From patchwork Wed Sep 4 08:12:57 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Marc Kleine-Budde X-Patchwork-Id: 13789966 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 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 smtp.lore.kernel.org (Postfix) with ESMTPS id CCCCFCA0ED3 for ; Wed, 4 Sep 2024 08:22:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:Cc:To:In-Reply-To:References:Message-Id :MIME-Version:Subject:Date:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=EEE8GQsLG3JwfzVC5zo5xnCQBfo71zY66Ry9n4f/+Qg=; b=4C23MtDmAO57OT eUOuvcBblMKxrtoAqXywjvPWUaBY8Rt6frSJOIIV8oSmFvqprL7AajBScyI1Qxyf3Bohr2RalikVN MEgAaA/H8XUGejMuRnMxXhtPRz1CBu4zfOSnOP4azkYgrSk9A+prJC4r2fl+ayTWPYBbhQj8EM9Ip ooM30+cIKZOD4z2PGN8cVcenpltoomZ98CSkDSkcUhS2aW/SZiTJUEes1QSYx4fshGyX36p8i+TSD P9tNLEH0w6KyhLTXK2L0ME1SOLAnM8UfaGpOWuc94/WCDMmOAOIcElV23x5esk5t2OWPg58rANEG/ HS4o+yvCrfZcS52GJFAA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1sllHJ-00000003NTJ-2kZt; Wed, 04 Sep 2024 08:22:13 +0000 Received: from metis.whiteo.stw.pengutronix.de ([2a0a:edc0:2:b01:1d::104]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1sll92-00000003KhP-3n7F for linux-rockchip@lists.infradead.org; Wed, 04 Sep 2024 08:13:44 +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 1sll8y-0007dD-7c for linux-rockchip@lists.infradead.org; Wed, 04 Sep 2024 10:13:36 +0200 Received: from [2a0a:edc0:0:b01:1d::7b] (helo=bjornoya.blackshift.org) 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 1sll8s-005Ose-KC for linux-rockchip@lists.infradead.org; Wed, 04 Sep 2024 10:13:30 +0200 Received: from dspam.blackshift.org (localhost [127.0.0.1]) by bjornoya.blackshift.org (Postfix) with SMTP id 3BE3B332037 for ; Wed, 04 Sep 2024 08:13:30 +0000 (UTC) Received: from hardanger.blackshift.org (unknown [172.20.34.65]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (Client did not present a certificate) by bjornoya.blackshift.org (Postfix) with ESMTPS id 1C9DD331F70; Wed, 04 Sep 2024 08:13:23 +0000 (UTC) Received: from [172.20.34.65] (localhost [::1]) by hardanger.blackshift.org (OpenSMTPD) with ESMTP id 01707a85; Wed, 4 Sep 2024 08:13:20 +0000 (UTC) From: Marc Kleine-Budde Date: Wed, 04 Sep 2024 10:12:57 +0200 Subject: [PATCH can-next v5 13/20] can: rockchip_canfd: implement workaround for erratum 12 MIME-Version: 1.0 Message-Id: <20240904-rockchip-canfd-v5-13-8ae22bcb27cc@pengutronix.de> References: <20240904-rockchip-canfd-v5-0-8ae22bcb27cc@pengutronix.de> In-Reply-To: <20240904-rockchip-canfd-v5-0-8ae22bcb27cc@pengutronix.de> To: kernel@pengutronix.de, Alibek Omarov , Vincent Mailhol , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Heiko Stuebner , Philipp Zabel , Elaine Zhang , David Jander Cc: Simon Horman , linux-can@vger.kernel.org, netdev@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-rockchip@lists.infradead.org, linux-kernel@vger.kernel.org, Marc Kleine-Budde X-Mailer: b4 0.15-dev-99b12 X-Developer-Signature: v=1; a=openpgp-sha256; l=1911; i=mkl@pengutronix.de; h=from:subject:message-id; bh=EE4AmGzepXHNHoSI5zv7ndjZkcaM0ScMwEQQxZFgWvQ=; b=owEBbQGS/pANAwAKASg4oj56LbxvAcsmYgBm2BaU2IV77e9SK7EqFvXpb15hsu01hgjK3h933 m+o0siPdd+JATMEAAEKAB0WIQRQQLqG4LYE3Sm8Pl8oOKI+ei28bwUCZtgWlAAKCRAoOKI+ei28 bxxNB/0Uq/zqFh9PH8pK8tmKUpaZHVCNq22WSLYbpWDz+ZyH+9xu4cB473RcxvcokIK1hl7IZrs RZbXuBU/esYFjLn2sVaBIB/UVZJjO65JonVSNUg/O7KaicjyaUHVJA1IGYw94jl8bpAArr5Tamd yDeaj9DjQTP779/hzHHb20FUpMwQhagdG8c5kcItCY5GPC/sFTm/37H4TJyPPxYAldCUgoFpwXJ KsteRbqRBqPu/j35eb0BWSmE8DmdKXQBLbvx6APYL7LaSWoun93qzJ4ZF3KKOA8h6VshrQ/eUuH bLXAg9h+BSuIdk3GTnLj93O//CxU3sEpaEph+AcBgUYwY1aw X-Developer-Key: i=mkl@pengutronix.de; a=openpgp; fpr=C1400BA0B3989E6FBC7D5B5C2B5EE211C58AEA54 X-SA-Exim-Connect-IP: 2a0a:edc0:0:c01:1d::a2 X-SA-Exim-Mail-From: mkl@pengutronix.de X-SA-Exim-Scanned: No (on metis.whiteo.stw.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: linux-rockchip@lists.infradead.org X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240904_011340_984656_6D7E80F1 X-CRM114-Status: GOOD ( 13.86 ) X-BeenThere: linux-rockchip@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Upstream kernel work for Rockchip platforms List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "Linux-rockchip" Errors-To: linux-rockchip-bounces+linux-rockchip=archiver.kernel.org@lists.infradead.org The rk3568 CAN-FD errata sheet as of Tue 07 Nov 2023 11:25:31 +08:00 says: | A dominant bit at the third bit of the intermission may cause a | transmission error. | | When sampling the third bit of the intermission as a dominant bit, if | tx_req is configured to transmit extended frames at this time, the | extended frame may be sent to the bus in the format of a standard | frame. The extended frame will be sent as a standard frame and will not | result in error frames Turn on "Interframe Spaceing RX Mode" only during TX to work around erratum 12, according to rock-chip: | Spaceing RX Mode = 1, the third Bit between frames cannot receive | and send, and the fourth Bit begins to receive and send. | | Spaceing RX Mode = 0, allowing the third Bit between frames to | receive and send. Message-ID: Tested-by: Alibek Omarov Signed-off-by: Marc Kleine-Budde --- drivers/net/can/rockchip/rockchip_canfd-tx.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/net/can/rockchip/rockchip_canfd-tx.c b/drivers/net/can/rockchip/rockchip_canfd-tx.c index e98e7a836b83..9db6d90a4e7f 100644 --- a/drivers/net/can/rockchip/rockchip_canfd-tx.c +++ b/drivers/net/can/rockchip/rockchip_canfd-tx.c @@ -11,7 +11,14 @@ static void rkcanfd_start_xmit_write_cmd(const struct rkcanfd_priv *priv, const u32 reg_cmd) { + if (priv->devtype_data.quirks & RKCANFD_QUIRK_RK3568_ERRATUM_12) + rkcanfd_write(priv, RKCANFD_REG_MODE, priv->reg_mode_default | + RKCANFD_REG_MODE_SPACE_RX_MODE); + rkcanfd_write(priv, RKCANFD_REG_CMD, reg_cmd); + + if (priv->devtype_data.quirks & RKCANFD_QUIRK_RK3568_ERRATUM_12) + rkcanfd_write(priv, RKCANFD_REG_MODE, priv->reg_mode_default); } void rkcanfd_xmit_retry(struct rkcanfd_priv *priv)