drm/i915: Fix SKL cursor watermarks

Use intel_wm_plane_visible() to determine cursor visibility for SKL+
also. Previously SKL+ would check the actual visibility which now
conflicts with the assumptions in intel_legacy_cursor_update().

We also change SKL+ to compute the cursor watermarks based on the
unclipped cursor size, just as we do on all the other platforms.
Using the clipped size could now result in garbage results.

Testcase: igt/kms_chv_cursor_fail
Fixes: a5509ab ("drm/i915: Fix legacy cursor vs. watermarks for ILK-BDW")
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=100195
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170314151050.12194-2-ville.syrjala@linux.intel.com
Tested-by: Dorota Czaplejewicz <dorota.czaplejewicz@collabora.co.uk>
Tested-by: Jari Tahvanainen <jari.tahvanainen@intel.com>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Acked-by: Ander Conselvan de Oliveira <conselvan2@gmail.com>

drivers/gpu/drm/i915/intel_pm.c

@@ -3361,19 +3361,29 @@ void skl_ddb_get_hw_state(struct drm_i915_private *dev_priv,
  * Caller should take care of dividing & rounding off the value.
  */
 static uint32_t
-skl_plane_downscale_amount(const struct intel_plane_state *pstate)
+skl_plane_downscale_amount(const struct intel_crtc_state *cstate,
+			   const struct intel_plane_state *pstate)
 {
+	struct intel_plane *plane = to_intel_plane(pstate->base.plane);
 	uint32_t downscale_h, downscale_w;
 	uint32_t src_w, src_h, dst_w, dst_h;
 
-	if (WARN_ON(!pstate->base.visible))
+	if (WARN_ON(!intel_wm_plane_visible(cstate, pstate)))
 		return DRM_PLANE_HELPER_NO_SCALING;
 
 	/* n.b., src is 16.16 fixed point, dst is whole integer */
-	src_w = drm_rect_width(&pstate->base.src);
-	src_h = drm_rect_height(&pstate->base.src);
-	dst_w = drm_rect_width(&pstate->base.dst);
-	dst_h = drm_rect_height(&pstate->base.dst);
+	if (plane->id == PLANE_CURSOR) {
+		src_w = pstate->base.src_w;
+		src_h = pstate->base.src_h;
+		dst_w = pstate->base.crtc_w;
+		dst_h = pstate->base.crtc_h;
+	} else {
+		src_w = drm_rect_width(&pstate->base.src);
+		src_h = drm_rect_height(&pstate->base.src);
+		dst_w = drm_rect_width(&pstate->base.dst);
+		dst_h = drm_rect_height(&pstate->base.dst);
+	}
+
 	if (drm_rotation_90_or_270(pstate->base.rotation))
 		swap(dst_w, dst_h);
 
@@ -3389,6 +3399,7 @@ skl_plane_relative_data_rate(const struct intel_crtc_state *cstate,
 			     const struct drm_plane_state *pstate,
 			     int y)
 {
+	struct intel_plane *plane = to_intel_plane(pstate->plane);
 	struct intel_plane_state *intel_pstate = to_intel_plane_state(pstate);
 	uint32_t down_scale_amount, data_rate;
 	uint32_t width = 0, height = 0;
@@ -3401,7 +3412,7 @@ skl_plane_relative_data_rate(const struct intel_crtc_state *cstate,
 	fb = pstate->fb;
 	format = fb->format->format;
 
-	if (pstate->plane->type == DRM_PLANE_TYPE_CURSOR)
+	if (plane->id == PLANE_CURSOR)
 		return 0;
 	if (y && format != DRM_FORMAT_NV12)
 		return 0;
@@ -3425,7 +3436,7 @@ skl_plane_relative_data_rate(const struct intel_crtc_state *cstate,
 		data_rate = width * height * fb->format->cpp[0];
 	}
 
-	down_scale_amount = skl_plane_downscale_amount(intel_pstate);
+	down_scale_amount = skl_plane_downscale_amount(cstate, intel_pstate);
 
 	return (uint64_t)data_rate * down_scale_amount >> 16;
 }
@@ -3717,15 +3728,15 @@ static uint32_t skl_adjusted_plane_pixel_rate(const struct intel_crtc_state *cst
 	uint64_t pixel_rate;
 
 	/* Shouldn't reach here on disabled planes... */
-	if (WARN_ON(!pstate->base.visible))
+	if (WARN_ON(!intel_wm_plane_visible(cstate, pstate)))
 		return 0;
 
 	/*
 	 * Adjusted plane pixel rate is just the pipe's adjusted pixel rate
 	 * with additional adjustments for plane-specific scaling.
 	 */
 	adjusted_pixel_rate = cstate->pixel_rate;
-	downscale_amount = skl_plane_downscale_amount(pstate);
+	downscale_amount = skl_plane_downscale_amount(cstate, pstate);
 
 	pixel_rate = adjusted_pixel_rate * downscale_amount >> 16;
 	WARN_ON(pixel_rate != clamp_t(uint32_t, pixel_rate, 0, ~0));
@@ -3742,6 +3753,7 @@ static int skl_compute_plane_wm(const struct drm_i915_private *dev_priv,
 				uint8_t *out_lines, /* out */
 				bool *enabled /* out */)
 {
+	struct intel_plane *plane = to_intel_plane(intel_pstate->base.plane);
 	struct drm_plane_state *pstate = &intel_pstate->base;
 	struct drm_framebuffer *fb = pstate->fb;
 	uint32_t latency = dev_priv->wm.skl_latency[level];
@@ -3761,7 +3773,8 @@ static int skl_compute_plane_wm(const struct drm_i915_private *dev_priv,
 	bool apply_memory_bw_wa = skl_needs_memory_bw_wa(state);
 	bool y_tiled, x_tiled;
 
-	if (latency == 0 || !cstate->base.active || !intel_pstate->base.visible) {
+	if (latency == 0 ||
+	    !intel_wm_plane_visible(cstate, intel_pstate)) {
 		*enabled = false;
 		return 0;
 	}
@@ -3777,8 +3790,13 @@ static int skl_compute_plane_wm(const struct drm_i915_private *dev_priv,
 	if (apply_memory_bw_wa && x_tiled)
 		latency += 15;
 
-	width = drm_rect_width(&intel_pstate->base.src) >> 16;
-	height = drm_rect_height(&intel_pstate->base.src) >> 16;
+	if (plane->id == PLANE_CURSOR) {
+		width = intel_pstate->base.crtc_w;
+		height = intel_pstate->base.crtc_h;
+	} else {
+		width = drm_rect_width(&intel_pstate->base.src) >> 16;
+		height = drm_rect_height(&intel_pstate->base.src) >> 16;
+	}
 
 	if (drm_rotation_90_or_270(pstate->rotation))
 		swap(width, height);