linux-kernel - Re: [PATCH v3 3/4] media: mediatek: add MT8188 AIE driver

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Message-ID: <351287f9e8a118babd225fb0e484976bef3db6c0.camel@mediatek.com>
Date: Fri, 27 Dec 2024 06:05:24 +0000
From: CK Hu (胡俊光) <ck.hu@...iatek.com>
To: "robh@...nel.org" <robh@...nel.org>, "mchehab@...nel.org"
	<mchehab@...nel.org>, "krzk+dt@...nel.org" <krzk+dt@...nel.org>,
	Bo Kong (孔波) <Bo.Kong@...iatek.com>
CC: "linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
	Project_Global_Chrome_Upstream_Group
	<Project_Global_Chrome_Upstream_Group@...iatek.com>, "AngeloGioacchino Del
 Regno" <angelogioacchino.delregno@...labora.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org"
	<linux-arm-kernel@...ts.infradead.org>, "conor+dt@...nel.org"
	<conor+dt@...nel.org>, "linux-mediatek@...ts.infradead.org"
	<linux-mediatek@...ts.infradead.org>, "matthias.bgg@...il.com"
	<matthias.bgg@...il.com>
Subject: Re: [PATCH v3 3/4] media: mediatek: add MT8188 AIE driver

On Wed, 2024-12-25 at 17:00 +0800, bo.kong wrote:
> From: Bo Kong <Bo.Kong@...iatek.com>
> 
> Add a V4L2 sub-device driver for MT8188 AIE.
> 
> Signed-off-by: Bo Kong <Bo.Kong@...iatek.com>
> ---

[snip]

> +static void aie_reset_output_buf(struct mtk_aie_dev *fd,
> +				 struct aie_enq_info *aie_cfg)
> +{

Why clear output buffer?
Could you point out which place in the output buffer that hardware does not write data into but software would read it?

Regards,
CK

> +	if (aie_cfg->sel_mode == FDMODE) {
> +		memset(fd->rs_output_hw.va, 0, fd->rs_output_hw.size);
> +		memset(fd->dma_para->fd_out_hw_va[RPN0_LOOP_NUM][0], 0,
> +		       RESULT_SIZE);
> +		memset(fd->dma_para->fd_out_hw_va[RPN1_LOOP_NUM][0], 0,
> +		       RESULT_SIZE);
> +		memset(fd->dma_para->fd_out_hw_va[RPN2_LOOP_NUM][0], 0,
> +		       RESULT_SIZE);
> +	} else if (aie_cfg->sel_mode == ATTRIBUTEMODE) {
> +		memset(fd->base_para->rs_pym_rst_va[0][0], 0,
> +		       fd->rs_pym_out_size[0]);
> +		memset(fd->base_para->rs_pym_rst_va[0][1], 0,
> +		       fd->rs_pym_out_size[0]);
> +		memset(fd->base_para->rs_pym_rst_va[0][2], 0,
> +		       fd->rs_pym_out_size[0]);
> +	} else if (aie_cfg->sel_mode == FLDMODE) {
> +		if (fd->variant->fld_enable)
> +			memset(fd->fld_para->fld_output_va[0], 0,
> +			       FLD_MAX_FRAME * FLD_OUTPUT_SIZE);
> +	}
> +}
> +