drm/i915: Introduce HAS_SAGV()

Introuce a HAS_SAGV() macro to answer the question whether
the platform in general supports SAGV. intel_has_sagv() will
keep on giving us the more specific answer whether the current
device supports SAGV or not.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230131002127.29305-2-ville.syrjala@linux.intel.comReviewed-by: Jani Nikula <jani.nikula@intel.com>

drivers/gpu/drm/i915/display/skl_watermark.c

@@ -64,7 +64,7 @@ static bool skl_needs_memory_bw_wa(struct drm_i915_private *i915)
 static bool
 intel_has_sagv(struct drm_i915_private *i915)
 {
-	return DISPLAY_VER(i915) >= 9 && !IS_LP(i915) &&
+	return HAS_SAGV(i915) &&
 		i915->display.sagv.status != I915_SAGV_NOT_CONTROLLED;
 }
 
@@ -92,7 +92,7 @@ intel_sagv_block_time(struct drm_i915_private *i915)
 		return val;
 	} else if (DISPLAY_VER(i915) == 11) {
 		return 10;
-	} else if (DISPLAY_VER(i915) == 9 && !IS_LP(i915)) {
+	} else if (HAS_SAGV(i915)) {
 		return 30;
 	} else {
 		return 0;
@@ -101,7 +101,7 @@ intel_sagv_block_time(struct drm_i915_private *i915)
 
 static void intel_sagv_init(struct drm_i915_private *i915)
 {
-	if (!intel_has_sagv(i915))
+	if (!HAS_SAGV(i915))
 		i915->display.sagv.status = I915_SAGV_NOT_CONTROLLED;
 
 	/*

drivers/gpu/drm/i915/i915_drv.h

@@ -860,6 +860,7 @@ IS_SUBPLATFORM(const struct drm_i915_private *i915,
 #define HAS_64K_PAGES(dev_priv) (INTEL_INFO(dev_priv)->has_64k_pages)
 
 #define HAS_IPC(dev_priv)		(INTEL_INFO(dev_priv)->display.has_ipc)
+#define HAS_SAGV(dev_priv)		(DISPLAY_VER(dev_priv) >= 9 && !IS_LP(dev_priv))
 
 #define HAS_REGION(i915, i) (RUNTIME_INFO(i915)->memory_regions & (i))
 #define HAS_LMEM(i915) HAS_REGION(i915, REGION_LMEM)