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 2C1F4C77B7F for ; Sun, 7 May 2023 00:39:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232580AbjEGAjH (ORCPT ); Sat, 6 May 2023 20:39:07 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57288 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232387AbjEGAiU (ORCPT ); Sat, 6 May 2023 20:38:20 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5B32C10A; Sat, 6 May 2023 17:36:46 -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 F0E756155C; Sun, 7 May 2023 00:36:23 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 88613C4339C; Sun, 7 May 2023 00:36:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1683419783; bh=Htpo8krxL7BOoqzFGpJA2I0Wp6KsXnO7PzVDxuTr0UU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=iemy9mXe7BIlFCKegA/KcCQIrGP1jMF75v4PFxn4hCvMLxVtgsE+yWfyavZjidZci xk8JbTxinj06lWMZw73tlSogk5dUjVaGxUGa7GKGxjhHtjyCaF99/iMU4ewrlGOtYu VEw1tU7GCKeA9PNa6XJ1L53cXS/FkrhXbqMI+fVVHOy05fW8a348ZGOm8RO8gxPWkD GTgQelErSLn3EEd6M/4qTo49KMm4iFJwkgPSSebY+ET8MAoPz5iUYrvF/8ZEvHGJES PMdjzmM4UKKt0F6Nj6oP9kA9NcAkzJVt0TZOLoUH7Cipk8w+lVPQqstSNBhvgQI0LG uH3ZHr+fWoHFg== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Kevin Groeneveld , Mark Brown , Sasha Levin , shawnguo@kernel.org, linux-spi@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: [PATCH AUTOSEL 5.4 5/9] spi: spi-imx: fix MX51_ECSPI_* macros when cs > 3 Date: Sat, 6 May 2023 20:36:05 -0400 Message-Id: <20230507003609.4079746-5-sashal@kernel.org> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230507003609.4079746-1-sashal@kernel.org> References: <20230507003609.4079746-1-sashal@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Kevin Groeneveld [ Upstream commit 87c614175bbf28d3fd076dc2d166bac759e41427 ] When using gpio based chip select the cs value can go outside the range 0 – 3. The various MX51_ECSPI_* macros did not take this into consideration resulting in possible corruption of the configuration. For example for any cs value over 3 the SCLKPHA bits would not be set and other values in the register possibly corrupted. One way to fix this is to just mask the cs bits to 2 bits. This still allows all 4 native chip selects to work as well as gpio chip selects (which can use any of the 4 chip select configurations). Signed-off-by: Kevin Groeneveld Link: https://lore.kernel.org/r/20230318222132.3373-1-kgroeneveld@lenbrook.com Signed-off-by: Mark Brown Signed-off-by: Sasha Levin --- drivers/spi/spi-imx.c | 24 ++++++++++++++++++------ 1 file changed, 18 insertions(+), 6 deletions(-) diff --git a/drivers/spi/spi-imx.c b/drivers/spi/spi-imx.c index 9d593675257e0..67f31183c1180 100644 --- a/drivers/spi/spi-imx.c +++ b/drivers/spi/spi-imx.c @@ -239,6 +239,18 @@ static bool spi_imx_can_dma(struct spi_master *master, struct spi_device *spi, return true; } +/* + * Note the number of natively supported chip selects for MX51 is 4. Some + * devices may have less actual SS pins but the register map supports 4. When + * using gpio chip selects the cs values passed into the macros below can go + * outside the range 0 - 3. We therefore need to limit the cs value to avoid + * corrupting bits outside the allocated locations. + * + * The simplest way to do this is to just mask the cs bits to 2 bits. This + * still allows all 4 native chip selects to work as well as gpio chip selects + * (which can use any of the 4 chip select configurations). + */ + #define MX51_ECSPI_CTRL 0x08 #define MX51_ECSPI_CTRL_ENABLE (1 << 0) #define MX51_ECSPI_CTRL_XCH (1 << 2) @@ -247,16 +259,16 @@ static bool spi_imx_can_dma(struct spi_master *master, struct spi_device *spi, #define MX51_ECSPI_CTRL_DRCTL(drctl) ((drctl) << 16) #define MX51_ECSPI_CTRL_POSTDIV_OFFSET 8 #define MX51_ECSPI_CTRL_PREDIV_OFFSET 12 -#define MX51_ECSPI_CTRL_CS(cs) ((cs) << 18) +#define MX51_ECSPI_CTRL_CS(cs) ((cs & 3) << 18) #define MX51_ECSPI_CTRL_BL_OFFSET 20 #define MX51_ECSPI_CTRL_BL_MASK (0xfff << 20) #define MX51_ECSPI_CONFIG 0x0c -#define MX51_ECSPI_CONFIG_SCLKPHA(cs) (1 << ((cs) + 0)) -#define MX51_ECSPI_CONFIG_SCLKPOL(cs) (1 << ((cs) + 4)) -#define MX51_ECSPI_CONFIG_SBBCTRL(cs) (1 << ((cs) + 8)) -#define MX51_ECSPI_CONFIG_SSBPOL(cs) (1 << ((cs) + 12)) -#define MX51_ECSPI_CONFIG_SCLKCTL(cs) (1 << ((cs) + 20)) +#define MX51_ECSPI_CONFIG_SCLKPHA(cs) (1 << ((cs & 3) + 0)) +#define MX51_ECSPI_CONFIG_SCLKPOL(cs) (1 << ((cs & 3) + 4)) +#define MX51_ECSPI_CONFIG_SBBCTRL(cs) (1 << ((cs & 3) + 8)) +#define MX51_ECSPI_CONFIG_SSBPOL(cs) (1 << ((cs & 3) + 12)) +#define MX51_ECSPI_CONFIG_SCLKCTL(cs) (1 << ((cs & 3) + 20)) #define MX51_ECSPI_INT 0x10 #define MX51_ECSPI_INT_TEEN (1 << 0) -- 2.39.2