linux-kernel - Re: [PATCH v5 11/14] media: mtk-vcodec: vdec: support stateless H.264 decoding

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Date:   Fri, 21 May 2021 21:38:13 +0800
From:   Tzung-Bi Shih <tzungbi@...gle.com>
To:     Alexandre Courbot <acourbot@...omium.org>
Cc:     Tiffany Lin <tiffany.lin@...iatek.com>,
        Andrew-CT Chen <andrew-ct.chen@...iatek.com>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Dafna Hirschfeld <dafna.hirschfeld@...labora.com>,
        Yunfei Dong <yunfei.dong@...iatek.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>
Subject: Re: [PATCH v5 11/14] media: mtk-vcodec: vdec: support stateless H.264 decoding

On Wed, May 19, 2021 at 10:31 PM Alexandre Courbot
<acourbot@...omium.org> wrote:
> +#include "../vdec_drv_if.h"
> +#include "../mtk_vcodec_util.h"
> +#include "../mtk_vcodec_dec.h"
> +#include "../mtk_vcodec_intr.h"
> +#include "../vdec_vpu_if.h"
> +#include "../vdec_drv_base.h"

Would be good practice to sort them.

> +static int allocate_predication_buf(struct vdec_h264_slice_inst *inst)
> +{
> +       int err = 0;

No need to initialize.  It will be overridden soon.

> +static void free_predication_buf(struct vdec_h264_slice_inst *inst)
> +{
> +       struct mtk_vcodec_mem *mem = NULL;
> +
> +       mtk_vcodec_debug_enter(inst);
> +
> +       inst->vsi_ctx.pred_buf_dma = 0;
> +       mem = &inst->pred_buf;

Is it possible to inline to the variable declaration?  Or mem no need
to initialize.

> +static int alloc_mv_buf(struct vdec_h264_slice_inst *inst,
> +       struct vdec_pic_info *pic)
> +{
> +       int i;
> +       int err;
> +       struct mtk_vcodec_mem *mem = NULL;

No need to initialize.  It will be overridden soon.

> +static void free_mv_buf(struct vdec_h264_slice_inst *inst)
> +{
> +       int i;
> +       struct mtk_vcodec_mem *mem = NULL;

No need to initialize.  It will be overridden soon.

> +static int vdec_h264_slice_init(struct mtk_vcodec_ctx *ctx)
> +{
> +       struct vdec_h264_slice_inst *inst = NULL;

No need to initialize.  It will be overridden soon.

> +static void vdec_h264_slice_deinit(void *h_vdec)
> +{
> +       struct vdec_h264_slice_inst *inst =
> +               (struct vdec_h264_slice_inst *)h_vdec;

No need to cast from void *.

> +static int vdec_h264_slice_decode(void *h_vdec, struct mtk_vcodec_mem *bs,
> +                                 struct vdec_fb *fb, bool *res_chg)
> +{
> +       struct vdec_h264_slice_inst *inst =
> +               (struct vdec_h264_slice_inst *)h_vdec;

No need to cast from void *.

> +       const struct v4l2_ctrl_h264_decode_params *dec_params =
> +               get_ctrl_ptr(inst->ctx, V4L2_CID_STATELESS_H264_DECODE_PARAMS);
> +       struct vdec_vpu_inst *vpu = &inst->vpu;
> +       uint32_t data[2];
> +       uint64_t y_fb_dma;
> +       uint64_t c_fb_dma;
> +       int err;
> +
> +       /* bs NULL means flush decoder */
> +       if (bs == NULL)

To neat, !bs.

> +static int vdec_h264_slice_get_param(void *h_vdec,
> +                              enum vdec_get_param_type type, void *out)
> +{
> +       struct vdec_h264_slice_inst *inst =
> +               (struct vdec_h264_slice_inst *)h_vdec;

No need to cast from void *.