drm/i915: Clean up skl+ PLANE_POS vs. scaler handling

On skl+ the scaler (when enabled) will take care of the plane output
position. Make the code less ugly by just setting crtc_x/y to 0
when the scaler is enabled.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20181101150605.18235-6-ville.syrjala@linux.intel.com
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

diff --git a/drivers/gpu/drm/i915/intel_sprite.c b/drivers/gpu/drm/i915/intel_sprite.c
index 6d9f321..facf7ca 100644 (file)
--- a/drivers/gpu/drm/i915/intel_sprite.c
+++ b/drivers/gpu/drm/i915/intel_sprite.c
@@ -492,6 +492,12 @@ skl_program_plane(struct intel_plane *plane,
        if (alpha < 0xff)
                keymsk |= PLANE_KEYMSK_ALPHA_ENABLE;
 
+       /* The scaler will handle the output position */
+       if (plane_state->scaler_id >= 0) {
+               crtc_x = 0;
+               crtc_y = 0;
+       }
+
        spin_lock_irqsave(&dev_priv->uncore.lock, irqflags);
 
        if (INTEL_GEN(dev_priv) >= 10 || IS_GEMINILAKE(dev_priv))
@@ -537,14 +543,10 @@ skl_program_plane(struct intel_plane *plane,
                I915_WRITE_FW(PLANE_CUS_CTL(pipe, plane_id), cus_ctl);
        }
 
-       if (plane_state->scaler_id >= 0) {
-               if (!slave)
-                       skl_program_scaler(plane, crtc_state, plane_state);
+       if (!slave && plane_state->scaler_id >= 0)
+               skl_program_scaler(plane, crtc_state, plane_state);
 
-               I915_WRITE_FW(PLANE_POS(pipe, plane_id), 0);
-       } else {
-               I915_WRITE_FW(PLANE_POS(pipe, plane_id), (crtc_y << 16) | crtc_x);
-       }
+       I915_WRITE_FW(PLANE_POS(pipe, plane_id), (crtc_y << 16) | crtc_x);
 
        I915_WRITE_FW(PLANE_CTL(pipe, plane_id), plane_ctl);
        I915_WRITE_FW(PLANE_SURF(pipe, plane_id),