From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from madrid.collaboradmins.com (madrid.collaboradmins.com [46.235.227.194]) (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 8B6D66AB7; Tue, 2 Jan 2024 09:31:52 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=collabora.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=collabora.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=collabora.com header.i=@collabora.com header.b="hC5jvCVa" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=collabora.com; s=mail; t=1704187910; bh=GS1ilAjGtQe9kYt0ZI0ljTUErP/Rc2UM30xX6zpBUl0=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=hC5jvCVas/Ki5j2R6EMxqy8XF1AZwdw0WBI++dRQdLK8BF7Czcj+1Mk/pg2Q5D0V9 3aRpZnVS/OU9GI2ZFp6vGxtsykLR7XHYgG9ap6SRWHOhD9Mos/KDykGIZ5y9GAtaka syEVvz0ceeDCbtkfyAfbRumHjHIfklYBmzWxKf7Y6n7U3g8Zs6znpMdKmnLfMK6Z0O ZlxeH7ysuRCuY2rU45gJm21/abxJCWBxqv2TFxVBSRi+uvopFMpOm86kR99IXURS9X d6Igr+QeM6FYjxbm30Kf4s4FHJ3YwmxFisRHKB1PQPHUkVY48A/bYgOgWbyT74vYG5 u245MsWFF5YDA== Received: from [100.113.186.2] (cola.collaboradmins.com [195.201.22.229]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) (Authenticated sender: kholk11) by madrid.collaboradmins.com (Postfix) with ESMTPSA id 8122737813DB; Tue, 2 Jan 2024 09:31:49 +0000 (UTC) Message-ID: Date: Tue, 2 Jan 2024 10:31:48 +0100 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4 1/3] dt-bindings: usb: mtk-xhci: add a property for Gen1 isoc-in transfer issue Content-Language: en-US To: Chunfeng Yun , Greg Kroah-Hartman , Rob Herring , Krzysztof Kozlowski Cc: Conor Dooley , Matthias Brugger , Mathias Nyman , linux-usb@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Eddie Hung , Macpaul Lin References: <20231227060316.8539-1-chunfeng.yun@mediatek.com> From: AngeloGioacchino Del Regno In-Reply-To: <20231227060316.8539-1-chunfeng.yun@mediatek.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Il 27/12/23 07:03, Chunfeng Yun ha scritto: > 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 > bulk transfer. > > Signed-off-by: Chunfeng Yun Reviewed-by: AngeloGioacchino Del Regno