diff mbox series

[v2,11/11] Input: goodix - Restore config on resume if necessary

Message ID 20200305220132.228722-11-hdegoede@redhat.com (mailing list archive)
State Superseded
Headers show
Series [v2,01/11] Input: goodix - Refactor IRQ pin GPIO accesses | expand

Commit Message

Hans de Goede March 5, 2020, 10:01 p.m. UTC 
Some devices, e.g the Trekstor Primetab S11B, lose there config over
a suspend/resume cycle (likely the controller loses power during suspend).

This commit reads back the config version on resume and if matches the
expected config version it resets the controller and resends the config
we read back and saved at probe time.

BugLink: https://bugzilla.redhat.com/show_bug.cgi?id=1786317
BugLink: https://github.com/nexus511/gpd-ubuntu-packages/issues/10
BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=199207
Cc: Dmitry Mastykin <mastichi@gmail.com>
Reviewed-by: Bastien Nocera <hadess@hadess.net>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
Changes in v2:
- Replace dev_warn on version mismatch on resume with dev_info
---
 drivers/input/touchscreen/goodix.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)
diff mbox series

Patch

diff --git a/drivers/input/touchscreen/goodix.c b/drivers/input/touchscreen/goodix.c
index 79dc4a0ad1a0..b37ea068c918 100644
--- a/drivers/input/touchscreen/goodix.c
+++ b/drivers/input/touchscreen/goodix.c
@@ -1246,6 +1246,7 @@  static int __maybe_unused goodix_resume(struct device *dev)
 {
 	struct i2c_client *client = to_i2c_client(dev);
 	struct goodix_ts_data *ts = i2c_get_clientdata(client);
+	u8 config_ver;
 	int error;
 
 	if (ts->irq_pin_access_method == IRQ_PIN_ACCESS_NONE) {
@@ -1267,6 +1268,27 @@  static int __maybe_unused goodix_resume(struct device *dev)
 	if (error)
 		return error;
 
+	error = goodix_i2c_read(ts->client, ts->chip->config_addr,
+				&config_ver, 1);
+	if (error)
+		dev_warn(dev, "Error reading config version: %d, resetting controller\n",
+			 error);
+	else if (config_ver != ts->config[0])
+		dev_info(dev, "Config version mismatch %d != %d, resetting controller\n",
+			 config_ver, ts->config[0]);
+
+	if (error != 0 || config_ver != ts->config[0]) {
+		error = goodix_reset(ts);
+		if (error) {
+			dev_err(dev, "Controller reset failed.\n");
+			return error;
+		}
+
+		error = goodix_send_cfg(ts, ts->config, ts->chip->config_len);
+		if (error)
+			return error;
+	}
+
 	error = goodix_request_irq(ts);
 	if (error)
 		return error;