linux-kernel - Re: [PATCH v2 4/4] media: platform: mediatek: isp

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Date:   Sun, 2 Jul 2023 17:50:47 +0800
From:   Chun-Kuang Hu <chunkuang.hu@...nel.org>
To:     Julien Stephan <jstephan@...libre.com>
Cc:     Phi-bang Nguyen <pnguyen@...libre.com>,
        Florian Sylvestre <fsylvestre@...libre.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        Andy Hsieh <andy.hsieh@...iatek.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Conor Dooley <conor+dt@...nel.org>,
        daoyuan huang <daoyuan.huang@...iatek.com>,
        devicetree@...r.kernel.org,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-mediatek@...ts.infradead.org, linux-media@...r.kernel.org,
        Louis Kuo <louis.kuo@...iatek.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Moudy Ho <moudy.ho@...iatek.com>,
        Ping-Hsun Wu <ping-hsun.wu@...iatek.com>,
        Rob Herring <robh+dt@...nel.org>,
        Vasily Gorbik <gor@...ux.ibm.com>
Subject: Re: [PATCH v2 4/4] media: platform: mediatek: isp_30: add mediatek
 ISP3.0 camsv

Hi, Julien:

Julien Stephan <jstephan@...libre.com> 於 2023年6月30日 週五 下午6:06寫道：
>
> From: Phi-bang Nguyen <pnguyen@...libre.com>
>
> This driver provides a path to bypass the SoC ISP so that image data
> coming from the SENINF can go directly into memory without any image
> processing. This allows the use of an external ISP.
>
> Signed-off-by: Phi-bang Nguyen <pnguyen@...libre.com>
> Signed-off-by: Florian Sylvestre <fsylvestre@...libre.com>
> Signed-off-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
> Signed-off-by: Julien Stephan <jstephan@...libre.com>
> ---

[snip]

> +
> +static irqreturn_t isp_irq_camsv30(int irq, void *data)
> +{
> +       struct mtk_cam_dev *cam_dev = (struct mtk_cam_dev *)data;
> +       struct mtk_cam_dev_buffer *buf;
> +       unsigned long flags = 0;
> +       unsigned int irq_status;
> +
> +       spin_lock_irqsave(&cam_dev->irqlock, flags);
> +
> +       irq_status = mtk_camsv30_read(cam_dev, CAMSV_INT_STATUS);
> +
> +       if (irq_status & INT_ST_MASK_CAMSV_ERR) {
> +               dev_err(cam_dev->dev, "irq error 0x%x\n",
> +                       (unsigned int)(irq_status & INT_ST_MASK_CAMSV_ERR));
> +       }
> +
> +       /* De-queue frame */
> +       if (irq_status & CAMSV_IRQ_PASS1_DON) {
> +               cam_dev->sequence++;
> +
> +               if (!cam_dev->is_dummy_used) {
> +                       buf = list_first_entry_or_null(&cam_dev->buf_list,
> +                                                      struct mtk_cam_dev_buffer,
> +                                                      list);
> +                       if (buf) {
> +                               buf->v4l2_buf.sequence = cam_dev->sequence;
> +                               buf->v4l2_buf.vb2_buf.timestamp = ktime_get_ns();
> +                               vb2_buffer_done(&buf->v4l2_buf.vb2_buf,
> +                                               VB2_BUF_STATE_DONE);
> +                               list_del(&buf->list);
> +                       }
> +               }
> +
> +               if (list_empty(&cam_dev->buf_list)) {
> +                       (*cam_dev->hw_functions->mtk_cam_update_buffers_add)
> +                                               (cam_dev, &cam_dev->dummy);

It's not necessary to use function pointer. Call
mtk_camsv30_update_buffers_add() directly.

Regards,
Chun-Kuang.

> +                       cam_dev->is_dummy_used = true;
> +               } else {
> +                       buf = list_first_entry_or_null(&cam_dev->buf_list,
> +                                                      struct mtk_cam_dev_buffer,
> +                                                      list);
> +                       (*cam_dev->hw_functions->mtk_cam_update_buffers_add)
> +                                               (cam_dev, buf);
> +                       cam_dev->is_dummy_used = false;
> +               }
> +       }
> +
> +       spin_unlock_irqrestore(&cam_dev->irqlock, flags);
> +
> +       return IRQ_HANDLED;
> +}
> +