linux-kernel - Re: [PATCH 2/4] media: qcom: iris: Add Long-Term Reference support for encoder

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Message-ID: <17b48dc5-9808-db54-323e-40cb5bbf9b12@oss.qualcomm.com>
Date: Wed, 3 Dec 2025 12:26:34 +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 2/4] media: qcom: iris: Add Long-Term Reference support
 for encoder



On 11/27/2025 1:14 PM, Wangao Wang wrote:
> Add Long-Term Reference(LTR) frame support for both gen1 and gen2
> encoders by enabling the following V4L2 controls:
> V4L2_CID_MPEG_VIDEO_LTR_COUNT
> V4L2_CID_MPEG_VIDEO_USE_LTR_FRAMES
> V4L2_CID_MPEG_VIDEO_FRAME_LTR_INDEX
> 
> Key changes:
> Added LTR capability IDs and V4L2 controls.
> Implemented handlers for LTR count, use, and mark (gen1/gen2).
> Defined new HFI properties and structures for LTR.
> Updated platform capability tables and buffer size calculations.
> 
> Signed-off-by: Wangao Wang <wangao.wang@....qualcomm.com>
> ---
>  drivers/media/platform/qcom/iris/iris_ctrls.c      | 126 +++++++++++++++++++++
>  drivers/media/platform/qcom/iris/iris_ctrls.h      |   5 +
>  .../platform/qcom/iris/iris_hfi_gen1_command.c     |  25 ++++
>  .../platform/qcom/iris/iris_hfi_gen1_defines.h     |  24 ++++
>  .../platform/qcom/iris/iris_hfi_gen2_defines.h     |   3 +
>  .../platform/qcom/iris/iris_platform_common.h      |   6 +
>  .../media/platform/qcom/iris/iris_platform_gen1.c  |  30 +++++
>  .../media/platform/qcom/iris/iris_platform_gen2.c  |  30 +++++
>  drivers/media/platform/qcom/iris/iris_vpu_buffer.c |  33 ++++--
>  9 files changed, 270 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/media/platform/qcom/iris/iris_ctrls.c b/drivers/media/platform/qcom/iris/iris_ctrls.c
> index cdf38c285b9133f20bdb9bc3dd0f5e916d3ed7f8..33e104142a5bb51c952550fa45e81b3bdc723ac2 100644
> --- a/drivers/media/platform/qcom/iris/iris_ctrls.c
> +++ b/drivers/media/platform/qcom/iris/iris_ctrls.c
> @@ -108,6 +108,12 @@ static enum platform_inst_fw_cap_type iris_get_cap_id(u32 id)
>  		return IR_TYPE;
>  	case V4L2_CID_MPEG_VIDEO_INTRA_REFRESH_PERIOD:
>  		return IR_PERIOD;
> +	case V4L2_CID_MPEG_VIDEO_LTR_COUNT:
> +		return LTR_COUNT;
> +	case V4L2_CID_MPEG_VIDEO_USE_LTR_FRAMES:
> +		return USE_LTR;
> +	case V4L2_CID_MPEG_VIDEO_FRAME_LTR_INDEX:
> +		return MARK_LTR;
>  	default:
>  		return INST_FW_CAP_MAX;
>  	}
> @@ -205,6 +211,12 @@ static u32 iris_get_v4l2_id(enum platform_inst_fw_cap_type cap_id)
>  		return V4L2_CID_MPEG_VIDEO_INTRA_REFRESH_PERIOD_TYPE;
>  	case IR_PERIOD:
>  		return V4L2_CID_MPEG_VIDEO_INTRA_REFRESH_PERIOD;
> +	case LTR_COUNT:
> +		return V4L2_CID_MPEG_VIDEO_LTR_COUNT;
> +	case USE_LTR:
> +		return V4L2_CID_MPEG_VIDEO_USE_LTR_FRAMES;
> +	case MARK_LTR:
> +		return V4L2_CID_MPEG_VIDEO_FRAME_LTR_INDEX;
>  	default:
>  		return 0;
>  	}
> @@ -1022,6 +1034,120 @@ int iris_set_ir_period_gen2(struct iris_inst *inst, enum platform_inst_fw_cap_ty
>  					     &ir_period, sizeof(u32));
>  }
>  
> +int iris_set_ltr_count_gen1(struct iris_inst *inst, enum platform_inst_fw_cap_type cap_id)
> +{
> +	const struct iris_hfi_command_ops *hfi_ops = inst->core->hfi_ops;
> +	u32 ltr_count = inst->fw_caps[cap_id].value;
> +	u32 hfi_id = inst->fw_caps[cap_id].hfi_id;
> +	struct hfi_ltr_mode ltr_mode;
> +
> +	if (!ltr_count)
> +		return -EINVAL;
> +
> +	ltr_mode.count = ltr_count;
> +	ltr_mode.mode = HFI_LTR_MODE_MANUAL;
> +	ltr_mode.trust_mode = 1;
> +
> +	return hfi_ops->session_set_property(inst, hfi_id,
> +					     HFI_HOST_FLAGS_NONE,
> +					     iris_get_port_info(inst, cap_id),
> +					     HFI_PAYLOAD_STRUCTURE,
> +					     &ltr_mode, sizeof(ltr_mode));
> +}
> +
> +int iris_set_use_ltr(struct iris_inst *inst, enum platform_inst_fw_cap_type cap_id)
> +{
> +	const struct iris_hfi_command_ops *hfi_ops = inst->core->hfi_ops;
> +	struct vb2_queue *sq = v4l2_m2m_get_src_vq(inst->m2m_ctx);
> +	struct vb2_queue *dq = v4l2_m2m_get_dst_vq(inst->m2m_ctx);
> +	u32 ltr_count = inst->fw_caps[LTR_COUNT].value;
> +	u32 hfi_id = inst->fw_caps[cap_id].hfi_id;
> +	struct hfi_ltr_use ltr_use;
> +
> +	if (!vb2_is_streaming(sq) && !vb2_is_streaming(dq))
> +		return -EINVAL;

RC check not required here?

> +
> +	if (!ltr_count)
> +		return -EINVAL;
> +
> +	ltr_use.ref_ltr = inst->fw_caps[cap_id].value;
> +	ltr_use.use_constrnt = true;
> +	ltr_use.frames = 0;
> +
> +	return hfi_ops->session_set_property(inst, hfi_id,
> +					     HFI_HOST_FLAGS_NONE,
> +					     iris_get_port_info(inst, cap_id),
> +					     HFI_PAYLOAD_STRUCTURE,
> +					     &ltr_use, sizeof(ltr_use));
> +}
> +
> +int iris_set_mark_ltr(struct iris_inst *inst, enum platform_inst_fw_cap_type cap_id)
> +{
> +	const struct iris_hfi_command_ops *hfi_ops = inst->core->hfi_ops;
> +	struct vb2_queue *sq = v4l2_m2m_get_src_vq(inst->m2m_ctx);
> +	struct vb2_queue *dq = v4l2_m2m_get_dst_vq(inst->m2m_ctx);
> +	u32 ltr_count = inst->fw_caps[LTR_COUNT].value;
> +	u32 hfi_id = inst->fw_caps[cap_id].hfi_id;
> +	struct hfi_ltr_mark ltr_mark;
> +
> +	if (!vb2_is_streaming(sq) && !vb2_is_streaming(dq))
> +		return -EINVAL;
> +
> +	if (!ltr_count)
> +		return -EINVAL;
> +

RC check not required here?

> +	ltr_mark.mark_frame = inst->fw_caps[cap_id].value;
> +
> +	return hfi_ops->session_set_property(inst, hfi_id,
> +					     HFI_HOST_FLAGS_NONE,
> +					     iris_get_port_info(inst, cap_id),
> +					     HFI_PAYLOAD_STRUCTURE,
> +					     &ltr_mark, sizeof(ltr_mark));
> +}
> +
> +int iris_set_ltr_count_gen2(struct iris_inst *inst, enum platform_inst_fw_cap_type cap_id)
> +{
> +	const struct iris_hfi_command_ops *hfi_ops = inst->core->hfi_ops;
> +	u32 ltr_count = inst->fw_caps[cap_id].value;
> +	u32 hfi_id = inst->fw_caps[cap_id].hfi_id;
> +
> +	if (!ltr_count)
> +		return -EINVAL;
> +
> +	if (inst->hfi_rc_type == HFI_RATE_CONTROL_VBR_VFR ||
> +	    inst->hfi_rc_type == HFI_RATE_CONTROL_VBR_CFR ||
> +	    inst->hfi_rc_type == HFI_RATE_CONTROL_CQ)
> +		return -EINVAL;
> +
> +	return hfi_ops->session_set_property(inst, hfi_id,
> +					     HFI_HOST_FLAGS_NONE,
> +					     iris_get_port_info(inst, cap_id),
> +					     HFI_PAYLOAD_U32,
> +					     &ltr_count, sizeof(u32));
> +}
> +
> +int iris_set_use_and_mark_ltr(struct iris_inst *inst, enum platform_inst_fw_cap_type cap_id)
> +{
> +	const struct iris_hfi_command_ops *hfi_ops = inst->core->hfi_ops;
> +	u32 ltr_count = inst->fw_caps[LTR_COUNT].value;
> +	u32 hfi_val = inst->fw_caps[cap_id].value;
> +	u32 hfi_id = inst->fw_caps[cap_id].hfi_id;
> +
> +	if (!ltr_count || hfi_val == INVALID_DEFAULT_MARK_OR_USE_LTR)
> +		return -EINVAL;
> +
> +	if (inst->hfi_rc_type == HFI_RATE_CONTROL_VBR_VFR ||
> +	    inst->hfi_rc_type == HFI_RATE_CONTROL_VBR_CFR ||
> +	    inst->hfi_rc_type == HFI_RATE_CONTROL_CQ)
> +		return -EINVAL;
> +

Streaming check is not required here?

Thanks,
Dikshita

> +	return hfi_ops->session_set_property(inst, hfi_id,
> +					     HFI_HOST_FLAGS_NONE,
> +					     iris_get_port_info(inst, cap_id),
> +					     HFI_PAYLOAD_U32,
> +					     &hfi_val, sizeof(u32));
> +}
> +