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Tue, 25 Nov 2025 21:31:30 -0800 (PST) X-Google-Smtp-Source: AGHT+IGU5az0gzS/5N/piHae1Dirr78cTP7cS2wFoPm6L+3htwFnXwqyqtvUhe1OT3gow3iDtPhM+A== X-Received: by 2002:a17:903:2ac5:b0:295:9871:81dd with SMTP id d9443c01a7336-29b6bedb625mr184589775ad.25.1764135089942; Tue, 25 Nov 2025 21:31:29 -0800 (PST) Received: from [10.0.0.3] ([106.222.230.111]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-29b5b107effsm187485025ad.14.2025.11.25.21.31.26 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 25 Nov 2025 21:31:29 -0800 (PST) Message-ID: <791d7bb3-a96a-ed5c-a59c-90cbbd712ffa@oss.qualcomm.com> Date: Wed, 26 Nov 2025 11:01:25 +0530 Precedence: bulk X-Mailing-List: linux-arm-msm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:102.0) Gecko/20100101 Thunderbird/102.13.0 Subject: Re: [PATCH] media: venus: assign unique bus_info strings for encoder and decoder Content-Language: en-US To: Jorge Ramirez Cc: vikash.garodia@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> <35d86818-8b50-1c0e-40a0-5f80c4b24a32@oss.qualcomm.com> From: Dikshita Agarwal In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Authority-Analysis: v=2.4 cv=PJgCOPqC c=1 sm=1 tr=0 ts=692690b3 cx=c_pps a=cmESyDAEBpBGqyK7t0alAg==:117 a=12FOtvgV4D2gsqRYbU+y8g==:17 a=IkcTkHD0fZMA:10 a=6UeiqGixMTsA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=VwQbUJbxAAAA:8 a=xOd6jRPJAAAA:8 a=EUspDBNiAAAA:8 a=jy-4xleNOOuNcfXGUj4A:9 a=QEXdDO2ut3YA:10 a=1OuFwYUASf3TG4hYMiVC:22 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUxMTI2MDA0MyBTYWx0ZWRfX01vUMXLAV16e I3omuOLjhRRdDW5xQP5C7E65+3NWK/dQbgZwILLyeotaqX2/MZiotxDo8WcneDTHdXtyw7qQa3s 0nDfcUAxCimJDK8ghTNex1SId1PZaP9Bh/gGy3TzAib81lQAKD3FRm4WcAqqEvUHC2Rxch3r+0H ELTBXQUI/mH3EuSYW3P3kDX4fHPq75bWUjQ73U1wx+bOvUPjJHEbG0cFb4Olh/tB4cj6sTT3ZSW ZttTwUPgtWPIvE8ezSzkRDQETmO/How7D0jxqtsCNNoaUOGMFr/exbV9aPooedUX/n7142aGPDk Sju7d8qrRax1HWADdiKrbpHHbUITG0ZyQLUVQg7+r1MQYzCQF9y3IQa/0FB299V31hwjY/rdTeY +7aG5Ecpnpk/PpS1o9cJpYb48bwdMg== X-Proofpoint-GUID: G3nwcAIUaSd-g65UCJdn-InKTJQqlpbV X-Proofpoint-ORIG-GUID: G3nwcAIUaSd-g65UCJdn-InKTJQqlpbV 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_02,2025-11-25_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 impostorscore=0 lowpriorityscore=0 suspectscore=0 adultscore=0 spamscore=0 malwarescore=0 clxscore=1015 phishscore=0 bulkscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2510240001 definitions=main-2511260043 On 11/26/2025 2:49 AM, Jorge Ramirez wrote: > On 25/11/25 18:39:14, Dikshita Agarwal wrote: >> >> >> On 11/25/2025 6:22 PM, Jorge Ramirez wrote: >>> On 25/11/25 13:59:56, Dikshita Agarwal wrote: >>>> >>>> >>>> On 11/22/2025 12:13 AM, 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 >>>>> --- >>>>> drivers/media/platform/qcom/venus/vdec.c | 5 +++++ >>>>> drivers/media/platform/qcom/venus/venc.c | 5 +++++ >>>>> 2 files changed, 10 insertions(+) >>>>> >>>>> diff --git a/drivers/media/platform/qcom/venus/vdec.c b/drivers/media/platform/qcom/venus/vdec.c >>>>> index 4a6641fdffcf..63f6ae1ff6ac 100644 >>>>> --- a/drivers/media/platform/qcom/venus/vdec.c >>>>> +++ b/drivers/media/platform/qcom/venus/vdec.c >>>>> @@ -433,9 +433,14 @@ vdec_g_selection(struct file *file, void *fh, struct v4l2_selection *s) >>>>> static int >>>>> vdec_querycap(struct file *file, void *fh, struct v4l2_capability *cap) >>>>> { >>>>> + struct venus_inst *inst = to_inst(file); >>>>> + struct venus_core *core = inst->core; >>>>> + >>>>> strscpy(cap->driver, "qcom-venus", sizeof(cap->driver)); >>>>> strscpy(cap->card, "Qualcomm Venus video decoder", sizeof(cap->card)); >>>>> strscpy(cap->bus_info, "platform:qcom-venus", sizeof(cap->bus_info)); >>>>> + snprintf(cap->bus_info, sizeof(cap->bus_info), >>>>> + "platform:%s:dec", dev_name(core->dev)); >>>> >>>> Is there a reason to keep both strscpy() and snprintf() for cap->bus_info? >>>> The second call to snprintf() seems to overwrite the value set by >>>> strscpy(), making the first assignment redundant. Would it be cleaner to >>>> remove the strscpy() line and rely solely on snprintf()? >>> >>> argh, my bad, you are right. will fix. >>> >>> perhaps we should just have instead >>> >>> decoder: >>> strscpy(cap->bus_info,"platform:qcom-venus-dec", sizeof(cap->bus_info)); >>> >>> encoder: >>> strscpy(cap->bus_info, "platform:qcom-venus-enc",sizeof(cap->bus_info)); on the encoder >>> >>> I suppose the additional info provided by the dev_name is not really >>> important to consumers. >> >> In-fact, we don't even need to fill the bus_info, received a similar >> comment on iris [1] >> [1]: >> https://lore.kernel.org/linux-media/c4350128-a05c-47af-a7e7-2810171cd311@xs4all.nl/ > > > Nope, that is wrong. > > if we dont fill bus_info we will end up with the following again: > > root@qrb2210-rb1-core-kit:~# v4l2-ctl --list-devices > Qualcomm Venus video encoder (platform:5a00000.video-codec): > /dev/video0 > /dev/video1 > > instead of something like this: > > root@qrb2210-rb1-core-kit:~# v4l2-ctl --list-devices > Qualcomm Venus video decoder (platform:qcom-venus_dec): > /dev/video1 > > Qualcomm Venus video encoder (platform:qcom-venus_enc): > /dev/video0 Got it. Thanks, Dikshita