linux-kernel - Re: [PATCH 4/4] venus: return P010 as preferred format for 10 bit decode

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Date:   Thu, 4 May 2023 19:20:55 +0200
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Dikshita Agarwal <quic_dikshita@...cinc.com>,
        linux-media@...r.kernel.org, stanimir.k.varbanov@...il.com,
        quic_vgarodia@...cinc.com, agross@...nel.org, andersson@...nel.org,
        mchehab@...nel.org
Cc:     linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH 4/4] venus: return P010 as preferred format for 10 bit
 decode



On 4.05.2023 12:36, Dikshita Agarwal wrote:
> If bit depth is detected as 10 bit by firmware, return
> P010 as preferred decoder format to the client.
> 
> Signed-off-by: Dikshita Agarwal <quic_dikshita@...cinc.com>
> ---
>  drivers/media/platform/qcom/venus/vdec.c | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/media/platform/qcom/venus/vdec.c b/drivers/media/platform/qcom/venus/vdec.c
> index 69f7f6e..ed11dc2 100644
> --- a/drivers/media/platform/qcom/venus/vdec.c
> +++ b/drivers/media/platform/qcom/venus/vdec.c
> @@ -1468,8 +1468,13 @@ static void vdec_event_change(struct venus_inst *inst,
>  	inst->out_width = ev_data->width;
>  	inst->out_height = ev_data->height;
>  
> -	if (inst->bit_depth != ev_data->bit_depth)
> +	if (inst->bit_depth != ev_data->bit_depth) {
>  		inst->bit_depth = ev_data->bit_depth;
> +		if (inst->bit_depth == VIDC_BITDEPTH_10)
> +			inst->fmt_cap = &vdec_formats[3];
> +		else
> +			inst->fmt_cap = &vdec_formats[0];
This doesn't scale and is very error-prone, please enumerate the
entries and assign it using the enumerator, like:

enum {
	VDEC_FORMAT_FOO,
	...
};

... vdec_formats[] = {
	[VDEC_FORMAT_FOO] = { foo, bar, baz }
}

Konrad
> +	}
>  
>  	if (inst->pic_struct != ev_data->pic_struct)
>  		inst->pic_struct = ev_data->pic_struct;