linux-kernel - Re: [PATCH v2 5/5] media: iris: Add internal buffer calculation for AV1 decoder

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Message-ID: <59402591-f657-4b54-954a-4bf08d92d793@oss.qualcomm.com>
Date: Tue, 28 Oct 2025 19:56:49 -0700
From: Deepa Guthyappa Madivalara <deepa.madivalara@....qualcomm.com>
To: Dikshita Agarwal <dikshita.agarwal@....qualcomm.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Vikash Garodia <vikash.garodia@....qualcomm.com>,
        Abhinav Kumar <abhinav.kumar@...ux.dev>,
        Bryan O'Donoghue <bod@...nel.org>
Cc: linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, kernel test robot <lkp@...el.com>
Subject: Re: [PATCH v2 5/5] media: iris: Add internal buffer calculation for
 AV1 decoder


On 10/27/2025 2:07 AM, Dikshita Agarwal wrote:
>
> On 10/18/2025 12:05 AM, Deepa Guthyappa Madivalara wrote:
>> Implement internal buffer count and size calculations for AV1 decoder
>> for all the buffer types required by the AV1 decoder, including BIN,
>> COMV, PERSIST, LINE, and PARTIAL.
>>
>> This ensures the hardware decoder has properly allocated memory for AV1
>> decoding operations, enabling correct AV1 video playback.
>>
>> Signed-off-by: Deepa Guthyappa Madivalara <deepa.madivalara@....qualcomm.com>
>> ---
>>   drivers/media/platform/qcom/iris/iris_buffer.h     |   1 +
>>   drivers/media/platform/qcom/iris/iris_vpu_buffer.c | 298 ++++++++++++++++++++-
>>   drivers/media/platform/qcom/iris/iris_vpu_buffer.h | 116 ++++++++
>>   3 files changed, 411 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/media/platform/qcom/iris/iris_buffer.h b/drivers/media/platform/qcom/iris/iris_buffer.h
>> index 5ef365d9236c7cbdee24a4614789b3191881968b..75bb767761824c4c02e0df9b765896cc093be333 100644
>> --- a/drivers/media/platform/qcom/iris/iris_buffer.h
>> +++ b/drivers/media/platform/qcom/iris/iris_buffer.h
>> @@ -27,6 +27,7 @@ struct iris_inst;
>>    * @BUF_SCRATCH_1: buffer to store decoding/encoding context data for HW
>>    * @BUF_SCRATCH_2: buffer to store encoding context data for HW
>>    * @BUF_VPSS: buffer to store VPSS context data for HW
>> + * @BUF_PARTIAL: buffer for AV1 IBC data
>>    * @BUF_TYPE_MAX: max buffer types
>>    */
>>   enum iris_buffer_type {
>> diff --git a/drivers/media/platform/qcom/iris/iris_vpu_buffer.c b/drivers/media/platform/qcom/iris/iris_vpu_buffer.c
>> index 4463be05ce165adef6b152eb0c155d2e6a7b3c36..e03ae7cfc9551dd2450b27d5d19ef1d23bba4c99 100644
>> --- a/drivers/media/platform/qcom/iris/iris_vpu_buffer.c
>> +++ b/drivers/media/platform/qcom/iris/iris_vpu_buffer.c
>> @@ -9,6 +9,17 @@
>>   #include "iris_hfi_gen2_defines.h"
>>   
> <snip>
>
>>   static u32 iris_vpu_dec_bin_size(struct iris_inst *inst)
>>   {
>>   	u32 num_vpp_pipes = inst->core->iris_platform_data->num_vpp_pipe;
>> @@ -472,6 +718,8 @@ static u32 iris_vpu_dec_bin_size(struct iris_inst *inst)
>>   		return hfi_buffer_bin_h265d(width, height, num_vpp_pipes);
>>   	else if (inst->codec == V4L2_PIX_FMT_VP9)
>>   		return hfi_buffer_bin_vp9d(width, height, num_vpp_pipes);
>> +	else if (inst->codec == V4L2_PIX_FMT_AV1)
>> +		return hfi_buffer_bin_av1d(width, height, num_vpp_pipes);
>>   
>>   	return 0;
>>   }
>> @@ -487,18 +735,33 @@ static u32 iris_vpu_dec_comv_size(struct iris_inst *inst)
>>   		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);
>> -
>> +	else if (inst->codec == V4L2_PIX_FMT_AV1) {
>> +		if (inst->fw_caps[DRAP].value)
>> +			return 0;
>> +		else
>> +			return hfi_buffer_comv_av1d(width, height, num_comv);
>> +	}
> newline is required before return.
<ack>
>
>>   	return 0;
>>   }
>>   
> <snip>
>
>> +static u32 iris_vpu_dec_partial_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;
>> +
>> +	return hfi_buffer_ibc_av1d(width, height);
>> +}
>> +
>>   static inline
>>   u32 hfi_buffer_comv_enc(u32 frame_width, u32 frame_height, u32 lcu_size,
>>   			u32 num_recon, u32 standard)
>> @@ -1414,7 +1688,9 @@ static int output_min_count(struct iris_inst *inst)
>>   
>>   	/* fw_min_count > 0 indicates reconfig event has already arrived */
>>   	if (inst->fw_min_count) {
>> -		if (iris_split_mode_enabled(inst) && inst->codec == V4L2_PIX_FMT_VP9)
>> +		if (iris_split_mode_enabled(inst) &&
>> +		    (inst->codec == V4L2_PIX_FMT_VP9 ||
>> +		     inst->codec == V4L2_PIX_FMT_VP9))
> This change doesn't make any sense, do you mean V4L2_PIX_FMT_AV1?
Yes, updated in v3
>
>>   			return min_t(u32, 4, inst->fw_min_count);
>>   		else
>>   			return inst->fw_min_count;
>> @@ -1422,6 +1698,8 @@ static int output_min_count(struct iris_inst *inst)
>>   
>>   	if (inst->codec == V4L2_PIX_FMT_VP9)
>>   		output_min_count = 9;
>> +	else if (inst->codec == V4L2_PIX_FMT_AV1)
>> +		output_min_count = 11;
>>   
>>   	return output_min_count;
>>   }
>> @@ -1444,6 +1722,7 @@ u32 iris_vpu_buf_size(struct iris_inst *inst, enum iris_buffer_type buffer_type)
>>   		{BUF_PERSIST,     iris_vpu_dec_persist_size         },
>>   		{BUF_DPB,         iris_vpu_dec_dpb_size             },
>>   		{BUF_SCRATCH_1,   iris_vpu_dec_scratch1_size        },
>> +		{BUF_PARTIAL,     iris_vpu_dec_partial_size         },
>>   	};
>>