From patchwork Wed Sep 4 09:38:48 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: 13790260 X-Patchwork-Delegate: kuba@kernel.org Received: from metis.whiteo.stw.pengutronix.de (metis.whiteo.stw.pengutronix.de [185.203.201.7]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0BC051CF5FF for ; Wed, 4 Sep 2024 09:42:33 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=185.203.201.7 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725442955; cv=none; b=WL7RrYVhxznJxFSAHOe/w0RpqCWr6DATF11IndlLglBH0xe2Ra9Fzz5dIzucJycMSXvlUmP0Qqkyr4+CGppg5gETMJDJaZYcjqtlWJK3IZVrq/Gxk45pLlF/M2N2lZgO0a4HNhaKAV886BICIf9lnfwcCq58X3xtI7+Tx1PIu0U= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725442955; c=relaxed/simple; bh=KLlXyqJWQdNcVjG1hf2LEyMctJ6QHje2S4BhWeQ/41I=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=lpUfozP6ovv9U3MiEv9A69LBSjyKMDXPS1curBPr/XRUfNFjD2Ylw0iMTObH/bj7zDvxVg+VKYzBoZ8FxvSYC68bXvZgy9MoApvTUdB249tCLvCRM8cEDhqHric1Wm0Kc1BYm4uAqGVa0GyL+gpv5RRGe4piotFI7E9m2ayRack= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=pengutronix.de; spf=pass smtp.mailfrom=pengutronix.de; arc=none smtp.client-ip=185.203.201.7 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=pengutronix.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=pengutronix.de 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 1slmX0-0004TD-RU for netdev@vger.kernel.org; Wed, 04 Sep 2024 11:42:30 +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 1slmWw-005QBB-U1 for netdev@vger.kernel.org; Wed, 04 Sep 2024 11:42:26 +0200 Received: from dspam.blackshift.org (localhost [127.0.0.1]) by bjornoya.blackshift.org (Postfix) with SMTP id 7868A3323ED for ; Wed, 04 Sep 2024 09:42:26 +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 120A1332370; Wed, 04 Sep 2024 09:42:23 +0000 (UTC) Received: from blackshift.org (localhost [::1]) by hardanger.blackshift.org (OpenSMTPD) with ESMTP id 97883286; Wed, 4 Sep 2024 09:42:22 +0000 (UTC) From: Marc Kleine-Budde To: netdev@vger.kernel.org Cc: davem@davemloft.net, kuba@kernel.org, linux-can@vger.kernel.org, kernel@pengutronix.de, Marc Kleine-Budde , Alibek Omarov , Heiko Stuebner Subject: [PATCH net-next 13/20] can: rockchip_canfd: implement workaround for erratum 12 Date: Wed, 4 Sep 2024 11:38:48 +0200 Message-ID: <20240904094218.1925386-14-mkl@pengutronix.de> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20240904094218.1925386-1-mkl@pengutronix.de> References: <20240904094218.1925386-1-mkl@pengutronix.de> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 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: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.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 Acked-by: Heiko Stuebner Link: https://patch.msgid.link/20240904-rockchip-canfd-v5-13-8ae22bcb27cc@pengutronix.de 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)