linux-kernel - Re: [PATCH v4 3/6] media: iris: stop encoding PIPE value into fw

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Message-ID: <8c75296f-2cd7-b0cb-f7ae-d433d2834bdd@oss.qualcomm.com>
Date: Thu, 23 Oct 2025 14:20:36 +0530
From: Dikshita Agarwal <dikshita.agarwal@....qualcomm.com>
To: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>,
        Vikash Garodia <vikash.garodia@....qualcomm.com>,
        Abhinav Kumar <abhinav.kumar@...ux.dev>,
        Bryan O'Donoghue <bod@...nel.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Konrad Dybcio <konrad.dybcio@....qualcomm.com>
Cc: linux-media@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 3/6] media: iris: stop encoding PIPE value into fw_caps



On 10/19/2025 1:26 PM, Dmitry Baryshkov wrote:
> The value of the PIPE property depends on the number of pipes available
> on the platform and is frequently the only difference between several
> fw_caps. In order to reduce duplciation, use num_vpp_pipe from the
> iris_platform_data rather than hardcoding the value into the fw_cap.
> 
> Reviewed-by: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
> ---
>  drivers/media/platform/qcom/iris/iris_ctrls.c            | 16 +++++++++++++---
>  drivers/media/platform/qcom/iris/iris_platform_gen2.c    |  3 +--
>  drivers/media/platform/qcom/iris/iris_platform_qcs8300.h |  3 +--
>  drivers/media/platform/qcom/iris/iris_platform_sm8250.c  |  3 +--
>  4 files changed, 16 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/media/platform/qcom/iris/iris_ctrls.c b/drivers/media/platform/qcom/iris/iris_ctrls.c
> index 9da050aa1f7ce8152dfa46a706e2c27adfb5d6ce..c0b3a09ad3e3dfb0a47e3603a8089cf61390fda8 100644
> --- a/drivers/media/platform/qcom/iris/iris_ctrls.c
> +++ b/drivers/media/platform/qcom/iris/iris_ctrls.c
> @@ -313,13 +313,23 @@ void iris_session_init_caps(struct iris_core *core)
>  			continue;
>  
>  		core->inst_fw_caps_dec[cap_id].cap_id = caps[i].cap_id;
> -		core->inst_fw_caps_dec[cap_id].min = caps[i].min;
> -		core->inst_fw_caps_dec[cap_id].max = caps[i].max;
>  		core->inst_fw_caps_dec[cap_id].step_or_mask = caps[i].step_or_mask;
> -		core->inst_fw_caps_dec[cap_id].value = caps[i].value;
>  		core->inst_fw_caps_dec[cap_id].flags = caps[i].flags;
>  		core->inst_fw_caps_dec[cap_id].hfi_id = caps[i].hfi_id;
>  		core->inst_fw_caps_dec[cap_id].set = caps[i].set;
> +
> +		if (cap_id == PIPE) {
> +			core->inst_fw_caps_dec[cap_id].value =
> +				core->iris_platform_data->num_vpp_pipe;
> +			core->inst_fw_caps_dec[cap_id].min =
> +				core->iris_platform_data->num_vpp_pipe;
> +			core->inst_fw_caps_dec[cap_id].max =
> +				core->iris_platform_data->num_vpp_pipe;
> +		} else {
> +			core->inst_fw_caps_dec[cap_id].min = caps[i].min;
> +			core->inst_fw_caps_dec[cap_id].max = caps[i].max;
> +			core->inst_fw_caps_dec[cap_id].value = caps[i].value;
> +		}
>  	}
>  
>  	caps = core->iris_platform_data->inst_fw_caps_enc;
> diff --git a/drivers/media/platform/qcom/iris/iris_platform_gen2.c b/drivers/media/platform/qcom/iris/iris_platform_gen2.c
> index b444e816355624bca8248cce9da7adcd7caf6c5b..03ce5c259c8491ae6882128795d18569baea6241 100644
> --- a/drivers/media/platform/qcom/iris/iris_platform_gen2.c
> +++ b/drivers/media/platform/qcom/iris/iris_platform_gen2.c
> @@ -161,9 +161,8 @@ static const struct platform_inst_fw_cap inst_fw_cap_sm8550_dec[] = {
>  	{
>  		.cap_id = PIPE,
>  		.min = PIPE_1,

Do we still need min here?

Thanks,
Dikshita
> -		.max = PIPE_4,
> +		/* .max, .min and .value are set via platform data */
>  		.step_or_mask = 1,
> -		.value = PIPE_4,
>  		.hfi_id = HFI_PROP_PIPE,
>  		.set = iris_set_pipe,
>  	},
> diff --git a/drivers/media/platform/qcom/iris/iris_platform_qcs8300.h b/drivers/media/platform/qcom/iris/iris_platform_qcs8300.h
> index 87517361a1cf4b6fe53b8a1483188670df52c7e7..310c48958018ae724d01c87e7977096cd86e1bfd 100644
> --- a/drivers/media/platform/qcom/iris/iris_platform_qcs8300.h
> +++ b/drivers/media/platform/qcom/iris/iris_platform_qcs8300.h
> @@ -147,9 +147,8 @@ static const struct platform_inst_fw_cap inst_fw_cap_qcs8300_dec[] = {
>  	{
>  		.cap_id = PIPE,
>  		.min = PIPE_1,
> -		.max = PIPE_2,
> +		/* .max, .min and .value are set via platform data */
>  		.step_or_mask = 1,
> -		.value = PIPE_2,
>  		.hfi_id = HFI_PROP_PIPE,
>  		.set = iris_set_pipe,
>  	},
> diff --git a/drivers/media/platform/qcom/iris/iris_platform_sm8250.c b/drivers/media/platform/qcom/iris/iris_platform_sm8250.c
> index 66a5bdd24d8a0e98b0554a019438bf4caa1dc43c..9cb9ddc86ad73daf75383b3253e851394235093d 100644
> --- a/drivers/media/platform/qcom/iris/iris_platform_sm8250.c
> +++ b/drivers/media/platform/qcom/iris/iris_platform_sm8250.c
> @@ -21,9 +21,8 @@ static const struct platform_inst_fw_cap inst_fw_cap_sm8250_dec[] = {
>  	{
>  		.cap_id = PIPE,
>  		.min = PIPE_1,
> -		.max = PIPE_4,
> +		/* .max, .min and .value are set via platform data */
>  		.step_or_mask = 1,
> -		.value = PIPE_4,
>  		.hfi_id = HFI_PROPERTY_PARAM_WORK_ROUTE,
>  		.set = iris_set_pipe,
>  	},
>