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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id F40C8C77B75 for ; Mon, 8 May 2023 10:10:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234177AbjEHKK4 (ORCPT ); Mon, 8 May 2023 06:10:56 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38822 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234174AbjEHKKx (ORCPT ); Mon, 8 May 2023 06:10:53 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 61E942EB3F for ; Mon, 8 May 2023 03:10:51 -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 EABF2623CC for ; Mon, 8 May 2023 10:10:50 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id D3185C433D2; Mon, 8 May 2023 10:10:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1683540650; bh=zoGMQGMFbglB5lHLXBTmhwsFqMp41yfqN9xHd9r/pYE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=UnGRoQcP0iagsdreCK4CbWGwPDqlVSUA/y0W6IF/q89XD45qOc5IJDxt4jBPpl4A/ 2VX4FM/MTlvnpA9ZzF6A7zx0BttTaE/E05nG9wUM2Mp/rTFzZcF995hlmJsYZ55uzy wrDOR18T4W8rxOpEXtJAFcW5V9qKfUBGQ5TDil/U= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Christophe Leroy , Joakim Tjernlund , Mark Brown , Sasha Levin Subject: [PATCH 6.1 418/611] spi: fsl-spi: Fix CPM/QE mode Litte Endian Date: Mon, 8 May 2023 11:44:20 +0200 Message-Id: <20230508094435.804146081@linuxfoundation.org> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20230508094421.513073170@linuxfoundation.org> References: <20230508094421.513073170@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Christophe Leroy [ Upstream commit c20c57d9868d7f9fd1b2904c7801b07e128f6322 ] CPM has the same problem as QE so for CPM also use the fix added by commit 0398fb70940e ("spi/spi_mpc8xxx: Fix QE mode Litte Endian"): CPM mode uses Little Endian so words > 8 bits are byte swapped. Workaround this by always enforcing wordsize 8 for 16 and 32 bits words. Unfortunately this will not work for LSB transfers where wordsize is > 8 bits so disable these for now. Also limit the workaround to 16 and 32 bits words because it can only work for multiples of 8-bits. Signed-off-by: Christophe Leroy Cc: Joakim Tjernlund Fixes: 0398fb70940e ("spi/spi_mpc8xxx: Fix QE mode Litte Endian") Link: https://lore.kernel.org/r/1b7d3e84b1128f42c1887dd2fb9cdf390f541bc1.1680371809.git.christophe.leroy@csgroup.eu Signed-off-by: Mark Brown Signed-off-by: Sasha Levin --- drivers/spi/spi-fsl-spi.c | 12 +++++++----- 1 file changed, 7 insertions(+), 5 deletions(-) diff --git a/drivers/spi/spi-fsl-spi.c b/drivers/spi/spi-fsl-spi.c index 93152144fd2ec..5602f052b2b50 100644 --- a/drivers/spi/spi-fsl-spi.c +++ b/drivers/spi/spi-fsl-spi.c @@ -181,8 +181,8 @@ static int mspi_apply_qe_mode_quirks(struct spi_mpc8xxx_cs *cs, struct spi_device *spi, int bits_per_word) { - /* QE uses Little Endian for words > 8 - * so transform all words > 8 into 8 bits + /* CPM/QE uses Little Endian for words > 8 + * so transform 16 and 32 bits words into 8 bits * Unfortnatly that doesn't work for LSB so * reject these for now */ /* Note: 32 bits word, LSB works iff @@ -190,9 +190,11 @@ static int mspi_apply_qe_mode_quirks(struct spi_mpc8xxx_cs *cs, if (spi->mode & SPI_LSB_FIRST && bits_per_word > 8) return -EINVAL; - if (bits_per_word > 8) + if (bits_per_word <= 8) + return bits_per_word; + if (bits_per_word == 16 || bits_per_word == 32) return 8; /* pretend its 8 bits */ - return bits_per_word; + return -EINVAL; } static int fsl_spi_setup_transfer(struct spi_device *spi, @@ -222,7 +224,7 @@ static int fsl_spi_setup_transfer(struct spi_device *spi, bits_per_word = mspi_apply_cpu_mode_quirks(cs, spi, mpc8xxx_spi, bits_per_word); - else if (mpc8xxx_spi->flags & SPI_QE) + else bits_per_word = mspi_apply_qe_mode_quirks(cs, spi, bits_per_word); -- 2.39.2