[PATCH 15/19] drm/i915: Simplify skl_max_scale()

[Ville Syrjala]

From: Ville Syrjälä <ville.syrjala at linux.intel.com>

Now that the planes declare their minimum cdclk requirements properly
we don't need to check the cdclk in skl_max_scale() anymore. Just check
against the maximum downscale ratio, and move the code next to it's
only caller.

Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
 drivers/gpu/drm/i915/display/intel_display.c | 38 --------------------
 drivers/gpu/drm/i915/display/intel_sprite.c  | 12 ++++++-
 drivers/gpu/drm/i915/intel_drv.h             |  2 --
 3 files changed, 11 insertions(+), 41 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index 1e67fbe50476..489620ef476b 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -14525,44 +14525,6 @@ intel_cleanup_plane_fb(struct drm_plane *plane,
 	mutex_unlock(&dev_priv->drm.struct_mutex);
 }
 
-int
-skl_max_scale(const struct intel_crtc_state *crtc_state,
-	      const struct drm_format_info *format)
-{
-	struct intel_crtc *crtc = to_intel_crtc(crtc_state->base.crtc);
-	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
-	int max_scale;
-	int crtc_clock, max_dotclk, tmpclk1, tmpclk2;
-
-	if (!crtc_state->base.enable)
-		return DRM_PLANE_HELPER_NO_SCALING;
-
-	crtc_clock = crtc_state->base.adjusted_mode.crtc_clock;
-	max_dotclk = to_intel_atomic_state(crtc_state->base.state)->cdclk.logical.cdclk;
-
-	if (IS_GEMINILAKE(dev_priv) || INTEL_GEN(dev_priv) >= 10)
-		max_dotclk *= 2;
-
-	if (WARN_ON_ONCE(!crtc_clock || max_dotclk < crtc_clock))
-		return DRM_PLANE_HELPER_NO_SCALING;
-
-	/*
-	 * skl max scale is lower of:
-	 *    close to 3 but not 3, -1 is for that purpose
-	 *            or
-	 *    cdclk/crtc_clock
-	 */
-	if (INTEL_GEN(dev_priv) >= 10 || IS_GEMINILAKE(dev_priv) ||
-	    !drm_format_info_is_yuv_semiplanar(format))
-		tmpclk1 = 0x30000 - 1;
-	else
-		tmpclk1 = 0x20000 - 1;
-	tmpclk2 = (1 << 8) * ((max_dotclk << 8) / crtc_clock);
-	max_scale = min(tmpclk1, tmpclk2);
-
-	return max_scale;
-}
-
 static void intel_begin_crtc_commit(struct intel_atomic_state *state,
 				    struct intel_crtc *crtc)
 {
diff --git a/drivers/gpu/drm/i915/display/intel_sprite.c b/drivers/gpu/drm/i915/display/intel_sprite.c
index a07887279e1a..0ffbec8291ee 100644
--- a/drivers/gpu/drm/i915/display/intel_sprite.c
+++ b/drivers/gpu/drm/i915/display/intel_sprite.c
@@ -2089,6 +2089,16 @@ static int skl_plane_check_nv12_rotation(const struct intel_plane_state *plane_s
 	return 0;
 }
 
+static int skl_plane_max_scale(struct drm_i915_private *dev_priv,
+			       const struct drm_framebuffer *fb)
+{
+	if (INTEL_GEN(dev_priv) >= 10 || IS_GEMINILAKE(dev_priv) ||
+	    !drm_format_info_is_yuv_semiplanar(fb->format))
+		return 0x30000 - 1;
+	else
+		return 0x20000 - 1;
+}
+
 static int skl_plane_check(struct intel_crtc_state *crtc_state,
 			   struct intel_plane_state *plane_state)
 {
@@ -2106,7 +2116,7 @@ static int skl_plane_check(struct intel_crtc_state *crtc_state,
 	/* use scaler when colorkey is not required */
 	if (!plane_state->ckey.flags && intel_fb_scalable(fb)) {
 		min_scale = 1;
-		max_scale = skl_max_scale(crtc_state, fb->format);
+		max_scale = skl_plane_max_scale(dev_priv, fb);
 	}
 
 	ret = drm_atomic_helper_check_plane_state(&plane_state->base,
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 999ad3166cd1..02eeaec86997 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -1620,8 +1620,6 @@ void intel_crtc_arm_fifo_underrun(struct intel_crtc *crtc,
 
 u16 skl_scaler_calc_phase(int sub, int scale, bool chroma_center);
 int skl_update_scaler_crtc(struct intel_crtc_state *crtc_state);
-int skl_max_scale(const struct intel_crtc_state *crtc_state,
-		  const struct drm_format_info *format);
 
 static inline u32 intel_plane_ggtt_offset(const struct intel_plane_state *state)
 {
-- 
2.21.0