Input: ti_am335x_tsc - lower the X and Y sampling time

The open delay time has to be applied only on the first sample of the
X/Y coordinates because on the following samples the ADC channel is not
changed. Removing this time from the samples after the first one,
"ti,coordinate-readouts" greater than 1, decreases the total acquisition
time, allowing to increase the number of acquired coordinates in the time
unit.

Signed-off-by: Dario Binacchi <dariobin@libero.it>
Link: https://lore.kernel.org/r/20211212125358.14416-4-dariobin@libero.it
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

diff --git a/drivers/input/touchscreen/ti_am335x_tsc.c b/drivers/input/touchscreen/ti_am335x_tsc.c
index cfc9434..f4ef218 100644 (file)
--- a/drivers/input/touchscreen/ti_am335x_tsc.c
+++ b/drivers/input/touchscreen/ti_am335x_tsc.c
@@ -126,7 +126,7 @@ static int titsc_config_wires(struct titsc *ts_dev)
 static void titsc_step_config(struct titsc *ts_dev)
 {
        unsigned int    config;
-       int i;
+       int i, n;
        int end_step, first_step, tsc_steps;
        u32 stepenable;
 
@@ -151,9 +151,11 @@ static void titsc_step_config(struct titsc *ts_dev)
        first_step = TOTAL_STEPS - tsc_steps;
        /* Steps 16 to 16-coordinate_readouts is for X */
        end_step = first_step + tsc_steps;
+       n = 0;
        for (i = end_step - ts_dev->coordinate_readouts; i < end_step; i++) {
                titsc_writel(ts_dev, REG_STEPCONFIG(i), config);
-               titsc_writel(ts_dev, REG_STEPDELAY(i), STEPCONFIG_OPENDLY);
+               titsc_writel(ts_dev, REG_STEPDELAY(i),
+                            n++ == 0 ? STEPCONFIG_OPENDLY : 0);
        }
 
        config = 0;
@@ -175,9 +177,11 @@ static void titsc_step_config(struct titsc *ts_dev)
 
        /* 1 ... coordinate_readouts is for Y */
        end_step = first_step + ts_dev->coordinate_readouts;
+       n = 0;
        for (i = first_step; i < end_step; i++) {
                titsc_writel(ts_dev, REG_STEPCONFIG(i), config);
-               titsc_writel(ts_dev, REG_STEPDELAY(i), STEPCONFIG_OPENDLY);
+               titsc_writel(ts_dev, REG_STEPDELAY(i),
+                            n++ == 0 ? STEPCONFIG_OPENDLY : 0);
        }
 
        /* Make CHARGECONFIG same as IDLECONFIG */