From mboxrd@z Thu Jan 1 00:00:00 1970 Delivery-date: Thu, 26 Sep 2024 13:23:57 +0200 Received: from metis.whiteo.stw.pengutronix.de ([2a0a:edc0:2:b01:1d::104]) by lore.white.stw.pengutronix.de with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.96) (envelope-from ) id 1stmbE-002ytY-05 for lore@lore.pengutronix.de; Thu, 26 Sep 2024 13:23:57 +0200 Received: from bombadil.infradead.org ([2607:7c80:54:3::133]) by metis.whiteo.stw.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1stmbC-0002u8-B8 for lore@pengutronix.de; Thu, 26 Sep 2024 13:23:56 +0200 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:To:In-Reply-To:References: Message-Id:Content-Transfer-Encoding:Content-Type:MIME-Version:Subject:Date: From:Reply-To:Cc:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=A+fZ9v/OyNgfR5E6yhR/lXUHxGJIJT8qlFt+dBrahhE=; b=b+fxSAkmWIx0WrKnhcb2xA3olv jIK+XCJe6mkxmn07bJ5F6A/GD2g0xupfFCmkzR14AjVLvp/vAL7CA7bPG6d46Bd8/Nrp2GdUKSNCw F+sKvOyT/b/SQBfgMILKLCfR6re40u/K65ogEVHrIGswq2GOTzntzrwrxfCAkMzY4k7dSlyIb911z EeUCLGLAP8PFXdAUvionZhz4ePeeciZ6fA6+YKTkxvpomovw88H20uq+FVwNPron1kDvbgKf6/XkY BYEcmyXuarnF/+vK58UefFZz4o9Qs1fZtaZjk0ZbhYjxPFAiVxkLdJmtgvplG8X8GluorefCq3GlQ 7OY1rohA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1stmae-00000008Dl9-2D4Z; Thu, 26 Sep 2024 11:23:20 +0000 Received: from metis.whiteo.stw.pengutronix.de ([2a0a:edc0:2:b01:1d::104]) by bombadil.infradead.org with esmtps (Exim 4.98 #2 (Red Hat Linux)) id 1stmZ1-00000008DKD-0kkq for barebox@lists.infradead.org; Thu, 26 Sep 2024 11:21:40 +0000 Received: from drehscheibe.grey.stw.pengutronix.de ([2a0a:edc0:0:c01:1d::a2]) by metis.whiteo.stw.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1stmZ0-00019G-05; Thu, 26 Sep 2024 13:21:38 +0200 Received: from [2a0a:edc0:0:1101:1d::28] (helo=dude02.red.stw.pengutronix.de) by drehscheibe.grey.stw.pengutronix.de with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1stmYz-001fkr-IK; Thu, 26 Sep 2024 13:21:37 +0200 Received: from localhost ([::1] helo=dude02.red.stw.pengutronix.de) by dude02.red.stw.pengutronix.de with esmtp (Exim 4.96) (envelope-from ) id 1stmYz-00Fi9J-33; Thu, 26 Sep 2024 13:21:37 +0200 From: Sascha Hauer Date: Thu, 26 Sep 2024 13:21:40 +0200 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20240926-spi-gpio-v2-4-3bf7b511c8c0@pengutronix.de> References: <20240926-spi-gpio-v2-0-3bf7b511c8c0@pengutronix.de> In-Reply-To: <20240926-spi-gpio-v2-0-3bf7b511c8c0@pengutronix.de> To: "open list:BAREBOX" X-Mailer: b4 0.12.3 X-Developer-Signature: v=1; a=ed25519-sha256; t=1727349697; l=670; i=s.hauer@pengutronix.de; s=20230412; h=from:subject:message-id; bh=S3uPPzLBGhw6R+Yijjx+e0po4cmOYRVleKg6TtVrHyM=; b=Y/BbX12xX73mmQliDO1KEG3O9fnjx6PH5vjPy+ewivsq6NqF2Ijd3J82VEGgUyK8Be5/Cn+6V V5nPQT8d4qyBQ7zTgIcgAWG/2ZJddvOn8SCZQKAUXk5RgGUvNHvZY3/ X-Developer-Key: i=s.hauer@pengutronix.de; a=ed25519; pk=4kuc9ocmECiBJKWxYgqyhtZOHj5AWi7+d0n/UjhkwTg= X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240926_042139_259785_05A28EB5 X-CRM114-Status: UNSURE ( 9.39 ) X-CRM114-Notice: Please train this message. X-BeenThere: barebox@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "barebox" X-SA-Exim-Connect-IP: 2607:7c80:54:3::133 X-SA-Exim-Mail-From: barebox-bounces+lore=pengutronix.de@lists.infradead.org X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on metis.whiteo.stw.pengutronix.de X-Spam-Level: X-Spam-Status: No, score=-4.0 required=4.0 tests=AWL,BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_NONE autolearn=unavailable autolearn_force=no version=3.4.2 Subject: [PATCH v2 4/5] spi: spi-gpio: deassert CS during setup X-SA-Exim-Version: 4.2.1 (built Wed, 08 May 2019 21:11:16 +0000) X-SA-Exim-Scanned: Yes (on metis.whiteo.stw.pengutronix.de) The initial CS gpio state is unknown. When it's asserted the first transfer might fail. Deassert the CS during setup to make sure the slave gets a fresh start. Signed-off-by: Sascha Hauer --- drivers/spi/gpio_spi.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/spi/gpio_spi.c b/drivers/spi/gpio_spi.c index 417e8db30e..36e6204283 100644 --- a/drivers/spi/gpio_spi.c +++ b/drivers/spi/gpio_spi.c @@ -165,6 +165,7 @@ static int gpio_spi_transfer(struct spi_device *spi, struct spi_message *msg) static int gpio_spi_setup(struct spi_device *spi) { + gpio_spi_set_cs(spi, 0); return 0; } -- 2.39.5