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usb: typec: tcpci_husb311: tcpm reset when resume with dp alt mode

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For some Type-C to DP Adapter, It need reset tcpm state when resume
To avoid some thing wrong with display appear.

Change-Id: Ie23d62ded05cdbc438cd354c5b886ddc45210b42
Signed-off-by: Zhang Yubing <yubing.zhang@rock-chips.com>
This commit is contained in:
Zhang Yubing
2024-12-10 16:33:42 +08:00
committed by Tao Huang
parent 684040993b
commit 35fa27dbcf
1 changed files with 40 additions and 1 deletions
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41
drivers/usb/typec/tcpm/tcpci_husb311.c
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@@ -344,6 +344,45 @@ static int husb311_pm_suspend(struct device *dev)
return 0;
}
static int match_fwnode(struct device *dev, void *data)
{
return dev_fwnode(dev) == data;
}
static bool is_partner_altmode_device_registered(struct device *dev)
{
struct device *port, *partner, *altmode;
struct fwnode_handle *fwnode;
char device_name[20];
/* get typec port device */
fwnode = device_get_named_child_node(dev, "connector");
if (!fwnode)
return false;
port = device_find_child(dev, fwnode, match_fwnode);
fwnode_handle_put(fwnode);
if (!port)
return false;
/* get the partner device */
snprintf(device_name, sizeof(device_name), "%s-partner", dev_name(port));
partner = device_find_child_by_name(port, device_name);
put_device(port);
if (!partner)
return false;
/* get the altmode device, now only dp register */
snprintf(device_name, sizeof(device_name), "%s.0", dev_name(partner));
altmode = device_find_child_by_name(partner, device_name);
put_device(partner);
if (!altmode)
return false;
put_device(altmode);
return true;
}
static int husb311_pm_resume(struct device *dev)
{
struct husb311_chip *chip = dev->driver_data;
@@ -365,7 +404,7 @@ static int husb311_pm_resume(struct device *dev)
* husb311 powered off in suspend, the value would reset to default.
*/
ret = husb311_read8(chip, HUSB311_TCPC_FILTER, &filter);
if (filter != 0x0F || ret < 0) {
if (filter != 0x0F || ret < 0 || is_partner_altmode_device_registered(dev)) {
ret = husb311_sw_reset(chip);
if (ret < 0) {
dev_err(chip->dev, "fail to soft reset, ret = %d\n", ret);