linux-kernel - Re: [PATCH v3] media: iris: Refine internal buffer reconfiguration logic for resolution change

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Message-ID: <l2djrmw5i7dfvlrqyn3a5yrohbtpxr72xwwrgojvsfwo7w4feb@254rjgan2fyz>
Date: Mon, 10 Nov 2025 15:35:57 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Dikshita Agarwal <dikshita.agarwal@....qualcomm.com>
Cc: Vikash Garodia <vikash.garodia@....qualcomm.com>,
        Abhinav Kumar <abhinav.kumar@...ux.dev>,
        Bryan O'Donoghue <bod@...nel.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Hans Verkuil <hverkuil@...nel.org>,
        Stefan Schmidt <stefan.schmidt@...aro.org>,
        linux-media@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Val Packett <val@...kett.cool>
Subject: Re: [PATCH v3] media: iris: Refine internal buffer reconfiguration
 logic for resolution change

On Wed, Nov 05, 2025 at 11:17:37AM +0530, 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")
> Cc: stable@...r.kernel.org
> 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>
> ---
> Changes in v3:
> - Fixed the compilation issue
> - Added stable@...r.kernel.org in Cc
> - Link to v2: https://lore.kernel.org/r/20251104-iris-seek-fix-v2-1-c9dace39b43d@oss.qualcomm.com
> 
> Changes in v2:
> - Removed spurious space and addressed other comments (Nicolas)
> - Remove the unnecessary initializations (Self) 
> - Link to v1: https://lore.kernel.org/r/20251103-iris-seek-fix-v1-1-6db5f5e17722@oss.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..7f1c7fe144f707accc2e3da65ce37cd6d9dfeaff 100644
> --- a/drivers/media/platform/qcom/iris/iris_common.c
> +++ b/drivers/media/platform/qcom/iris/iris_common.c
> @@ -91,12 +91,14 @@ int iris_process_streamon_input(struct iris_inst *inst)
>  int iris_process_streamon_output(struct iris_inst *inst)
>  {
>  	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;
> +	bool drain_active, drc_active, first_ipsc;
>  	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 in case of resolution change */
> +	if (first_ipsc || drc_active) {

Another question: can this now result in PIPE being sent for the ENCODER
instance?

>  		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>
> 

-- 
With best wishes
Dmitry