[PATCH 14/16] drm/i915: Extract skl_plane_{wm,ddb}_reg_val()

[Ville Syrjala]

From: Ville Syrjälä <ville.syrj...@linux.intel.com>

Extract helpers to calculate the final wm/ddb register
values for skl+. Will allow me to more cleanly remove the
register write wrappers for these registers.

Signed-off-by: Ville Syrjälä <ville.syrj...@linux.intel.com>
---
 drivers/gpu/drm/i915/display/skl_watermark.c | 29 +++++++++++++-------
 1 file changed, 19 insertions(+), 10 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/skl_watermark.c 
b/drivers/gpu/drm/i915/display/skl_watermark.c
index 2a2073bf3aca..8a0a26ab8e6a 100644
--- a/drivers/gpu/drm/i915/display/skl_watermark.c
+++ b/drivers/gpu/drm/i915/display/skl_watermark.c
@@ -2365,21 +2365,23 @@ static int skl_build_pipe_wm(struct intel_atomic_state 
*state,
        return skl_wm_check_vblank(crtc_state);
 }
 
+static u32 skl_plane_ddb_reg_val(const struct skl_ddb_entry *entry)
+{
+       if (!entry->end)
+               return 0;
+
+       return PLANE_BUF_END(entry->end - 1) |
+               PLANE_BUF_START(entry->start);
+}
+
 static void skl_ddb_entry_write(struct drm_i915_private *i915,
                                i915_reg_t reg,
                                const struct skl_ddb_entry *entry)
 {
-       if (entry->end)
-               intel_de_write_fw(i915, reg,
-                                 PLANE_BUF_END(entry->end - 1) |
-                                 PLANE_BUF_START(entry->start));
-       else
-               intel_de_write_fw(i915, reg, 0);
+       intel_de_write_fw(i915, reg, skl_plane_ddb_reg_val(entry));
 }
 
-static void skl_write_wm_level(struct drm_i915_private *i915,
-                              i915_reg_t reg,
-                              const struct skl_wm_level *level)
+static u32 skl_plane_wm_reg_val(const struct skl_wm_level *level)
 {
        u32 val = 0;
 
@@ -2390,7 +2392,14 @@ static void skl_write_wm_level(struct drm_i915_private 
*i915,
        val |= REG_FIELD_PREP(PLANE_WM_BLOCKS_MASK, level->blocks);
        val |= REG_FIELD_PREP(PLANE_WM_LINES_MASK, level->lines);
 
-       intel_de_write_fw(i915, reg, val);
+       return val;
+}
+
+static void skl_write_wm_level(struct drm_i915_private *i915,
+                              i915_reg_t reg,
+                              const struct skl_wm_level *level)
+{
+       intel_de_write_fw(i915, reg, skl_plane_wm_reg_val(level));
 }
 
 void skl_write_plane_wm(struct intel_plane *plane,
-- 
2.43.2