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Date:   Wed, 25 Aug 2021 02:54:53 +0800
From:   Tzung-Bi Shih <tzungbi@google.com>
To:     Irui Wang <irui.wang@mediatek.com>
Cc:     Hans Verkuil <hverkuil-cisco@xs4all.nl>,
        Tzung-Bi Shih <tzungbi@chromium.org>,
        Alexandre Courbot <acourbot@chromium.org>,
        Tiffany Lin <tiffany.lin@mediatek.com>,
        Andrew-CT Chen <andrew-ct.chen@mediatek.com>,
        Mauro Carvalho Chehab <mchehab@kernel.org>,
        Rob Herring <robh+dt@kernel.org>,
        Matthias Brugger <matthias.bgg@gmail.com>,
        Tomasz Figa <tfiga@google.com>, Yong Wu <yong.wu@mediatek.com>,
        Hsin-Yi Wang <hsinyi@chromium.org>,
        Maoguang Meng <maoguang.meng@mediatek.com>,
        Longfei Wang <longfei.wang@mediatek.com>,
        Yunfei Dong <yunfei.dong@mediatek.com>,
        Fritz Koenig <frkoenig@chromium.org>,
        linux-media@vger.kernel.org, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        srv_heupstream@mediatek.com, linux-mediatek@lists.infradead.org,
        Project_Global_Chrome_Upstream_Group@mediatek.com
Subject: Re: [PATCH 6/9] media: mtk-vcodec: Add new venc drv interface for
 frame_racing mode
Message-ID: <YSVAfbC93/PzPuuZ@google.com>
References: <20210816105934.28265-1-irui.wang@mediatek.com>
 <20210816105934.28265-7-irui.wang@mediatek.com>
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In-Reply-To: <20210816105934.28265-7-irui.wang@mediatek.com>
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On Mon, Aug 16, 2021 at 06:59:31PM +0800, Irui Wang wrote:
> Frame-racing mode encoding need more venc working buffers, it
> will break the compatibility if we just add venc_vsi in AP-Kernel
> but not in firmware, so add a new venc driver interface to
> distinguish the sigle_core_mode and frame_racing mode.
> 
> The new driver interface can be used for different codecs in
> the future.
The patch contains more code than the commit message explains that I couldn't understand.  Only find some nits.

> --- a/drivers/media/platform/mtk-vcodec/mtk_vcodec_util.c
> +++ b/drivers/media/platform/mtk-vcodec/mtk_vcodec_util.c
> @@ -9,6 +9,7 @@
>  
>  #include "mtk_vcodec_drv.h"
>  #include "mtk_vcodec_util.h"
> +#include "mtk_vcodec_enc_hw.h"
Please try to maintain the order.

> +void __iomem *mtk_get_venc_comp_reg_addr(struct mtk_vcodec_ctx *data,
> +					 unsigned int hw_id)
> +{
> +	struct mtk_vcodec_ctx *ctx = (struct mtk_vcodec_ctx *)data;
typeof(ctx) == typeof(data), rename the function argument 'data' to 'ctx'.

> +static int venc_alloc_work_buf(struct venc_common_inst *inst)
> +{
> +	int i;
> +	int ret = 0;
It doesn't need to be initialized.  See comment below.

> +	mtk_vcodec_debug_leave(inst);
> +
> +	return ret;
It is more clear if just return 0 here.  In the meantime, ret doesn't need to be initialized.

> +static unsigned int venc_wait_comp_done(struct venc_common_inst *inst,
> +					unsigned int hw_id)
> +{
> +	unsigned int irq_status = 0;
> +	struct mtk_vcodec_ctx *ctx = (struct mtk_vcodec_ctx *)inst->ctx;
No need to cast.

> +static int venc_encode_sps(struct venc_common_inst *inst,
> +			   struct mtk_vcodec_mem *bs_buf,
> +			   unsigned int *bs_size)
> +{
> +	int ret = 0;
Same.

> +	*bs_size = venc_read_reg(inst, VENC_PIC_BITSTREAM_BYTE_CNT,
> +				 MTK_VENC_CORE0);
> +	mtk_vcodec_debug(inst, "bs size %d <-", *bs_size);
> +
> +	return ret;
Same.

> +static int venc_encode_pps(struct venc_common_inst *inst,
> +			   struct mtk_vcodec_mem *bs_buf,
> +			   unsigned int *bs_size)
> +{
> +	int ret = 0;
Same.

> +	*bs_size = venc_read_reg(inst, VENC_PIC_BITSTREAM_BYTE_CNT,
> +				 MTK_VENC_CORE0);
> +	mtk_vcodec_debug(inst, "bs size %d <-", *bs_size);
> +
> +	return ret;
Same.

> +static int venc_encode_header(struct venc_common_inst *inst,
> +			      struct mtk_vcodec_mem *bs_buf,
> +			      unsigned int *bs_size)
> +{
> +	int ret = 0;
Same.

> +	memcpy(bs_buf->va + bs_size_sps, inst->pps_buf.va, bs_size_pps);
> +	*bs_size = bs_size_sps + bs_size_pps;
> +
> +	return ret;
Same.

> +static int venc_encode_frame(struct venc_common_inst *inst,
> +			     struct venc_frm_buf *frm_buf,
> +			     struct mtk_vcodec_mem *bs_buf,
> +			     unsigned int *bs_size,
> +			     int hw_id)
> +{
> +	int ret = 0;
Same.

> +	++inst->frm_cnt;
> +	mtk_vcodec_debug(inst, "frm %d bs_size %d key_frm %d <-",
> +			 inst->frm_cnt, *bs_size, inst->vpu_inst.is_key_frm);
> +
> +	return ret;
Same.

> +static void h264_encode_filler(struct venc_common_inst *inst, void *buf,
> +			       int size)
> +{
> +	unsigned char *p = buf;
> +
> +	if (size < H264_FILLER_MARKER_SIZE) {
> +		mtk_vcodec_err(inst, "filler size too small %d", size);
> +		return;
> +	}
> +
> +	memcpy(p, h264_filler_marker, ARRAY_SIZE(h264_filler_marker));
Replace ARRAY_SIZE(h264_filler_marker) to H264_FILLER_MARKER_SIZE.

> +static int venc_init(struct mtk_vcodec_ctx *ctx)
> +{
> +	int i;
> +	int ret = 0;
> +	struct venc_common_inst *inst;
> +
> +	inst = kzalloc(sizeof(*inst), GFP_KERNEL);
> +	if (!inst)
> +		return -ENOMEM;
> +
> +	inst->ctx = ctx;
> +	inst->vpu_inst.ctx = ctx;
> +	inst->vpu_inst.id = SCP_IPI_VENC_H264;
> +
> +	mtk_vcodec_debug_enter(inst);
> +
> +	ret = vpu_enc_init(&inst->vpu_inst);
> +
> +	inst->vsi = (struct venc_vsi *)inst->vpu_inst.vsi;
No need to cast.

> +static int venc_encode(void *handle,
> +		       enum venc_start_opt opt,
> +		       struct venc_frm_buf *frm_buf,
> +		       struct mtk_vcodec_mem *bs_buf,
> +		       struct venc_done_result *result)
> +{
> +	int ret;
> +	struct venc_common_inst *inst = (struct venc_common_inst *)handle;
No need to cast.

> +	default:
> +		mtk_vcodec_err(inst, "venc_start_opt %d not supported", opt);
> +		return -EINVAL;
> +	}
> +
> +	return ret;
It is more clear if just return 0 here.

> +static int venc_set_param(void *handle,
> +			  enum venc_set_param_type type,
> +			  struct venc_enc_param *enc_prm)
> +{
> +	int ret = 0;
> +	struct venc_common_inst *inst = (struct venc_common_inst *)handle;
No need to cast.

> +static int venc_deinit(void *handle)
> +{
> +	int ret = 0;
Same.

> +	struct venc_common_inst *inst = (struct venc_common_inst *)handle;
No need to cast.

> +	mtk_vcodec_debug_leave(inst);
> +	kfree(inst);
> +
> +	return ret;
Same.