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[103.229.18.19]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2d37c48042fsm4358025ad.55.2026.08.12.22.44.20 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 12 Aug 2026 22:44:24 -0700 (PDT) Message-ID: Date: Thu, 13 Aug 2026 11:14:19 +0530 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] arm64: dts: qcom: glymur: Mark USB controllers dma-coherent To: Greg Ociepka , Bjorn Andersson , Konrad Dybcio , Rob Herring , Krzysztof Kozlowski , Conor Dooley Cc: Krishna Kurapati , Abel Vesa , Wesley Cheng , linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org References: <20260812154014.123315-1-greg@ferrisoft.com> Content-Language: en-US From: Gopikrishna Garmidi In-Reply-To: <20260812154014.123315-1-greg@ferrisoft.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Authority-Analysis: v=2.4 cv=ZcQt8MVA c=1 sm=1 tr=0 ts=6a7d59ba cx=c_pps a=IZJwPbhc+fLeJZngyXXI0A==:117 a=Ou0eQOY4+eZoSc0qltEV5Q==:17 a=IkcTkHD0fZMA:10 a=Sv0fKeRqtYgA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=DJpcGTmdVt4CTyJn9g5Z:22 a=VwQbUJbxAAAA:8 a=EUspDBNiAAAA:8 a=a8UEx8NLAAAA:8 a=i1Pha25J8sJlEzR877YA:9 a=QEXdDO2ut3YA:10 a=uG9DUKGECoFWVXl0Dc02:22 a=-yeuc7zBjbfZT8aiaP-D:22 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwODEzMDAzNyBTYWx0ZWRfX2PsmmoUPJS5r mtqQr9Y8IwpRFjtW946x9h8Xva3NpqjmsWAZr4r3ZQVJw+gw4VLdBF8n/C9/U8ZVO+MTCeZnj4t kL1tU/J7exFyNcJT887PDBFjmXe0y4P/KD3rCceS0v1vJKEeBEKVHZzIyDp37GhG0+hE3XBJMHu RYCEQia1t4yLLfZchjARieVmQYwvYgRJIGdAwq8fFcQqKBf+2KofRwvN2AK4jXHg4uop7z0ap5k v/Pxxm0pJZmFYJIgVrmpLaQZw0JzP+hDNcAODE2EqIktmRMmbbvUDk2xoMGwQpuDClLrNkaNJDk uA7M7kD3rV2uKgegHuz42yj4GNm4YL3FPrtesp8xTIRJqk9dWURvBKP7mIgfSDyhrg0Bc24ydsv Xu6rhzfoH78prnQRgJpC1aBOBs35N4yWY40JlLLyRjnlwz4AtDQmVzaV0733wS7DiQGLWWUzyQb bpujRxGGoto8ATZsUZA== X-Proofpoint-ORIG-GUID: moh2zVDg4O3ZFUG2zR54pg5AVNofyky8 X-Proofpoint-Spam-Info: AW1haW4tMjYwODEzMDAzNyBTYWx0ZWRfX3e+MApYT/xFl K7zkP2L+NAe5Y/EoCQtJJDn6uILUZdPKsMyAi5bxTmc38ixtAIygZD3E8n+df1OhpD7ktyVvyms 7I36WDEqBKpvBbfw2PgAW1p9s0py+3w= X-Proofpoint-GUID: moh2zVDg4O3ZFUG2zR54pg5AVNofyky8 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-08-13_02,2026-08-12_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 impostorscore=0 phishscore=0 malwarescore=0 suspectscore=0 adultscore=0 bulkscore=0 priorityscore=1501 spamscore=0 lowpriorityscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2608130037 On 8/12/2026 9:10 PM, Greg Ociepka wrote: > All five USB controller nodes on Glymur (usb_0, usb_1, usb_2, usb_hs, > usb_mp) are missing the dma-coherent property, which Hamoa carries on > all of its USB controllers. Krishna Kurapati confirmed the Glymur USB > controllers are dma-coherent [1]. > > Without the property the kernel treats USB DMA buffers as non-coherent > and performs cache maintenance on every transfer, which coherent > hardware makes redundant. > > Follow-up to the clock/power/bandwidth votes patch [2], kept separate > so the already-reviewed patch stands as is. > > Tested on an Asus Zenbook A16 (UX3607OA): all controllers enumerate > their devices as before and a 64 MiB write plus two O_DIRECT > read-backs over USB mass storage produce identical checksums. > > [1] https://lore.kernel.org/linux-arm-msm/f92cc91e-6e5c-4375-aaa6-f079a165f4b5@oss.qualcomm.com/ > [2] https://lore.kernel.org/linux-arm-msm/20260812083522.774711-1-greg@ferrisoft.com/ > > Fixes: 4eee57dd4df9 ("arm64: dts: qcom: glymur: Add USB related nodes") > Signed-off-by: Greg Ociepka > Assisted-by: Claude:fable-5 Reviewed-by: Gopikrishna Garmidi