From patchwork Wed Mar 20 07:39:26 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Christian A. Ehrhardt" X-Patchwork-Id: 13597427 Received: from cae.in-ulm.de (cae.in-ulm.de [217.10.14.231]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 6A8722C68A; Wed, 20 Mar 2024 07:40:18 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.10.14.231 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1710920421; cv=none; b=E7eRWAwDqGAxUWZBoJp5F+NXG5V6lUxhExWL+cLXSkXH5KOUc1Uk8xkDDicf+DxSsstZN9YbhO3wCzHX6jFt0YL5lQmjKV9j7lHWraIGEGicugOQsKMlHJM38+PnbZ2NKvXuwUZMLiOae9CQazXX7Z5FAOZ660tjAoH9LTB8Bdo= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1710920421; c=relaxed/simple; bh=W6IONZrbhxB3/AZDCuJHc0iTpJjN/te0qxiwSJPPhN0=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=ikNsCQc4CvGmi9ZRpERCZHIKejQ6KAdh1m0hRbTFTyztR+7hnnJHOhix3Ir06If27qzw5bRgbw8gdVzLhJBL1QHJ/0p2CsVimppfWbDALuNYk7suekWzW3BxjAdaM619q6doqj1QBrGQyOzSJ1LWC7XtSfeYjph5DOhppkUxxCM= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=c--e.de; spf=pass smtp.mailfrom=c--e.de; arc=none smtp.client-ip=217.10.14.231 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=c--e.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=c--e.de Received: by cae.in-ulm.de (Postfix, from userid 1000) id B12E8140935; Wed, 20 Mar 2024 08:40:16 +0100 (CET) From: "Christian A. Ehrhardt" To: linux-kernel@vger.kernel.org Cc: "Christian A. Ehrhardt" , Heikki Krogerus , Greg Kroah-Hartman , Prashant Malani , Jameson Thies , Abhishek Pandit-Subedi , Neil Armstrong , =?utf-8?q?Uwe_Kleine-K=C3=B6nig?= , =?utf-8?q?Samuel_=C4=8Cavoj?= , linux-usb@vger.kernel.org, Kenneth Crudup Subject: [PATCH 5/5] usb: typec: ucsi: Clear UCSI_CCI_RESET_COMPLETE before reset Date: Wed, 20 Mar 2024 08:39:26 +0100 Message-Id: <20240320073927.1641788-6-lk@c--e.de> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20240320073927.1641788-1-lk@c--e.de> References: <20240320073927.1641788-1-lk@c--e.de> Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Check the UCSI_CCI_RESET_COMPLETE complete flag before starting another reset. Use a UCSI_SET_NOTIFICATION_ENABLE command to clear the flag if it is set. Signed-off-by: Christian A. Ehrhardt Reviewed-by: Heikki Krogerus --- drivers/usb/typec/ucsi/ucsi.c | 36 ++++++++++++++++++++++++++++++++++- 1 file changed, 35 insertions(+), 1 deletion(-) diff --git a/drivers/usb/typec/ucsi/ucsi.c b/drivers/usb/typec/ucsi/ucsi.c index 63f340dbd867..85e507df7fa8 100644 --- a/drivers/usb/typec/ucsi/ucsi.c +++ b/drivers/usb/typec/ucsi/ucsi.c @@ -1264,13 +1264,47 @@ static int ucsi_reset_connector(struct ucsi_connector *con, bool hard) static int ucsi_reset_ppm(struct ucsi *ucsi) { - u64 command = UCSI_PPM_RESET; + u64 command; unsigned long tmo; u32 cci; int ret; mutex_lock(&ucsi->ppm_lock); + ret = ucsi->ops->read(ucsi, UCSI_CCI, &cci, sizeof(cci)); + if (ret < 0) + goto out; + + /* + * If UCSI_CCI_RESET_COMPLETE is already set we must clear + * the flag before we start another reset. Send a + * UCSI_SET_NOTIFICATION_ENABLE command to achieve this. + * Ignore a timeout and try the reset anyway if this fails. + */ + if (cci & UCSI_CCI_RESET_COMPLETE) { + command = UCSI_SET_NOTIFICATION_ENABLE; + ret = ucsi->ops->async_write(ucsi, UCSI_CONTROL, &command, + sizeof(command)); + if (ret < 0) + goto out; + + tmo = jiffies + msecs_to_jiffies(UCSI_TIMEOUT_MS); + do { + ret = ucsi->ops->read(ucsi, UCSI_CCI, + &cci, sizeof(cci)); + if (ret < 0) + goto out; + if (cci & UCSI_CCI_COMMAND_COMPLETE) + break; + if (time_is_before_jiffies(tmo)) + break; + msleep(20); + } while (1); + + WARN_ON(cci & UCSI_CCI_RESET_COMPLETE); + } + + command = UCSI_PPM_RESET; ret = ucsi->ops->async_write(ucsi, UCSI_CONTROL, &command, sizeof(command)); if (ret < 0)