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Fri, 24 Jul 2026 04:38:25 -0700 (PDT) X-Received: by 2002:a05:6300:501:10b0:3c6:61c6:8970 with SMTP id adf61e73a8af0-3c661c6a2dcmr1754069637.14.1784893104787; Fri, 24 Jul 2026 04:38:24 -0700 (PDT) Received: from [192.168.0.173] ([49.205.251.199]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-3147dc9f2f0sm31490699eec.13.2026.07.24.04.38.19 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 24 Jul 2026 04:38:24 -0700 (PDT) Message-ID: <652d6819-993f-4b10-bbbd-635c9b785e98@oss.qualcomm.com> Date: Fri, 24 Jul 2026 17:08:17 +0530 Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [RFC PATCH 01/11] dt-bindings: media: qcom,sm8550-iris: Add vpu sub nodes To: Dmitry Baryshkov Cc: Dikshita Agarwal , Abhinav Kumar , Bryan O'Donoghue , Mauro Carvalho Chehab , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Bjorn Andersson , Konrad Dybcio , linux-media@vger.kernel.org, linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Vishnu Reddy References: <20260709-vpu_iommu_iova_handling-v1-0-72bb62cb2dfd@oss.qualcomm.com> <20260709-vpu_iommu_iova_handling-v1-1-72bb62cb2dfd@oss.qualcomm.com> Content-Language: en-US From: Vikash Garodia In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Proofpoint-Spam-Info: AW1haW4tMjYwNzI0MDEwNSBTYWx0ZWRfX8hmviQPN9nru 7X/muyazF8S2HiGuIVmA9AXXliz+ILjm3HioLKXManXvGAycC9N5UCYyWYIGqCqGLH0qHYE/PWm IkXtovrUYZy68iAsZOTShAsN/f//vq4= X-Authority-Analysis: v=2.4 cv=Rtz16imK c=1 sm=1 tr=0 ts=6a634eb2 cx=c_pps a=Qgeoaf8Lrialg5Z894R3/Q==:117 a=Am0+rXbGVt9FyytbsJdRwA==:17 a=IkcTkHD0fZMA:10 a=RAioF0-LDSMA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=rJkE3RaqiGZ5pbrm-msn:22 a=e5mUnYsNAAAA:8 a=EUspDBNiAAAA:8 a=MZGBJN6z8D9sCzpjJ74A:9 a=QEXdDO2ut3YA:10 a=x9snwWr2DeNwDh03kgHS:22 a=Vxmtnl_E_bksehYqCbjh:22 X-Proofpoint-GUID: qpPyq1ZOz_gpwdN5K0oRqiqpLHMcRemh X-Proofpoint-ORIG-GUID: qpPyq1ZOz_gpwdN5K0oRqiqpLHMcRemh X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNzI0MDEwNSBTYWx0ZWRfX27nSiAs7UNsM PK6S/tFBkRSPI5qQ+TlHx0lUwPvkFHH/5mBc8/4r2rzDSblS8Y7k2V6TFl710jnOPuP+6SND2OK G8TulGtLaqH1n4IpsFCaEUVexJy+IFAtZS4TjwBg/WB3jkZDo34er9kU6Z5GZI8Q2aPfVhpOGZ8 Pbx4bS1I6MB4fXwgzEyp20s66ehwTwxv8e1QGQhXjYEb/RnMkxFCKHyZTwh0LYDCYGsmwgB6Wm9 TRrvTW4+S5bixHul+0/L3WUI1YMAM+nWucyiQKMxTyr7KwGM+KT4cnQeTFIvfHmEPl5r2hnK2KV 55WLWPS1HYqCdEel7ia5e6daJkT8Qnxcki/g4d5CZGDC6Uwwq3CWVFdF6BfeNAAH68Ld2QICQye H/l9SxVYxL6soHfEVa1wjJsybLkcS1Cl0f5MPcM1XzCJb87QuAumHLoZZGFD4fonZNdBltvLPeG uK6kOKAMz1z501gCRnQ== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-07-24_02,2026-07-22_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 phishscore=0 priorityscore=1501 suspectscore=0 lowpriorityscore=0 bulkscore=0 spamscore=0 malwarescore=0 clxscore=1015 adultscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2607240105 On 7/24/2026 4:45 PM, Dmitry Baryshkov wrote: > On Thu, Jul 09, 2026 at 06:05:47PM +0530, Vikash Garodia wrote: >> VPU hardwares have a limitation where VPU streams are associated with >> dedicated addressable address range, as illustrated below >> >> +-----------------------------------------------------------+ >> | Stream A reserved region (600 MB) | >> | 0x00000000 - 0x25800000 | >> +-----------------------------------------------------------+ >> | Stream B reserved region (3.5 GB) | >> | 0x00000000 - 0xe0000000 | >> +-----------------------------------------------------------+ >> | Other reserved regions | >> +-----------------------------------------------------------+ >> >> Mapping a stream outside its expected range can cause unintended >> behavior, including device crashes, as reported at: >> https://gitlab.freedesktop.org/drm/msm/-/work_items/100 >> >> To address this limitation, the subset of stream/s are now represented as >> sub nodes, so that they can be associated to the respective addressable >> range. >> The limitation could be exposed when running usecase like concurrent >> video sessions. The binding have been validated with higher concurrent >> sessions across the SOCs supported under this schema. >> >> Co-developed-by: Vishnu Reddy >> Signed-off-by: Vishnu Reddy >> Signed-off-by: Vikash Garodia >> --- >> .../bindings/media/qcom,sm8550-iris.yaml | 66 +++++++++++++++++++++- >> 1 file changed, 63 insertions(+), 3 deletions(-) >> >> + >> + firmware: > > Venus devices have been using 'video-firmware' here. Can we please use > that name? Or I'd ask differently: what is the reason for deviating from > the name that has already been used? > fair point. The primary reason was to keep it aligned with other subnodes (pixel/non-pixel) which does not have the video prefix. For firmware, it would be more appropriate to keep it same as defined earlier "video-firmware" >> + type: object >> + description: >> + Firmware context bank represents the firmware processing domain of the VPU. Required to boot >> + VPU when no hypervisor is present. >> + properties: >> + iommus: >> + maxItems: 1 >> + required: >> + - iommus >> + additionalProperties: false >> + >