Input: synaptics-rmi4 - switch to reduced reporting mode

When the distance thresholds are set the controller must be in reduced
reporting mode for them to have any effect on the interrupt generation.
This has a potentially large impact on the number of events the host
needs to process.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Reviewed-by: Andrew Duggan <aduggan@synaptics.com>
Link: https://lore.kernel.org/r/20200120111628.18376-1-l.stach@pengutronix.de
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

drivers/input/rmi4/rmi_f11.c

@@ -412,6 +412,10 @@ struct f11_2d_sensor_queries {
 
 /* Defs for Ctrl0. */
 #define RMI_F11_REPORT_MODE_MASK        0x07
+#define RMI_F11_REPORT_MODE_CONTINUOUS  (0 << 0)
+#define RMI_F11_REPORT_MODE_REDUCED     (1 << 0)
+#define RMI_F11_REPORT_MODE_FS_CHANGE   (2 << 0)
+#define RMI_F11_REPORT_MODE_FP_CHANGE   (3 << 0)
 #define RMI_F11_ABS_POS_FILT            (1 << 3)
 #define RMI_F11_REL_POS_FILT            (1 << 4)
 #define RMI_F11_REL_BALLISTICS          (1 << 5)
@@ -1195,6 +1199,16 @@ static int rmi_f11_initialize(struct rmi_function *fn)
 		ctrl->ctrl0_11[RMI_F11_DELTA_Y_THRESHOLD] =
 			sensor->axis_align.delta_y_threshold;
 
+	/*
+	 * If distance threshold values are set, switch to reduced reporting
+	 * mode so they actually get used by the controller.
+	 */
+	if (ctrl->ctrl0_11[RMI_F11_DELTA_X_THRESHOLD] ||
+	    ctrl->ctrl0_11[RMI_F11_DELTA_Y_THRESHOLD]) {
+		ctrl->ctrl0_11[0] &= ~RMI_F11_REPORT_MODE_MASK;
+		ctrl->ctrl0_11[0] |= RMI_F11_REPORT_MODE_REDUCED;
+	}
+
 	if (f11->sens_query.has_dribble) {
 		switch (sensor->dribble) {
 		case RMI_REG_STATE_OFF: