drm/i915: add for_each_port_masked macro

Same as for_each_dsi_port, but for general use. Leave the
for_each_dsi_port version around as an "alias" for now to not cause too
much churn. No functional changes.

Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/a0ef5bf33395e1fcd87178b17d6687b022042cf7.1458070700.git.jani.nikula@intel.com

drivers/gpu/drm/i915/i915_drv.h

@@ -274,6 +274,10 @@ struct i915_hotplug {
 	     (__s) < INTEL_INFO(__dev_priv)->num_sprites[(__p)];	\
 	     (__s)++)
 
+#define for_each_port_masked(__port, __ports_mask) \
+	for ((__port) = PORT_A; (__port) < I915_MAX_PORTS; (__port)++)	\
+		for_each_if ((__ports_mask) & (1 << (__port)))
+
 #define for_each_crtc(dev, crtc) \
 	list_for_each_entry(crtc, &dev->mode_config.crtc_list, head)
 

drivers/gpu/drm/i915/intel_dsi.h

@@ -119,9 +119,7 @@ static inline struct intel_dsi_host *to_intel_dsi_host(struct mipi_dsi_host *h)
 	return container_of(h, struct intel_dsi_host, base);
 }
 
-#define for_each_dsi_port(__port, __ports_mask) \
-	for ((__port) = PORT_A; (__port) < I915_MAX_PORTS; (__port)++)	\
-		for_each_if ((__ports_mask) & (1 << (__port)))
+#define for_each_dsi_port(__port, __ports_mask) for_each_port_masked(__port, __ports_mask)
 
 static inline struct intel_dsi *enc_to_intel_dsi(struct drm_encoder *encoder)
 {