drm/i915/pm: drop get_fifo_size vfunc.

The i845_update_wm code was always calling the i845 variant,
and the i9xx_update_wm had only a choice between i830 and i9xx
paths, hardly worth the vfunc overhead.
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/07523b1e46cd10adb2991ed4d2619b542a48c1ce.1632869550.git.jani.nikula@intel.com

drivers/gpu/drm/i915/i915_drv.h

@@ -330,8 +330,6 @@ struct drm_i915_display_funcs {
 			  const struct intel_cdclk_config *cdclk_config,
 			  enum pipe pipe);
 	int (*bw_calc_min_cdclk)(struct intel_atomic_state *state);
-	int (*get_fifo_size)(struct drm_i915_private *dev_priv,
-			     enum i9xx_plane_id i9xx_plane);
 	int (*compute_pipe_wm)(struct intel_atomic_state *state,
 			       struct intel_crtc *crtc);
 	int (*compute_intermediate_wm)(struct intel_atomic_state *state,

drivers/gpu/drm/i915/intel_pm.c

@@ -2342,7 +2342,10 @@ static void i9xx_update_wm(struct intel_crtc *unused_crtc)
 	else
 		wm_info = &i830_a_wm_info;
 
-	fifo_size = dev_priv->display.get_fifo_size(dev_priv, PLANE_A);
+	if (DISPLAY_VER(dev_priv) == 2)
+		fifo_size = i830_get_fifo_size(dev_priv, PLANE_A);
+	else
+		fifo_size = i9xx_get_fifo_size(dev_priv, PLANE_A);
 	crtc = intel_get_crtc_for_plane(dev_priv, PLANE_A);
 	if (intel_crtc_active(crtc)) {
 		const struct drm_display_mode *pipe_mode =
@@ -2369,7 +2372,10 @@ static void i9xx_update_wm(struct intel_crtc *unused_crtc)
 	if (DISPLAY_VER(dev_priv) == 2)
 		wm_info = &i830_bc_wm_info;
 
-	fifo_size = dev_priv->display.get_fifo_size(dev_priv, PLANE_B);
+	if (DISPLAY_VER(dev_priv) == 2)
+		fifo_size = i830_get_fifo_size(dev_priv, PLANE_B);
+	else
+		fifo_size = i9xx_get_fifo_size(dev_priv, PLANE_B);
 	crtc = intel_get_crtc_for_plane(dev_priv, PLANE_B);
 	if (intel_crtc_active(crtc)) {
 		const struct drm_display_mode *pipe_mode =
@@ -2485,7 +2491,7 @@ static void i845_update_wm(struct intel_crtc *unused_crtc)
 	pipe_mode = &crtc->config->hw.pipe_mode;
 	planea_wm = intel_calculate_wm(pipe_mode->crtc_clock,
 				       &i845_wm_info,
-				       dev_priv->display.get_fifo_size(dev_priv, PLANE_A),
+				       i845_get_fifo_size(dev_priv, PLANE_A),
 				       4, pessimal_latency_ns);
 	fwater_lo = intel_uncore_read(&dev_priv->uncore, FW_BLC) & ~0xfff;
 	fwater_lo |= (3<<8) | planea_wm;
@@ -8052,15 +8058,11 @@ void intel_init_pm(struct drm_i915_private *dev_priv)
 		dev_priv->display.update_wm = i965_update_wm;
 	} else if (DISPLAY_VER(dev_priv) == 3) {
 		dev_priv->display.update_wm = i9xx_update_wm;
-		dev_priv->display.get_fifo_size = i9xx_get_fifo_size;
 	} else if (DISPLAY_VER(dev_priv) == 2) {
-		if (INTEL_NUM_PIPES(dev_priv) == 1) {
+		if (INTEL_NUM_PIPES(dev_priv) == 1)
 			dev_priv->display.update_wm = i845_update_wm;
-			dev_priv->display.get_fifo_size = i845_get_fifo_size;
-		} else {
+		else
 			dev_priv->display.update_wm = i9xx_update_wm;
-			dev_priv->display.get_fifo_size = i830_get_fifo_size;
-		}
 	} else {
 		drm_err(&dev_priv->drm,
 			"unexpected fall-through in %s\n", __func__);