linux-kernel - Re: [PATCH 4/8] media: iris: stop encoding PIPE value into fw

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Message-ID: <d9b6ed42-d70f-46d2-a0c6-a98df4b46607@oss.qualcomm.com>
Date: Wed, 8 Oct 2025 10:03:49 +0200
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>,
        Vikash Garodia <vikash.garodia@....qualcomm.com>,
        Dikshita Agarwal <dikshita.agarwal@....qualcomm.com>,
        Abhinav Kumar <abhinav.kumar@...ux.dev>,
        Bryan O'Donoghue <bod@...nel.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>
Cc: linux-media@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/8] media: iris: stop encoding PIPE value into fw_caps

On 10/8/25 6:33 AM, 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.
> 
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
> ---
>  drivers/media/platform/qcom/iris/iris_ctrls.c            | 6 +++++-
>  drivers/media/platform/qcom/iris/iris_platform_gen2.c    | 4 ++--
>  drivers/media/platform/qcom/iris/iris_platform_qcs8300.h | 4 ++--
>  drivers/media/platform/qcom/iris/iris_platform_sm8250.c  | 4 ++--
>  4 files changed, 11 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/media/platform/qcom/iris/iris_ctrls.c b/drivers/media/platform/qcom/iris/iris_ctrls.c
> index 0e9adb3982a49cfd7cbe5110cfd5f573f0f7bb38..8db3fa222bdb92a7ffff3dfe62d33f16c0550757 100644
> --- a/drivers/media/platform/qcom/iris/iris_ctrls.c
> +++ b/drivers/media/platform/qcom/iris/iris_ctrls.c
> @@ -318,7 +318,11 @@ void iris_session_init_caps(struct iris_core *core)
>  			continue;
>  
>  		core->inst_fw_caps_dec[cap_id].idx = i;
> -		core->inst_fw_caps_dec[cap_id].value = caps[i].value;
> +		if (cap_id == PIPE)
> +			core->inst_fw_caps_dec[cap_id].value =
> +				core->iris_platform_data->num_vpp_pipe;
> +		else
> +			core->inst_fw_caps_dec[cap_id].value = caps[i].value;

I really hope this if-else won't grow in the future

Reviewed-by: Konrad Dybcio <konrad.dybcio@....qualcomm.com>

Konrad