drm/i915: Use the memory latency based WM computation on VLV too

In order to get decnet memory self refresh residency on VLV, flip it
over to the new CHV way of doing things. VLV doesn't do PM5 or DDR DVFS
so it's a bit simpler.

I'm not sure the currently memory latency used for CHV is really
appropriate for VLV. Some further testing will probably be needed to
figure that out.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Clint Taylor <Clinton.A.Taylor@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/intel_display.c

@@ -15455,7 +15455,7 @@ void intel_modeset_setup_hw_state(struct drm_device *dev,
 		pll->on = false;
 	}
 
-	if (IS_CHERRYVIEW(dev))
+	if (IS_VALLEYVIEW(dev))
 		vlv_wm_get_hw_state(dev);
 	else if (IS_GEN9(dev))
 		skl_wm_get_hw_state(dev);

drivers/gpu/drm/i915/intel_pm.c

@@ -931,77 +931,6 @@ static void vlv_write_wm_values(struct intel_crtc *crtc,
 
 #undef FW_WM_VLV
 
-static uint8_t vlv_compute_drain_latency(struct drm_crtc *crtc,
-					 struct drm_plane *plane)
-{
-	struct drm_device *dev = crtc->dev;
-	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
-	int entries, prec_mult, drain_latency, pixel_size;
-	int clock = intel_crtc->config->base.adjusted_mode.crtc_clock;
-	const int high_precision = IS_CHERRYVIEW(dev) ? 16 : 64;
-
-	/*
-	 * FIXME the plane might have an fb
-	 * but be invisible (eg. due to clipping)
-	 */
-	if (!intel_crtc->active || !plane->state->fb)
-		return 0;
-
-	if (WARN(clock == 0, "Pixel clock is zero!\n"))
-		return 0;
-
-	pixel_size = drm_format_plane_cpp(plane->state->fb->pixel_format, 0);
-
-	if (WARN(pixel_size == 0, "Pixel size is zero!\n"))
-		return 0;
-
-	entries = DIV_ROUND_UP(clock, 1000) * pixel_size;
-
-	prec_mult = high_precision;
-	drain_latency = 64 * prec_mult * 4 / entries;
-
-	if (drain_latency > DRAIN_LATENCY_MASK) {
-		prec_mult /= 2;
-		drain_latency = 64 * prec_mult * 4 / entries;
-	}
-
-	if (drain_latency > DRAIN_LATENCY_MASK)
-		drain_latency = DRAIN_LATENCY_MASK;
-
-	return drain_latency | (prec_mult == high_precision ?
-				DDL_PRECISION_HIGH : DDL_PRECISION_LOW);
-}
-
-static int vlv_compute_wm(struct intel_crtc *crtc,
-			  struct intel_plane *plane,
-			  int fifo_size)
-{
-	int clock, entries, pixel_size;
-
-	/*
-	 * FIXME the plane might have an fb
-	 * but be invisible (eg. due to clipping)
-	 */
-	if (!crtc->active || !plane->base.state->fb)
-		return 0;
-
-	pixel_size = drm_format_plane_cpp(plane->base.state->fb->pixel_format, 0);
-	clock = crtc->config->base.adjusted_mode.crtc_clock;
-
-	entries = DIV_ROUND_UP(clock, 1000) * pixel_size;
-
-	/*
-	 * Set up the watermark such that we don't start issuing memory
-	 * requests until we are within PND's max deadline value (256us).
-	 * Idea being to be idle as long as possible while still taking
-	 * advatange of PND's deadline scheduling. The limit of 8
-	 * cachelines (used when the FIFO will anyway drain in less time
-	 * than 256us) should match what we would be done if trickle
-	 * feed were enabled.
-	 */
-	return fifo_size - clamp(DIV_ROUND_UP(256 * entries, 64), 0, fifo_size - 8);
-}
-
 enum vlv_wm_level {
 	VLV_WM_LEVEL_PM2,
 	VLV_WM_LEVEL_PM5,
@@ -1076,101 +1005,6 @@ static uint16_t vlv_compute_wm_level(struct intel_plane *plane,
 	return min_t(int, wm, USHRT_MAX);
 }
 
-static bool vlv_compute_sr_wm(struct drm_device *dev,
-			      struct vlv_wm_values *wm)
-{
-	struct drm_i915_private *dev_priv = to_i915(dev);
-	struct drm_crtc *crtc;
-	enum pipe pipe = INVALID_PIPE;
-	int num_planes = 0;
-	int fifo_size = 0;
-	struct intel_plane *plane;
-
-	wm->sr.cursor = wm->sr.plane = 0;
-
-	crtc = single_enabled_crtc(dev);
-	/* maxfifo not supported on pipe C */
-	if (crtc && to_intel_crtc(crtc)->pipe != PIPE_C) {
-		pipe = to_intel_crtc(crtc)->pipe;
-		num_planes = !!wm->pipe[pipe].primary +
-			!!wm->pipe[pipe].sprite[0] +
-			!!wm->pipe[pipe].sprite[1];
-		fifo_size = INTEL_INFO(dev_priv)->num_pipes * 512 - 1;
-	}
-
-	if (fifo_size == 0 || num_planes > 1)
-		return false;
-
-	wm->sr.cursor = vlv_compute_wm(to_intel_crtc(crtc),
-				       to_intel_plane(crtc->cursor), 0x3f);
-
-	list_for_each_entry(plane, &dev->mode_config.plane_list, base.head) {
-		if (plane->base.type == DRM_PLANE_TYPE_CURSOR)
-			continue;
-
-		if (plane->pipe != pipe)
-			continue;
-
-		wm->sr.plane = vlv_compute_wm(to_intel_crtc(crtc),
-					      plane, fifo_size);
-		if (wm->sr.plane != 0)
-			break;
-	}
-
-	return true;
-}
-
-static void valleyview_update_wm(struct drm_crtc *crtc)
-{
-	struct drm_device *dev = crtc->dev;
-	struct drm_i915_private *dev_priv = dev->dev_private;
-	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
-	enum pipe pipe = intel_crtc->pipe;
-	bool cxsr_enabled;
-	struct vlv_wm_values wm = dev_priv->wm.vlv;
-
-	wm.ddl[pipe].primary = vlv_compute_drain_latency(crtc, crtc->primary);
-	wm.pipe[pipe].primary = vlv_compute_wm(intel_crtc,
-					       to_intel_plane(crtc->primary),
-					       vlv_get_fifo_size(dev, pipe, 0));
-
-	wm.ddl[pipe].cursor = vlv_compute_drain_latency(crtc, crtc->cursor);
-	wm.pipe[pipe].cursor = vlv_compute_wm(intel_crtc,
-					      to_intel_plane(crtc->cursor),
-					      0x3f);
-
-	cxsr_enabled = vlv_compute_sr_wm(dev, &wm);
-
-	if (memcmp(&wm, &dev_priv->wm.vlv, sizeof(wm)) == 0)
-		return;
-
-	DRM_DEBUG_KMS("Setting FIFO watermarks - %c: plane=%d, cursor=%d, "
-		      "SR: plane=%d, cursor=%d\n", pipe_name(pipe),
-		      wm.pipe[pipe].primary, wm.pipe[pipe].cursor,
-		      wm.sr.plane, wm.sr.cursor);
-
-	/*
-	 * FIXME DDR DVFS introduces massive memory latencies which
-	 * are not known to system agent so any deadline specified
-	 * by the display may not be respected. To support DDR DVFS
-	 * the watermark code needs to be rewritten to essentially
-	 * bypass deadline mechanism and rely solely on the
-	 * watermarks. For now disable DDR DVFS.
-	 */
-	if (IS_CHERRYVIEW(dev_priv))
-		chv_set_memory_dvfs(dev_priv, false);
-
-	if (!cxsr_enabled)
-		intel_set_memory_cxsr(dev_priv, false);
-
-	vlv_write_wm_values(intel_crtc, &wm);
-
-	if (cxsr_enabled)
-		intel_set_memory_cxsr(dev_priv, true);
-
-	dev_priv->wm.vlv = wm;
-}
-
 static void vlv_compute_fifo(struct intel_crtc *crtc)
 {
 	struct drm_device *dev = crtc->base.dev;
@@ -1272,7 +1106,7 @@ static void vlv_invert_wms(struct intel_crtc *crtc)
 	}
 }
 
-static void _vlv_compute_wm(struct intel_crtc *crtc)
+static void vlv_compute_wm(struct intel_crtc *crtc)
 {
 	struct drm_device *dev = crtc->base.dev;
 	struct vlv_wm_state *wm_state = &crtc->wm_state;
@@ -1518,7 +1352,7 @@ static void vlv_update_wm(struct drm_crtc *crtc)
 	enum pipe pipe = intel_crtc->pipe;
 	struct vlv_wm_values wm = {};
 
-	_vlv_compute_wm(intel_crtc);
+	vlv_compute_wm(intel_crtc);
 	vlv_merge_wm(dev, &wm);
 
 	if (memcmp(&dev_priv->wm.vlv, &wm, sizeof(wm)) == 0) {
@@ -1567,54 +1401,6 @@ static void vlv_update_wm(struct drm_crtc *crtc)
 	dev_priv->wm.vlv = wm;
 }
 
-static void valleyview_update_sprite_wm(struct drm_plane *plane,
-					struct drm_crtc *crtc,
-					uint32_t sprite_width,
-					uint32_t sprite_height,
-					int pixel_size,
-					bool enabled, bool scaled)
-{
-	struct drm_device *dev = crtc->dev;
-	struct drm_i915_private *dev_priv = dev->dev_private;
-	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
-	enum pipe pipe = intel_crtc->pipe;
-	int sprite = to_intel_plane(plane)->plane;
-	bool cxsr_enabled;
-	struct vlv_wm_values wm = dev_priv->wm.vlv;
-
-	if (enabled) {
-		wm.ddl[pipe].sprite[sprite] =
-			vlv_compute_drain_latency(crtc, plane);
-
-		wm.pipe[pipe].sprite[sprite] =
-			vlv_compute_wm(intel_crtc,
-				       to_intel_plane(plane),
-				       vlv_get_fifo_size(dev, pipe, sprite+1));
-	} else {
-		wm.ddl[pipe].sprite[sprite] = 0;
-		wm.pipe[pipe].sprite[sprite] = 0;
-	}
-
-	cxsr_enabled = vlv_compute_sr_wm(dev, &wm);
-
-	if (memcmp(&wm, &dev_priv->wm.vlv, sizeof(wm)) == 0)
-		return;
-
-	DRM_DEBUG_KMS("Setting FIFO watermarks - %c: sprite %c=%d, "
-		      "SR: plane=%d, cursor=%d\n", pipe_name(pipe),
-		      sprite_name(pipe, sprite),
-		      wm.pipe[pipe].sprite[sprite],
-		      wm.sr.plane, wm.sr.cursor);
-
-	if (!cxsr_enabled)
-		intel_set_memory_cxsr(dev_priv, false);
-
-	vlv_write_wm_values(intel_crtc, &wm);
-
-	if (cxsr_enabled)
-		intel_set_memory_cxsr(dev_priv, true);
-}
-
 #define single_plane_enabled(mask) is_power_of_2(mask)
 
 static void g4x_update_wm(struct drm_crtc *crtc)
@@ -7297,8 +7083,9 @@ void intel_init_pm(struct drm_device *dev)
 		dev_priv->display.init_clock_gating =
 			cherryview_init_clock_gating;
 	} else if (IS_VALLEYVIEW(dev)) {
-		dev_priv->display.update_wm = valleyview_update_wm;
-		dev_priv->display.update_sprite_wm = valleyview_update_sprite_wm;
+		vlv_setup_wm_latency(dev);
+
+		dev_priv->display.update_wm = vlv_update_wm;
 		dev_priv->display.init_clock_gating =
 			valleyview_init_clock_gating;
 	} else if (IS_PINEVIEW(dev)) {

drivers/gpu/drm/i915/intel_sprite.c

@@ -402,10 +402,6 @@ vlv_update_plane(struct drm_plane *dplane, struct drm_crtc *crtc,
 	if (obj->tiling_mode != I915_TILING_NONE)
 		sprctl |= SP_TILED;
 
-	intel_update_sprite_watermarks(dplane, crtc, src_w, src_h,
-				       pixel_size, true,
-				       src_w != crtc_w || src_h != crtc_h);
-
 	/* Sizes are 0 based */
 	src_w--;
 	src_h--;
@@ -470,8 +466,6 @@ vlv_disable_plane(struct drm_plane *dplane, struct drm_crtc *crtc)
 
 	I915_WRITE(SPSURF(pipe, plane), 0);
 	POSTING_READ(SPSURF(pipe, plane));
-
-	intel_update_sprite_watermarks(dplane, crtc, 0, 0, 0, false, false);
 }
 
 static void