Input: goodix - try resetting the controller when no config is set

On ACPI systems (irq_pin_access_method == IRQ_PIN_ACCESS_ACPI_*) the driver
does not reset the controller at probe time, because sometimes the system
firmware loads a config and resetting might loose this config.

On the Nanote UMPC-01 device OTOH the config is in flash of the controller,
the controller needs a reset to load this; and the system firmware does not
reset the controller on a cold boot.

To fix the Nanote UMPC-01 touchscreen not working on a cold boot, try
resetting the controller and then re-reading the config when encountering
a config with 0 width/height/max_touch_num value and the controller has
not already been reset by goodix_ts_probe().

This should be safe to do in general because normally we should never
encounter a config with 0 width/height/max_touch_num. Doing this in
general not only avoids the need for a DMI quirk, but also might help
other systems.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Bastien Nocera <hadess@hadess.net>
Link: https://lore.kernel.org/r/20221025122930.421377-2-hdegoede@redhat.com
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

diff --git a/drivers/input/touchscreen/goodix.c b/drivers/input/touchscreen/goodix.c
index a33cc79..c281e49 100644 (file)
--- a/drivers/input/touchscreen/goodix.c
+++ b/drivers/input/touchscreen/goodix.c
@@ -1158,6 +1158,7 @@ static int goodix_configure_dev(struct goodix_ts_data *ts)
        input_set_abs_params(ts->input_dev, ABS_MT_WIDTH_MAJOR, 0, 255, 0, 0);
        input_set_abs_params(ts->input_dev, ABS_MT_TOUCH_MAJOR, 0, 255, 0, 0);
 
+retry_read_config:
        /* Read configuration and apply touchscreen parameters */
        goodix_read_config(ts);
 
@@ -1165,6 +1166,16 @@ static int goodix_configure_dev(struct goodix_ts_data *ts)
        touchscreen_parse_properties(ts->input_dev, true, &ts->prop);
 
        if (!ts->prop.max_x || !ts->prop.max_y || !ts->max_touch_num) {
+               if (!ts->reset_controller_at_probe &&
+                   ts->irq_pin_access_method != IRQ_PIN_ACCESS_NONE) {
+                       dev_info(&ts->client->dev, "Config not set, resetting controller\n");
+                       /* Retry after a controller reset */
+                       ts->reset_controller_at_probe = true;
+                       error = goodix_reset(ts);
+                       if (error)
+                               return error;
+                       goto retry_read_config;
+               }
                dev_err(&ts->client->dev,
                        "Invalid config (%d, %d, %d), using defaults\n",
                        ts->prop.max_x, ts->prop.max_y, ts->max_touch_num);