From patchwork Mon Jul 18 05:09:10 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tzung-Bi Shih X-Patchwork-Id: 12920725 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9EBE7A47 for ; Mon, 18 Jul 2022 05:10:14 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8EE1AC341CA; Mon, 18 Jul 2022 05:10:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1658121014; bh=O6BmjsqSJ+Huo3HjurXfnhr+k1oxAIxru4gq3B0ygJw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=HlnGHh1dyoOsNJ8jabgwfEh5st3eqslRLD8gYT+5/gL0SUlD1/EdKaNNyGENcwsT2 iaIH8QXPRuz+38hfjVcjHTKdf5kcHzeaDc43brPoyE84v7FzCl84Nbv5zxj1Idm16b n/oqw8vhptjXEzgIkDX169v5nfdPeDyj2/9yBsqZ24d2l5cXXBwp+0mFpDdHo+codl iu32AxaeAqIds9sn6cAfGz4vOw84t0tOUQQswp0Ooc1wgimwLj9VwT51vchdamrxew h02z3FvDT+v3QuR89CiQre5tyFxLwO1Gw6AKdhafK/Xy5rvf8gYhLroAwu/Vt/N7uy SS1H/Q/UU/5uw== From: Tzung-Bi Shih To: bleung@chromium.org, groeck@chromium.org Cc: chrome-platform@lists.linux.dev, tzungbi@kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 06/10] platform/chrome: cros_ec_proto: separate cros_ec_wait_until_complete() Date: Mon, 18 Jul 2022 05:09:10 +0000 Message-Id: <20220718050914.2267370-7-tzungbi@kernel.org> X-Mailer: git-send-email 2.37.0.170.g444d1eabd0-goog In-Reply-To: <20220718050914.2267370-1-tzungbi@kernel.org> References: <20220718050914.2267370-1-tzungbi@kernel.org> Precedence: bulk X-Mailing-List: chrome-platform@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 EC returns EC_RES_IN_PROGRESS if the host command needs more time to complete. Whenever receives the return code, cros_ec_send_command() sends EC_CMD_GET_COMMS_STATUS to query the command status. Separate cros_ec_wait_until_complete() from cros_ec_send_command(). It sends EC_CMD_GET_COMMS_STATUS and waits until the previous command was completed, or encountered error, or timed out. Signed-off-by: Tzung-Bi Shih Reviewed-by: Guenter Roeck --- Changes from v1: - Allocate buffer in cros_ec_wait_until_complete() statically. - Use `return ret` instead of `break` to make the intent explicit. drivers/platform/chrome/cros_ec_proto.c | 74 ++++++++++++------------- 1 file changed, 35 insertions(+), 39 deletions(-) diff --git a/drivers/platform/chrome/cros_ec_proto.c b/drivers/platform/chrome/cros_ec_proto.c index 0cec013be3d3..a6ad7f7956e6 100644 --- a/drivers/platform/chrome/cros_ec_proto.c +++ b/drivers/platform/chrome/cros_ec_proto.c @@ -134,56 +134,52 @@ static int cros_ec_xfer_command(struct cros_ec_device *ec_dev, struct cros_ec_co return ret; } -static int cros_ec_send_command(struct cros_ec_device *ec_dev, struct cros_ec_command *msg) +static int cros_ec_wait_until_complete(struct cros_ec_device *ec_dev, uint32_t *result) { - int ret = cros_ec_xfer_command(ec_dev, msg); + struct { + struct cros_ec_command msg; + struct ec_response_get_comms_status status; + } __packed buf; + struct cros_ec_command *msg = &buf.msg; + struct ec_response_get_comms_status *status = &buf.status; + int ret = 0, i; - if (msg->result == EC_RES_IN_PROGRESS) { - int i; - struct cros_ec_command *status_msg; - struct ec_response_get_comms_status *status; + msg->version = 0; + msg->command = EC_CMD_GET_COMMS_STATUS; + msg->insize = sizeof(*status); + msg->outsize = 0; - status_msg = kmalloc(sizeof(*status_msg) + sizeof(*status), - GFP_KERNEL); - if (!status_msg) - return -ENOMEM; + /* Query the EC's status until it's no longer busy or we encounter an error. */ + for (i = 0; i < EC_COMMAND_RETRIES; ++i) { + usleep_range(10000, 11000); - status_msg->version = 0; - status_msg->command = EC_CMD_GET_COMMS_STATUS; - status_msg->insize = sizeof(*status); - status_msg->outsize = 0; + ret = cros_ec_xfer_command(ec_dev, msg); + if (ret == -EAGAIN) + continue; + if (ret < 0) + return ret; - /* - * Query the EC's status until it's no longer busy or - * we encounter an error. - */ - for (i = 0; i < EC_COMMAND_RETRIES; i++) { - usleep_range(10000, 11000); - - trace_cros_ec_request_start(status_msg); - ret = (*xfer_fxn)(ec_dev, status_msg); - trace_cros_ec_request_done(status_msg, ret); - if (ret == -EAGAIN) - continue; - if (ret < 0) - break; - - msg->result = status_msg->result; - if (status_msg->result != EC_RES_SUCCESS) - break; - - status = (struct ec_response_get_comms_status *) - status_msg->data; - if (!(status->flags & EC_COMMS_STATUS_PROCESSING)) - break; - } + *result = msg->result; + if (msg->result != EC_RES_SUCCESS) + return ret; - kfree(status_msg); + if (!(status->flags & EC_COMMS_STATUS_PROCESSING)) + return ret; } return ret; } +static int cros_ec_send_command(struct cros_ec_device *ec_dev, struct cros_ec_command *msg) +{ + int ret = cros_ec_xfer_command(ec_dev, msg); + + if (msg->result == EC_RES_IN_PROGRESS) + ret = cros_ec_wait_until_complete(ec_dev, &msg->result); + + return ret; +} + /** * cros_ec_prepare_tx() - Prepare an outgoing message in the output buffer. * @ec_dev: Device to register.