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[209.132.180.67]) by mx.google.com with ESMTP id g74-v6si18545984pfe.4.2018.10.09.10.57.55; Tue, 09 Oct 2018 10:58:11 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=pass header.i=@google.com header.s=20161025 header.b=ESEItExX; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=REJECT sp=REJECT dis=NONE) header.from=google.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727291AbeJJBPA (ORCPT + 99 others); Tue, 9 Oct 2018 21:15:00 -0400 Received: from mail-pg1-f201.google.com ([209.85.215.201]:52813 "EHLO mail-pg1-f201.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726607AbeJJBPA (ORCPT ); Tue, 9 Oct 2018 21:15:00 -0400 Received: by mail-pg1-f201.google.com with SMTP id m4-v6so1801744pgq.19 for ; Tue, 09 Oct 2018 10:56:50 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=date:message-id:mime-version:subject:from:to:cc; bh=jbUkitrzTYv5uI0nmsoLFGoQCfVIXTsBFswqlAMPmk0=; b=ESEItExX3CYE111LZz+1iU/IWNHsqdmbLRpgT59ZElvM+HBtdz0C66QHzoEDJmeUkR NMlTvQoF8/hp3t7IyONCZnGeQBUNO5t9ByEJyOfPKCqMoff39icpluiEFMERrBf17l+x Ks1FovuVxGnV7nZy1gjd9H50YXxYKNBFtPXPvXXI1aRQWLTcyoLG6TH4+ALATVWtMhWw rv4kMmWCNAHo+h6Hul7g/oPXtmA7pV8BBvuChJHVa2bsSNR4KmRVa7fyFA54TcVkhvQn x+gpzAhTycrlLQRrDhwXLzCVVQm7z+pad+b045T3yxnM3UFdmBeKLo8CQtepPjretkIj kKgQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:message-id:mime-version:subject:from:to:cc; bh=jbUkitrzTYv5uI0nmsoLFGoQCfVIXTsBFswqlAMPmk0=; b=b7Ox5dBVr7AmBW37RZULrUWCJinoEtCaGY8AVbIeW0UqkOQCcBrBNbMw0Ma1bt/a/l Ir66rtRa2wxIO/BMhe6NZsP1PWt3wL8z53OhXEI/BUY1V6gChYllzpB7v/HiMHyDEk4M 9vlM2oaTLtIe0a/Z/cmW8Oe+WiA/SHVNdS92N6cYzk/iwYNiNjodZukSidJ2gxDWVsru vIotgXMkGMbctSEKm0svisYEgMEc3scNnX9l+zXL3K0652SC+wCOWxDyxn3xBwZf7lF1 SgRGtgRzMQ6p02OsW50NmumGj/U0FDbnvDhZWdJwWAs6ptlNnC3BOfcWvD98Zpnbwv0C OKYg== X-Gm-Message-State: ABuFfohVvrsmdgWBePj9VrKZsIsxSNqVEBBgY0o40irEumRAYiYevWNa 7lMJDrJbzs8UuiG/MfD8aGXw5emPPpmZ6A== X-Received: by 2002:a63:84c1:: with SMTP id k184-v6mr11941756pgd.42.1539107810402; Tue, 09 Oct 2018 10:56:50 -0700 (PDT) Date: Tue, 9 Oct 2018 10:56:46 -0700 Message-Id: <20181009175646.39921-1-egranata@google.com> Mime-Version: 1.0 X-Mailer: git-send-email 2.19.0.605.g01d371f741-goog Subject: [PATCH v2] platform/chrome: Add a new interrupt path for cros_ec_lpc From: Enrico Granata To: Benson Leung , Olof Johansson , linux-kernel@vger.kernel.org, gwendal@google.com Cc: Enrico Granata Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Enrico Granata This commit allows cros_ec_lpc to register a direct IRQ instead of relying on the ACPI notification chain to receive MKBP events. This change is done in the interest of allowing reduced jitter in the communication path between the CrOS EC and the host for receiving sensor data. Signed-off-by: Enrico Granata --- drivers/platform/chrome/cros_ec_lpc.c | 15 ++++++++++++++- 1 file changed, 14 insertions(+), 1 deletion(-) diff --git a/drivers/platform/chrome/cros_ec_lpc.c b/drivers/platform/chrome/cros_ec_lpc.c index 31c8b8c49e45..20e97525b1a9 100644 --- a/drivers/platform/chrome/cros_ec_lpc.c +++ b/drivers/platform/chrome/cros_ec_lpc.c @@ -25,6 +25,7 @@ #include #include #include +#include #include #include #include @@ -248,7 +249,7 @@ static int cros_ec_lpc_probe(struct platform_device *pdev) acpi_status status; struct cros_ec_device *ec_dev; u8 buf[2]; - int ret; + int irq, ret; if (!devm_request_region(dev, EC_LPC_ADDR_MEMMAP, EC_MEMMAP_SIZE, dev_name(dev))) { @@ -287,6 +288,18 @@ static int cros_ec_lpc_probe(struct platform_device *pdev) sizeof(struct ec_response_get_protocol_info); ec_dev->dout_size = sizeof(struct ec_host_request); + /* + * Some boards do not have an IRQ allotted for cros_ec_lpc, + * which makes ENXIO an expected (and safe) scenario. + */ + irq = platform_get_irq(pdev, 0); + if (irq > 0) + ec_dev->irq = irq; + else if (irq != -ENXIO) { + dev_err(dev, "couldn't retrieve IRQ number (%d)\n", irq); + return irq; + } + ret = cros_ec_register(ec_dev); if (ret) { dev_err(dev, "couldn't register ec_dev (%d)\n", ret); -- 2.19.0.605.g01d371f741-goog