From patchwork Mon Jul 29 13:05:45 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: 13744922 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 A75C0C3DA7E for ; Mon, 29 Jul 2024 13:12:58 +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=ABXi24NyeIa4d1HrpPHCjukfrU43dlPEy0gPSM6YLiw=; b=EGtM0595Fyz/TINnhfLWFwmJlO +1+FMxZ30I7zKNn/zEGn2NK3MqwrXEyvAKfrX4wIcdMjgtpw5xZM094S6K9nsWAXg1aD1iJHcPy5U 1EXFSP60MgjKFLVBJe0nAEi8vrvZMOd+BXXi8zMGtcVoOh8IEb4Uvt5zj955bN9rVeuwgPKn4C3q7 yoxGOFa5dJEZwo4z+ABGM5e38gK6RxZ/XmhJdimpVOyh9PVgWrwIproX/ygqQn/cFp/i99DGSw86z d9as6RmCzFp2uodedP9/TwBLhdBB+ybRBCVcydZeP9/7/rJB14+0NlSnRMiUIeKXYq61Ci3kQGZQY Mc/qcjAg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1sYQBG-0000000BNbd-2okz; Mon, 29 Jul 2024 13:12:50 +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 1sYQ5q-0000000BLM0-1yuG for linux-arm-kernel@lists.infradead.org; Mon, 29 Jul 2024 13:07:15 +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 1sYQ5p-0000fM-6c for linux-arm-kernel@lists.infradead.org; Mon, 29 Jul 2024 15:07:13 +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 1sYQ5n-0033Ep-R6 for linux-arm-kernel@lists.infradead.org; Mon, 29 Jul 2024 15:07:11 +0200 Received: from dspam.blackshift.org (localhost [127.0.0.1]) by bjornoya.blackshift.org (Postfix) with SMTP id 8146F310E7D for ; Mon, 29 Jul 2024 13:07:11 +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 1E895310E1F; Mon, 29 Jul 2024 13:07:03 +0000 (UTC) Received: from [172.20.34.65] (localhost [::1]) by hardanger.blackshift.org (OpenSMTPD) with ESMTP id c082d89f; Mon, 29 Jul 2024 13:06:31 +0000 (UTC) From: Marc Kleine-Budde Date: Mon, 29 Jul 2024 15:05:45 +0200 Subject: [PATCH can-next 14/21] can: rockchip_canfd: implement workaround for erratum 12 MIME-Version: 1.0 Message-Id: <20240729-rockchip-canfd-v1-14-fa1250fd6be3@pengutronix.de> References: <20240729-rockchip-canfd-v1-0-fa1250fd6be3@pengutronix.de> In-Reply-To: <20240729-rockchip-canfd-v1-0-fa1250fd6be3@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: 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-37811 X-Developer-Signature: v=1; a=openpgp-sha256; l=1861; i=mkl@pengutronix.de; h=from:subject:message-id; bh=ee6LiJ0gzdvEi91J92ecxXekliPZWURCz1Q0PcfyHos=; b=owEBbQGS/pANAwAKASg4oj56LbxvAcsmYgBmp5PKrCR7BiqWsF0Q3i+7FN+3zdpWuifKWtTXX Y02RgipKUiJATMEAAEKAB0WIQRQQLqG4LYE3Sm8Pl8oOKI+ei28bwUCZqeTygAKCRAoOKI+ei28 b+1UB/0dVmiYw7AZKVxVXrcYRfpx6KjToz3LSZRoWyXNnT7jcGVUHsxg5UcrGyD4seIT3rRT8hE HB8BT8BHCKWvnJaRZ8Ukw/c3Mc6U0pyTvPFMXY80ZFDtw+ztjg25znXgP4j6yJ3LQnwo8zgTnLK s6FsSTB0+42rdLpGd5CkLQgNsXP/9GW5hjHiV+YoFsnLEOzmTKUnAoABxobQpSQgFSIpnDkbXMz P2cw7Bz5zXMZpEtn9A9yHENEI2HKjVOiokCcjgblyGgzJyn6yoch4rVwIa8S2LlShlkJvBPnlD3 a+V32ElnNAEknt6pl+ZVliJuQCjU1AUXMxWocZVGtv4gPIBg 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-20240729_060714_544407_4F9FD215 X-CRM114-Status: GOOD ( 14.55 ) 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 fcf7d8f07118..43d011ab6455 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)