disp: msm: restrict AVR_STEP based on panel requirement

Some panels require a fixed step rate for a particular mode.
This change allows DSI panels to specify a single supported
step rate for each nominal fps rate which SDE will enforce
during atomic check of AVR parameters.

Change-Id: I049415449bc88ccd396fced16d4534251eac3a06
Signed-off-by: Steve Cohen <cohens@codeaurora.org>

msm/dsi/dsi_panel.h

@@ -95,6 +95,11 @@ struct dsi_qsync_capabilities {
 	int qsync_min_fps_list_len;
 };
 
+struct dsi_avr_capabilities {
+	u32 *avr_step_fps_list;
+	u32 avr_step_fps_list_len;
+};
+
 struct dsi_dyn_clk_caps {
 	bool dyn_clk_support;
 	enum dsi_dyn_clk_feature_type type;
@@ -247,6 +252,7 @@ struct dsi_panel {
 	bool panel_initialized;
 	bool te_using_watchdog_timer;
 	struct dsi_qsync_capabilities qsync_caps;
+	struct dsi_avr_capabilities avr_caps;
 
 	char dce_pps_cmd[DSI_CMD_PPS_SIZE];
 	enum dsi_dms_mode dms_mode;