linux-kernel - Re: [PATCH] media: iris: Refine internal buffer reconfiguration logic for resolution change

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Message-ID: <d6004442-fba0-4896-95e1-04a0c6b1dd7b@kernel.org>
Date: Tue, 4 Nov 2025 10:17:45 +0000
From: Bryan O'Donoghue <bod@...nel.org>
To: Dikshita Agarwal <dikshita.agarwal@....qualcomm.com>,
 Vikash Garodia <vikash.garodia@....qualcomm.com>,
 Abhinav Kumar <abhinav.kumar@...ux.dev>,
 Mauro Carvalho Chehab <mchehab@...nel.org>,
 Hans Verkuil <hverkuil@...nel.org>,
 Stefan Schmidt <stefan.schmidt@...aro.org>
Cc: linux-media@...r.kernel.org, linux-arm-msm@...r.kernel.org,
 linux-kernel@...r.kernel.org, Val Packett <val@...kett.cool>
Subject: Re: [PATCH] media: iris: Refine internal buffer reconfiguration logic
 for resolution change

On 03/11/2025 11:05, Dikshita Agarwal wrote:
> Improve the condition used to determine when input internal buffers need
> to be reconfigured during streamon on the capture port. Previously, the
> check relied on the INPUT_PAUSE sub-state, which was also being set
> during seek operations. This led to input buffers being queued multiple
> times to the firmware, causing session errors due to duplicate buffer
> submissions.
> 
> This change introduces a more accurate check using the FIRST_IPSC and
> DRC sub-states to ensure that input buffer reconfiguration is triggered
> only during resolution change scenarios, such as streamoff/on on the
> capture port. This avoids duplicate buffer queuing during seek
> operations.
> 
> Fixes: c1f8b2cc72ec ("media: iris: handle streamoff/on from client in dynamic resolution change")
> Reported-by: Val Packett <val@...kett.cool>
> Closes: https://gitlab.freedesktop.org/gstreamer/gstreamer/-/issues/4700
> Signed-off-by: Dikshita Agarwal <dikshita.agarwal@....qualcomm.com>
> ---
>   drivers/media/platform/qcom/iris/iris_common.c | 7 +++++--
>   1 file changed, 5 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/media/platform/qcom/iris/iris_common.c b/drivers/media/platform/qcom/iris/iris_common.c
> index 9fc663bdaf3fc989fe1273b4d4280a87f68de85d..21e176ce49ac2d2d26cf4fc25c1e5bca0abe501f 100644
> --- a/drivers/media/platform/qcom/iris/iris_common.c
> +++ b/drivers/media/platform/qcom/iris/iris_common.c
> @@ -90,13 +90,15 @@ int iris_process_streamon_input(struct iris_inst *inst)
> 
>   int iris_process_streamon_output(struct iris_inst *inst)
>   {
> +	bool drain_active = false, drc_active = false, first_ipsc = false;
>   	const struct iris_hfi_command_ops *hfi_ops = inst->core->hfi_ops;
> -	bool drain_active = false, drc_active = false;
>   	enum iris_inst_sub_state clear_sub_state = 0;
>   	int ret = 0;
> 
>   	iris_scale_power(inst);
> 
> +	first_ipsc = inst->sub_state & IRIS_INST_SUB_FIRST_IPSC;
> +
>   	drain_active = inst->sub_state & IRIS_INST_SUB_DRAIN &&
>   		inst->sub_state & IRIS_INST_SUB_DRAIN_LAST;
> 
> @@ -108,7 +110,8 @@ int iris_process_streamon_output(struct iris_inst *inst)
>   	else if (drain_active)
>   		clear_sub_state = IRIS_INST_SUB_DRAIN | IRIS_INST_SUB_DRAIN_LAST;
> 
> -	if (inst->domain == DECODER && inst->sub_state & IRIS_INST_SUB_INPUT_PAUSE) {
> +	 /* Input internal buffer reconfiguration required incase of resolution change */
> +	if (first_ipsc || drc_active) {
>   		ret = iris_alloc_and_queue_input_int_bufs(inst);
>   		if (ret)
>   			return ret;
> 
> ---
> base-commit: 163917839c0eea3bdfe3620f27f617a55fd76302
> change-id: 20251103-iris-seek-fix-7a25af22fa52
> 
> Best regards,
> --
> Dikshita Agarwal <dikshita.agarwal@....qualcomm.com>
> 

This is breaking in CI

https://gitlab.freedesktop.org/linux-media/users/bodonoghue/-/commit/3d6c2dff61e37bd36eeb677c061ebcf64945060a

---
bod