From c7e37cc6240767f794678d11704935d49cc81d59 Mon Sep 17 00:00:00 2001 From: Hans de Goede Date: Thu, 3 Nov 2022 11:31:43 -0700 Subject: 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 Reviewed-by: Bastien Nocera Link: https://lore.kernel.org/r/20221025122930.421377-2-hdegoede@redhat.com Signed-off-by: Dmitry Torokhov --- drivers/input/touchscreen/goodix.c | 11 +++++++++++ 1 file changed, 11 insertions(+) (limited to 'drivers/input/touchscreen') diff --git a/drivers/input/touchscreen/goodix.c b/drivers/input/touchscreen/goodix.c index a33cc7950cf5..c281e49826c2 100644 --- 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); -- cgit v1.2.3