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[78.88.45.245]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-b76f59a6a74sm229597766b.45.2025.11.27.10.34.47 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 27 Nov 2025 10:34:48 -0800 (PST) Message-ID: Date: Thu, 27 Nov 2025 19:34:47 +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] media: venus: assign unique bus_info strings for encoder and decoder To: Jorge Ramirez Cc: vikash.garodia@oss.qualcomm.com, dikshita.agarwal@oss.qualcomm.com, bod@kernel.org, mchehab@kernel.org, linux-media@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org References: <20251121184306.218169-1-jorge.ramirez@oss.qualcomm.com> <249ccbbc-7990-43f0-b205-d5f33a1c9ad3@oss.qualcomm.com> <6eb8681d-d82e-457f-907d-3ba5b94267f2@oss.qualcomm.com> Content-Language: en-US From: Konrad Dybcio In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUxMTI3MDEzOSBTYWx0ZWRfX5k+BXKPvp9q1 UKbR4eGrhdWssuLMS0+ryIfJOk1dEtfAZCarfREtuAsz5OJmbWbISbSy59tS2LaTJfRlebmmC26 w004W15XtMsy5P+AAxHThQKBv1Tyr+LtlRq/dHNc4f1L+Lh+zG66NPJQwiPvfaxz/sGi/GO/u6J HlEEYN5RaHmTO1l/HIAFu/UqVUG/j3HoSPGXuNzjxAvXjgUBqOP6vU4J7ci+Shr7EFBykQ77WVh 966AWHAtGK+xyqSN96xfzAElOLdiQbjPnskN3Pj6JXfW8Z2atUwisRNtPCT2WYKdomMXQE9nQzX BeGBPNF2CtydHvacYqhVb3Mig1LaDqkXC7uLxAZLDfzgIGaQtdBqdxka1gaRcMUS1hf9hNS+V1J VvoWtCCufAvOZtK9jPfrZ5DPLIIIUg== X-Proofpoint-ORIG-GUID: wjdQI_z51EfPmuKHw79PV-ls6lCmZjFG X-Proofpoint-GUID: wjdQI_z51EfPmuKHw79PV-ls6lCmZjFG X-Authority-Analysis: v=2.4 cv=Lt6fC3dc c=1 sm=1 tr=0 ts=692899ca cx=c_pps a=EVbN6Ke/fEF3bsl7X48z0g==:117 a=FpWmc02/iXfjRdCD7H54yg==:17 a=IkcTkHD0fZMA:10 a=6UeiqGixMTsA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=EUspDBNiAAAA:8 a=bB1j1K4SiuvE0lrpVroA:9 a=QEXdDO2ut3YA:10 a=a_PwQJl-kcHnX1M80qC6:22 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.9,FMLib:17.12.100.49 definitions=2025-11-25_02,2025-11-27_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 malwarescore=0 lowpriorityscore=0 impostorscore=0 phishscore=0 priorityscore=1501 suspectscore=0 adultscore=0 spamscore=0 bulkscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2510240001 definitions=main-2511270139 On 11/27/25 6:11 PM, Jorge Ramirez wrote: > On 27/11/25 12:47:19, Konrad Dybcio wrote: >> On 11/25/25 1:55 PM, Jorge Ramirez wrote: >>> On 21/11/25 20:22:13, Konrad Dybcio wrote: >>>> On 11/21/25 7:43 PM, Jorge Ramirez-Ortiz wrote: >>>>> The Venus encoder and decoder video devices currently report the same >>>>> bus_info string ("platform:qcom-venus"). >>>>> >>>>> Assign unique bus_info identifiers by appending ":dec" and ":enc" to the >>>>> parent device name. With this change v4l2-ctl will display two separate >>>>> logical devices >>>>> >>>>> Signed-off-by: Jorge Ramirez-Ortiz >>>>> --- >>>> >>>> Perhaps that's a stupid question, but is there a reason they're >>>> separate at all? >>> >>> not sure I understand, enc/dec support different APIs, v4l2 controls..is >>> that what you mean? >> >> Perhaps that shows my lack of knowledge about V4L2. I had imagined that >> a single video device could implement (non-colliding) enc_xyz and dec_xyz >> operations and was wondering why we need two. >> > > I think the main issue is that the pipelines have very different > flows/states and semantics so even if the IP block serves both, the > v4l2 abstraction needs to have them separate (plus we want concurrency). Ah right, that makes sense Thanks! Konrad