From patchwork Wed Sep 4 08:12:56 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: 13789941 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 BDEC118D63F for ; Wed, 4 Sep 2024 08:13:45 +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=1725437627; cv=none; b=aq9VyMR1XT720seINpLWjpXum38QhtwuGPrVn8M2YaLxZhmlr+x58MXUfPTVaWb9sSYXMwo16lUHcA+KznVkfTvYGUmbINzmvwbVdDm0vGPmQmVIkSoWeTeUQEeno7miyZ1SyUjWpTCwHYoQz859rN1+Dq8YCeaYA9NiOuuPjZg= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725437627; c=relaxed/simple; bh=sRQubshaT5v9vsvCT2lafCYIN0VsPNipEULSKOD/rxg=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=GGFklAhYE0/PKvfEsM3RdLZM49MplqlkHq7ap+uF4XmQtju+dgvOm9sr478JelaU05H6ETWdIdfM5yt45t6ZCjmPbeyCw4Ob9Xue31tl4UHKFJk0CixziW01hMY+o4q1jkRg/uaIRtF73x+Ri2zZ2bP+1oeFNPq3BgEs+/5u9fE= 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 1sll94-0007jU-NM for netdev@vger.kernel.org; Wed, 04 Sep 2024 10:13:42 +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 1sll8v-005OyO-T1 for netdev@vger.kernel.org; Wed, 04 Sep 2024 10:13:33 +0200 Received: from dspam.blackshift.org (localhost [127.0.0.1]) by bjornoya.blackshift.org (Postfix) with SMTP id 6C06A3320B3 for ; Wed, 04 Sep 2024 08:13:33 +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 03023331F6D; 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 0f7ecbcc; Wed, 4 Sep 2024 08:13:20 +0000 (UTC) From: Marc Kleine-Budde Date: Wed, 04 Sep 2024 10:12:56 +0200 Subject: [PATCH can-next v5 12/20] can: rockchip_canfd: implement workaround for erratum 6 Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240904-rockchip-canfd-v5-12-8ae22bcb27cc@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=5113; i=mkl@pengutronix.de; h=from:subject:message-id; bh=sRQubshaT5v9vsvCT2lafCYIN0VsPNipEULSKOD/rxg=; b=owEBbQGS/pANAwAKASg4oj56LbxvAcsmYgBm2BaT36djS2ulKpjFOj0CWU/oo7b1+mQ9/VcTt t5PkWqMo6yJATMEAAEKAB0WIQRQQLqG4LYE3Sm8Pl8oOKI+ei28bwUCZtgWkwAKCRAoOKI+ei28 b/2UCACJxIIraCUKbQ9/fg7sP04TuVx4QIIV/sLceJ4On1YMyiY4v82axt6DiAVQT8QUESKI33R y9+KJ4p2gvXQ532vTFkCaIJKw6Vtz+bh3enqYi7tXENzOVSu3irkz3JooflqqPqggMDfIr3JK1u Aj2f3AoAoVoO/XqfAMS6y/05PXeXO+8liLkw1N6/vW7Z6Jmhe+TKhnZFvSQAjWsTjtF97koD+Vj n0Kv/U8k2Q5V0ASUjEr5vZcwkf8wcOtQUVe9aRNwunQZrQqHoyvtQOV0fwiNM8UshOxtymx+ahK 9Df07dJB0vS8uQko3MClh+Tbqzkq+dI1xG19920x7bVQnkQk 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: 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: | The CAN controller's transmission of extended frames may | intermittently change into standard frames. | | When using the CAN controller to send extended frames, if the | 'tx_req' is configured as 1 and coincides with the internal | transmission point, the extended frame will be transmitted onto the | bus in the format of a standard frame. To work around Erratum 6, the driver is in self-receiving mode (RXSTX) and all received CAN frames are passed through rkcanfd_rxstx_filter(). Add a check in rkcanfd_rxstx_filter() whether the received frame corresponds to the current outgoing frame, but the extended CAN ID has been mangled to a standard ID. In this case re-send the original CAN frame. Tested-by: Alibek Omarov Signed-off-by: Marc Kleine-Budde --- drivers/net/can/rockchip/rockchip_canfd-rx.c | 44 ++++++++++++++++++++++++++++ drivers/net/can/rockchip/rockchip_canfd-tx.c | 8 +++++ drivers/net/can/rockchip/rockchip_canfd.h | 19 ++++++++++++ 3 files changed, 71 insertions(+) diff --git a/drivers/net/can/rockchip/rockchip_canfd-rx.c b/drivers/net/can/rockchip/rockchip_canfd-rx.c index 650dfd41e0a0..31cee3362f1e 100644 --- a/drivers/net/can/rockchip/rockchip_canfd-rx.c +++ b/drivers/net/can/rockchip/rockchip_canfd-rx.c @@ -95,6 +95,7 @@ static int rkcanfd_rxstx_filter(struct rkcanfd_priv *priv, const struct canfd_frame *cfd_rx, const u32 ts, bool *tx_done) { + struct net_device_stats *stats = &priv->ndev->stats; const struct canfd_frame *cfd_nominal; const struct sk_buff *skb; unsigned int tx_tail; @@ -130,6 +131,49 @@ static int rkcanfd_rxstx_filter(struct rkcanfd_priv *priv, return 0; } + if (!(priv->devtype_data.quirks & RKCANFD_QUIRK_RK3568_ERRATUM_6)) + return 0; + + /* Erratum 6: Extended frames may be send as standard frames. + * + * Not affected if: + * - TX'ed a standard frame -or- + * - RX'ed an extended frame + */ + if (!(cfd_nominal->can_id & CAN_EFF_FLAG) || + (cfd_rx->can_id & CAN_EFF_FLAG)) + return 0; + + /* Not affected if: + * - standard part and RTR flag of the TX'ed frame + * is not equal the CAN-ID and RTR flag of the RX'ed frame. + */ + if ((cfd_nominal->can_id & (CAN_RTR_FLAG | CAN_SFF_MASK)) != + (cfd_rx->can_id & (CAN_RTR_FLAG | CAN_SFF_MASK))) + return 0; + + /* Not affected if: + * - length is not the same + */ + if (cfd_nominal->len != cfd_rx->len) + return 0; + + /* Not affected if: + * - the data of non RTR frames is different + */ + if (!(cfd_nominal->can_id & CAN_RTR_FLAG) && + memcmp(cfd_nominal->data, cfd_rx->data, cfd_nominal->len)) + return 0; + + /* Affected by Erratum 6 */ + + *tx_done = true; + + stats->tx_packets++; + stats->tx_errors++; + + rkcanfd_xmit_retry(priv); + return 0; } diff --git a/drivers/net/can/rockchip/rockchip_canfd-tx.c b/drivers/net/can/rockchip/rockchip_canfd-tx.c index 668a902f4c2a..e98e7a836b83 100644 --- a/drivers/net/can/rockchip/rockchip_canfd-tx.c +++ b/drivers/net/can/rockchip/rockchip_canfd-tx.c @@ -14,6 +14,14 @@ static void rkcanfd_start_xmit_write_cmd(const struct rkcanfd_priv *priv, rkcanfd_write(priv, RKCANFD_REG_CMD, reg_cmd); } +void rkcanfd_xmit_retry(struct rkcanfd_priv *priv) +{ + const unsigned int tx_head = rkcanfd_get_tx_head(priv); + const u32 reg_cmd = RKCANFD_REG_CMD_TX_REQ(tx_head); + + rkcanfd_start_xmit_write_cmd(priv, reg_cmd); +} + int rkcanfd_start_xmit(struct sk_buff *skb, struct net_device *ndev) { struct rkcanfd_priv *priv = netdev_priv(ndev); diff --git a/drivers/net/can/rockchip/rockchip_canfd.h b/drivers/net/can/rockchip/rockchip_canfd.h index a4688411e586..3fe6ddcdd8ac 100644 --- a/drivers/net/can/rockchip/rockchip_canfd.h +++ b/drivers/net/can/rockchip/rockchip_canfd.h @@ -342,6 +342,24 @@ /* Erratum 6: The CAN controller's transmission of extended frames may * intermittently change into standard frames + * + * Work around this issue by activating self reception (RXSTX). If we + * have pending TX CAN frames, check all RX'ed CAN frames in + * rkcanfd_rxstx_filter(). + * + * If it's a frame we've send and it's OK, call the TX complete + * handler: rkcanfd_handle_tx_done_one(). Mask the TX complete IRQ. + * + * If it's a frame we've send, but the CAN-ID is mangled, resend the + * original extended frame. + * + * To reproduce: + * host: + * canfdtest -evx -g can0 + * candump any,0:80000000 -cexdtA + * dut: + * canfdtest -evx can0 + * ethtool -S can0 */ #define RKCANFD_QUIRK_RK3568_ERRATUM_6 BIT(5) @@ -499,6 +517,7 @@ int rkcanfd_handle_rx_int(struct rkcanfd_priv *priv); void rkcanfd_timestamp_init(struct rkcanfd_priv *priv); +void rkcanfd_xmit_retry(struct rkcanfd_priv *priv); int rkcanfd_start_xmit(struct sk_buff *skb, struct net_device *ndev); void rkcanfd_handle_tx_done_one(struct rkcanfd_priv *priv, const u32 ts, unsigned int *frame_len_p);