From patchwork Sun May 8 17:56:39 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Jonathan Cameron X-Patchwork-Id: 12842561 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id D72A6C433F5 for ; Sun, 8 May 2022 19:12:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229603AbiEHTPt (ORCPT ); Sun, 8 May 2022 15:15:49 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40172 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240579AbiEHSAU (ORCPT ); Sun, 8 May 2022 14:00:20 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2D781558C for ; Sun, 8 May 2022 10:56:29 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id BD35F61283 for ; Sun, 8 May 2022 17:56:28 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 24B86C385B0; Sun, 8 May 2022 17:56:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1652032588; bh=bhkzZLkd74lwiwhM1WdHhQOQXAjpo0JfxFUSearHju0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=RQcKdlGn0IuwAdEiCOYcUNPop1uZ8XjtIhbLEO1Qar1bq4hHs3NFdK/Cw2VMvKBLB QaSoqLaSwVviXptPl5LcGJzhL8nlXhomLTK0AaIP/cDc7V0KF+HMDAkt5saJftCAAF rlb/e40a5DOw6SsR2fl2JZ9jxBEVA9Vr0utLRVTtYOm/JsLXPStINinhuSnhaWXV0q P0HOu99/mpW6HmL4Teu3ZLL1Z9+79EgHhGtVTY9mOsbKX7fOVVw/hfL07r4cQhewYK 50D0/iaIhaLfJpqqIwWdAvkSqNBDNSdT+i/oPzptwiuQ5ft5P2kZ6VgiPU7dvs3dAc eejzHkv5a0uWg== From: Jonathan Cameron To: linux-iio@vger.kernel.org Cc: Alexandru Lazar , Akinobu Mita , Alexandru Tachici , Antoniu Miclaus , Charles-Antoine Couret , Cosmin Tanislav , David Lechner , Ivan Mikhaylov , Jacopo Mondi , Jean-Baptiste Maneyrol , Lars-Peter Clausen , Marcelo Schmitt , =?utf-8?q?M=C3=A5rten_Lindahl?= , Matt Ranostay , Matt Ranostay , Michael Hennerich , Michael Welling , Mugilraj Dhavachelvan , Navin Sankar Velliangiri , =?utf-8?q?Nuno_S=C3=A1?= , Paul Cercueil , Phil Reid , Puranjay Mohan , Ricardo Ribalda , Robert Jones , Rui Miguel Silva , Sean Nyekjaer , Tomas Melin , Tomislav Denis , =?utf-8?q?Uwe_Kleine-K=C3=B6nig?= , Jonathan Cameron Subject: [PATCH v2 59/92] iio: dac: ltc2688: Fix alignment for DMA safety Date: Sun, 8 May 2022 18:56:39 +0100 Message-Id: <20220508175712.647246-60-jic23@kernel.org> X-Mailer: git-send-email 2.36.0 In-Reply-To: <20220508175712.647246-1-jic23@kernel.org> References: <20220508175712.647246-1-jic23@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org From: Jonathan Cameron ____cacheline_aligned is an insufficient guarantee for non-coherent DMA on platforms with 128 byte cachelines above L1. Switch to the updated IIO_DMA_MINALIGN definition. Update the comment to include 'may'. Fixes: 832cb9eeb931 ("iio: dac: add support for ltc2688") Signed-off-by: Jonathan Cameron Acked-by: Nuno Sá --- drivers/iio/dac/ltc2688.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/iio/dac/ltc2688.c b/drivers/iio/dac/ltc2688.c index 2f9c384885f4..04ec38b1cad1 100644 --- a/drivers/iio/dac/ltc2688.c +++ b/drivers/iio/dac/ltc2688.c @@ -91,10 +91,10 @@ struct ltc2688_state { struct mutex lock; int vref; /* - * DMA (thus cache coherency maintenance) requires the + * DMA (thus cache coherency maintenance) may require the * transfer buffers to live in their own cache lines. */ - u8 tx_data[6] ____cacheline_aligned; + u8 tx_data[6] __aligned(IIO_DMA_MINALIGN); u8 rx_data[3]; };