From patchwork Wed Apr 12 21:11:13 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sean Wang X-Patchwork-Id: 13209518 X-Patchwork-Delegate: nbd@nbd.name 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 85DC9C77B6C for ; Wed, 12 Apr 2023 21:11:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229882AbjDLVLb (ORCPT ); Wed, 12 Apr 2023 17:11:31 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43012 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229508AbjDLVLa (ORCPT ); Wed, 12 Apr 2023 17:11:30 -0400 Received: from mailgw02.mediatek.com (unknown [210.61.82.184]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3A0A25244 for ; Wed, 12 Apr 2023 14:11:24 -0700 (PDT) X-UUID: 90c0808ad97611edb6b9f13eb10bd0fe-20230413 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=mediatek.com; s=dk; h=Content-Type:MIME-Version:Message-ID:Date:Subject:CC:To:From; bh=6iPzu4QBWcByH9FGPjim3d7yOHAS/pFIOUEMtPHZ+BI=; b=P5elrN/3cD4wbBEss6NEZeWOkybOoos2wxSc9M0zl/7CK/1rHkAHeitUZIbv2oceIn0Q+A1Wlxe1GZZJXpK0kM7vnPWq1FwdaQpvouNBTyviKG3+2iZj8QlTJ+DggExY2dVofqksRO5OY26Dhdv+xEXJRZnp2vmYhWlMhOItjF8=; X-CID-P-RULE: Release_Ham X-CID-O-INFO: VERSION:1.1.22,REQID:c495ade6-9a4e-45bf-90e4-8c56d94ef428,IP:0,U RL:0,TC:0,Content:-5,EDM:0,RT:0,SF:95,FILE:0,BULK:0,RULE:Release_Ham,ACTIO N:release,TS:90 X-CID-INFO: VERSION:1.1.22,REQID:c495ade6-9a4e-45bf-90e4-8c56d94ef428,IP:0,URL :0,TC:0,Content:-5,EDM:0,RT:0,SF:95,FILE:0,BULK:0,RULE:Spam_GS981B3D,ACTIO N:quarantine,TS:90 X-CID-META: VersionHash:120426c,CLOUDID:d33cc2ea-db6f-41fe-8b83-13fe7ed1ef52,B ulkID:2304130511191UJ11P9I,BulkQuantity:0,Recheck:0,SF:29|28|17|19|48|38,T C:nil,Content:0,EDM:-3,IP:nil,URL:11|1,File:nil,Bulk:nil,QS:nil,BEC:nil,CO L:0,OSI:0,OSA:0,AV:0 X-CID-BVR: 0 X-CID-BAS: 0,_,0,_ X-UUID: 90c0808ad97611edb6b9f13eb10bd0fe-20230413 Received: from mtkmbs13n1.mediatek.inc [(172.21.101.193)] by mailgw02.mediatek.com (envelope-from ) (Generic MTA with TLSv1.2 ECDHE-RSA-AES256-GCM-SHA384 256/256) with ESMTP id 518620744; Thu, 13 Apr 2023 05:11:17 +0800 Received: from mtkmbs13n1.mediatek.inc (172.21.101.193) by mtkmbs11n2.mediatek.inc (172.21.101.187) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.25; Thu, 13 Apr 2023 05:11:16 +0800 Received: from mtkswgap22.mediatek.inc (172.21.77.33) by mtkmbs13n1.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.2.1118.25 via Frontend Transport; Thu, 13 Apr 2023 05:11:16 +0800 From: To: , CC: , , , , , , , , , , , , , , , , , , , , , , , Quan Zhou , Deren Wu , Wang Zhao Subject: [PATCH v2 1/2] wifi: mt76: mt7921e: improve reliability of dma reset Date: Thu, 13 Apr 2023 05:11:13 +0800 Message-ID: X-Mailer: git-send-email 1.7.9.5 MIME-Version: 1.0 X-MTK: N Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org From: Quan Zhou The hardware team has advised the driver that it is necessary to first put WFDMA into an idle state before resetting the WFDMA. Otherwise, the WFDMA may enter an unknown state where it cannot be polled with the right state successfully. To ensure that the DMA can work properly while a stressful cold reboot test was being made, we have reordered the programming sequence in the driver based on the hardware team's guidance. The patch would modify the WFDMA disabling flow from "DMA reset -> disabling DMASHDL -> disabling WFDMA -> polling and waiting until DMA idle" to "disabling WFDMA -> polling and waiting for DMA idle -> disabling DMASHDL -> DMA reset. Where he polling and waiting until WFDMA is idle is coordinated with the operation of disabling WFDMA. Even while WFDMA is being disabled, it can still handle Tx/Rx requests. The additional polling allows sufficient time for WFDMA to process the last T/Rx request. When the idle state of WFDMA is reached, it is a reliable indication that DMASHDL is also idle to ensure it is safe to disable it and perform the DMA reset. Fixes: 0a1059d0f060 ("mt76: mt7921: move mt7921_dma_reset in dma.c") Co-developed-by: Sean Wang Signed-off-by: Sean Wang Co-developed-by: Deren Wu Signed-off-by: Deren Wu Co-developed-by: Wang Zhao Signed-off-by: Wang Zhao Signed-off-by: Quan Zhou --- v2: update the commit message to ensure that it is consistent between the patch content and the documentation. This will help to accurately reflect the changes made and make it easier for other developers to understand the purpose of the update. --- .../net/wireless/mediatek/mt76/mt7921/dma.c | 36 ++++++++++--------- 1 file changed, 20 insertions(+), 16 deletions(-) diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/dma.c b/drivers/net/wireless/mediatek/mt76/mt7921/dma.c index d1f10f6d9adc..cf844224d618 100644 --- a/drivers/net/wireless/mediatek/mt76/mt7921/dma.c +++ b/drivers/net/wireless/mediatek/mt76/mt7921/dma.c @@ -66,22 +66,6 @@ static void mt7921_dma_prefetch(struct mt7921_dev *dev) static int mt7921_dma_disable(struct mt7921_dev *dev, bool force) { - if (force) { - /* reset */ - mt76_clear(dev, MT_WFDMA0_RST, - MT_WFDMA0_RST_DMASHDL_ALL_RST | - MT_WFDMA0_RST_LOGIC_RST); - - mt76_set(dev, MT_WFDMA0_RST, - MT_WFDMA0_RST_DMASHDL_ALL_RST | - MT_WFDMA0_RST_LOGIC_RST); - } - - /* disable dmashdl */ - mt76_clear(dev, MT_WFDMA0_GLO_CFG_EXT0, - MT_WFDMA0_CSR_TX_DMASHDL_ENABLE); - mt76_set(dev, MT_DMASHDL_SW_CONTROL, MT_DMASHDL_DMASHDL_BYPASS); - /* disable WFDMA0 */ mt76_clear(dev, MT_WFDMA0_GLO_CFG, MT_WFDMA0_GLO_CFG_TX_DMA_EN | MT_WFDMA0_GLO_CFG_RX_DMA_EN | @@ -95,6 +79,22 @@ static int mt7921_dma_disable(struct mt7921_dev *dev, bool force) MT_WFDMA0_GLO_CFG_RX_DMA_BUSY, 0, 1000)) return -ETIMEDOUT; + /* disable dmashdl */ + mt76_clear(dev, MT_WFDMA0_GLO_CFG_EXT0, + MT_WFDMA0_CSR_TX_DMASHDL_ENABLE); + mt76_set(dev, MT_DMASHDL_SW_CONTROL, MT_DMASHDL_DMASHDL_BYPASS); + + if (force) { + /* reset */ + mt76_clear(dev, MT_WFDMA0_RST, + MT_WFDMA0_RST_DMASHDL_ALL_RST | + MT_WFDMA0_RST_LOGIC_RST); + + mt76_set(dev, MT_WFDMA0_RST, + MT_WFDMA0_RST_DMASHDL_ALL_RST | + MT_WFDMA0_RST_LOGIC_RST); + } + return 0; } @@ -301,6 +301,10 @@ void mt7921_dma_cleanup(struct mt7921_dev *dev) MT_WFDMA0_GLO_CFG_OMIT_RX_INFO | MT_WFDMA0_GLO_CFG_OMIT_RX_INFO_PFET2); + mt76_poll_msec_tick(dev, MT_WFDMA0_GLO_CFG, + MT_WFDMA0_GLO_CFG_TX_DMA_BUSY | + MT_WFDMA0_GLO_CFG_RX_DMA_BUSY, 0, 100, 1); + /* reset */ mt76_clear(dev, MT_WFDMA0_RST, MT_WFDMA0_RST_DMASHDL_ALL_RST | From patchwork Wed Apr 12 21:11:14 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sean Wang X-Patchwork-Id: 13209519 X-Patchwork-Delegate: nbd@nbd.name 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7BACCC77B6E for ; Wed, 12 Apr 2023 21:11:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229960AbjDLVLc (ORCPT ); Wed, 12 Apr 2023 17:11:32 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43020 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229894AbjDLVLb (ORCPT ); Wed, 12 Apr 2023 17:11:31 -0400 Received: from mailgw02.mediatek.com (unknown [210.61.82.184]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 055A05249 for ; Wed, 12 Apr 2023 14:11:26 -0700 (PDT) X-UUID: 921c42acd97611edb6b9f13eb10bd0fe-20230413 DKIM-Signature: v=1; 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Thu, 13 Apr 2023 05:11:19 +0800 Received: from mtkmbs13n1.mediatek.inc (172.21.101.193) by mtkmbs13n2.mediatek.inc (172.21.101.108) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.25; Thu, 13 Apr 2023 05:11:18 +0800 Received: from mtkswgap22.mediatek.inc (172.21.77.33) by mtkmbs13n1.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.2.1118.25 via Frontend Transport; Thu, 13 Apr 2023 05:11:18 +0800 From: To: , CC: , , , , , , , , , , , , , , , , , , , , , , , Quan Zhou , Deren Wu , Wang Zhao Subject: [PATCH v2 2/2] wifi: mt76: mt7921e: stop chip reset worker in unregister hook Date: Thu, 13 Apr 2023 05:11:14 +0800 Message-ID: X-Mailer: git-send-email 1.7.9.5 In-Reply-To: References: MIME-Version: 1.0 X-MTK: N Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org From: Quan Zhou If the chip reset worker is triggered during the remove process, the chip DMA may not be properly pushed back to the idle state. This can lead to corruption of the DMA flow due to the chip reset. Therefore, it is necessary to stop the chip reset before the DMA is finalized. To avoid resetting the chip after the reset worker is cancelled, use __mt7921_mcu_drv_pmctrl() instead of mt7921_mcu_drv_pmctrl(). It is safe to ignore the pm mutex because the pm worker and wake worker have already been cancelled. Fixes: 033ae79b3830 ("mt76: mt7921: refactor init.c to be bus independent") Co-developed-by: Sean Wang Signed-off-by: Sean Wang Co-developed-by: Deren Wu Signed-off-by: Deren Wu Co-developed-by: Wang Zhao Signed-off-by: Wang Zhao Signed-off-by: Quan Zhou --- v2: update the commit message to ensure that it is consistent between the patch content and the documentation. This will help to accurately reflect the changes made and make it easier for other developers to understand the purpose of the update. --- drivers/net/wireless/mediatek/mt76/mt7921/pci.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/pci.c b/drivers/net/wireless/mediatek/mt76/mt7921/pci.c index 1a8a54a46dcc..c592903157d0 100644 --- a/drivers/net/wireless/mediatek/mt76/mt7921/pci.c +++ b/drivers/net/wireless/mediatek/mt76/mt7921/pci.c @@ -115,9 +115,10 @@ static void mt7921e_unregister_device(struct mt7921_dev *dev) napi_disable(&dev->mt76.napi[i]); cancel_delayed_work_sync(&pm->ps_work); cancel_work_sync(&pm->wake_work); + cancel_work_sync(&dev->reset_work); mt7921_tx_token_put(dev); - mt7921_mcu_drv_pmctrl(dev); + __mt7921_mcu_drv_pmctrl(dev); mt7921_dma_cleanup(dev); mt7921_wfsys_reset(dev); skb_queue_purge(&dev->mt76.mcu.res_q);