Hi, Julien:
On Thu, 2024-11-21 at 09:53 +0100, Julien Stephan wrote:
> External email : Please do not click links or open attachments until you have verified the sender or the content.
>
>
> From: Phi-bang Nguyen <pnguyen@xxxxxxxxxxxx>
>
> 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@xxxxxxxxxxxx>
> Signed-off-by: Florian Sylvestre <fsylvestre@xxxxxxxxxxxx>
> [Paul Elder fix irq locking]
> Signed-off-by: Paul Elder <paul.elder@xxxxxxxxxxxxxxxx>
> Co-developed-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
> Signed-off-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
> Co-developed-by: Julien Stephan <jstephan@xxxxxxxxxxxx>
> Signed-off-by: Julien Stephan <jstephan@xxxxxxxxxxxx>
> ---
[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 int irq_status;
> +
> + spin_lock(&cam_dev->buf_list_lock);
spin_lock region should be as small as possible.
Move to where you start to access buf_list.
> +
> + 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%lx\n",
> + irq_status & INT_ST_MASK_CAMSV_ERR);
> +
> + /* De-queue frame */
> + if (irq_status & CAMSV_IRQ_PASS1_DON) {
> + cam_dev->sequence++;
> +
> + 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);
These jobs could be done after buffer is deleted from list, and move these jobs out of this spin_lock region.
vb2_buffer_done() looks like does many things. So it's worth to move vb2_buffer_done() out of this spin_lock region.
spin_lock();
processed_buf = list_first_entry_or_null();
if (processed_buf)
list_del(&processed_buf->list);
spin_unlock();
if (processed_buf) {
...
vb2_buffer_done();
}
Regards,
CK
> + list_del(&buf->list);
> + }
> +
> + buf = list_first_entry_or_null(&cam_dev->buf_list,
> + struct mtk_cam_dev_buffer,
> + list);
> + if (buf)
> + mtk_camsv30_update_buffers_add(cam_dev, buf);
> + }
> +
> + spin_unlock(&cam_dev->buf_list_lock);
> +
> + return IRQ_HANDLED;
> +}
> +
>
