6.1-stable review patch. If anyone has any objections, please let me know. ------------------ From: Christian A. Ehrhardt <lk@xxxxxxx> [ Upstream commit de52aca4d9d56c3b2f00b638d457075914b1a227 ] Some PPM implementation do not like UCSI_ACK_CONNECTOR_CHANGE without UCSI_ACK_COMMAND_COMPLETE. Moreover, doing this is racy as it requires sending two UCSI_ACK_CC_CI commands in a row and the second one will be started with UCSI_CCI_ACK_COMPLETE already set in CCI. Bundle the UCSI_ACK_CONNECTOR_CHANGE with the UCSI_ACK_COMMAND_COMPLETE for the UCSI_GET_CONNECTOR_STATUS command that is sent while handling a connector change event. Signed-off-by: Christian A. Ehrhardt <lk@xxxxxxx> Reviewed-by: Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx> Tested-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx> Link: https://lore.kernel.org/r/20240327224554.1772525-3-lk@xxxxxxx Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> Stable-dep-of: 8bdf8a42bca4 ("usb: typec: ucsi: Ack also failed Get Error commands") Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- drivers/usb/typec/ucsi/ucsi.c | 48 ++++++++++++++++++------------------------ 1 file changed, 21 insertions(+), 27 deletions(-) --- a/drivers/usb/typec/ucsi/ucsi.c +++ b/drivers/usb/typec/ucsi/ucsi.c @@ -36,22 +36,16 @@ */ #define UCSI_SWAP_TIMEOUT_MS 5000 -static int ucsi_acknowledge_command(struct ucsi *ucsi) +static int ucsi_acknowledge(struct ucsi *ucsi, bool conn_ack) { u64 ctrl; ctrl = UCSI_ACK_CC_CI; ctrl |= UCSI_ACK_COMMAND_COMPLETE; - - return ucsi->ops->sync_write(ucsi, UCSI_CONTROL, &ctrl, sizeof(ctrl)); -} - -static int ucsi_acknowledge_connector_change(struct ucsi *ucsi) -{ - u64 ctrl; - - ctrl = UCSI_ACK_CC_CI; - ctrl |= UCSI_ACK_CONNECTOR_CHANGE; + if (conn_ack) { + clear_bit(EVENT_PENDING, &ucsi->flags); + ctrl |= UCSI_ACK_CONNECTOR_CHANGE; + } return ucsi->ops->sync_write(ucsi, UCSI_CONTROL, &ctrl, sizeof(ctrl)); } @@ -64,7 +58,7 @@ static int ucsi_read_error(struct ucsi * int ret; /* Acknowledge the command that failed */ - ret = ucsi_acknowledge_command(ucsi); + ret = ucsi_acknowledge(ucsi, false); if (ret) return ret; @@ -76,7 +70,7 @@ static int ucsi_read_error(struct ucsi * if (ret) return ret; - ret = ucsi_acknowledge_command(ucsi); + ret = ucsi_acknowledge(ucsi, false); if (ret) return ret; @@ -139,7 +133,7 @@ static int ucsi_exec_command(struct ucsi return -EIO; if (cci & UCSI_CCI_NOT_SUPPORTED) { - if (ucsi_acknowledge_command(ucsi) < 0) + if (ucsi_acknowledge(ucsi, false) < 0) dev_err(ucsi->dev, "ACK of unsupported command failed\n"); return -EOPNOTSUPP; @@ -152,15 +146,15 @@ static int ucsi_exec_command(struct ucsi } if (cmd == UCSI_CANCEL && cci & UCSI_CCI_CANCEL_COMPLETE) { - ret = ucsi_acknowledge_command(ucsi); + ret = ucsi_acknowledge(ucsi, false); return ret ? ret : -EBUSY; } return UCSI_CCI_LENGTH(cci); } -int ucsi_send_command(struct ucsi *ucsi, u64 command, - void *data, size_t size) +static int ucsi_send_command_common(struct ucsi *ucsi, u64 command, + void *data, size_t size, bool conn_ack) { u8 length; int ret; @@ -179,7 +173,7 @@ int ucsi_send_command(struct ucsi *ucsi, goto out; } - ret = ucsi_acknowledge_command(ucsi); + ret = ucsi_acknowledge(ucsi, conn_ack); if (ret) goto out; @@ -188,6 +182,12 @@ out: mutex_unlock(&ucsi->ppm_lock); return ret; } + +int ucsi_send_command(struct ucsi *ucsi, u64 command, + void *data, size_t size) +{ + return ucsi_send_command_common(ucsi, command, data, size, false); +} EXPORT_SYMBOL_GPL(ucsi_send_command); /* -------------------------------------------------------------------------- */ @@ -785,7 +785,9 @@ static void ucsi_handle_connector_change mutex_lock(&con->lock); command = UCSI_GET_CONNECTOR_STATUS | UCSI_CONNECTOR_NUMBER(con->num); - ret = ucsi_send_command(ucsi, command, &con->status, sizeof(con->status)); + + ret = ucsi_send_command_common(ucsi, command, &con->status, + sizeof(con->status), true); if (ret < 0) { dev_err(ucsi->dev, "%s: GET_CONNECTOR_STATUS failed (%d)\n", __func__, ret); @@ -833,14 +835,6 @@ static void ucsi_handle_connector_change if (con->status.change & UCSI_CONSTAT_CAM_CHANGE) ucsi_partner_task(con, ucsi_check_altmodes, 1, 0); - mutex_lock(&ucsi->ppm_lock); - clear_bit(EVENT_PENDING, &con->ucsi->flags); - ret = ucsi_acknowledge_connector_change(ucsi); - mutex_unlock(&ucsi->ppm_lock); - - if (ret) - dev_err(ucsi->dev, "%s: ACK failed (%d)", __func__, ret); - out_unlock: mutex_unlock(&con->lock); }
