drm/i915/cdclk: abstract intel_cdclk_bw_min_cdclk()

Add intel_cdclk_bw_min_cdclk() helper to avoid looking at struct
intel_cdclk_state internals outside of intel_cdclk.c.

Reviewed-by: Imre Deak <imre.deak@intel.com>
Link: https://lore.kernel.org/r/d07499174ebe55fa8fb98d4cb5ff541b6f5ec95b.1750847509.git.jani.nikula@intel.com
Signed-off-by: Jani Nikula <jani.nikula@intel.com>

Author: jnikula

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

@@ -1468,12 +1468,12 @@ int intel_bw_calc_min_cdclk(struct intel_atomic_state *state,
 	 * requirements. This can reduce back and forth
 	 * display blinking due to constant cdclk changes.
 	 */
-	if (new_min_cdclk <= cdclk_state->bw_min_cdclk)
+	if (new_min_cdclk <= intel_cdclk_bw_min_cdclk(cdclk_state))
 		return 0;
 
 	drm_dbg_kms(display->drm,
 		    "new bandwidth min cdclk (%d kHz) > old min cdclk (%d kHz)\n",
-		    new_min_cdclk, cdclk_state->bw_min_cdclk);
+		    new_min_cdclk, intel_cdclk_bw_min_cdclk(cdclk_state));
 	*need_cdclk_calc = true;
 
 	return 0;

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

@@ -3844,3 +3844,8 @@ int intel_cdclk_min_cdclk(const struct intel_cdclk_state *cdclk_state, enum pipe
 {
 	return cdclk_state->min_cdclk[pipe];
 }
+
+int intel_cdclk_bw_min_cdclk(const struct intel_cdclk_state *cdclk_state)
+{
+	return cdclk_state->bw_min_cdclk;
+}

drivers/gpu/drm/i915/display/intel_cdclk.h

@@ -99,5 +99,6 @@ void intel_cdclk_debugfs_register(struct intel_display *display);
 
 int intel_cdclk_logical(const struct intel_cdclk_state *cdclk_state);
 int intel_cdclk_min_cdclk(const struct intel_cdclk_state *cdclk_state, enum pipe pipe);
+int intel_cdclk_bw_min_cdclk(const struct intel_cdclk_state *cdclk_state);
 
 #endif /* __INTEL_CDCLK_H__ */