From nobody Tue Nov 26 18:20:00 2024 Received: from mx0b-0031df01.pphosted.com (mx0b-0031df01.pphosted.com [205.220.180.131]) (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 5150A15C147; Wed, 16 Oct 2024 11:19:35 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=205.220.180.131 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729077577; cv=none; b=DnDUID4xAQgf0OOD6zPuA8KmOtjKSr6FEfAintZXd4p9ghsiyXyGjqRNZNlW5qBWB44MExqk1KeMssPqveI2qrAFRsALtA72qgEJbOR+Z6fUIGmvAVutPd/O1ZW2V0yoM14P6QhMrK8ZEMkfLRRomOv5oujqBdyEybcPrayco+U= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729077577; c=relaxed/simple; bh=FVtPvUPf+eIervD2QjqfFImVj/2vV5aXuTQ4YdK4MKY=; h=From:To:CC:Subject:Date:Message-ID:MIME-Version:Content-Type; b=udbpgkoPYqKLpp1bvU+fYqTMxebIteLmUU3Jd9ge7VmlMe9UQFtdI+OQZr8eoUZdaS2htUP4dwbH/HDwfaRFUyRN/bvcmb/NUj7iMIo9+0IFnMdeyNAXPEip92BUvjJbt+eSegULsVE4m5V6Qs1ba2MdUWtXMgk/Z/RAmbtBK3A= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=quicinc.com; spf=pass smtp.mailfrom=quicinc.com; dkim=pass (2048-bit key) header.d=quicinc.com header.i=@quicinc.com header.b=fEZ0jHwO; arc=none smtp.client-ip=205.220.180.131 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=quicinc.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=quicinc.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=quicinc.com header.i=@quicinc.com header.b="fEZ0jHwO" Received: from pps.filterd (m0279870.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.18.1.2/8.18.1.2) with ESMTP id 49GAIHZw011617; Wed, 16 Oct 2024 11:19:27 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=quicinc.com; h= cc:content-transfer-encoding:content-type:date:from:message-id :mime-version:subject:to; s=qcppdkim1; bh=qMP0Mu8JZbyT1a4ltNfBCk sjG5mXh/8pQFvUu3S9POs=; b=fEZ0jHwOPCfFzHkhHqe4D8l+cdJ+qXtUbv5HDh 53hVnWZJcT/cJaCSmEMD7iv80jleYJXOO4kx7TQaDnGk8Ju4RjRtv/a5TnaYjHhG x8yyMA5wYKYWbL/W+GxtqBeJg9wb2Q0WhqySYXy2aVjuWYMNz6vDcA6SiAO6/lQf 8aijaAMyAXXSuMDEYuMk5/L8vISLElDIGAZriYiQPF49XwO/equEA7zxEs+B16C4 JVqyRAk1o2F6dNi/dvaAOtjBHLcaw2Fgin/iDYqky3CebboM/aySE58dGmWlUHEV IDfuokQDeM61tM6zOtkqXA/Vx+XJpVFI72pJl8Cn2xE6CXqw== Received: from nasanppmta02.qualcomm.com (i-global254.qualcomm.com [199.106.103.254]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 42abm5g5c3-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 16 Oct 2024 11:19:27 +0000 (GMT) Received: from nasanex01a.na.qualcomm.com (nasanex01a.na.qualcomm.com [10.52.223.231]) by NASANPPMTA02.qualcomm.com (8.18.1.2/8.18.1.2) with ESMTPS id 49GBJQw5003553 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 16 Oct 2024 11:19:26 GMT Received: from hu-akakum-hyd.qualcomm.com (10.80.80.8) by nasanex01a.na.qualcomm.com (10.52.223.231) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.9; Wed, 16 Oct 2024 04:19:18 -0700 From: Akash Kumar To: Thinh Nguyen , Greg Kroah-Hartman , Jing Leng , Felipe Balbi , Jack Pham , , Wesley Cheng , Laurent Pinchart , Daniel Scally CC: Vijayavardhan Vennapusa , Krishna Kurapati , , , Akash Kumar Subject: [PATCH v6] usb: dwc3: gadget: Refine the logic for resizing Tx FIFOs Date: Wed, 16 Oct 2024 16:49:04 +0530 Message-ID: <20241016111904.11375-1-quic_akakum@quicinc.com> X-Mailer: git-send-email 2.17.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: nasanex01a.na.qualcomm.com (10.52.223.231) To nasanex01a.na.qualcomm.com (10.52.223.231) X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-ORIG-GUID: qIIjMZ7WK2Q7GbA-_AmQiRXRQUIEj6KM X-Proofpoint-GUID: qIIjMZ7WK2Q7GbA-_AmQiRXRQUIEj6KM X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1039,Hydra:6.0.680,FMLib:17.12.60.29 definitions=2024-09-06_09,2024-09-06_01,2024-09-02_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 adultscore=0 clxscore=1011 impostorscore=0 mlxscore=0 bulkscore=0 suspectscore=0 lowpriorityscore=0 phishscore=0 priorityscore=1501 spamscore=0 mlxlogscore=999 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2409260000 definitions=main-2410160070 The current logic is rigid, setting num_fifos to fixed values. 3 for any maxburst greater than 1. tx_fifo_resize_max_num for maxburst greater than 6. Additionally, it did not differentiate much between bulk and isochronous transfers, applying similar logic to both. The updated logic is more flexible and specifically designed to meet the unique requirements of both bulk and isochronous transfers. We have made every effort to satisfy all needs and requirements, verified on our specific platform and application. Bulk Transfers: Ensures that num_fifos is optimized by considering both the maxburst and DT property "tx-fifo-max-num" for super speed and above. For high-speed and below bulk endpoints, a 2K TxFIFO allocation is used to meet efficient data transfer needs, considering FIFO-constrained platforms. Isochronous Transfers: Ensures that num_fifos is sufficient by considering the maximum packet multiplier for HS and below and maxburst for Super-speed and above eps, along with a constraint with the DT property "tx-fifo-max-num". This change aims to optimize the allocation of Tx FIFOs for both bulk and isochronous endpoints, potentially improving data transfer efficiency and overall performance. It also enhances support for all use cases, which can be tweaked with DT parameters and the endpoint=E2=80=99s maxburst= and maxpacket. This structured approach ensures that the appropriate number of FIFOs is allocated based on the endpoint type and USB speed. Signed-off-by: Akash Kumar --- Changes for v6: The code has been refactored to replace multiple if checks with a switch-case structure based on the USB speed. This change improves readability and maintainability by clearly defining behavior for different USB speeds. This structured approach ensures that the appropriate number of FIFOs is allocated based on the endpoint type and USB speed. Changes for v5: Update Calculation for HS and below bulk and isoc eps based on suggestion and fixed at 2k for bulk eps considering fifo constrained platforms. Changes for v4: Updated commit message as per review comments to clarify that it has been tested on specific platforms only and tried best to match all expectations. Changes for v3: Redefine logic for resizing tx fifos,added check based on operating speed and used maxp for HS and maxburst for SS and defined max allocation based on dt property. Changes for v2: Redefine logic for resizing tx fifos, handled fifo based on minimum of maxp and maxburts. Changes for v1: Added additional condition to allocate tx fifo for hs isoc eps, keeping the other resize logic same --- drivers/usb/dwc3/gadget.c | 31 +++++++++++++++++++++++-------- 1 file changed, 23 insertions(+), 8 deletions(-) diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c index 10178e5eda5a..dc62d0626e53 100644 --- a/drivers/usb/dwc3/gadget.c +++ b/drivers/usb/dwc3/gadget.c @@ -771,15 +771,30 @@ static int dwc3_gadget_resize_tx_fifos(struct dwc3_ep= *dep) =20 ram1_depth =3D DWC3_RAM1_DEPTH(dwc->hwparams.hwparams7); =20 - if ((dep->endpoint.maxburst > 1 && - usb_endpoint_xfer_bulk(dep->endpoint.desc)) || + switch (dwc->gadget->speed) { + case USB_SPEED_SUPER_PLUS: + case USB_SPEED_SUPER: + if (usb_endpoint_xfer_bulk(dep->endpoint.desc) || usb_endpoint_xfer_isoc(dep->endpoint.desc)) - num_fifos =3D 3; - - if (dep->endpoint.maxburst > 6 && - (usb_endpoint_xfer_bulk(dep->endpoint.desc) || - usb_endpoint_xfer_isoc(dep->endpoint.desc)) && DWC3_IP_IS(DWC31)) - num_fifos =3D dwc->tx_fifo_resize_max_num; + num_fifos =3D min_t(unsigned int, + dep->endpoint.maxburst, + dwc->tx_fifo_resize_max_num); + break; + case USB_SPEED_HIGH: + if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) { + num_fifos =3D min_t(unsigned int, + usb_endpoint_maxp_mult(dep->endpoint.desc) + 1, + dwc->tx_fifo_resize_max_num); + break; + } + fallthrough; + case USB_SPEED_FULL: + if (usb_endpoint_xfer_bulk(dep->endpoint.desc)) + num_fifos =3D 2; + break; + default: + break; + } =20 /* FIFO size for a single buffer */ fifo =3D dwc3_gadget_calc_tx_fifo_size(dwc, 1); --=20 2.17.1