mirrors/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2024-08-21 08:19:28 +00:00
Code Issues Releases Wiki Activity

Merge branch 'for-6.5/goodix' into for-linus

Browse source 
- power management reset-during-suspend fix for goodix Chromebook
  devices (Fei Shao)
This commit is contained in:
Jiri Kosina 2023-06-27 22:41:03 +02:00
commit 278cc2f13d
2 changed files with 24 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

9
Documentation/devicetree/bindings/input/goodix,gt7375p.yaml
View file

@ -43,6 +43,15 @@ properties:
itself as long as it allows the main board to make signals compatible
with what the touchscreen is expecting for its IO rails.
goodix,no-reset-during-suspend:
description:
Set this to true to enforce the driver to not assert the reset GPIO
during suspend.
Due to potential touchscreen hardware flaw, back-powering could happen in
suspend if the power supply is on and with active-low reset GPIO asserted.
This property is used to avoid the back-powering issue.
type: boolean
required:
- compatible
- reg

16
drivers/hid/i2c-hid/i2c-hid-of-goodix.c
View file

@ -28,6 +28,7 @@ struct i2c_hid_of_goodix {
struct regulator *vdd;
struct regulator *vddio;
struct gpio_desc *reset_gpio;
bool no_reset_during_suspend;
const struct goodix_i2c_hid_timing_data *timings;
};
@ -37,6 +38,14 @@ static int goodix_i2c_hid_power_up(struct i2chid_ops *ops)
container_of(ops, struct i2c_hid_of_goodix, ops);
int ret;
/*
* We assert reset GPIO here (instead of during power-down) to ensure
* the device will have a clean state after powering up, just like the
* normal scenarios will have.
*/
if (ihid_goodix->no_reset_during_suspend)
gpiod_set_value_cansleep(ihid_goodix->reset_gpio, 1);
ret = regulator_enable(ihid_goodix->vdd);
if (ret)
return ret;
@ -60,7 +69,9 @@ static void goodix_i2c_hid_power_down(struct i2chid_ops *ops)
struct i2c_hid_of_goodix *ihid_goodix =
container_of(ops, struct i2c_hid_of_goodix, ops);
gpiod_set_value_cansleep(ihid_goodix->reset_gpio, 1);
if (!ihid_goodix->no_reset_during_suspend)
gpiod_set_value_cansleep(ihid_goodix->reset_gpio, 1);
regulator_disable(ihid_goodix->vddio);
regulator_disable(ihid_goodix->vdd);
}
@ -91,6 +102,9 @@ static int i2c_hid_of_goodix_probe(struct i2c_client *client)
if (IS_ERR(ihid_goodix->vddio))
return PTR_ERR(ihid_goodix->vddio);
ihid_goodix->no_reset_during_suspend =
of_property_read_bool(client->dev.of_node, "goodix,no-reset-during-suspend");
ihid_goodix->timings = device_get_match_data(&client->dev);
return i2c_hid_core_probe(client, &ihid_goodix->ops, 0x0001, 0);