From patchwork Fri Aug 30 19:26:10 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: 13785488 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 74DC7CA1009 for ; Fri, 30 Aug 2024 19:37:51 +0000 (UTC) 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:Cc:To:In-Reply-To:References :Message-Id:Content-Transfer-Encoding:Content-Type: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=NjgMAzXyB328mv1ytJ0sfk4/u5T+J0Dhf8YdBAfzs8o=; b=WGf80pImzLq2a+xgZBSSDnUWO9 t5gkl2jX0ZrIA72eABlpn/+zzuf9yZ31zIWFIx9pFn9XbR6TYm5ptrkK1b5FFybX2b6MxA1s6hT4u HRULCp1+wO3P5u2pQgMUjDfc2vACmYlH6QgLlcNr+7gqNf7H2rNULxJG4QYAYC1uw+hUao/7jsAN6 tBqJJG1gWwLhLuNBpdIJqEPgQy2bbY7s4RfuOHOASO12OdWq0SNX0D9TY5QOMaWTvVTa0I0hr4rGm f0tywENQiZ/ivJhg/JrO9oTqkEZBFRLgpA+Qw6MUFxrZxPC1g+IK9vBAk34h9NAyoejAfhdB0aE0D Xugu/VdQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1sk7RE-00000007UuP-3SQi; Fri, 30 Aug 2024 19:37:40 +0000 Received: from metis.whiteo.stw.pengutronix.de ([185.203.201.7]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1sk7H0-00000007RT7-0lHc for linux-arm-kernel@lists.infradead.org; Fri, 30 Aug 2024 19:27:07 +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 1sk7Gw-0006Ev-QJ for linux-arm-kernel@lists.infradead.org; Fri, 30 Aug 2024 21:27:02 +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 1sk7Go-004Djb-2O for linux-arm-kernel@lists.infradead.org; Fri, 30 Aug 2024 21:26:54 +0200 Received: from dspam.blackshift.org (localhost [127.0.0.1]) by bjornoya.blackshift.org (Postfix) with SMTP id 9E77E32E1C6 for ; Fri, 30 Aug 2024 19:26:53 +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 53CEE32E110; Fri, 30 Aug 2024 19:26:47 +0000 (UTC) Received: from [172.20.34.65] (localhost [::1]) by hardanger.blackshift.org (OpenSMTPD) with ESMTP id a5043944; Fri, 30 Aug 2024 19:26:45 +0000 (UTC) From: Marc Kleine-Budde Date: Fri, 30 Aug 2024 21:26:10 +0200 Subject: [PATCH can-next v3 13/20] can: rockchip_canfd: implement workaround for erratum 12 MIME-Version: 1.0 Message-Id: <20240830-rockchip-canfd-v3-13-d426266453fa@pengutronix.de> References: <20240830-rockchip-canfd-v3-0-d426266453fa@pengutronix.de> In-Reply-To: <20240830-rockchip-canfd-v3-0-d426266453fa@pengutronix.de> To: kernel@pengutronix.de, 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=1861; i=mkl@pengutronix.de; h=from:subject:message-id; bh=S2FPUCLf0HBw5+QixJBEj6Z5Avphz5THqZA6bqbQ93k=; b=owEBbQGS/pANAwAKASg4oj56LbxvAcsmYgBm0hzpP6wKpibmHfjLF1qfFuihHr56ftTgVnR6z LIlpPNt6IyJATMEAAEKAB0WIQRQQLqG4LYE3Sm8Pl8oOKI+ei28bwUCZtIc6QAKCRAoOKI+ei28 bx5dB/4yPBgAM53a48MOSFzCdZDUgDWQAgUuVlJECEna86uJhVcJos/7VYOYM9ogf04TXi7Ko3U NvzsxRchuy8RMckHiY5uv6QNDN6D0kzox+eBdnaXLt8JD4p7M8RY8oowyeHDfhhUuzkxux9GigX SZQpPLwpb7MawqNMFgcKGaL5gNIgQRz58nRIIHDc8gVeVXtxcI8WzNbjfHIstE2NiKzf4AYdfQW tU8h0fQ+h3JJSK4hPr4TqW9aaVr6gKMD9rjzQZ8ExQ/xsfFIAbvwtp8++0R5qOjn29F3zMJx3yP dh/AkVp8kUWwlvdOuH43+WPPVv/Pu+QTZvVV61ycv2i/aSXn 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-arm-kernel@lists.infradead.org X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240830_122706_272972_FA8AE90D X-CRM114-Status: GOOD ( 14.87 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=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: 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)