From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.0 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_PASS,T_DKIMWL_WL_HIGH,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 36113C04A6B for ; Wed, 8 May 2019 21:38:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E4136216C4 for ; Wed, 8 May 2019 21:38:16 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b="Un1nVtZE" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728371AbfEHViQ (ORCPT ); Wed, 8 May 2019 17:38:16 -0400 Received: from mail-it1-f193.google.com ([209.85.166.193]:53965 "EHLO mail-it1-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726583AbfEHViP (ORCPT ); Wed, 8 May 2019 17:38:15 -0400 Received: by mail-it1-f193.google.com with SMTP id l10so91285iti.3 for ; Wed, 08 May 2019 14:38:14 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=DebiEN0gYND2+CEmsrKVBjMWuiWkJ2NgGu4iQ+zM7jc=; b=Un1nVtZEJTWsOBuq/BeFSYMGKb1w+hIjFzunFVU2/psJ96L7VeVGmEU8kDvqaXTgg1 WTSp2Tbtm9QH2k1uXk41f7M41SL+j/7yWyV9Jhk1fVLQGJmXDOaOyPq8epwqSVaLKMSH DG9/J/qOG8nsYdg3IssRfL510E6gA8TLhT9lA= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=DebiEN0gYND2+CEmsrKVBjMWuiWkJ2NgGu4iQ+zM7jc=; b=hbCSCP5vBTK/ongK2mqzIhWKLz5qlIX8sod38oZsmvXaUUw8H9m+UhlkIexA0yKTaT Ix7zkOzS/0f7oHhHZju8tbYEYX+j1I9pk+UAva6yXAmfAKTp2O/zycWwRJRKCBpwWOmb F7RM3MpBzrLKw6WdQtRQUB0Gkk/3lXolKlo7n6f3KnAEUrU8FGNWugaq+HvYNcntqOc2 mOp2j0lbm1uchU5E9oEYSB3MVCwNJGTFqhWBEfXRijL4iAvmWrw2aKcCamoD8o7JKrgn xXhI8tQgOvLeyZdXb6GqReiz3txXjdQXDFpSV1JnQTFgI9z4DWQygMjct+yilpqjJ+zR 3MsA== X-Gm-Message-State: APjAAAXgD5Mnj2nxIFtN/bMV+jlhjdIczWeh1mozqOCT8e5PgzTrzIa1 VqEuH4Tyl8DVtGdFqMWu4i4EfQ== X-Google-Smtp-Source: APXvYqwy5udOrXvBa10Ll5+Pi9bIMHroHsy92mXrU3tK20IV0DRCkw6R1C0Q1vXkNBNLKiMSmn5z3w== X-Received: by 2002:a24:51:: with SMTP id 78mr122584ita.20.1557351494502; Wed, 08 May 2019 14:38:14 -0700 (PDT) Received: from ncrews2.bld.corp.google.com ([2620:15c:183:200:cb43:2cd4:65f5:5c84]) by smtp.gmail.com with ESMTPSA id m206sm114145ioa.85.2019.05.08.14.38.13 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Wed, 08 May 2019 14:38:13 -0700 (PDT) From: Nick Crews To: enric.balletbo@collabora.com, bleung@chromium.org Cc: linux-kernel@vger.kernel.org, dlaurie@chromium.org, derat@google.com, dtor@google.com, sjg@chromium.org, bartfab@chromium.org, lamzin@google.com, jchwong@google.com, Nick Crews Subject: [PATCH v4 1/2] platform/chrome: wilco_ec: Remove 256 byte transfers Date: Wed, 8 May 2019 15:38:09 -0600 Message-Id: <20190508213810.123200-1-ncrews@chromium.org> X-Mailer: git-send-email 2.20.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The 0xF6 command, intended to send and receive 256 byte payloads to and from the EC, is not needed. The 0xF5 command for 32 byte payloads is sufficient. This patch removes support for the 0xF6 command and 256 byte payloads. Signed-off-by: Nick Crews --- v4 changes: - Fix debug format string to use %u instead of %zu since type of EC_MAILBOX_DATA_SIZE has changed. Documentation/ABI/testing/debugfs-wilco-ec | 16 +++++++--------- drivers/platform/chrome/wilco_ec/core.c | 4 +--- drivers/platform/chrome/wilco_ec/debugfs.c | 10 ++-------- drivers/platform/chrome/wilco_ec/mailbox.c | 21 +++++---------------- include/linux/platform_data/wilco-ec.h | 9 ++------- 5 files changed, 17 insertions(+), 43 deletions(-) diff --git a/Documentation/ABI/testing/debugfs-wilco-ec b/Documentation/ABI/testing/debugfs-wilco-ec index 73a5a66ddca6..9d8d9d2def5b 100644 --- a/Documentation/ABI/testing/debugfs-wilco-ec +++ b/Documentation/ABI/testing/debugfs-wilco-ec @@ -23,11 +23,9 @@ Description: For writing, bytes 0-1 indicate the message type, one of enum wilco_ec_msg_type. Byte 2+ consist of the data passed in the - request, starting at MBOX[0] - - At least three bytes are required for writing, two for the type - and at least a single byte of data. Only the first - EC_MAILBOX_DATA_SIZE bytes of MBOX will be used. + request, starting at MBOX[0]. At least three bytes are required + for writing, two for the type and at least a single byte of + data. Example: // Request EC info type 3 (EC firmware build date) @@ -40,7 +38,7 @@ Description: $ cat /sys/kernel/debug/wilco_ec/raw 00 00 31 32 2f 32 31 2f 31 38 00 38 00 01 00 2f 00 ..12/21/18.8... - Note that the first 32 bytes of the received MBOX[] will be - printed, even if some of the data is junk. It is up to you to - know how many of the first bytes of data are the actual - response. + Note that the first 16 bytes of the received MBOX[] will be + printed, even if some of the data is junk, and skipping bytes + 17 to 32. It is up to you to know how many of the first bytes of + data are the actual response. diff --git a/drivers/platform/chrome/wilco_ec/core.c b/drivers/platform/chrome/wilco_ec/core.c index 05e1e2be1c91..d060d3aa5bae 100644 --- a/drivers/platform/chrome/wilco_ec/core.c +++ b/drivers/platform/chrome/wilco_ec/core.c @@ -52,9 +52,7 @@ static int wilco_ec_probe(struct platform_device *pdev) ec->dev = dev; mutex_init(&ec->mailbox_lock); - /* Largest data buffer size requirement is extended data response */ - ec->data_size = sizeof(struct wilco_ec_response) + - EC_MAILBOX_DATA_SIZE_EXTENDED; + ec->data_size = sizeof(struct wilco_ec_response) + EC_MAILBOX_DATA_SIZE; ec->data_buffer = devm_kzalloc(dev, ec->data_size, GFP_KERNEL); if (!ec->data_buffer) return -ENOMEM; diff --git a/drivers/platform/chrome/wilco_ec/debugfs.c b/drivers/platform/chrome/wilco_ec/debugfs.c index f163476d080d..281ec595e8e0 100644 --- a/drivers/platform/chrome/wilco_ec/debugfs.c +++ b/drivers/platform/chrome/wilco_ec/debugfs.c @@ -17,13 +17,13 @@ #define DRV_NAME "wilco-ec-debugfs" /* The 256 raw bytes will take up more space when represented as a hex string */ -#define FORMATTED_BUFFER_SIZE (EC_MAILBOX_DATA_SIZE_EXTENDED * 4) +#define FORMATTED_BUFFER_SIZE (EC_MAILBOX_DATA_SIZE * 4) struct wilco_ec_debugfs { struct wilco_ec_device *ec; struct dentry *dir; size_t response_size; - u8 raw_data[EC_MAILBOX_DATA_SIZE_EXTENDED]; + u8 raw_data[EC_MAILBOX_DATA_SIZE]; u8 formatted_data[FORMATTED_BUFFER_SIZE]; }; static struct wilco_ec_debugfs *debug_info; @@ -124,12 +124,6 @@ static ssize_t raw_write(struct file *file, const char __user *user_buf, msg.response_data = debug_info->raw_data; msg.response_size = EC_MAILBOX_DATA_SIZE; - /* Telemetry commands use extended response data */ - if (msg.type == WILCO_EC_MSG_TELEMETRY_LONG) { - msg.flags |= WILCO_EC_FLAG_EXTENDED_DATA; - msg.response_size = EC_MAILBOX_DATA_SIZE_EXTENDED; - } - ret = wilco_ec_mailbox(debug_info->ec, &msg); if (ret < 0) return ret; diff --git a/drivers/platform/chrome/wilco_ec/mailbox.c b/drivers/platform/chrome/wilco_ec/mailbox.c index 7fb58b487963..ced1f9f3dcee 100644 --- a/drivers/platform/chrome/wilco_ec/mailbox.c +++ b/drivers/platform/chrome/wilco_ec/mailbox.c @@ -119,7 +119,6 @@ static int wilco_ec_transfer(struct wilco_ec_device *ec, struct wilco_ec_response *rs; u8 checksum; u8 flag; - size_t size; /* Write request header, then data */ cros_ec_lpc_io_bytes_mec(MEC_IO_WRITE, 0, sizeof(*rq), (u8 *)rq); @@ -148,21 +147,11 @@ static int wilco_ec_transfer(struct wilco_ec_device *ec, return -EIO; } - /* - * The EC always returns either EC_MAILBOX_DATA_SIZE or - * EC_MAILBOX_DATA_SIZE_EXTENDED bytes of data, so we need to - * calculate the checksum on **all** of this data, even if we - * won't use all of it. - */ - if (msg->flags & WILCO_EC_FLAG_EXTENDED_DATA) - size = EC_MAILBOX_DATA_SIZE_EXTENDED; - else - size = EC_MAILBOX_DATA_SIZE; - /* Read back response */ rs = ec->data_buffer; checksum = cros_ec_lpc_io_bytes_mec(MEC_IO_READ, 0, - sizeof(*rs) + size, (u8 *)rs); + sizeof(*rs) + EC_MAILBOX_DATA_SIZE, + (u8 *)rs); if (checksum) { dev_dbg(ec->dev, "bad packet checksum 0x%02x\n", rs->checksum); return -EBADMSG; @@ -173,9 +162,9 @@ static int wilco_ec_transfer(struct wilco_ec_device *ec, return -EBADMSG; } - if (rs->data_size != size) { - dev_dbg(ec->dev, "unexpected packet size (%u != %zu)", - rs->data_size, size); + if (rs->data_size != EC_MAILBOX_DATA_SIZE) { + dev_dbg(ec->dev, "unexpected packet size (%u != %u)", + rs->data_size, EC_MAILBOX_DATA_SIZE); return -EMSGSIZE; } diff --git a/include/linux/platform_data/wilco-ec.h b/include/linux/platform_data/wilco-ec.h index 50a21bd5fd44..33f137078737 100644 --- a/include/linux/platform_data/wilco-ec.h +++ b/include/linux/platform_data/wilco-ec.h @@ -13,12 +13,9 @@ /* Message flags for using the mailbox() interface */ #define WILCO_EC_FLAG_NO_RESPONSE BIT(0) /* EC does not respond */ -#define WILCO_EC_FLAG_EXTENDED_DATA BIT(1) /* EC returns 256 data bytes */ /* Normal commands have a maximum 32 bytes of data */ #define EC_MAILBOX_DATA_SIZE 32 -/* Extended commands have 256 bytes of response data */ -#define EC_MAILBOX_DATA_SIZE_EXTENDED 256 /** * struct wilco_ec_device - Wilco Embedded Controller handle. @@ -85,14 +82,12 @@ struct wilco_ec_response { * enum wilco_ec_msg_type - Message type to select a set of command codes. * @WILCO_EC_MSG_LEGACY: Legacy EC messages for standard EC behavior. * @WILCO_EC_MSG_PROPERTY: Get/Set/Sync EC controlled NVRAM property. - * @WILCO_EC_MSG_TELEMETRY_SHORT: 32 bytes of telemetry data provided by the EC. - * @WILCO_EC_MSG_TELEMETRY_LONG: 256 bytes of telemetry data provided by the EC. + * @WILCO_EC_MSG_TELEMETRY: Request telemetry data from the EC. */ enum wilco_ec_msg_type { WILCO_EC_MSG_LEGACY = 0x00f0, WILCO_EC_MSG_PROPERTY = 0x00f2, - WILCO_EC_MSG_TELEMETRY_SHORT = 0x00f5, - WILCO_EC_MSG_TELEMETRY_LONG = 0x00f6, + WILCO_EC_MSG_TELEMETRY = 0x00f5, }; /** -- 2.20.1