[PATCH v7 3/7] drm/i915/scaler: Refactor max_scale computation

[Mitul Golani <mitulkumar.ajitkumar.golani@intel.com>]

Refactor max scaling factor computation into a reusable
function for scalers.

--v2:
- Add missing comment. [Ankit]

Signed-off-by: Mitul Golani <mitulkumar.ajitkumar.golani@intel.com>
Reviewed-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
---
 drivers/gpu/drm/i915/display/skl_scaler.c | 70 +++++++++++++----------
 1 file changed, 41 insertions(+), 29 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/skl_scaler.c b/drivers/gpu/drm/i915/display/skl_scaler.c
index 12efa4008027..a832cdccd9fa 100644
--- a/drivers/gpu/drm/i915/display/skl_scaler.c
+++ b/drivers/gpu/drm/i915/display/skl_scaler.c
@@ -319,6 +319,44 @@ static int intel_allocate_scaler(struct intel_crtc_scaler_state *scaler_state,
 	return -1;
 }
 
+static void
+calculate_max_scale(struct intel_crtc *crtc,
+		    bool is_yuv_semiplanar,
+		    int scaler_id,
+		    int *max_hscale, int *max_vscale)
+{
+	struct intel_display *display = to_intel_display(crtc);
+
+	/*
+	 * FIXME: When two scalers are needed, but only one of
+	 * them needs to downscale, we should make sure that
+	 * the one that needs downscaling support is assigned
+	 * as the first scaler, so we don't reject downscaling
+	 * unnecessarily.
+	 */
+
+	if (DISPLAY_VER(display) >= 14) {
+		/*
+		 * On versions 14 and up, only the first
+		 * scaler supports a vertical scaling factor
+		 * of more than 1.0, while a horizontal
+		 * scaling factor of 3.0 is supported.
+		 */
+		*max_hscale = 0x30000 - 1;
+
+		if (scaler_id == 0)
+			*max_vscale = 0x30000 - 1;
+		else
+			*max_vscale = 0x10000;
+	} else if (DISPLAY_VER(display) >= 10 || !is_yuv_semiplanar) {
+		*max_hscale = 0x30000 - 1;
+		*max_vscale = 0x30000 - 1;
+	} else {
+		*max_hscale = 0x20000 - 1;
+		*max_vscale = 0x20000 - 1;
+	}
+}
+
 static int intel_atomic_setup_scaler(struct intel_crtc_state *crtc_state,
 				     int num_scalers_need, struct intel_crtc *crtc,
 				     const char *name, int idx,
@@ -388,35 +426,9 @@ static int intel_atomic_setup_scaler(struct intel_crtc_state *crtc_state,
 		const struct drm_rect *dst = &plane_state->uapi.dst;
 		int hscale, vscale, max_vscale, max_hscale;
 
-		/*
-		 * FIXME: When two scalers are needed, but only one of
-		 * them needs to downscale, we should make sure that
-		 * the one that needs downscaling support is assigned
-		 * as the first scaler, so we don't reject downscaling
-		 * unnecessarily.
-		 */
-
-		if (DISPLAY_VER(display) >= 14) {
-			/*
-			 * On versions 14 and up, only the first
-			 * scaler supports a vertical scaling factor
-			 * of more than 1.0, while a horizontal
-			 * scaling factor of 3.0 is supported.
-			 */
-			max_hscale = 0x30000 - 1;
-			if (*scaler_id == 0)
-				max_vscale = 0x30000 - 1;
-			else
-				max_vscale = 0x10000;
-
-		} else if (DISPLAY_VER(display) >= 10 ||
-			   !intel_format_info_is_yuv_semiplanar(fb->format, fb->modifier)) {
-			max_hscale = 0x30000 - 1;
-			max_vscale = 0x30000 - 1;
-		} else {
-			max_hscale = 0x20000 - 1;
-			max_vscale = 0x20000 - 1;
-		}
+		calculate_max_scale(crtc,
+				    intel_format_info_is_yuv_semiplanar(fb->format, fb->modifier),
+				    *scaler_id, &max_hscale, &max_vscale);
 
 		/*
 		 * FIXME: We should change the if-else block above to
-- 
2.48.1