linux-kernel - [PATCH v4 13/25] media: iris: Send V4L2_BUF_FLAG_ERROR for capture buffers with 0 filled length

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Message-ID: <20250507-video-iris-hevc-vp9-v4-13-58db3660ac61@quicinc.com>
Date: Wed, 7 May 2025 13:09:44 +0530
From: Dikshita Agarwal <quic_dikshita@...cinc.com>
To: Vikash Garodia <quic_vgarodia@...cinc.com>,
        Abhinav Kumar
	<quic_abhinavk@...cinc.com>,
        Bryan O'Donoghue <bryan.odonoghue@...aro.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Hans Verkuil
	<hverkuil@...all.nl>,
        Stefan Schmidt <stefan.schmidt@...aro.org>
CC: <linux-media@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        Dmitry Baryshkov
	<dmitry.baryshkov@....qualcomm.com>,
        Neil Armstrong
	<neil.armstrong@...aro.org>,
        Nicolas Dufresne
	<nicolas.dufresne@...labora.com>,
        Dan Carpenter <dan.carpenter@...aro.org>,
        Dikshita Agarwal <quic_dikshita@...cinc.com>, <stable@...r.kernel.org>
Subject: [PATCH v4 13/25] media: iris: Send V4L2_BUF_FLAG_ERROR for capture
 buffers with 0 filled length

Firmware sends capture buffers with 0 filled length which are not to be
displayed and should be dropped by client.
To achieve the same, add V4L2_BUF_FLAG_ERROR to such buffers by making
sure:
- These 0 length buffers are not returned as result of flush.
- Its not a buffer with LAST flag enabled which will also have 0 filled
  length.

Cc: stable@...r.kernel.org
Fixes: d09100763bed ("media: iris: add support for drain sequence")
Acked-by: Vikash Garodia <quic_vgarodia@...cinc.com>
Signed-off-by: Dikshita Agarwal <quic_dikshita@...cinc.com>
---
 drivers/media/platform/qcom/iris/iris_hfi_gen2_response.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/media/platform/qcom/iris/iris_hfi_gen2_response.c b/drivers/media/platform/qcom/iris/iris_hfi_gen2_response.c
index 4488540d1d410b58af02ab82a3238ccbe40f7093..d2cede2fe1b5a82cbd4dd399860c43ef044d687f 100644
--- a/drivers/media/platform/qcom/iris/iris_hfi_gen2_response.c
+++ b/drivers/media/platform/qcom/iris/iris_hfi_gen2_response.c
@@ -378,6 +378,11 @@ static int iris_hfi_gen2_handle_output_buffer(struct iris_inst *inst,
 
 	buf->flags = iris_hfi_gen2_get_driver_buffer_flags(inst, hfi_buffer->flags);
 
+	if (!buf->data_size && inst->state == IRIS_INST_STREAMING &&
+	    !(hfi_buffer->flags & HFI_BUF_FW_FLAG_LAST)) {
+		buf->flags |= V4L2_BUF_FLAG_ERROR;
+	}
+
 	return 0;
 }
 

-- 
2.34.1