From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 6623A143C49; Tue, 23 Apr 2024 21:45:22 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1713908722; cv=none; b=BAPD0+L6RIR8V9+1YOfehLy61nl5JIQHwHFEhMvCFuKuM2KalpMmbyi2zAV8G+lzk7GUlYBCWehCeBg7/Qqx4UoL3EWGheYr/0hqk9L0RqvJnqeRPg7YWUKpvEZtsiOb/AdoFtKHCBT+ZGCSBebAHV6Y1eAFM8/Rsoxt2FPJYsc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1713908722; c=relaxed/simple; bh=q8AzzETJ75LJq/aQZNV4MF8V+jha1tQqpLqM/kmnxAE=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=qCZvL1xHHyxxZ8FbCkkycWZVsQtL8gOS3axQ4RAyGF697a0Nn20TU75onGAYT9WvlhG/ad218iN9k4EFrdYz7fj/iMRMbvuj15mtswZylM1/jr4ABDYXC2Z67dx1BseclkC5ktcZsR9NwRFGEjaOjqZG/JRwCOqITrAEkkcBdTo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=RCihTU6G; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="RCihTU6G" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3B6B8C32782; Tue, 23 Apr 2024 21:45:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1713908722; bh=q8AzzETJ75LJq/aQZNV4MF8V+jha1tQqpLqM/kmnxAE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=RCihTU6GlYpcPAl3TM6dYihoa6gzq1c4vfEzolTXx+gALegwRmj2VZGrsCXgHWpgR RAxPCRPBOQJn19jnjfNirOHlkQnYhITpqHUIX59oYazxl13oGUBHZuZrGuifjzsOm3 LYfAqGUkF8+oILctK4zUN24xljzkwUCRlU+HqAcA= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Schuyler Patton , Siddharth Vadapalli , Roger Quadros , Jakub Kicinski , Sasha Levin Subject: [PATCH 6.1 047/141] net: ethernet: ti: am65-cpsw-nuss: cleanup DMA Channels before using them Date: Tue, 23 Apr 2024 14:38:35 -0700 Message-ID: <20240423213854.785404499@linuxfoundation.org> X-Mailer: git-send-email 2.44.0 In-Reply-To: <20240423213853.356988651@linuxfoundation.org> References: <20240423213853.356988651@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.1-stable review patch. If anyone has any objections, please let me know. ------------------ From: Siddharth Vadapalli [ Upstream commit c24cd679b075b0e953ea167b0aa2b2d59e4eba7f ] The TX and RX DMA Channels used by the driver to exchange data with CPSW are not guaranteed to be in a clean state during driver initialization. The Bootloader could have used the same DMA Channels without cleaning them up in the event of failure. Thus, reset and disable the DMA Channels to ensure that they are in a clean state before using them. Fixes: 93a76530316a ("net: ethernet: ti: introduce am65x/j721e gigabit eth subsystem driver") Reported-by: Schuyler Patton Signed-off-by: Siddharth Vadapalli Reviewed-by: Roger Quadros Link: https://lore.kernel.org/r/20240417095425.2253876-1-s-vadapalli@ti.com Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin --- drivers/net/ethernet/ti/am65-cpsw-nuss.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/drivers/net/ethernet/ti/am65-cpsw-nuss.c b/drivers/net/ethernet/ti/am65-cpsw-nuss.c index 76fabeae512db..33df06a2de13a 100644 --- a/drivers/net/ethernet/ti/am65-cpsw-nuss.c +++ b/drivers/net/ethernet/ti/am65-cpsw-nuss.c @@ -2549,6 +2549,8 @@ static void am65_cpsw_unregister_devlink(struct am65_cpsw_common *common) static int am65_cpsw_nuss_register_ndevs(struct am65_cpsw_common *common) { + struct am65_cpsw_rx_chn *rx_chan = &common->rx_chns; + struct am65_cpsw_tx_chn *tx_chan = common->tx_chns; struct device *dev = common->dev; struct devlink_port *dl_port; struct am65_cpsw_port *port; @@ -2567,6 +2569,22 @@ static int am65_cpsw_nuss_register_ndevs(struct am65_cpsw_common *common) return ret; } + /* The DMA Channels are not guaranteed to be in a clean state. + * Reset and disable them to ensure that they are back to the + * clean state and ready to be used. + */ + for (i = 0; i < common->tx_ch_num; i++) { + k3_udma_glue_reset_tx_chn(tx_chan[i].tx_chn, &tx_chan[i], + am65_cpsw_nuss_tx_cleanup); + k3_udma_glue_disable_tx_chn(tx_chan[i].tx_chn); + } + + for (i = 0; i < AM65_CPSW_MAX_RX_FLOWS; i++) + k3_udma_glue_reset_rx_chn(rx_chan->rx_chn, i, rx_chan, + am65_cpsw_nuss_rx_cleanup, !!i); + + k3_udma_glue_disable_rx_chn(rx_chan->rx_chn); + ret = am65_cpsw_nuss_register_devlink(common); if (ret) return ret; -- 2.43.0