drm: Add workaround to support under-display fingerprint

Since under-dispaly fingerprint also use DSPP to adjust brightness in HBM mode for better fingerprint camera photo quality, we need to adjust exposure after fingerprint unlock. Signed-off-by: DevriesL <[email protected]>
Eventide · Dec 31, 2018 · f39f62c · f39f62c
1 parent 1414c7b
commit f39f62c
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diff --git a/drivers/gpu/drm/msm/dsi-staging/exposure_adjustment.c b/drivers/gpu/drm/msm/dsi-staging/exposure_adjustment.c
@@ -137,3 +137,36 @@ u32 ea_panel_calc_backlight(u32 bl_lvl)
 		return bl_lvl;
 	}
 }
+
+#ifdef EA_UDFP_WORKAROUND
+static struct delayed_work restore_backlight_work;
+
+static void restore_backlight(struct work_struct *work)
+{
+	pr_info("Resture backlight to %d\n", last_level);
+	ea_panel_calc_backlight(last_level);
+}
+
+void ea_panel_udfp_workaround(void)
+{
+	cancel_delayed_work_sync(&restore_backlight_work);
+	if (pcc_backlight_enable)
+		schedule_delayed_work(&restore_backlight_work, msecs_to_jiffies(EA_UDFP_UNLOCK_DELAY));
+}
+
+static int __init ea_panel_init(void)
+{
+	INIT_DELAYED_WORK(&restore_backlight_work, restore_backlight);
+
+	return 0;
+}
+
+static void __exit ea_panel_exit(void)
+{
+	return;
+}
+
+module_init(ea_panel_init);
+module_exit(ea_panel_exit);
+
+#endif
diff --git a/drivers/gpu/drm/msm/dsi-staging/exposure_adjustment.h b/drivers/gpu/drm/msm/dsi-staging/exposure_adjustment.h
@@ -26,6 +26,8 @@
  * @ELVSS_OFF_THRESHOLD: Minimum backlight threshold for disable smart elvss
  * @EXPOSURE_ADJUSTMENT_MIN: Minimum available PCC coefficient for OLED panel
  */
+#define EA_UDFP_WORKAROUND
+#define EA_UDFP_UNLOCK_DELAY       100
 #define ELVSS_OFF_THRESHOLD        258
 #define EXPOSURE_ADJUSTMENT_MIN    5200
 
@@ -37,4 +39,7 @@
 
 void ea_panel_mode_ctrl(struct dsi_panel *panel, bool enable);
 u32 ea_panel_calc_backlight(u32 bl_lvl);
+#ifdef EA_UDFP_WORKAROUND
+void ea_panel_udfp_workaround(void);
+#endif
 #endif /* EXPOSURE_ADJUSTMENT_H */