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Thu, 05 Nov 2026 07:41:27 -0800 (PST) Received: from [192.168.226.1] ([178.235.128.140]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-6b55ac94e8bsm1729432a12.35.2026.11.05.07.41.25 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 05 Nov 2026 07:41:26 -0800 (PST) Message-ID: Date: Thu, 5 Nov 2026 16:41:24 +0100 X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2] usb: dwc3: Update nominal max votes for qcom usb To: Akash Kumar , Greg Kroah-Hartman , Bjorn Andersson , Konrad Dybcio , Rob Herring , Dmitry Baryshkov , Krzysztof Kozlowski , Conor Dooley Cc: linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org References: <20261105100626.2003771-1-akash.kumar@oss.qualcomm.com> Content-Language: en-US From: Konrad Dybcio In-Reply-To: <20261105100626.2003771-1-akash.kumar@oss.qualcomm.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Proofpoint-Spam-Info: AW1haW4tMjYxMTA1MDA2MiBTYWx0ZWRfXxuICKFJwmDQF nf1poo1yIkU23R/pZyoxK5Pz2cDkFGCOVHfTbSzXvYl3hrACelHYn72uxzmBrh9S1mnScfDWkpn gVcveOKuWI32djJf951TgKDVisJstLU= X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMTA1MDA2MiBTYWx0ZWRfXy+x2oJ4WRdaL dxnNm2dbvn6eYtMvTnV1OK+W5ahGfNsD46zTiNirTUBmz0Qu+sVzrT/21VPMTNZpmXVxMnIR1WD B++M2eUnzLlpl+qqNZOnW21WsBeSnvsZUlD2GBDV2u0LAZe7I4cMooXmhn+EzcvYw3cnbPqVwXp sk3hVO5XTsbN9JPHAFCzjk5w0Fomy4thNWEGXSGURGiq7Y/kPBAI+r8y5K5BB4s7xI/1sTH/Ex/ mJzvc7eWXSzjFfQbf6mtDCfSSTD8UQ1eFWLU19EJXBniv5FZCMTf+GtDrIWR4xgmO1q8DSI6XVh WjvUqN6ayrsOAiNGTTXERQJ7cJKyufiyLDNkrmEgndBABdi7lCKWjC5cjGz8b+U0pD8thKuJZnA 6mJN/TSn51o+0/W1NCf35szxHZOpbwbyW8jez99R7wZDLdPoWJcFn8bFipnnUVPmhk0k7W3bMRn cOEUhk3Kf/9SRI1uaGw== X-Proofpoint-ORIG-GUID: 8MmzENsWaE_bkU0Lc0rk-oIDxyCmdBv- X-Proofpoint-GUID: 8MmzENsWaE_bkU0Lc0rk-oIDxyCmdBv- X-Authority-Analysis: v=2.4 cv=Y5JtIReN c=1 sm=1 tr=0 ts=6aeca3a9 cx=c_pps a=qKBjSQ1v91RyAK45QCPf5w==:117 a=PRfkaYvzSr8QmIIGAkY2Sg==:17 a=IkcTkHD0fZMA:10 a=zJRp6_cAMcgA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=eoimf2acIAo5FJnRuUoq:22 a=3XAOltBAYhvOEWtE0EsA:9 a=QEXdDO2ut3YA:10 a=NFOGd7dJGGMPyQGDc5-O:22 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.138,FMLib:17.12.100.49 definitions=2026-11-05_04,2026-11-04_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 adultscore=0 impostorscore=0 priorityscore=1501 bulkscore=0 suspectscore=0 clxscore=1015 lowpriorityscore=0 phishscore=0 spamscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2610300000 definitions=main-2611050062 On 11/5/26 11:02 AM, Akash Kumar wrote: > Increase the nominal max USB memory bandwidth vote to let DDR scale > higher within its nominal corner, fixing glitches seen during > simultaneous USB audio use cases. > > USB_MEMORY_PEAK_SS_BW is raised from 2500 MB/s to 4500 MB/s (+2000 > MB/s, ~1.8x). This ICC vote does not by itself determine DDR Can we scale this depending of the real speed of the connected device adjusted for the real data throughput? i.e. if we walk the tree and min/max as appropriate, we end up with say 10G wire speed, out of which we can shave off some static overhead 4500 MB/s is 36 Gb/s which is way beyond what USB3 can do, in any configuration. Konrad