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 X-Spam-Level: X-Spam-Status: No, score=-10.0 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE, SPF_PASS,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 589C9C33CB3 for ; Thu, 16 Jan 2020 17:44:12 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 1291524744 for ; Thu, 16 Jan 2020 17:44:12 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="JL735UVv"; dkim=fail reason="signature verification failed" (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="cU4IxDmJ" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 1291524744 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=Rubw7MLfVlMSd6tf4oK6JyhBPXV34w4lI8ICkJCTBKc=; b=JL735UVvaIeRKQ +Og0+Dje8Sx10feE6dQEuwFZaJj5pkD+uOHic+JduTh02SHkzsnttoypqkKOa6lydq0ebFxN7ya0Y IpZUPc3mc+k+59hfK9MUVvTMoReCfPHQkVFn41GGtAW1KPXxvV4TRkJlWi2xNzRlgn+PjbPlxjqsl VgyFmrylxOhgWDklr1NBFoWXLR7RjDrnmqmYzvkkfKgqjQyCpAcPravS1ZHLGEYlgaCNmCAEibEvq dXdPak3bU4syZ4aSTkXBHk6dQ+HbEyH66OCaEluWri1/U2c6w0gs/s4fz1UQ1MO2f4fAE67bzs35K jAbwv7bI2CzVxX+aiDdw==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1is9Bi-0004Ex-LD; Thu, 16 Jan 2020 17:44:10 +0000 Received: from mail.kernel.org ([198.145.29.99]) by bombadil.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1is8iB-0007Fu-Ic for linux-arm-kernel@lists.infradead.org; Thu, 16 Jan 2020 17:13:42 +0000 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id ED2A7246AF; Thu, 16 Jan 2020 17:13:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1579194817; bh=+CxYFBc/8Lv0av4t/LcQ5Gb0SPlDfpEfz1x4oLuxD0Y=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=cU4IxDmJ197BLuQLNCgqxK5YPuWU0/kA1743+YbXGMPqPmO5fmn4CRE45yoC9UqZu jwUDDE6uvbCiouBmkUqHxcs60Hq7STFzCFHpCj4+rM9eREjYiKNmONfvXC1gyPvB35 EiJtjb8sH7wVqGlbE/zlUglus030QwdXuAyrlq2A= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Subject: [PATCH AUTOSEL 4.19 623/671] spi: atmel: fix handling of cs_change set on non-last xfer Date: Thu, 16 Jan 2020 12:04:21 -0500 Message-Id: <20200116170509.12787-360-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200116170509.12787-1-sashal@kernel.org> References: <20200116170509.12787-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200116_091339_774259_5BB2DE12 X-CRM114-Status: GOOD ( 13.65 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Sasha Levin , Mans Rullgard , Gregory CLEMENT , Nicolas Ferre , linux-spi@vger.kernel.org, Mark Brown , linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: Mans Rullgard [ Upstream commit fed8d8c7a6dc2a76d7764842853d81c770b0788e ] The driver does the wrong thing when cs_change is set on a non-last xfer in a message. When cs_change is set, the driver deactivates the CS and leaves it off until a later xfer again has cs_change set whereas it should be briefly toggling CS off and on again. This patch brings the behaviour of the driver back in line with the documentation and common sense. The delay of 10 us is the same as is used by the default spi_transfer_one_message() function in spi.c. [gregory: rebased on for-5.5 from spi tree] Fixes: 8090d6d1a415 ("spi: atmel: Refactor spi-atmel to use SPI framework queue") Signed-off-by: Mans Rullgard Acked-by: Nicolas Ferre Signed-off-by: Gregory CLEMENT Link: https://lore.kernel.org/r/20191018153504.4249-1-gregory.clement@bootlin.com Signed-off-by: Mark Brown Signed-off-by: Sasha Levin --- drivers/spi/spi-atmel.c | 10 +++------- 1 file changed, 3 insertions(+), 7 deletions(-) diff --git a/drivers/spi/spi-atmel.c b/drivers/spi/spi-atmel.c index 2fb43c582559..5a9d7e252a77 100644 --- a/drivers/spi/spi-atmel.c +++ b/drivers/spi/spi-atmel.c @@ -305,7 +305,6 @@ struct atmel_spi { bool use_cs_gpios; bool keep_cs; - bool cs_active; u32 fifo_size; }; @@ -1381,11 +1380,9 @@ static int atmel_spi_one_transfer(struct spi_master *master, &msg->transfers)) { as->keep_cs = true; } else { - as->cs_active = !as->cs_active; - if (as->cs_active) - cs_activate(as, msg->spi); - else - cs_deactivate(as, msg->spi); + cs_deactivate(as, msg->spi); + udelay(10); + cs_activate(as, msg->spi); } } @@ -1408,7 +1405,6 @@ static int atmel_spi_transfer_one_message(struct spi_master *master, atmel_spi_lock(as); cs_activate(as, spi); - as->cs_active = true; as->keep_cs = false; msg->status = 0; -- 2.20.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel