linux-kernel - Re: [PATCH v3 5/6] venus: Add a handling of QC10C compressed format

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Date:   Wed, 16 Feb 2022 11:20:12 -0500
From:   Nicolas Dufresne <nicolas@...fresne.ca>
To:     Stanimir Varbanov <stanimir.varbanov@...aro.org>,
        linux-media@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-api@...r.kernel.org
Cc:     hverkuil-cisco@...all.nl
Subject: Re: [PATCH v3 5/6] venus: Add a handling of QC10C compressed format

Le lundi 17 janvier 2022 à 17:55 +0200, Stanimir Varbanov a écrit :
> This adds QC10C compressed pixel format in the Venus driver, and
> make it possible to discover from v4l2 clients.
> 
> Note: The QC10C format shouldn't be possible to discpver by the

discpver -> discover

It is not super clear though, did you mean to say that it won't be enumerated
after the header have been parsed ?

> client if the decoded bitstream is not 10-bits.
> 
> Signed-off-by: Stanimir Varbanov <stanimir.varbanov@...aro.org>
> ---
>  drivers/media/platform/qcom/venus/helpers.c | 26 ++++-----------------
>  drivers/media/platform/qcom/venus/vdec.c    | 19 ++++++++++++---
>  2 files changed, 20 insertions(+), 25 deletions(-)
> 
> diff --git a/drivers/media/platform/qcom/venus/helpers.c b/drivers/media/platform/qcom/venus/helpers.c
> index adbfa4fbe139..69a9a9471a27 100644
> --- a/drivers/media/platform/qcom/venus/helpers.c
> +++ b/drivers/media/platform/qcom/venus/helpers.c
> @@ -594,6 +594,8 @@ static u32 to_hfi_raw_fmt(u32 v4l2_fmt)
>  		return HFI_COLOR_FORMAT_NV21;
>  	case V4L2_PIX_FMT_QC08C:
>  		return HFI_COLOR_FORMAT_NV12_UBWC;
> +	case V4L2_PIX_FMT_QC10C:
> +		return HFI_COLOR_FORMAT_YUV420_TP10_UBWC;
>  	default:
>  		break;
>  	}
> @@ -1176,7 +1178,8 @@ int venus_helper_set_format_constraints(struct venus_inst *inst)
>  	if (!IS_V6(inst->core))
>  		return 0;
>  
> -	if (inst->opb_fmt == HFI_COLOR_FORMAT_NV12_UBWC)
> +	if (inst->opb_fmt == HFI_COLOR_FORMAT_NV12_UBWC ||
> +	    inst->opb_fmt == HFI_COLOR_FORMAT_YUV420_TP10_UBWC)
>  		return 0;
>  
>  	pconstraint.buffer_type = HFI_BUFFER_OUTPUT2;
> @@ -1747,27 +1750,6 @@ int venus_helper_get_out_fmts(struct venus_inst *inst, u32 v4l2_fmt,
>  	if (!caps)
>  		return -EINVAL;
>  
> -	if (inst->bit_depth == VIDC_BITDEPTH_10 &&
> -	    inst->session_type == VIDC_SESSION_TYPE_DEC) {
> -		found_ubwc =
> -			find_fmt_from_caps(caps, HFI_BUFFER_OUTPUT,
> -					   HFI_COLOR_FORMAT_YUV420_TP10_UBWC);
> -		found = find_fmt_from_caps(caps, HFI_BUFFER_OUTPUT2,
> -					   HFI_COLOR_FORMAT_NV12);
> -		if (found_ubwc && found) {
> -			/*
> -			 * Hard-code DPB buffers to be 10bit UBWC and decoder
> -			 * output buffers in 8bit NV12 until V4L2 is able to
> -			 * expose compressed/tiled formats to applications.
> -			 */
> -			*out_fmt = HFI_COLOR_FORMAT_YUV420_TP10_UBWC;
> -			*out2_fmt = HFI_COLOR_FORMAT_NV12;
> -			return 0;
> -		}
> -
> -		return -EINVAL;
> -	}
> -
>  	if (ubwc) {
>  		ubwc_fmt = fmt | HFI_COLOR_FORMAT_UBWC_BASE;
>  		found_ubwc = find_fmt_from_caps(caps, HFI_BUFFER_OUTPUT,
> diff --git a/drivers/media/platform/qcom/venus/vdec.c b/drivers/media/platform/qcom/venus/vdec.c
> index eb02e45a512b..c8261c6cb0fb 100644
> --- a/drivers/media/platform/qcom/venus/vdec.c
> +++ b/drivers/media/platform/qcom/venus/vdec.c
> @@ -35,6 +35,10 @@ static const struct venus_format vdec_formats[] = {
>  		.num_planes = 1,
>  		.type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE,
>  	}, {
> +		.pixfmt = V4L2_PIX_FMT_QC10C,
> +		.num_planes = 1,
> +		.type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE,
> +	},{
>  		.pixfmt = V4L2_PIX_FMT_NV12,
>  		.num_planes = 1,
>  		.type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE,
> @@ -114,6 +118,10 @@ find_format(struct venus_inst *inst, u32 pixfmt, u32 type)
>  	    !venus_helper_check_format(inst, fmt[i].pixfmt))
>  		return NULL;
>  
> +	if (V4L2_TYPE_IS_CAPTURE(type) && fmt[i].pixfmt == V4L2_PIX_FMT_QC10C &&
> +	    !(inst->bit_depth == VIDC_BITDEPTH_10))
> +		return NULL;
> +
>  	return &fmt[i];
>  }
>  
> @@ -133,11 +141,16 @@ find_format_by_index(struct venus_inst *inst, unsigned int index, u32 type)
>  		if (fmt[i].type != type)
>  			continue;
>  
> -		if (V4L2_TYPE_IS_OUTPUT(type))
> +		if (V4L2_TYPE_IS_OUTPUT(type)) {
>  			valid = venus_helper_check_codec(inst, fmt[i].pixfmt);
> -		else if (V4L2_TYPE_IS_CAPTURE(type))
> +		} else if (V4L2_TYPE_IS_CAPTURE(type)) {
>  			valid = venus_helper_check_format(inst, fmt[i].pixfmt);
>  
> +			if (fmt[i].pixfmt == V4L2_PIX_FMT_QC10C &&
> +			    !(inst->bit_depth == VIDC_BITDEPTH_10))
> +				valid = false;
> +		}
> +
>  		if (k == index && valid)
>  			break;
>  		if (valid)
> @@ -1537,7 +1550,7 @@ static const struct hfi_inst_ops vdec_hfi_ops = {
>  static void vdec_inst_init(struct venus_inst *inst)
>  {
>  	inst->hfi_codec = HFI_VIDEO_CODEC_H264;
> -	inst->fmt_out = &vdec_formats[7];
> +	inst->fmt_out = &vdec_formats[8];
>  	inst->fmt_cap = &vdec_formats[0];
>  	inst->width = frame_width_min(inst);
>  	inst->height = ALIGN(frame_height_min(inst), 32);