drm/i915: Move intel_plane_atomic_calc_changes() & co. out

Exfiltrate intel_plane_atomic_calc_changes() and its friends from
intel_display.c to intel_atomic_plane.c since that is a much better
fit.

While at it also nuke the official looking kernel docs for
intel_wm_need_update() and flag it for eventual destruction so
that people don't get any wrong ideas about using it in new code.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220211090629.15555-2-ville.syrjala@linux.intel.com
Reviewed-by: Jani Nikula <jani.nikula@intel.com>

1 files changed, 180 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/display/intel_atomic_plane.c b/drivers/gpu/drm/i915/display/intel_atomic_plane.c
index 0e15fe908855..687fc2e3a0d8 100644
--- a/drivers/gpu/drm/i915/display/intel_atomic_plane.c
+++ b/drivers/gpu/drm/i915/display/intel_atomic_plane.c
@@ -45,6 +45,7 @@
 #include "intel_fb_pin.h"
 #include "intel_pm.h"
 #include "intel_sprite.h"
+#include "skl_scaler.h"
 
 static void intel_plane_state_reset(struct intel_plane_state *plane_state,
 				    struct intel_plane *plane)
@@ -330,6 +331,185 @@ void intel_plane_set_invisible(struct intel_crtc_state *crtc_state,
 	plane_state->uapi.visible = false;
 }
 
+/* FIXME nuke when all wm code is atomic */
+static bool intel_wm_need_update(const struct intel_plane_state *cur,
+				 struct intel_plane_state *new)
+{
+	/* Update watermarks on tiling or size changes. */
+	if (new->uapi.visible != cur->uapi.visible)
+		return true;
+
+	if (!cur->hw.fb || !new->hw.fb)
+		return false;
+
+	if (cur->hw.fb->modifier != new->hw.fb->modifier ||
+	    cur->hw.rotation != new->hw.rotation ||
+	    drm_rect_width(&new->uapi.src) != drm_rect_width(&cur->uapi.src) ||
+	    drm_rect_height(&new->uapi.src) != drm_rect_height(&cur->uapi.src) ||
+	    drm_rect_width(&new->uapi.dst) != drm_rect_width(&cur->uapi.dst) ||
+	    drm_rect_height(&new->uapi.dst) != drm_rect_height(&cur->uapi.dst))
+		return true;
+
+	return false;
+}
+
+static bool intel_plane_is_scaled(const struct intel_plane_state *plane_state)
+{
+	int src_w = drm_rect_width(&plane_state->uapi.src) >> 16;
+	int src_h = drm_rect_height(&plane_state->uapi.src) >> 16;
+	int dst_w = drm_rect_width(&plane_state->uapi.dst);
+	int dst_h = drm_rect_height(&plane_state->uapi.dst);
+
+	return src_w != dst_w || src_h != dst_h;
+}
+
+static bool intel_plane_do_async_flip(struct intel_plane *plane,
+				      const struct intel_crtc_state *old_crtc_state,
+				      const struct intel_crtc_state *new_crtc_state)
+{
+	struct drm_i915_private *i915 = to_i915(plane->base.dev);
+
+	if (!plane->async_flip)
+		return false;
+
+	if (!new_crtc_state->uapi.async_flip)
+		return false;
+
+	/*
+	 * In platforms after DISPLAY13, we might need to override
+	 * first async flip in order to change watermark levels
+	 * as part of optimization.
+	 * So for those, we are checking if this is a first async flip.
+	 * For platforms earlier than DISPLAY13 we always do async flip.
+	 */
+	return DISPLAY_VER(i915) < 13 || old_crtc_state->uapi.async_flip;
+}
+
+static int intel_plane_atomic_calc_changes(const struct intel_crtc_state *old_crtc_state,
+					   struct intel_crtc_state *new_crtc_state,
+					   const struct intel_plane_state *old_plane_state,
+					   struct intel_plane_state *new_plane_state)
+{
+	struct intel_crtc *crtc = to_intel_crtc(new_crtc_state->uapi.crtc);
+	struct intel_plane *plane = to_intel_plane(new_plane_state->uapi.plane);
+	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
+	bool mode_changed = intel_crtc_needs_modeset(new_crtc_state);
+	bool was_crtc_enabled = old_crtc_state->hw.active;
+	bool is_crtc_enabled = new_crtc_state->hw.active;
+	bool turn_off, turn_on, visible, was_visible;
+	int ret;
+
+	if (DISPLAY_VER(dev_priv) >= 9 && plane->id != PLANE_CURSOR) {
+		ret = skl_update_scaler_plane(new_crtc_state, new_plane_state);
+		if (ret)
+			return ret;
+	}
+
+	was_visible = old_plane_state->uapi.visible;
+	visible = new_plane_state->uapi.visible;
+
+	if (!was_crtc_enabled && drm_WARN_ON(&dev_priv->drm, was_visible))
+		was_visible = false;
+
+	/*
+	 * Visibility is calculated as if the crtc was on, but
+	 * after scaler setup everything depends on it being off
+	 * when the crtc isn't active.
+	 *
+	 * FIXME this is wrong for watermarks. Watermarks should also
+	 * be computed as if the pipe would be active. Perhaps move
+	 * per-plane wm computation to the .check_plane() hook, and
+	 * only combine the results from all planes in the current place?
+	 */
+	if (!is_crtc_enabled) {
+		intel_plane_set_invisible(new_crtc_state, new_plane_state);
+		visible = false;
+	}
+
+	if (!was_visible && !visible)
+		return 0;
+
+	turn_off = was_visible && (!visible || mode_changed);
+	turn_on = visible && (!was_visible || mode_changed);
+
+	drm_dbg_atomic(&dev_priv->drm,
+		       "[CRTC:%d:%s] with [PLANE:%d:%s] visible %i -> %i, off %i, on %i, ms %i\n",
+		       crtc->base.base.id, crtc->base.name,
+		       plane->base.base.id, plane->base.name,
+		       was_visible, visible,
+		       turn_off, turn_on, mode_changed);
+
+	if (turn_on) {
+		if (DISPLAY_VER(dev_priv) < 5 && !IS_G4X(dev_priv))
+			new_crtc_state->update_wm_pre = true;
+
+		/* must disable cxsr around plane enable/disable */
+		if (plane->id != PLANE_CURSOR)
+			new_crtc_state->disable_cxsr = true;
+	} else if (turn_off) {
+		if (DISPLAY_VER(dev_priv) < 5 && !IS_G4X(dev_priv))
+			new_crtc_state->update_wm_post = true;
+
+		/* must disable cxsr around plane enable/disable */
+		if (plane->id != PLANE_CURSOR)
+			new_crtc_state->disable_cxsr = true;
+	} else if (intel_wm_need_update(old_plane_state, new_plane_state)) {
+		if (DISPLAY_VER(dev_priv) < 5 && !IS_G4X(dev_priv)) {
+			/* FIXME bollocks */
+			new_crtc_state->update_wm_pre = true;
+			new_crtc_state->update_wm_post = true;
+		}
+	}
+
+	if (visible || was_visible)
+		new_crtc_state->fb_bits |= plane->frontbuffer_bit;
+
+	/*
+	 * ILK/SNB DVSACNTR/Sprite Enable
+	 * IVB SPR_CTL/Sprite Enable
+	 * "When in Self Refresh Big FIFO mode, a write to enable the
+	 *  plane will be internally buffered and delayed while Big FIFO
+	 *  mode is exiting."
+	 *
+	 * Which means that enabling the sprite can take an extra frame
+	 * when we start in big FIFO mode (LP1+). Thus we need to drop
+	 * down to LP0 and wait for vblank in order to make sure the
+	 * sprite gets enabled on the next vblank after the register write.
+	 * Doing otherwise would risk enabling the sprite one frame after
+	 * we've already signalled flip completion. We can resume LP1+
+	 * once the sprite has been enabled.
+	 *
+	 *
+	 * WaCxSRDisabledForSpriteScaling:ivb
+	 * IVB SPR_SCALE/Scaling Enable
+	 * "Low Power watermarks must be disabled for at least one
+	 *  frame before enabling sprite scaling, and kept disabled
+	 *  until sprite scaling is disabled."
+	 *
+	 * ILK/SNB DVSASCALE/Scaling Enable
+	 * "When in Self Refresh Big FIFO mode, scaling enable will be
+	 *  masked off while Big FIFO mode is exiting."
+	 *
+	 * Despite the w/a only being listed for IVB we assume that
+	 * the ILK/SNB note has similar ramifications, hence we apply
+	 * the w/a on all three platforms.
+	 *
+	 * With experimental results seems this is needed also for primary
+	 * plane, not only sprite plane.
+	 */
+	if (plane->id != PLANE_CURSOR &&
+	    (IS_IRONLAKE(dev_priv) || IS_SANDYBRIDGE(dev_priv) ||
+	     IS_IVYBRIDGE(dev_priv)) &&
+	    (turn_on || (!intel_plane_is_scaled(old_plane_state) &&
+			 intel_plane_is_scaled(new_plane_state))))
+		new_crtc_state->disable_lp_wm = true;
+
+	if (intel_plane_do_async_flip(plane, old_crtc_state, new_crtc_state))
+		new_plane_state->do_async_flip = true;
+
+	return 0;
+}
+
 int intel_plane_atomic_check_with_state(const struct intel_crtc_state *old_crtc_state,
 					struct intel_crtc_state *new_crtc_state,
 					const struct intel_plane_state *old_plane_state,