From patchwork Wed Sep 30 14:20:13 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andy Shevchenko X-Patchwork-Id: 285654 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=-13.0 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 93A11C47420 for ; Wed, 30 Sep 2020 14:20:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 54D9F2085B for ; Wed, 30 Sep 2020 14:20:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730198AbgI3OUR (ORCPT ); Wed, 30 Sep 2020 10:20:17 -0400 Received: from mga18.intel.com ([134.134.136.126]:48773 "EHLO mga18.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730483AbgI3OUQ (ORCPT ); Wed, 30 Sep 2020 10:20:16 -0400 IronPort-SDR: lfpVfMQmhbkqWhOx4KRG5fhqp/R2sycZyUnGvRzuRAG4F/g+Rxs81y3h6eWdB6m047yGVKgcaC /6HArlR7UrLQ== X-IronPort-AV: E=McAfee;i="6000,8403,9759"; a="150241082" X-IronPort-AV: E=Sophos;i="5.77,322,1596524400"; d="scan'208";a="150241082" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga008.jf.intel.com ([10.7.209.65]) by orsmga106.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 30 Sep 2020 07:20:15 -0700 IronPort-SDR: R1YHU71BcWzjk83saH5O/LvD+vJR3zKkKmk5X9LC/jy9/Bdj+zZqlsfnwA1O9QGCykyPQBjmKt sTdLbCrW29yQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.77,322,1596524400"; d="scan'208";a="341216154" Received: from black.fi.intel.com ([10.237.72.28]) by orsmga008.jf.intel.com with ESMTP; 30 Sep 2020 07:20:14 -0700 Received: by black.fi.intel.com (Postfix, from userid 1003) id CF9DF92; Wed, 30 Sep 2020 17:20:13 +0300 (EEST) From: Andy Shevchenko To: Linus Walleij , linux-gpio@vger.kernel.org, Bartosz Golaszewski Cc: Andy Shevchenko Subject: [PATCH v1 2/2] gpio: pca953x: Correctly initialize registers 6 and 7 for PCA957x Date: Wed, 30 Sep 2020 17:20:13 +0300 Message-Id: <20200930142013.59247-2-andriy.shevchenko@linux.intel.com> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200930142013.59247-1-andriy.shevchenko@linux.intel.com> References: <20200930142013.59247-1-andriy.shevchenko@linux.intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org When driver has been converted to the bitmap API the non-bitmap functions started behaving differently on 32-bit BE architectures since the bytes in two consequent unsigned longs are in different order in comparison to byte array. Hence if the chip had had more than 32 lines the memset() call over it would have not set up upper lines correctly. Although it's currently a theoretical case (no supported chips of this type has 32+ lines), it's better to provide a clean code to avoid people thinking this is okay and potentially producing not fully working things. Fixes: 35d13d94893f ("gpio: pca953x: convert to use bitmap API") Signed-off-by: Andy Shevchenko Reviewed-by: Bartosz Golaszewski --- drivers/gpio/gpio-pca953x.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/gpio/gpio-pca953x.c b/drivers/gpio/gpio-pca953x.c index 3f24cfabb1d7..6263a4d55f8b 100644 --- a/drivers/gpio/gpio-pca953x.c +++ b/drivers/gpio/gpio-pca953x.c @@ -942,6 +942,7 @@ static int device_pca95xx_init(struct pca953x_chip *chip, u32 invert) static int device_pca957x_init(struct pca953x_chip *chip, u32 invert) { DECLARE_BITMAP(val, MAX_LINE); + unsigned int i; int ret; ret = device_pca95xx_init(chip, invert); @@ -949,7 +950,9 @@ static int device_pca957x_init(struct pca953x_chip *chip, u32 invert) goto out; /* To enable register 6, 7 to control pull up and pull down */ - memset(val, 0x02, NBANK(chip)); + for (i = 0; i < NBANK(chip); i++) + bitmap_set_value8(val, 0x02, i * BANK_SZ); + ret = pca953x_write_regs(chip, PCA957X_BKEN, val); if (ret) goto out;