment = 1024 * 1024;
+                else
+                        alignment = 512 * 1024;
+                break;
+        case I915_TILING_Y:
+                /* FIXME: Is this true? */
+                DRM_ERROR("Y tiled not allowed for scan out buffers\n");
+                return;
+        default:
+                BUG();
+        }
+
+        if (i915_gem_object_pin(intel_fb->obj, alignment))
+                return;
+
+        i915_gem_object_set_to_gtt_domain(intel_fb->obj, 1);
+
         Start = obj_priv->gtt_offset;
         Offset = y * crtc->fb->pitch + x * (crtc->fb->bits_per_pixel / 8);
 
@@ -409,6 +432,12 @@ intel_pipe_set_base(struct drm_crtc *crtc, int x, int y)
                 I915_READ(dspbase);
         }
 
+        intel_wait_for_vblank(dev);
+
+        if (old_fb) {
+                intel_fb = to_intel_framebuffer(old_fb);
+                i915_gem_object_unpin(intel_fb->obj);
+        }
 
         if (!dev->primary->master)
                 return;
@@ -680,7 +709,8 @@ static int intel_panel_fitter_pipe (struct drm_device *dev)
 static void intel_crtc_mode_set(struct drm_crtc *crtc,
                                 struct drm_display_mode *mode,
                                 struct drm_display_mode *adjusted_mode,
-                                int x, int y)
+                                int x, int y,
+                                struct drm_framebuffer *old_fb)
 {
         struct drm_device *dev = crtc->dev;
         struct drm_i915_private *dev_priv = dev->dev_private;
@@ -915,9 +945,7 @@ static void intel_crtc_mode_set(struct drm_crtc *crtc,
         I915_WRITE(dspcntr_reg, dspcntr);
 
         /* Flush the plane changes */
-        intel_pipe_set_base(crtc, x, y);
-
-        intel_wait_for_vblank(dev);
+        intel_pipe_set_base(crtc, x, y, old_fb);
 
         drm_vblank_post_modeset(dev, pipe);
 }
@@ -1153,7 +1181,7 @@ struct drm_crtc *intel_get_load_detect_pipe(struct intel_output *intel_output,
         if (!crtc->enabled) {
                 if (!mode)
                         mode = &load_detect_mode;
-                drm_crtc_helper_set_mode(crtc, mode, 0, 0);
+                drm_crtc_helper_set_mode(crtc, mode, 0, 0, crtc->fb);
         } else {
                 if (intel_crtc->dpms_mode != DRM_MODE_DPMS_ON) {
                         crtc_funcs = crtc->helper_private;