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Tue, 20 Oct 2026 14:25:47 +0200 Message-ID: Date: Tue, 20 Oct 2026 14:25:46 +0200 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 2/4] media: i2c: Add ST VD55G0 global shutter sensor driver To: Sergey Lebedev , George Neacsu CC: Sakari Ailus , Sylvain Petinot , Mauro Carvalho Chehab , Dan Scally , Hans de Goede , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Peter Marshall , "Hao Yao" , , , References: <20261019162722.25587-1-lsa.uz@pm.me> <20261019162722.25587-3-lsa.uz@pm.me> <179243379000.31842.4735750009847702427@gmail.com> <20261019193402.52923-1-lsa.uz@pm.me> <179247822513.25202.7960395606350309657@gmail.com> <20261020085200.60619-1-lsa.uz@pm.me> Content-Language: en-GB From: Benjamin Mugnier In-Reply-To: <20261020085200.60619-1-lsa.uz@pm.me> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8bit X-ClientProxiedBy: STKCAS1NODE1.st.com (10.75.128.134) To STKDAG1NODE2.st.com (10.75.128.133) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: MI3PEPF0000847D:EE_|GV2PR10MB9746:EE_ X-MS-Office365-Filtering-Correlation-Id: 742f497c-f907-4e80-fcb1-08df2ea545f4 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|82310400026|7416014|23010399003|376014|1800799024|36860700016|6133799003|18002099003|22082099003|10067099003|3023799007|4143699003|261009223027099003|11063799006|56012099006; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: Bja+lKidMVVHIRN6oIhJzQqWbA+D8PL8em0kCXVS5L6C8rmWyNqUlVXFyhFxTvmh4mskMFpNp2K33LK3E2ZB2eU31it7B5YPkA2DQmrxNOPLzX5ZTVC0AsWY8vmTU59Lm3dzvOu1uHKVXNn4SDY7VtuRaoI+glTOmyBDX4x0nIqYSKTCgAEq8N03qokE9Ydkxzyb2z9lW5YlGEFVcLfcJBmBDCbeAE3AQBAU8UEVExwcSN6ov+/8dDhsBrfki9TXVFVh9PDv1xg4dkLTURDDpI9efOkW7BobvWZDaUtcXFZqXH+vIDArA4eTT6ZoQ7EBXeMIuKMqHvx4jcEH8RzYxl7n2+0ua/I1yRqDke9RP/CUkCxqfTRDZocK5yto/m9hgQGbTEBa6bCZpwzEu3lS9e8gzNxxA9E17jT/881eXh0YV2N3FRrvcI45NpvF4Vxw X-OriginatorOrg: foss.st.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 20 Oct 2026 12:25:48.7632 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 742f497c-f907-4e80-fcb1-08df2ea545f4 X-MS-Exchange-CrossTenant-Id: 75e027c9-20d5-47d5-b82f-77d7cd041e8f X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=75e027c9-20d5-47d5-b82f-77d7cd041e8f;Ip=[164.130.1.59];Helo=[smtpO365.st.com] X-MS-Exchange-CrossTenant-AuthSource: MI3PEPF0000847D.eurprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: GV2PR10MB9746 Hi, Le 20/10/2026 à 10:52, Sergey Lebedev a écrit : > Hi George, > > On 20/10/2026 07:44, George Neacsu wrote: >> Would you be comfortable dropping that write in the next revision? I can >> retest the revision on the Snapdragon model and add a Tested-by once it >> is clean. > > Yes, I will drop that write in v2 and leave 0x0329 at its default, and > Cc you on it. Thank you for narrowing it down to one line. > > On the Intel model it makes no difference. In one boot, with the sensor > held powered and 0x0329 set to 1, then 0, then 1 again, each state > streamed 150 of 150 frames at 59.14 fps and restarted 10 of 10 times. > The test-pattern frames showed no shift or extra lines in any state, so > IPU7 does not put the status lines into the buffer, and its error > count did not change. The full test run without the write > matches the run with it, v4l2-compliance 46 of 46 included. > > One thing I cannot explain: on 16/10 your vd55g1 build streamed 2/2 > with 0x0329 = 0 written once per power-on, as v1 does it. So the write > alone may not be what stops CAMSS; something else in v1 may take part. > Leaving the register alone is simpler either way. I'm a bit puzzled on this. ISL are output on a different data type than regular data. They are output with 0x12, which translates to MIPI_CSI2_DT_EMBEDDED_8B in V4L2. Your receiver should drop these frames regardless as it only waits for data and not ISL. Outputting them doesn't affect sensor timings either. I guess there could be an issue on the receiver side ? Maybe your receiver is ignoring data types and completes the frame with ISL data, effectively filling up the DMA ? > > Sergey -- Regards, Benjamin