drm/i915/wm: add .get_hw_state to watermark funcs

Get rid of the if ladder in intel_modeset_setup_hw_state() and hide a
number of functions by adding a .get_hw_state() hook to watermark
functions. At least for now, combine the platform specific sanitization
to the hw state readouts on the relevant platforms instead of adding a
separate hook for that.

There's a functional change on PCH split platforms: If i9xx_wm_init()
fails to read plane latency and chooses the nop functions,
ilk_wm_get_hw_state() won't get called for readout. Add the
ilk_init_lp_watermarks() call on that path which now won't be called in
.get_hw_state(), as it looks like the only thing that could make a
difference.

v2:
- Add missing static (kernel test robot)

Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/6da32831e40606cc8b90491b83196917f2ce36ab.1676317696.git.jani.nikula@intel.com

drivers/gpu/drm/i915/display/i9xx_wm.c

@@ -3487,7 +3487,7 @@ static void vlv_read_wm_values(struct drm_i915_private *dev_priv,
 #undef _FW_WM
 #undef _FW_WM_VLV
 
-void g4x_wm_get_hw_state(struct drm_i915_private *dev_priv)
+static void g4x_wm_get_hw_state(struct drm_i915_private *dev_priv)
 {
 	struct g4x_wm_values *wm = &dev_priv->display.wm.g4x;
 	struct intel_crtc *crtc;
@@ -3580,7 +3580,7 @@ void g4x_wm_get_hw_state(struct drm_i915_private *dev_priv)
 		    str_yes_no(wm->fbc_en));
 }
 
-void g4x_wm_sanitize(struct drm_i915_private *dev_priv)
+static void g4x_wm_sanitize(struct drm_i915_private *dev_priv)
 {
 	struct intel_plane *plane;
 	struct intel_crtc *crtc;
@@ -3629,7 +3629,13 @@ void g4x_wm_sanitize(struct drm_i915_private *dev_priv)
 	mutex_unlock(&dev_priv->display.wm.wm_mutex);
 }
 
-void vlv_wm_get_hw_state(struct drm_i915_private *dev_priv)
+static void g4x_wm_get_hw_state_and_sanitize(struct drm_i915_private *i915)
+{
+	g4x_wm_get_hw_state(i915);
+	g4x_wm_sanitize(i915);
+}
+
+static void vlv_wm_get_hw_state(struct drm_i915_private *dev_priv)
 {
 	struct vlv_wm_values *wm = &dev_priv->display.wm.vlv;
 	struct intel_crtc *crtc;
@@ -3729,7 +3735,7 @@ void vlv_wm_get_hw_state(struct drm_i915_private *dev_priv)
 		    wm->sr.plane, wm->sr.cursor, wm->level, wm->cxsr);
 }
 
-void vlv_wm_sanitize(struct drm_i915_private *dev_priv)
+static void vlv_wm_sanitize(struct drm_i915_private *dev_priv)
 {
 	struct intel_plane *plane;
 	struct intel_crtc *crtc;
@@ -3775,6 +3781,12 @@ void vlv_wm_sanitize(struct drm_i915_private *dev_priv)
 	mutex_unlock(&dev_priv->display.wm.wm_mutex);
 }
 
+static void vlv_wm_get_hw_state_and_sanitize(struct drm_i915_private *i915)
+{
+	vlv_wm_get_hw_state(i915);
+	vlv_wm_sanitize(i915);
+}
+
 /*
  * FIXME should probably kill this and improve
  * the real watermark readout/sanitation instead
@@ -3791,7 +3803,7 @@ static void ilk_init_lp_watermarks(struct drm_i915_private *dev_priv)
 	 */
 }
 
-void ilk_wm_get_hw_state(struct drm_i915_private *dev_priv)
+static void ilk_wm_get_hw_state(struct drm_i915_private *dev_priv)
 {
 	struct ilk_wm_values *hw = &dev_priv->display.wm.hw;
 	struct intel_crtc *crtc;
@@ -3829,6 +3841,7 @@ static const struct intel_wm_funcs ilk_wm_funcs = {
 	.compute_intermediate_wm = ilk_compute_intermediate_wm,
 	.initial_watermarks = ilk_initial_watermarks,
 	.optimize_watermarks = ilk_optimize_watermarks,
+	.get_hw_state = ilk_wm_get_hw_state,
 };
 
 static const struct intel_wm_funcs vlv_wm_funcs = {
@@ -3837,6 +3850,7 @@ static const struct intel_wm_funcs vlv_wm_funcs = {
 	.initial_watermarks = vlv_initial_watermarks,
 	.optimize_watermarks = vlv_optimize_watermarks,
 	.atomic_update_watermarks = vlv_atomic_update_fifo,
+	.get_hw_state = vlv_wm_get_hw_state_and_sanitize,
 };
 
 static const struct intel_wm_funcs g4x_wm_funcs = {
@@ -3844,6 +3858,7 @@ static const struct intel_wm_funcs g4x_wm_funcs = {
 	.compute_intermediate_wm = g4x_compute_intermediate_wm,
 	.initial_watermarks = g4x_initial_watermarks,
 	.optimize_watermarks = g4x_optimize_watermarks,
+	.get_hw_state = g4x_wm_get_hw_state_and_sanitize,
 };
 
 static const struct intel_wm_funcs pnv_wm_funcs = {
@@ -3877,6 +3892,7 @@ void i9xx_wm_init(struct drm_i915_private *dev_priv)
 		     dev_priv->display.wm.spr_latency[0] && dev_priv->display.wm.cur_latency[0])) {
 			dev_priv->display.funcs.wm = &ilk_wm_funcs;
 		} else {
+			ilk_init_lp_watermarks(dev_priv);
 			drm_dbg_kms(&dev_priv->drm,
 				    "Failed to read display plane latency. "
 				    "Disable CxSR\n");

drivers/gpu/drm/i915/display/i9xx_wm.h

@@ -13,11 +13,6 @@ struct intel_crtc_state;
 struct intel_plane_state;
 
 int ilk_wm_max_level(const struct drm_i915_private *i915);
-void g4x_wm_get_hw_state(struct drm_i915_private *i915);
-void vlv_wm_get_hw_state(struct drm_i915_private *i915);
-void ilk_wm_get_hw_state(struct drm_i915_private *i915);
-void g4x_wm_sanitize(struct drm_i915_private *i915);
-void vlv_wm_sanitize(struct drm_i915_private *i915);
 bool ilk_disable_lp_wm(struct drm_i915_private *i915);
 bool intel_set_memory_cxsr(struct drm_i915_private *i915, bool enable);
 void i9xx_wm_init(struct drm_i915_private *i915);

drivers/gpu/drm/i915/display/intel_display_core.h

@@ -85,6 +85,7 @@ struct intel_wm_funcs {
 	void (*optimize_watermarks)(struct intel_atomic_state *state,
 				    struct intel_crtc *crtc);
 	int (*compute_global_watermarks)(struct intel_atomic_state *state);
+	void (*get_hw_state)(struct drm_i915_private *i915);
 };
 
 struct intel_audio_state {

drivers/gpu/drm/i915/display/intel_modeset_setup.c

@@ -25,6 +25,7 @@
 #include "intel_modeset_setup.h"
 #include "intel_pch_display.h"
 #include "intel_pm.h"
+#include "intel_wm.h"
 #include "skl_watermark.h"
 
 static void intel_crtc_disable_noatomic(struct intel_crtc *crtc,
@@ -724,18 +725,7 @@ void intel_modeset_setup_hw_state(struct drm_i915_private *i915,
 
 	intel_dpll_sanitize_state(i915);
 
-	if (IS_G4X(i915)) {
-		g4x_wm_get_hw_state(i915);
-		g4x_wm_sanitize(i915);
-	} else if (IS_VALLEYVIEW(i915) || IS_CHERRYVIEW(i915)) {
-		vlv_wm_get_hw_state(i915);
-		vlv_wm_sanitize(i915);
-	} else if (DISPLAY_VER(i915) >= 9) {
-		skl_wm_get_hw_state(i915);
-		skl_wm_sanitize(i915);
-	} else if (HAS_PCH_SPLIT(i915)) {
-		ilk_wm_get_hw_state(i915);
-	}
+	intel_wm_get_hw_state(i915);
 
 	for_each_intel_crtc(&i915->drm, crtc) {
 		struct intel_crtc_state *crtc_state =

drivers/gpu/drm/i915/display/intel_wm.c

@@ -114,6 +114,12 @@ int intel_compute_global_watermarks(struct intel_atomic_state *state)
 	return 0;
 }
 
+void intel_wm_get_hw_state(struct drm_i915_private *i915)
+{
+	if (i915->display.funcs.wm->get_hw_state)
+		return i915->display.funcs.wm->get_hw_state(i915);
+}
+
 bool intel_wm_plane_visible(const struct intel_crtc_state *crtc_state,
 			    const struct intel_plane_state *plane_state)
 {

drivers/gpu/drm/i915/display/intel_wm.h

@@ -26,6 +26,7 @@ void intel_atomic_update_watermarks(struct intel_atomic_state *state,
 void intel_optimize_watermarks(struct intel_atomic_state *state,
 			       struct intel_crtc *crtc);
 int intel_compute_global_watermarks(struct intel_atomic_state *state);
+void intel_wm_get_hw_state(struct drm_i915_private *i915);
 bool intel_wm_plane_visible(const struct intel_crtc_state *crtc_state,
 			    const struct intel_plane_state *plane_state);
 void intel_print_wm_latency(struct drm_i915_private *i915,

drivers/gpu/drm/i915/display/skl_watermark.c

@@ -2859,7 +2859,7 @@ static void skl_pipe_wm_get_hw_state(struct intel_crtc *crtc,
 	}
 }
 
-void skl_wm_get_hw_state(struct drm_i915_private *i915)
+static void skl_wm_get_hw_state(struct drm_i915_private *i915)
 {
 	struct intel_dbuf_state *dbuf_state =
 		to_intel_dbuf_state(i915->display.dbuf.obj.state);
@@ -2959,7 +2959,7 @@ static bool skl_dbuf_is_misconfigured(struct drm_i915_private *i915)
 	return false;
 }
 
-void skl_wm_sanitize(struct drm_i915_private *i915)
+static void skl_wm_sanitize(struct drm_i915_private *i915)
 {
 	struct intel_crtc *crtc;
 
@@ -2995,6 +2995,12 @@ void skl_wm_sanitize(struct drm_i915_private *i915)
 	}
 }
 
+static void skl_wm_get_hw_state_and_sanitize(struct drm_i915_private *i915)
+{
+	skl_wm_get_hw_state(i915);
+	skl_wm_sanitize(i915);
+}
+
 void intel_wm_state_verify(struct intel_crtc *crtc,
 			   struct intel_crtc_state *new_crtc_state)
 {
@@ -3272,6 +3278,7 @@ static void skl_setup_wm_latency(struct drm_i915_private *i915)
 
 static const struct intel_wm_funcs skl_wm_funcs = {
 	.compute_global_watermarks = skl_compute_wm,
+	.get_hw_state = skl_wm_get_hw_state_and_sanitize,
 };
 
 void skl_wm_init(struct drm_i915_private *i915)

drivers/gpu/drm/i915/display/skl_watermark.h

@@ -38,9 +38,6 @@ bool skl_ddb_allocation_overlaps(const struct skl_ddb_entry *ddb,
 				 const struct skl_ddb_entry *entries,
 				 int num_entries, int ignore_idx);
 
-void skl_wm_get_hw_state(struct drm_i915_private *i915);
-void skl_wm_sanitize(struct drm_i915_private *i915);
-
 void intel_wm_state_verify(struct intel_crtc *crtc,
 			   struct intel_crtc_state *new_crtc_state);