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Mon, 02 Nov 2026 07:54:38 -0800 (PST) Received: from [192.168.0.167] ([64.43.42.35]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-48e71a4d511sm20298463f8f.8.2026.11.02.07.54.36 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 02 Nov 2026 07:54:37 -0800 (PST) Message-ID: <0785069a-eea5-440a-a12b-3c01a02b579e@linaro.org> Date: Mon, 2 Nov 2026 15:54:36 +0000 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 v2 8/9] media: qcom: camss: Switch on frame_sync_en for x1e/x2e To: Konrad Dybcio , Vladimir Zapolskiy , Loic Poulain , Mauro Carvalho Chehab Cc: linux-media@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, Bryan O'Donoghue References: <20261102-v4l2-frame-sync-v2-0-25cbed7a772f@kernel.org> <20261102-v4l2-frame-sync-v2-8-25cbed7a772f@kernel.org> From: Bryan O'Donoghue Content-Language: en-GB In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 02/11/2026 14:32, Konrad Dybcio wrote: > On 11/2/26 2:56 PM,bryan.odonoghue@linaro.org wrote: >> From: Bryan O'Donoghue >> >> Switch frame_sync_en to true to track and consume SOF/EOF data. >> >> Tested-by: Bryan O'Donoghue # x1e CRD >> Signed-off-by: Bryan O'Donoghue >> --- > Is there a reason why it's gated behind a feature flag? Will > exposing a SOF seq counter that's always zero (i.e. not > implemented, never bumped) have negative consequences on > userspace? > > Conversely, what information (i.e. platform list) are you > lacking that would let us make this non-opt-in? > > Konrad Yes. To be in-spece we should already be incrementing vb.sequence not on every RX data-frame but on every MIPI_CSI2.SOF. You can't just return zero as user-space wants to know about sequence numbers. --- bod