linux-kernel - Re: [PATCH v2 3/6] media: qcom: iris: Add B frames support for encoder

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Message-ID: <0758caf0-c23d-8fd8-ab26-2c68e5f78f60@oss.qualcomm.com>
Date: Tue, 30 Dec 2025 11:26:40 +0530
From: Dikshita Agarwal <dikshita.agarwal@....qualcomm.com>
To: Wangao Wang <wangao.wang@....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>
Cc: quic_qiweil@...cinc.com, Renjiang Han <renjiang.han@....qualcomm.com>,
        linux-media@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/6] media: qcom: iris: Add B frames support for
 encoder



On 12/19/2025 1:12 PM, Wangao Wang wrote:
> Add support for B-frame configuration on both gen1 and gen2 encoders by
> enabling V4L2_CID_MPEG_VIDEO_B_FRAMES control.
> 
> Signed-off-by: Wangao Wang <wangao.wang@....qualcomm.com>
> ---
>  drivers/media/platform/qcom/iris/iris_ctrls.c      | 30 ++++++++++++++++++++++
>  drivers/media/platform/qcom/iris/iris_ctrls.h      |  1 +
>  .../platform/qcom/iris/iris_hfi_gen1_command.c     |  8 ++++++
>  .../platform/qcom/iris/iris_hfi_gen1_defines.h     | 10 ++++++++
>  .../platform/qcom/iris/iris_platform_common.h      |  2 ++
>  .../media/platform/qcom/iris/iris_platform_gen1.c  | 18 +++++++++++++
>  .../media/platform/qcom/iris/iris_platform_gen2.c  | 10 ++++++++
>  drivers/media/platform/qcom/iris/iris_vpu_buffer.c |  6 ++++-
>  8 files changed, 84 insertions(+), 1 deletion(-)
> 

<snip>

> diff --git a/drivers/media/platform/qcom/iris/iris_platform_common.h b/drivers/media/platform/qcom/iris/iris_platform_common.h
> index c48dfb6d47734fadd4f2e4123c93560f55355b86..34deb32eb5be0899fee779ff99b3f4b8bd91529f 100644
> --- a/drivers/media/platform/qcom/iris/iris_platform_common.h
> +++ b/drivers/media/platform/qcom/iris/iris_platform_common.h
> @@ -154,6 +154,8 @@ enum platform_inst_fw_cap_type {
>  	LTR_COUNT,
>  	USE_LTR,
>  	MARK_LTR,
> +	B_FRAME,
> +	INTRA_PERIOD,
>  	INST_FW_CAP_MAX,
>  };
>  
> diff --git a/drivers/media/platform/qcom/iris/iris_platform_gen1.c b/drivers/media/platform/qcom/iris/iris_platform_gen1.c
> index 13cee5f72a443b85136d30b41b589aeb0db8eb9a..78f3a44f4ef037a5291330627b3e94750b624f4d 100644
> --- a/drivers/media/platform/qcom/iris/iris_platform_gen1.c
> +++ b/drivers/media/platform/qcom/iris/iris_platform_gen1.c
> @@ -279,6 +279,24 @@ static const struct platform_inst_fw_cap inst_fw_cap_sm8250_enc[] = {
>  		.flags = CAP_FLAG_INPUT_PORT | CAP_FLAG_DYNAMIC_ALLOWED,
>  		.set = iris_set_mark_ltr,
>  	},
> +	{
> +		.cap_id = B_FRAME,
> +		.min = 0,
> +		.max = 3,
> +		.step_or_mask = 1,
> +		.value = 0,
> +		.flags = CAP_FLAG_OUTPUT_PORT,
> +	},
> +	{
> +		.cap_id = INTRA_PERIOD,
> +		.min = 0,
> +		.max = 1,
> +		.step_or_mask = 1,
> +		.value = 0,
> +		.hfi_id = HFI_PROPERTY_CONFIG_VENC_INTRA_PERIOD,
> +		.flags = CAP_FLAG_OUTPUT_PORT,
> +		.set = iris_set_intra_period,
> +	},
>  };

is this not needed for gen2?

>  
>  static struct platform_inst_caps platform_inst_cap_sm8250 = {
> diff --git a/drivers/media/platform/qcom/iris/iris_platform_gen2.c b/drivers/media/platform/qcom/iris/iris_platform_gen2.c
> index 99d8e1e59e6bfd5e4ab0fd2b5831f74c54b6e87d..56b6a73bff8ae8e1da06a7b53632712932abe5bb 100644
> --- a/drivers/media/platform/qcom/iris/iris_platform_gen2.c
> +++ b/drivers/media/platform/qcom/iris/iris_platform_gen2.c
> @@ -667,6 +667,16 @@ static const struct platform_inst_fw_cap inst_fw_cap_sm8550_enc[] = {
>  		.flags = CAP_FLAG_INPUT_PORT | CAP_FLAG_DYNAMIC_ALLOWED,
>  		.set = iris_set_use_and_mark_ltr,
>  	},
> +	{
> +		.cap_id = B_FRAME,
> +		.min = 0,
> +		.max = 1,
> +		.step_or_mask = 1,
> +		.value = 0,
> +		.hfi_id = HFI_PROP_MAX_B_FRAMES,
> +		.flags = CAP_FLAG_OUTPUT_PORT,
> +		.set = iris_set_u32,
> +	},
>  };
>