Re: [PATCH v5 04/11] media: bcm2835-unicam: Add support for CCP2/CSI2 camera interface

Laurent Pinchart
2022-02-13T12:52:14Z

On Tue, Feb 08, 2022 at 10:00:23PM +0100, Stefan Wahren wrote:
> Hi Jean-Michel,
>
> Am 08.02.22 um 16:50 schrieb Jean-Michel Hautbois:
> > Add driver for the Unicam camera receiver block on BCM283x processors.
> > It is represented as two video device nodes: unicam-image and
> > unicam-embedded which are connected to an internal subdev (named
> > unicam-subdev) in order to manage streams routing.
> >
> > Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
> > Signed-off-by: Naushir Patuck <naush@raspberrypi.com>
> > Signed-off-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com>
> >
> > ---
> > v4:
> > - Add the vendor prefox for DT name
> > - Use the reg-names in DT parsing
> > - Remove MAINTAINERS entry
> >
> > v3 main changes:
> > - Change code organization
> > - Remove unused variables
> > - Correct the fmt_meta functions
> > - Rewrite the start/stop streaming
> > - You can now start the image node alone, but not the metadata one
> > - The buffers are allocated per-node
> > - only the required stream is started, if the route exists and is
> > enabled
> > - Prefix the macros with UNICAM_ to not have too generic names
> > - Drop colorspace support
> > -> This is causing issues in the try-fmt v4l2-compliance test
> > test VIDIOC_G_FMT: OK
> > fail: v4l2-test-formats.cpp(363): colorspace >= 0xff
> > fail: v4l2-test-formats.cpp(465): testColorspace(!node->is_io_mc, pix.pixelformat, pix.colorspace, pix.ycbcr_enc, pix.quantization)
> > test VIDIOC_TRY_FMT: FAIL
> > fail: v4l2-test-formats.cpp(363): colorspace >= 0xff
> > fail: v4l2-test-formats.cpp(465): testColorspace(!node->is_io_mc, pix.pixelformat, pix.colorspace, pix.ycbcr_enc, pix.quantization)
> > test VIDIOC_S_FMT: FAIL
> >
> > v2: Remove the unicam_{info,debug,error} macros and use
> > dev_dbg/dev_err instead.
> > ---
> > drivers/media/platform/Kconfig | 1 +
> > drivers/media/platform/Makefile | 2 +
> > drivers/media/platform/bcm2835/Kconfig | 21 +
> > drivers/media/platform/bcm2835/Makefile | 3 +
> > .../platform/bcm2835/bcm2835-unicam-regs.h | 253 ++
> > .../media/platform/bcm2835/bcm2835-unicam.c | 2570 +++++++++++++++++
> > 6 files changed, 2850 insertions(+)
> > create mode 100644 drivers/media/platform/bcm2835/Kconfig
> > create mode 100644 drivers/media/platform/bcm2835/Makefile
> > create mode 100644 drivers/media/platform/bcm2835/bcm2835-unicam-regs.h
> > create mode 100644 drivers/media/platform/bcm2835/bcm2835-unicam.c

[snip]

> > diff --git a/drivers/media/platform/bcm2835/bcm2835-unicam.c b/drivers/media/platform/bcm2835/bcm2835-unicam.c
> > new file mode 100644
> > index 000000000000..470e691637c7
> > --- /dev/null
> > +++ b/drivers/media/platform/bcm2835/bcm2835-unicam.c
> > @@ -0,0 +1,2570 @@

[snip]

> > +static int unicam_start_streaming(struct vb2_queue *vq, unsigned int count)
> > +{
> > + struct unicam_node *node = vb2_get_drv_priv(vq);
> > + struct unicam_device *unicam = node->dev;
> > + dma_addr_t buffer_addr[UNICAM_MAX_NODES] = { 0 };
> > + struct unicam_buffer *buf;
> > + struct v4l2_subdev_state *state;
> > + unsigned long flags;
> > + unsigned int i;
> > + int ret;
> > + u32 pad, stream;
> > + u32 remote_pad_index = is_image_node(node) ? UNICAM_SD_PAD_SOURCE_IMAGE
> > + : UNICAM_SD_PAD_SOURCE_METADATA;
> > +
> > + /* Look for the route for the given pad and stream. */
> > + state = v4l2_subdev_lock_active_state(&unicam->subdev.sd);
> > +
> > + ret = v4l2_subdev_routing_find_opposite_end(&state->routing,
> > + remote_pad_index, 0,
> > + &pad, &stream);
> > + if (ret)
> > + goto err_streaming;
> > +
> > + v4l2_subdev_unlock_state(state);
> > +
> > + dev_dbg(unicam->dev, "Starting stream 0 on pad %d on subdev %s\n",
> > + remote_pad_index, unicam->subdev.sd.name);
> > +
> > + /* The metadata node can't be started alone. */
> > + if (is_metadata_node(node)) {
> > + if (!unicam->node[UNICAM_IMAGE_NODE].streaming) {
> > + dev_err(unicam->dev,
> > + "Can't start metadata without image\n");
> > + return -EINVAL;
> > + }
> > + dev_dbg(unicam->dev, "starting metadata node\n");
> > +
> > + spin_lock_irqsave(&node->dma_queue_lock, flags);
> > + buf = list_first_entry(&node->dma_queue,
> > + struct unicam_buffer, list);
> > + dev_dbg(unicam->dev, "buffer %d: %p\n", i, buf);
> > + node->cur_frm = buf;
> > + node->next_frm = buf;
> > + list_del(&buf->list);
> > + spin_unlock_irqrestore(&node->dma_queue_lock, flags);
> > +
> > + buffer_addr[UNICAM_METADATA_NODE] =
> > + vb2_dma_contig_plane_dma_addr(&buf->vb.vb2_buf, 0);
> > + dev_dbg(unicam->dev, "buffer %d addr: %lld\n", i, buffer_addr[i]);
>
> i tried to compile the driver and get the following warning. I think the
> easiest solution would be to drop this debug message.

For the record, the right format specifier would be

dev_dbg(unicam->dev, "buffer %d addr: %pad\n", i, &buffer_addr[i]);

(note the & before buffer_addr)

> In file included from ./include/linux/printk.h:555:0,
>
>                  from ./include/linux/kernel.h:29,
>                  from ./include/linux/clk.h:13,
>                  from drivers/media/platform/bcm2835/bcm2835-unicam.c:47:
> drivers/media/platform/bcm2835/bcm2835-unicam.c: In function
> ‘unicam_start_streaming’:
> drivers/media/platform/bcm2835/bcm2835-unicam.c:1676:24: warning: format
> ‘%lld’ expects argument of type ‘long long int’, but argument 5 has type
> ‘dma_addr_t {aka unsigned int}’ [-Wformat=]
>    dev_dbg(unicam->dev, "buffer %d addr: %lld\n", i, buffer_addr[i]);
>                         ^
> ./include/linux/dynamic_debug.h:134:15: note: in definition of macro
> ‘__dynamic_func_call’
>    func(&id, ##__VA_ARGS__);  \
>                ^~~~~~~~~~~
> ./include/linux/dynamic_debug.h:166:2: note: in expansion of macro
> ‘_dynamic_func_call’
>   _dynamic_func_call(fmt,__dynamic_dev_dbg,   \
>   ^~~~~~~~~~~~~~~~~~
> ./include/linux/dev_printk.h:155:2: note: in expansion of macro
> ‘dynamic_dev_dbg’
>   dynamic_dev_dbg(dev, dev_fmt(fmt), ##__VA_ARGS__)
>   ^~~~~~~~~~~~~~~
> ./include/linux/dev_printk.h:155:23: note: in expansion of macro ‘dev_fmt’
>   dynamic_dev_dbg(dev, dev_fmt(fmt), ##__VA_ARGS__)
>                        ^~~~~~~
> drivers/media/platform/bcm2835/bcm2835-unicam.c:1676:3: note: in
> expansion of macro ‘dev_dbg’
>    dev_dbg(unicam->dev, "buffer %d addr: %lld\n", i, buffer_addr[i]);
>    ^~~~~~~

--
Regards,

Laurent Pinchart