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Date:   Thu, 21 Dec 2017 10:38:58 +0800
From:   Yong <yong.deng@...ewell.com>
To:     Chen-Yu Tsai <wens@...e.org>
Cc:     Maxime Ripard <maxime.ripard@...e-electrons.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        "David S. Miller" <davem@...emloft.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Hans Verkuil <hans.verkuil@...co.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        Benoit Parrot <bparrot@...com>,
        Stanimir Varbanov <stanimir.varbanov@...aro.org>,
        Arnd Bergmann <arnd@...db.de>,
        Hugues Fruchet <hugues.fruchet@...com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Benjamin Gaignard <benjamin.gaignard@...aro.org>,
        Ramesh Shanmugasundaram <ramesh.shanmugasundaram@...renesas.com>,
        Yannick Fertre <yannick.fertre@...com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Rick Chang <rick.chang@...iatek.com>,
        Linux Media Mailing List <linux-media@...r.kernel.org>,
        devicetree <devicetree@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-sunxi <linux-sunxi@...glegroups.com>,
        Ondřej Jirman <megous@...ous.com>
Subject: Re: [linux-sunxi] [PATCH v3 1/3] media: V3s: Add support for
 Allwinner CSI.

Hi,

On Tue, 19 Dec 2017 18:35:49 +0800
Chen-Yu Tsai <wens@...e.org> wrote:

> On Mon, Nov 13, 2017 at 3:30 PM, Yong Deng <yong.deng@...ewell.com> wrote:
> > Allwinner V3s SoC have two CSI module. CSI0 is used for MIPI interface
> > and CSI1 is used for parallel interface. This is not documented in
> > datasheet but by testing and guess.
> >
> > This patch implement a v4l2 framework driver for it.
> >
> > Currently, the driver only support the parallel interface. MIPI-CSI2,
> > ISP's support are not included in this patch.
> >
> > Signed-off-by: Yong Deng <yong.deng@...ewell.com>
> > ---
> >  drivers/media/platform/Kconfig                     |   1 +
> >  drivers/media/platform/Makefile                    |   2 +
> >  drivers/media/platform/sunxi/sun6i-csi/Kconfig     |   9 +
> >  drivers/media/platform/sunxi/sun6i-csi/Makefile    |   3 +
> >  drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c | 918 +++++++++++++++++++++
> >  drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.h | 146 ++++
> >  .../media/platform/sunxi/sun6i-csi/sun6i_csi_reg.h | 203 +++++
> >  .../media/platform/sunxi/sun6i-csi/sun6i_video.c   | 722 ++++++++++++++++
> >  .../media/platform/sunxi/sun6i-csi/sun6i_video.h   |  61 ++
> >  9 files changed, 2065 insertions(+)
> >  create mode 100644 drivers/media/platform/sunxi/sun6i-csi/Kconfig
> >  create mode 100644 drivers/media/platform/sunxi/sun6i-csi/Makefile
> >  create mode 100644 drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c
> >  create mode 100644 drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.h
> >  create mode 100644 drivers/media/platform/sunxi/sun6i-csi/sun6i_csi_reg.h
> >  create mode 100644 drivers/media/platform/sunxi/sun6i-csi/sun6i_video.c
> >  create mode 100644 drivers/media/platform/sunxi/sun6i-csi/sun6i_video.h
> >
> 
> [...]
> 
> > diff --git a/drivers/media/platform/sunxi/sun6i-csi/sun6i_video.c b/drivers/media/platform/sunxi/sun6i-csi/sun6i_video.c
> > new file mode 100644
> > index 0000000..0cebcbd
> > --- /dev/null
> > +++ b/drivers/media/platform/sunxi/sun6i-csi/sun6i_video.c
> 
> [...]
> 
> > +/* -----------------------------------------------------------------------------
> > + * Media Operations
> > + */
> > +static int sun6i_video_formats_init(struct sun6i_video *video)
> > +{
> > +       struct v4l2_subdev_mbus_code_enum mbus_code = { 0 };
> > +       struct sun6i_csi *csi = video->csi;
> > +       struct v4l2_format format;
> > +       struct v4l2_subdev *subdev;
> > +       u32 pad;
> > +       const u32 *pixformats;
> > +       int pixformat_count = 0;
> > +       u32 subdev_codes[32]; /* subdev format codes, 32 should be enough */
> > +       int codes_count = 0;
> > +       int num_fmts = 0;
> > +       int i, j;
> > +
> > +       subdev = sun6i_video_remote_subdev(video, &pad);
> > +       if (subdev == NULL)
> > +               return -ENXIO;
> > +
> > +       /* Get supported pixformats of CSI */
> > +       pixformat_count = sun6i_csi_get_supported_pixformats(csi, &pixformats);
> > +       if (pixformat_count <= 0)
> > +               return -ENXIO;
> > +
> > +       /* Get subdev formats codes */
> > +       mbus_code.pad = pad;
> > +       mbus_code.which = V4L2_SUBDEV_FORMAT_ACTIVE;
> > +       while (!v4l2_subdev_call(subdev, pad, enum_mbus_code, NULL,
> > +                                &mbus_code)) {
> > +               if (codes_count >= ARRAY_SIZE(subdev_codes)) {
> > +                       dev_warn(video->csi->dev,
> > +                                "subdev_codes array is full!\n");
> > +                       break;
> > +               }
> > +               subdev_codes[codes_count] = mbus_code.code;
> > +               codes_count++;
> > +               mbus_code.index++;
> > +       }
> > +
> > +       if (!codes_count)
> > +               return -ENXIO;
> > +
> > +       /* Get supported formats count */
> > +       for (i = 0; i < codes_count; i++) {
> > +               for (j = 0; j < pixformat_count; j++) {
> > +                       if (!sun6i_csi_is_format_support(csi, pixformats[j],
> > +                                       mbus_code.code)) {
> 
> Bug here. You are testing against mbus_code.code, which would be whatever
> was leftover from the previous section. Instead you should be testing
> against subdev_codes[i], the list you just built.
> 
> Without it, it won't get past this part of the code if the last enumerated
> media bus format isn't supported.
> 
> > +                               continue;
> > +                       }
> > +                       num_fmts++;
> > +               }
> > +       }
> > +
> > +       if (!num_fmts)
> > +               return -ENXIO;
> > +
> > +       video->num_formats = num_fmts;
> > +       video->formats = devm_kcalloc(video->csi->dev, num_fmts,
> > +                       sizeof(struct sun6i_csi_format), GFP_KERNEL);
> > +       if (!video->formats)
> > +               return -ENOMEM;
> > +
> > +       /* Get supported formats */
> > +       num_fmts = 0;
> > +       for (i = 0; i < codes_count; i++) {
> > +               for (j = 0; j < pixformat_count; j++) {
> > +                       if (!sun6i_csi_is_format_support(csi, pixformats[j],
> > +                                       mbus_code.code)) {
> 
> Same here.
> 
> This gets me past the enumeration part of things...
> 
> > +                               continue;
> > +                       }
> > +
> > +                       video->formats[num_fmts].fourcc = pixformats[j];
> > +                       video->formats[num_fmts].mbus_code =
> > +                                       mbus_code.code;
> > +                       video->formats[num_fmts].bpp =
> > +                                       v4l2_pixformat_get_bpp(pixformats[j]);
> > +                       num_fmts++;
> > +               }
> > +       }
> > +
> > +       /* setup default format */
> > +       format.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
> > +       format.fmt.pix.width = 1280;
> > +       format.fmt.pix.height = 720;
> > +       format.fmt.pix.pixelformat = video->formats[0].fourcc;
> > +       sun6i_video_set_fmt(video, &format);
> 
> But my system crashes here within the OV5640 driver.
> So no tests about the actual functionality. This was on the Bananapi M3,
> which has an A83T SoC.
> 
> 
> In general I think you should make your driver much more noisy than it
> currently is. I spent the whole afternoon adding error messages and
> debug traces to narrow down the issue.

Sorry for making such a simple mistake.

> 
> ChenYu


Thanks,
Yong

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