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This resulted in an oversized COMV buffer allocation throughout decode session, wasting memory regardless of actual number of buffers required. For VPU3x and VPU4x platforms, introduce iris_vpu3x_4x_dec_comv_size() to replace iris_vpu_dec_comv_size(). It derives num_comv dynamically, it uses inst->fw_min_count once the firmware has reported its minimum buffer requirements, and fallback to inst->buffers[BUF_OUTPUT].min_count during initialization before firmware has communicated its requirements. This aligns the COMV buffer size to the actual count needed rather than always allocating with fixed VIDEO_MAX_FRAME value. Additionally, during iris_vdec_inst_init(), fw_min_count was initialized to MIN_BUFFERS instead of 0. This masked the fallback logic and caused the COMV size calculation to use MIN_BUFFERS even before firmware had reported its actual requirements. Fix this by initializing fw_min_count to 0. During testing of 1080p AVC, it reduces the COMV buffer size from 32.89MB to 6.16MB per decode session, significantly reducing memory consumption. Signed-off-by: Vishnu Reddy --- drivers/media/platform/qcom/iris/iris_vdec.c | 2 +- drivers/media/platform/qcom/iris/iris_vpu_buffer.c | 24 +++++++++++++++++++--- drivers/media/platform/qcom/iris/iris_vpu_buffer.h | 1 + 3 files changed, 23 insertions(+), 4 deletions(-) diff --git a/drivers/media/platform/qcom/iris/iris_vdec.c b/drivers/media/platform/qcom/iris/iris_vdec.c index 719217399a30..f433065e08b2 100644 --- a/drivers/media/platform/qcom/iris/iris_vdec.c +++ b/drivers/media/platform/qcom/iris/iris_vdec.c @@ -24,7 +24,7 @@ int iris_vdec_inst_init(struct iris_inst *inst) inst->fmt_src = kzalloc_obj(*inst->fmt_src); inst->fmt_dst = kzalloc_obj(*inst->fmt_dst); - inst->fw_min_count = MIN_BUFFERS; + inst->fw_min_count = 0; f = inst->fmt_src; f->type = V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE; diff --git a/drivers/media/platform/qcom/iris/iris_vpu_buffer.c b/drivers/media/platform/qcom/iris/iris_vpu_buffer.c index 9270422c1601..57237543b229 100644 --- a/drivers/media/platform/qcom/iris/iris_vpu_buffer.c +++ b/drivers/media/platform/qcom/iris/iris_vpu_buffer.c @@ -731,6 +731,23 @@ static u32 iris_vpu_dec_comv_size(struct iris_inst *inst) u32 height = f->fmt.pix_mp.height; u32 width = f->fmt.pix_mp.width; + if (inst->codec == V4L2_PIX_FMT_H264) + return hfi_buffer_comv_h264d(width, height, num_comv); + else if (inst->codec == V4L2_PIX_FMT_HEVC) + return hfi_buffer_comv_h265d(width, height, num_comv); + + return 0; +} + +static u32 iris_vpu3x_4x_dec_comv_size(struct iris_inst *inst) +{ + struct v4l2_format *f = inst->fmt_src; + u32 height = f->fmt.pix_mp.height; + u32 width = f->fmt.pix_mp.width; + u32 num_comv; + + num_comv = inst->fw_min_count ? inst->fw_min_count : inst->buffers[BUF_OUTPUT].min_count; + if (inst->codec == V4L2_PIX_FMT_H264) return hfi_buffer_comv_h264d(width, height, num_comv); else if (inst->codec == V4L2_PIX_FMT_HEVC) @@ -739,7 +756,8 @@ static u32 iris_vpu_dec_comv_size(struct iris_inst *inst) if (inst->fw_caps[DRAP].value) return 0; else - return hfi_buffer_comv_av1d(width, height, num_comv); + return hfi_buffer_comv_av1d(width, height, + num_comv + AV1D_COMV_BUFFER_OVERHEAD); } return 0; @@ -2025,7 +2043,7 @@ u32 iris_vpu_buf_size(struct iris_inst *inst, enum iris_buffer_type buffer_type) static const struct iris_vpu_buf_type_handle dec_internal_buf_type_handle[] = { {BUF_BIN, iris_vpu_dec_bin_size }, - {BUF_COMV, iris_vpu_dec_comv_size }, + {BUF_COMV, iris_vpu3x_4x_dec_comv_size }, {BUF_NON_COMV, iris_vpu_dec_non_comv_size }, {BUF_LINE, iris_vpu_dec_line_size }, {BUF_PERSIST, iris_vpu_dec_persist_size }, @@ -2098,7 +2116,7 @@ u32 iris_vpu4x_buf_size(struct iris_inst *inst, enum iris_buffer_type buffer_typ static const struct iris_vpu_buf_type_handle dec_internal_buf_type_handle[] = { {BUF_BIN, iris_vpu_dec_bin_size }, - {BUF_COMV, iris_vpu_dec_comv_size }, + {BUF_COMV, iris_vpu3x_4x_dec_comv_size }, {BUF_NON_COMV, iris_vpu_dec_non_comv_size }, {BUF_LINE, iris_vpu4x_dec_line_size }, {BUF_PERSIST, iris_vpu4x_dec_persist_size }, diff --git a/drivers/media/platform/qcom/iris/iris_vpu_buffer.h b/drivers/media/platform/qcom/iris/iris_vpu_buffer.h index 12640eb5ed8c..7a9cc1c92da3 100644 --- a/drivers/media/platform/qcom/iris/iris_vpu_buffer.h +++ b/drivers/media/platform/qcom/iris/iris_vpu_buffer.h @@ -110,6 +110,7 @@ struct iris_inst; #define MAX_PE_NBR_DATA_LCU16_LINE_BUFFER_SIZE 96 #define AV1D_NUM_HW_PIC_BUF 16 #define AV1D_NUM_FRAME_HEADERS 16 +#define AV1D_COMV_BUFFER_OVERHEAD 7 #define SIZE_AV1D_SEQUENCE_HEADER 768 #define SIZE_AV1D_METADATA 512 #define SIZE_AV1D_FRAME_HEADER 1280 --- base-commit: 4fbeef21f5387234111b5d52924e77757626faa5 change-id: 20260421-optimize_comv_buffer-ae7107673609 Best regards, -- Vishnu Reddy