linux-kernel - Re: [PATCH 1/2] media: amphion: Support display delay for Hevc format

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Message-ID: <6fcdd612-0f1e-42bd-b171-6f1d70790ffd@oss.nxp.com>
Date: Tue, 7 Jan 2025 09:29:22 +0800
From: "Ming Qian(OSS)" <ming.qian@....nxp.com>
To: Nicolas Dufresne <nicolas@...fresne.ca>, mchehab@...nel.org,
 hverkuil-cisco@...all.nl
Cc: shawnguo@...nel.org, robh+dt@...nel.org, s.hauer@...gutronix.de,
 kernel@...gutronix.de, festevam@...il.com, linux-imx@....com,
 xiahong.bao@....com, eagle.zhou@....com, tao.jiang_2@....com,
 imx@...ts.linux.dev, linux-media@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 1/2] media: amphion: Support display delay for Hevc format

Hi Nicolas,


On 2025/1/7 6:16, Nicolas Dufresne wrote:
> Hi,
> 
> nit: use capital HEVC in the subject
> 

I'll fix it in the v2 patch

> Le jeudi 19 décembre 2024 à 10:51 +0900, Ming Qian a écrit :
>> The amphion decoder firmware v1.9.0 supports display delay 0 for
>> hevc format, then driver can enable this feature.
> 
> nit: HEVC
> 
> I think this added "feature" hides a bug you haven't fixed in this patch.
> 
> 
>          v4l2_ctrl_new_std(&inst->ctrl_handler, &vdec_ctrl_ops,
>                            V4L2_CID_MPEG_VIDEO_DEC_DISPLAY_DELAY_ENABLE,
>                            0, 1, 1, 0);
> 
> With the control registered this way, 0 is the default, and the range of 0-1.
> But from your commit message, this is only supported from firmware 1.9.0 and up.
> I think the patch should basically adjust the min and def values according to
> the detected firmware version.
> 
> This might actually be more complex, aka per CODEC, and for that you may want to
> use v4l2_ctrl_config structure.
> 
> Nicolas
> 

Thanks for the tip.
By the way, how to define different ctrl values for each CODEC format?
Is it reasonable to new a ctrl after set capture format?
Or can we change the min/max value after set capture format?

Thanks,
Ming

> 
>> Signed-off-by: Ming Qian <ming.qian@....nxp.com>
>> ---
>>   drivers/media/platform/amphion/vpu_malone.c | 14 +++++++++++---
>>   1 file changed, 11 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/media/platform/amphion/vpu_malone.c b/drivers/media/platform/amphion/vpu_malone.c
>> index 5c6b2a841b6f..8f4aa48b2d65 100644
>> --- a/drivers/media/platform/amphion/vpu_malone.c
>> +++ b/drivers/media/platform/amphion/vpu_malone.c
>> @@ -332,6 +332,8 @@ struct vpu_dec_ctrl {
>>   	u32 buf_addr[VID_API_NUM_STREAMS];
>>   };
>>   
>> +static const struct malone_padding_scode *get_padding_scode(u32 type, u32 fmt);
>> +
>>   u32 vpu_malone_get_data_size(void)
>>   {
>>   	return sizeof(struct vpu_dec_ctrl);
>> @@ -654,8 +656,10 @@ static int vpu_malone_set_params(struct vpu_shared_addr *shared,
>>   		hc->jpg[instance].jpg_mjpeg_interlaced = 0;
>>   	}
>>   
>> -	hc->codec_param[instance].disp_imm = params->display_delay_enable ? 1 : 0;
>> -	if (malone_format != MALONE_FMT_AVC)
>> +	if (params->display_delay_enable &&
>> +	    get_padding_scode(SCODE_PADDING_BUFFLUSH, params->codec_format))
>> +		hc->codec_param[instance].disp_imm = 1;
>> +	else
>>   		hc->codec_param[instance].disp_imm = 0;
>>   	hc->codec_param[instance].dbglog_enable = 0;
>>   	iface->dbglog_desc.level = 0;
>> @@ -1024,6 +1028,7 @@ static const struct malone_padding_scode padding_scodes[] = {
>>   	{SCODE_PADDING_EOS,      V4L2_PIX_FMT_JPEG,        {0x0, 0x0}},
>>   	{SCODE_PADDING_BUFFLUSH, V4L2_PIX_FMT_H264,        {0x15010000, 0x0}},
>>   	{SCODE_PADDING_BUFFLUSH, V4L2_PIX_FMT_H264_MVC,    {0x15010000, 0x0}},
>> +	{SCODE_PADDING_BUFFLUSH, V4L2_PIX_FMT_HEVC,        {0x3e010000, 0x20}},
>>   };
>>   
>>   static const struct malone_padding_scode padding_scode_dft = {0x0, 0x0};
>> @@ -1058,8 +1063,11 @@ static int vpu_malone_add_padding_scode(struct vpu_buffer *stream_buffer,
>>   	int ret;
>>   
>>   	ps = get_padding_scode(scode_type, pixelformat);
>> -	if (!ps)
>> +	if (!ps) {
>> +		if (scode_type == SCODE_PADDING_BUFFLUSH)
>> +			return 0;
>>   		return -EINVAL;
>> +	}
>>   
>>   	wptr = readl(&str_buf->wptr);
>>   	if (wptr < stream_buffer->phys || wptr > stream_buffer->phys + stream_buffer->length)
>