From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mx01.omp.ru (mx01.omp.ru [90.154.21.10]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B03DC224F5; Wed, 27 Dec 2023 09:19:57 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=omp.ru Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=omp.ru Received: from [192.168.1.104] (178.176.74.67) by msexch01.omp.ru (10.188.4.12) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384) id 15.2.1258.12; Wed, 27 Dec 2023 12:19:42 +0300 Subject: Re: [PATCH v4 1/3] dt-bindings: usb: mtk-xhci: add a property for Gen1 isoc-in transfer issue To: Chunfeng Yun , Greg Kroah-Hartman , Rob Herring , Krzysztof Kozlowski , AngeloGioacchino Del Regno CC: Conor Dooley , Matthias Brugger , Mathias Nyman , , , , , , Eddie Hung , Macpaul Lin References: <20231227060316.8539-1-chunfeng.yun@mediatek.com> From: Sergey Shtylyov Organization: Open Mobile Platform Message-ID: <1e5772b3-2e71-069c-5794-ded2ee72222f@omp.ru> Date: Wed, 27 Dec 2023 12:19:42 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.10.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 In-Reply-To: <20231227060316.8539-1-chunfeng.yun@mediatek.com> Content-Type: text/plain; charset="utf-8" Content-Language: en-US Content-Transfer-Encoding: 7bit X-ClientProxiedBy: msexch01.omp.ru (10.188.4.12) To msexch01.omp.ru (10.188.4.12) X-KSE-ServerInfo: msexch01.omp.ru, 9 X-KSE-AntiSpam-Interceptor-Info: scan successful X-KSE-AntiSpam-Version: 6.1.0, Database issued on: 12/27/2023 08:58:14 X-KSE-AntiSpam-Status: KAS_STATUS_NOT_DETECTED X-KSE-AntiSpam-Method: none X-KSE-AntiSpam-Rate: 59 X-KSE-AntiSpam-Info: Lua profiles 182370 [Dec 27 2023] X-KSE-AntiSpam-Info: Version: 6.1.0.3 X-KSE-AntiSpam-Info: Envelope from: s.shtylyov@omp.ru X-KSE-AntiSpam-Info: LuaCore: 7 0.3.7 6d6bf5bd8eea7373134f756a2fd73e9456bb7d1a X-KSE-AntiSpam-Info: {rep_avail} X-KSE-AntiSpam-Info: {Tracking_from_domain_doesnt_match_to} X-KSE-AntiSpam-Info: {relay has no DNS name} X-KSE-AntiSpam-Info: {SMTP from is not routable} X-KSE-AntiSpam-Info: {Found in DNSBL: 178.176.74.67 in (user) b.barracudacentral.org} X-KSE-AntiSpam-Info: 127.0.0.199:7.1.2;d41d8cd98f00b204e9800998ecf8427e.com:7.1.1;178.176.74.67:7.1.2;omp.ru:7.1.1 X-KSE-AntiSpam-Info: ApMailHostAddress: 178.176.74.67 X-KSE-AntiSpam-Info: {DNS response errors} X-KSE-AntiSpam-Info: Rate: 59 X-KSE-AntiSpam-Info: Status: not_detected X-KSE-AntiSpam-Info: Method: none X-KSE-AntiSpam-Info: Auth:dmarc=temperror header.from=omp.ru;spf=temperror smtp.mailfrom=omp.ru;dkim=none X-KSE-Antiphishing-Info: Clean X-KSE-Antiphishing-ScanningType: Heuristic X-KSE-Antiphishing-Method: None X-KSE-Antiphishing-Bases: 12/27/2023 09:04:00 X-KSE-Antivirus-Interceptor-Info: scan successful X-KSE-Antivirus-Info: Clean, bases: 12/27/2023 6:29:00 AM X-KSE-Attachment-Filter-Triggered-Rules: Clean X-KSE-Attachment-Filter-Triggered-Filters: Clean X-KSE-BulkMessagesFiltering-Scan-Result: InTheLimit On 12/27/23 9:03 AM, Chunfeng Yun wrote: > For Gen1 isoc-in endpoint on controller before about SSUSB IPM v1.6.0, it > still send out unexpected ACK after receiving a short packet in burst > transfer, this will cause an exception on connected device, specially for > a 4k camera. > Add a quirk property "rx-fifo-depth" to work around this hardware issue, > prefer to use 3k bytes; > The side-effect is that may cause performance drop about 10%, including That it may cause? > bulk transfer. > > Signed-off-by: Chunfeng Yun > --- > v4: change rx-fifo size in bytes > v3: add fifo depth unit, change the value range from 0-3 to 1-4 > v2: change 'mediatek,rxfifo-depth' to 'rx-fifo-depth' > --- > .../devicetree/bindings/usb/mediatek,mtk-xhci.yaml | 11 +++++++++++ > 1 file changed, 11 insertions(+) > > diff --git a/Documentation/devicetree/bindings/usb/mediatek,mtk-xhci.yaml b/Documentation/devicetree/bindings/usb/mediatek,mtk-xhci.yaml > index e9644e333d78..9f621f2209df 100644 > --- a/Documentation/devicetree/bindings/usb/mediatek,mtk-xhci.yaml > +++ b/Documentation/devicetree/bindings/usb/mediatek,mtk-xhci.yaml > @@ -124,6 +124,17 @@ properties: > defined in the xHCI spec on MTK's controller. > default: 5000 > > + rx-fifo-depth: > + $ref: /schemas/types.yaml#/definitions/uint32 > + description: > + It is a quirk used to work around Gen1 isoc-in endpoint transfer issue > + that still send out unexpected ACK after device finish the burst transfer Finishes. > + with a short packet and cause an exception, specially on a 4K camera > + device, it happens on controller before about IPM v1.6.0; the side-effect > + is that may cause performance drop about 10%, include bulk transfer, That it may cause? And including? [...] MBR, Sergey