drm/i915: Use plane->get_hw_state() for initial plane fb readout

Since we now have a ->get_hw_state() method for planes, let's use
that during the initial plane fb readout.

v2: s/plane/i9xx_plane/ etc. (James)

Cc: James Ausmus <james.ausmus@intel.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Suggested-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: James Ausmus <james.ausmus@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171117191917.11506-10-ville.syrjala@linux.intel.com
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 62cc2a6..ed58311 100644 (file)
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -7413,8 +7413,7 @@ i9xx_get_initial_plane_config(struct intel_crtc *crtc,
        struct drm_framebuffer *fb;
        struct intel_framebuffer *intel_fb;
 
-       val = I915_READ(DSPCNTR(i9xx_plane));
-       if (!(val & DISPLAY_PLANE_ENABLE))
+       if (!plane->get_hw_state(plane))
                return;
 
        intel_fb = kzalloc(sizeof(*intel_fb), GFP_KERNEL);
@@ -7427,6 +7426,8 @@ i9xx_get_initial_plane_config(struct intel_crtc *crtc,
 
        fb->dev = dev;
 
+       val = I915_READ(DSPCNTR(i9xx_plane));
+
        if (INTEL_GEN(dev_priv) >= 4) {
                if (val & DISPPLANE_TILED) {
                        plane_config->tiling = I915_TILING_X;
@@ -8442,6 +8443,9 @@ skylake_get_initial_plane_config(struct intel_crtc *crtc,
        struct drm_framebuffer *fb;
        struct intel_framebuffer *intel_fb;
 
+       if (!plane->get_hw_state(plane))
+               return;
+
        intel_fb = kzalloc(sizeof(*intel_fb), GFP_KERNEL);
        if (!intel_fb) {
                DRM_DEBUG_KMS("failed to alloc fb\n");
@@ -8453,8 +8457,6 @@ skylake_get_initial_plane_config(struct intel_crtc *crtc,
        fb->dev = dev;
 
        val = I915_READ(PLANE_CTL(pipe, plane_id));
-       if (!(val & PLANE_CTL_ENABLE))
-               goto error;
 
        pixel_format = val & PLANE_CTL_FORMAT_MASK;