[media] v4l: Support extending the v4l2_pix_format structure

The v4l2_pix_format structure has no reserved field. It is embedded in
the v4l2_framebuffer structure which has no reserved fields either, and
in the v4l2_format structure which has reserved fields that were not
previously required to be zeroed out by applications.

To allow extending v4l2_pix_format, inline it in the v4l2_framebuffer
structure, and use the priv field as a magic value to indicate that the
application has set all v4l2_pix_format extended fields and zeroed all
reserved fields following the v4l2_pix_format field in the v4l2_format
structure.

The availability of this API extension is reported to userspace through
the new V4L2_CAP_EXT_PIX_FORMAT capability flag. Just checking that the
priv field is still set to the magic value at [GS]_FMT return wouldn't
be enough, as older kernels don't zero the priv field on return.

To simplify the internal API towards drivers zero the extended fields
and set the priv field to the magic value for applications not aware of
the extensions.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

31 files changed, 134 insertions, 70 deletions

diff --git a/Documentation/DocBook/media/Makefile b/Documentation/DocBook/media/Makefile
index 639e74857968..df2962d9e11e 100644
--- a/Documentation/DocBook/media/Makefile
+++ b/Documentation/DocBook/media/Makefile
@@ -174,7 +174,7 @@ FILENAME = \
 DOCUMENTED = \
         -e "s/\(enum *\)v4l2_mpeg_cx2341x_video_\([a-z]*_spatial_filter_type\)/\1<link linkend=\"\2\">v4l2_mpeg_cx2341x_video_\2<\/link>/g" \
         -e "s/\(\(enum\|struct\) *\)\(v4l2_[a-zA-Z0-9_]*\)/\1<link linkend=\"\3\">\3<\/link>/g" \
-        -e "s/\(V4L2_PIX_FMT_[A-Z0-9_]\+\) /<link linkend=\"\1\">\1<\/link> /g" \
+        -e "s/\(V4L2_PIX_FMT_[A-Z0-9_]\+\)\(\s\+v4l2_fourcc\)/<link linkend=\"\1\">\1<\/link>\2/g" \
         -e ":a;s/\(linkend=\".*\)_\(.*\">\)/\1-\2/;ta" \
         -e "s/v4l2\-mpeg\-vbi\-ITV0/v4l2-mpeg-vbi-itv0-1/g"
 
diff --git a/Documentation/DocBook/media/v4l/pixfmt.xml b/Documentation/DocBook/media/v4l/pixfmt.xml
index 91dcbc84f3f8..bb36b3829cf9 100644
--- a/Documentation/DocBook/media/v4l/pixfmt.xml
+++ b/Documentation/DocBook/media/v4l/pixfmt.xml
@@ -112,9 +112,28 @@ see <xref linkend="colorspaces" />.</entry>
         <row>
           <entry>__u32</entry>
           <entry><structfield>priv</structfield></entry>
-          <entry>Reserved for custom (driver defined) additional
-information about formats. When not used drivers and applications must
-set this field to zero.</entry>
+          <entry><para>This field indicates whether the remaining fields of the
+<structname>v4l2_pix_format</structname> structure, also called the extended
+fields, are valid. When set to <constant>V4L2_PIX_FMT_PRIV_MAGIC</constant>, it
+indicates that the extended fields have been correctly initialized. When set to
+any other value it indicates that the extended fields contain undefined values.
+</para>
+<para>Applications that wish to use the pixel format extended fields must first
+ensure that the feature is supported by querying the device for the
+<link linkend="querycap"><constant>V4L2_CAP_EXT_PIX_FORMAT</constant></link>
+capability. If the capability isn't set the pixel format extended fields are not
+supported and using the extended fields will lead to undefined results.</para>
+<para>To use the extended fields, applications must set the
+<structfield>priv</structfield> field to
+<constant>V4L2_PIX_FMT_PRIV_MAGIC</constant>, initialize all the extended fields
+and zero the unused bytes of the <structname>v4l2_format</structname>
+<structfield>raw_data</structfield> field.</para>
+<para>When the <structfield>priv</structfield> field isn't set to
+<constant>V4L2_PIX_FMT_PRIV_MAGIC</constant> drivers must act as if all the
+extended fields were set to zero. On return drivers must set the
+<structfield>priv</structfield> field to
+<constant>V4L2_PIX_FMT_PRIV_MAGIC</constant> and all the extended fields to
+applicable values.</para></entry>
         </row>
       </tbody>
     </tgroup>
diff --git a/Documentation/DocBook/media/v4l/v4l2.xml b/Documentation/DocBook/media/v4l/v4l2.xml
index b445161b912c..d0a48bebfa52 100644
--- a/Documentation/DocBook/media/v4l/v4l2.xml
+++ b/Documentation/DocBook/media/v4l/v4l2.xml
@@ -152,6 +152,14 @@ structs, ioctls) must be noted in more detail in the history chapter
 applications. -->
 
       <revision>
+        <revnumber>3.16</revnumber>
+        <date>2014-05-27</date>
+        <authorinitials>lp</authorinitials>
+        <revremark>Extended &v4l2-pix-format;.
+        </revremark>
+      </revision>
+
+      <revision>
         <revnumber>3.15</revnumber>
         <date>2014-02-03</date>
         <authorinitials>hv, ap</authorinitials>
diff --git a/Documentation/DocBook/media/v4l/vidioc-g-fbuf.xml b/Documentation/DocBook/media/v4l/vidioc-g-fbuf.xml
index 7c63815e7afd..20460730b02c 100644
--- a/Documentation/DocBook/media/v4l/vidioc-g-fbuf.xml
+++ b/Documentation/DocBook/media/v4l/vidioc-g-fbuf.xml
@@ -152,13 +152,10 @@ a valid base address, so applications can find the corresponding Linux
 framebuffer device (see <xref linkend="osd" />).</entry>
           </row>
           <row>
-            <entry>&v4l2-pix-format;</entry>
+            <entry>struct</entry>
             <entry><structfield>fmt</structfield></entry>
             <entry></entry>
-            <entry>Layout of the frame buffer. The
-<structname>v4l2_pix_format</structname> structure is defined in <xref
-linkend="pixfmt" />, for clarification the fields and acceptable values
-            are listed below:</entry>
+            <entry>Layout of the frame buffer.</entry>
           </row>
           <row>
             <entry></entry>
@@ -276,9 +273,8 @@ see <xref linkend="colorspaces" />.</entry>
             <entry></entry>
             <entry>__u32</entry>
             <entry><structfield>priv</structfield></entry>
-            <entry>Reserved for additional information about custom
-(driver defined) formats. When not used drivers and applications must
-set this field to zero.</entry>
+            <entry>Reserved. Drivers and applications must set this field to
+zero.</entry>
           </row>
         </tbody>
       </tgroup>
diff --git a/Documentation/DocBook/media/v4l/vidioc-querycap.xml b/Documentation/DocBook/media/v4l/vidioc-querycap.xml
index 370d49d6fb64..d0c5e604f014 100644
--- a/Documentation/DocBook/media/v4l/vidioc-querycap.xml
+++ b/Documentation/DocBook/media/v4l/vidioc-querycap.xml
@@ -302,6 +302,12 @@ modulator programming see
 <link linkend="sdr">SDR Capture</link> interface.</entry>
           </row>
           <row>
+            <entry><constant>V4L2_CAP_EXT_PIX_FORMAT</constant></entry>
+            <entry>0x00200000</entry>
+            <entry>The device supports the &v4l2-pix-format; extended
+fields.</entry>
+          </row>
+          <row>
             <entry><constant>V4L2_CAP_READWRITE</constant></entry>
             <entry>0x01000000</entry>
             <entry>The device supports the <link
diff --git a/drivers/media/parport/bw-qcam.c b/drivers/media/parport/bw-qcam.c
index 3c5dac4c1eab..67b9da1dc43f 100644
--- a/drivers/media/parport/bw-qcam.c
+++ b/drivers/media/parport/bw-qcam.c
@@ -759,7 +759,6 @@ static int qcam_g_fmt_vid_cap(struct file *file, void *fh, struct v4l2_format *f
         pix->sizeimage = pix->width * pix->height;
         /* Just a guess */
         pix->colorspace = V4L2_COLORSPACE_SRGB;
-        pix->priv = 0;
         return 0;
 }
 
@@ -785,7 +784,6 @@ static int qcam_try_fmt_vid_cap(struct file *file, void *fh, struct v4l2_format
         pix->sizeimage = pix->width * pix->height;
         /* Just a guess */
         pix->colorspace = V4L2_COLORSPACE_SRGB;
-        pix->priv = 0;
         return 0;
 }
 
diff --git a/drivers/media/pci/cx18/cx18-ioctl.c b/drivers/media/pci/cx18/cx18-ioctl.c
index fefb2cd35838..6f2b59042b73 100644
--- a/drivers/media/pci/cx18/cx18-ioctl.c
+++ b/drivers/media/pci/cx18/cx18-ioctl.c
@@ -156,7 +156,6 @@ static int cx18_g_fmt_vid_cap(struct file *file, void *fh,
         pixfmt->height = cx->cxhdl.height;
         pixfmt->colorspace = V4L2_COLORSPACE_SMPTE170M;
         pixfmt->field = V4L2_FIELD_INTERLACED;
-        pixfmt->priv = 0;
         if (id->type == CX18_ENC_STREAM_TYPE_YUV) {
                 pixfmt->pixelformat = s->pixelformat;
                 pixfmt->sizeimage = s->vb_bytes_per_frame;
diff --git a/drivers/media/pci/cx25821/cx25821-video.c b/drivers/media/pci/cx25821/cx25821-video.c
index 8d2f1abeef77..3a419f134584 100644
--- a/drivers/media/pci/cx25821/cx25821-video.c
+++ b/drivers/media/pci/cx25821/cx25821-video.c
@@ -576,7 +576,6 @@ static int cx25821_vidioc_g_fmt_vid_cap(struct file *file, void *priv,
         f->fmt.pix.bytesperline = (chan->width * chan->fmt->depth) >> 3;
         f->fmt.pix.sizeimage = chan->height * f->fmt.pix.bytesperline;
         f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
-        f->fmt.pix.priv = 0;
 
         return 0;
 }
@@ -615,7 +614,6 @@ static int cx25821_vidioc_try_fmt_vid_cap(struct file *file, void *priv,
         f->fmt.pix.bytesperline = (f->fmt.pix.width * fmt->depth) >> 3;
         f->fmt.pix.sizeimage = f->fmt.pix.height * f->fmt.pix.bytesperline;
         f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
-        f->fmt.pix.priv = 0;
 
         return 0;
 }
@@ -867,7 +865,6 @@ static int cx25821_vidioc_try_fmt_vid_out(struct file *file, void *priv,
         f->fmt.pix.bytesperline = (f->fmt.pix.width * fmt->depth) >> 3;
         f->fmt.pix.sizeimage = f->fmt.pix.height * f->fmt.pix.bytesperline;
         f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
-        f->fmt.pix.priv = 0;
         return 0;
 }
 
diff --git a/drivers/media/pci/ivtv/ivtv-ioctl.c b/drivers/media/pci/ivtv/ivtv-ioctl.c
index b3667a00db3a..3e0cb77d5930 100644
--- a/drivers/media/pci/ivtv/ivtv-ioctl.c
+++ b/drivers/media/pci/ivtv/ivtv-ioctl.c
@@ -351,7 +351,6 @@ static int ivtv_g_fmt_vid_cap(struct file *file, void *fh, struct v4l2_format *f
         pixfmt->height = itv->cxhdl.height;
         pixfmt->colorspace = V4L2_COLORSPACE_SMPTE170M;
         pixfmt->field = V4L2_FIELD_INTERLACED;
-        pixfmt->priv = 0;
         if (id->type == IVTV_ENC_STREAM_TYPE_YUV) {
                 pixfmt->pixelformat = V4L2_PIX_FMT_HM12;
                 /* YUV size is (Y=(h*720) + UV=(h*(720/2))) */
@@ -418,7 +417,6 @@ static int ivtv_g_fmt_vid_out(struct file *file, void *fh, struct v4l2_format *f
         pixfmt->height = itv->main_rect.height;
         pixfmt->colorspace = V4L2_COLORSPACE_SMPTE170M;
         pixfmt->field = V4L2_FIELD_INTERLACED;
-        pixfmt->priv = 0;
         if (id->type == IVTV_DEC_STREAM_TYPE_YUV) {
                 switch (itv->yuv_info.lace_mode & IVTV_YUV_MODE_MASK) {
                 case IVTV_YUV_MODE_INTERLACED:
@@ -1384,7 +1382,6 @@ static int ivtv_g_fbuf(struct file *file, void *fh, struct v4l2_framebuffer *fb)
         fb->fmt.bytesperline = fb->fmt.width;
         fb->fmt.colorspace = V4L2_COLORSPACE_SMPTE170M;
         fb->fmt.field = V4L2_FIELD_INTERLACED;
-        fb->fmt.priv = 0;
         if (fb->fmt.pixelformat != V4L2_PIX_FMT_PAL8)
                 fb->fmt.bytesperline *= 2;
         if (fb->fmt.pixelformat == V4L2_PIX_FMT_RGB32 ||
diff --git a/drivers/media/pci/meye/meye.c b/drivers/media/pci/meye/meye.c
index 1a77f8dfafa5..aeae54708811 100644
--- a/drivers/media/pci/meye/meye.c
+++ b/drivers/media/pci/meye/meye.c
@@ -1166,7 +1166,6 @@ static int vidioc_try_fmt_vid_cap(struct file *file, void *fh,
         f->fmt.pix.sizeimage = f->fmt.pix.height *
                                f->fmt.pix.bytesperline;
         f->fmt.pix.colorspace = 0;
-        f->fmt.pix.priv = 0;
 
         return 0;
 }
@@ -1232,7 +1231,6 @@ static int vidioc_s_fmt_vid_cap(struct file *file, void *fh,
         f->fmt.pix.sizeimage = f->fmt.pix.height *
                                f->fmt.pix.bytesperline;
         f->fmt.pix.colorspace = 0;
-        f->fmt.pix.priv = 0;
 
         return 0;
 }
diff --git a/drivers/media/pci/saa7134/saa7134-empress.c b/drivers/media/pci/saa7134/saa7134-empress.c
index 5526ed5444fb..ef39261c1f20 100644
--- a/drivers/media/pci/saa7134/saa7134-empress.c
+++ b/drivers/media/pci/saa7134/saa7134-empress.c
@@ -130,7 +130,6 @@ static int empress_g_fmt_vid_cap(struct file *file, void *priv,
         f->fmt.pix.pixelformat  = V4L2_PIX_FMT_MPEG;
         f->fmt.pix.sizeimage    = TS_PACKET_SIZE * dev->ts.nr_packets;
         f->fmt.pix.bytesperline = 0;
-        f->fmt.pix.priv = 0;
 
         return 0;
 }
@@ -148,7 +147,6 @@ static int empress_s_fmt_vid_cap(struct file *file, void *priv,
         f->fmt.pix.pixelformat  = V4L2_PIX_FMT_MPEG;
         f->fmt.pix.sizeimage    = TS_PACKET_SIZE * dev->ts.nr_packets;
         f->fmt.pix.bytesperline = 0;
-        f->fmt.pix.priv = 0;
 
         return 0;
 }
@@ -166,7 +164,6 @@ static int empress_try_fmt_vid_cap(struct file *file, void *priv,
         f->fmt.pix.pixelformat  = V4L2_PIX_FMT_MPEG;
         f->fmt.pix.sizeimage    = TS_PACKET_SIZE * dev->ts.nr_packets;
         f->fmt.pix.bytesperline = 0;
-        f->fmt.pix.priv = 0;
 
         return 0;
 }
diff --git a/drivers/media/pci/saa7134/saa7134-video.c b/drivers/media/pci/saa7134/saa7134-video.c
index d37599980768..0cfa2ca6a32a 100644
--- a/drivers/media/pci/saa7134/saa7134-video.c
+++ b/drivers/media/pci/saa7134/saa7134-video.c
@@ -1235,7 +1235,6 @@ static int saa7134_g_fmt_vid_cap(struct file *file, void *priv,
         f->fmt.pix.sizeimage =
                 f->fmt.pix.height * f->fmt.pix.bytesperline;
         f->fmt.pix.colorspace   = V4L2_COLORSPACE_SMPTE170M;
-        f->fmt.pix.priv = 0;
         return 0;
 }
 
@@ -1315,7 +1314,6 @@ static int saa7134_try_fmt_vid_cap(struct file *file, void *priv,
         f->fmt.pix.sizeimage =
                 f->fmt.pix.height * f->fmt.pix.bytesperline;
         f->fmt.pix.colorspace   = V4L2_COLORSPACE_SMPTE170M;
-        f->fmt.pix.priv = 0;
 
         return 0;
 }
diff --git a/drivers/media/pci/sta2x11/sta2x11_vip.c b/drivers/media/pci/sta2x11/sta2x11_vip.c
index f2d8c70d35f5..365bd21301ba 100644
--- a/drivers/media/pci/sta2x11/sta2x11_vip.c
+++ b/drivers/media/pci/sta2x11/sta2x11_vip.c
@@ -640,7 +640,6 @@ static int vidioc_try_fmt_vid_cap(struct file *file, void *priv,
         f->fmt.pix.bytesperline = f->fmt.pix.width * 2;
         f->fmt.pix.sizeimage = f->fmt.pix.width * 2 * f->fmt.pix.height;
         f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
-        f->fmt.pix.priv = 0;
         return 0;
 }
 
diff --git a/drivers/media/platform/coda.c b/drivers/media/platform/coda.c
index b1783791d426..54886606ed68 100644
--- a/drivers/media/platform/coda.c
+++ b/drivers/media/platform/coda.c
@@ -613,8 +613,6 @@ static int coda_try_fmt(struct coda_ctx *ctx, struct coda_codec *codec,
                 BUG();
         }
 
-        f->fmt.pix.priv = 0;
-
         return 0;
 }
 
diff --git a/drivers/media/platform/davinci/vpif_display.c b/drivers/media/platform/davinci/vpif_display.c
index 877b46e8b2e4..0bd6dcb13cbc 100644
--- a/drivers/media/platform/davinci/vpif_display.c
+++ b/drivers/media/platform/davinci/vpif_display.c
@@ -648,7 +648,6 @@ static int vpif_try_fmt_vid_out(struct file *file, void *priv,
         pixfmt->width = common->fmt.fmt.pix.width;
         pixfmt->height = common->fmt.fmt.pix.height;
         pixfmt->sizeimage = pixfmt->bytesperline * pixfmt->height * 2;
-        pixfmt->priv = 0;
 
         return 0;
 }
diff --git a/drivers/media/platform/mem2mem_testdev.c b/drivers/media/platform/mem2mem_testdev.c
index 0714070ed7fa..c1b03cfd6ded 100644
--- a/drivers/media/platform/mem2mem_testdev.c
+++ b/drivers/media/platform/mem2mem_testdev.c
@@ -532,7 +532,6 @@ static int vidioc_try_fmt(struct v4l2_format *f, struct m2mtest_fmt *fmt)
         f->fmt.pix.bytesperline = (f->fmt.pix.width * fmt->depth) >> 3;
         f->fmt.pix.sizeimage = f->fmt.pix.height * f->fmt.pix.bytesperline;
         f->fmt.pix.field = V4L2_FIELD_NONE;
-        f->fmt.pix.priv = 0;
 
         return 0;
 }
diff --git a/drivers/media/platform/omap/omap_vout.c b/drivers/media/platform/omap/omap_vout.c
index 9a726eacb29b..2d177fa58471 100644
--- a/drivers/media/platform/omap/omap_vout.c
+++ b/drivers/media/platform/omap/omap_vout.c
@@ -165,7 +165,6 @@ static int omap_vout_try_format(struct v4l2_pix_format *pix)
 
         pix->pixelformat = omap_formats[ifmt].pixelformat;
         pix->field = V4L2_FIELD_ANY;
-        pix->priv = 0;
 
         switch (pix->pixelformat) {
         case V4L2_PIX_FMT_YUYV:
@@ -1896,7 +1895,6 @@ static int __init omap_vout_setup_video_data(struct omap_vout_device *vout)
         pix->field = V4L2_FIELD_ANY;
         pix->bytesperline = pix->width * 2;
         pix->sizeimage = pix->bytesperline * pix->height;
-        pix->priv = 0;
         pix->colorspace = V4L2_COLORSPACE_JPEG;
 
         vout->bpp = RGB565_BPP;
diff --git a/drivers/media/platform/sh_veu.c b/drivers/media/platform/sh_veu.c
index 744e43b480bc..8dc279d4d561 100644
--- a/drivers/media/platform/sh_veu.c
+++ b/drivers/media/platform/sh_veu.c
@@ -425,7 +425,6 @@ static int sh_veu_g_fmt(struct sh_veu_file *veu_file, struct v4l2_format *f)
         pix->bytesperline       = vfmt->bytesperline;
         pix->sizeimage          = vfmt->bytesperline * pix->height *
                 vfmt->fmt->depth / vfmt->fmt->ydepth;
-        pix->priv               = 0;
         dev_dbg(veu->dev, "%s(): type: %d, size %u @ %ux%u, fmt %x\n", __func__,
                 f->type, pix->sizeimage, pix->width, pix->height, pix->pixelformat);
 
@@ -473,7 +472,6 @@ static int sh_veu_try_fmt(struct v4l2_format *f, const struct sh_veu_format *fmt
 
         pix->pixelformat        = fmt->fourcc;
         pix->colorspace         = sh_veu_4cc2cspace(pix->pixelformat);
-        pix->priv               = 0;
 
         pr_debug("%s(): type: %d, size %u\n", __func__, f->type, pix->sizeimage);
 
diff --git a/drivers/media/platform/vino.c b/drivers/media/platform/vino.c
index 470d35336119..91d44ea16f27 100644
--- a/drivers/media/platform/vino.c
+++ b/drivers/media/platform/vino.c
@@ -3147,7 +3147,6 @@ static int vino_try_fmt_vid_cap(struct file *file, void *__fh,
         pf->colorspace =
                 vino_data_formats[tempvcs.data_format].colorspace;
 
-        pf->priv = 0;
         return 0;
 }
 
@@ -3175,8 +3174,6 @@ static int vino_g_fmt_vid_cap(struct file *file, void *__fh,
         pf->colorspace =
                 vino_data_formats[vcs->data_format].colorspace;
 
-        pf->priv = 0;
-
         spin_unlock_irqrestore(&vino_drvdata->input_lock, flags);
         return 0;
 }
@@ -3219,8 +3216,6 @@ static int vino_s_fmt_vid_cap(struct file *file, void *__fh,
         pf->colorspace =
                 vino_data_formats[vcs->data_format].colorspace;
 
-        pf->priv = 0;
-
         spin_unlock_irqrestore(&vino_drvdata->input_lock, flags);
         return 0;
 }
diff --git a/drivers/media/platform/vivi.c b/drivers/media/platform/vivi.c
index 7542b5dd9910..80333714ffa7 100644
--- a/drivers/media/platform/vivi.c
+++ b/drivers/media/platform/vivi.c
@@ -1014,7 +1014,6 @@ static int vidioc_try_fmt_vid_cap(struct file *file, void *priv,
                 f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
         else
                 f->fmt.pix.colorspace = V4L2_COLORSPACE_SRGB;
-        f->fmt.pix.priv = 0;
         return 0;
 }
 
diff --git a/drivers/media/usb/cx231xx/cx231xx-417.c b/drivers/media/usb/cx231xx/cx231xx-417.c
index f0400e260eb7..459bb0e98971 100644
--- a/drivers/media/usb/cx231xx/cx231xx-417.c
+++ b/drivers/media/usb/cx231xx/cx231xx-417.c
@@ -1563,7 +1563,6 @@ static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
         f->fmt.pix.width = dev->ts1.width;
         f->fmt.pix.height = dev->ts1.height;
         f->fmt.pix.field = V4L2_FIELD_INTERLACED;
-        f->fmt.pix.priv = 0;
         dprintk(1, "VIDIOC_G_FMT: w: %d, h: %d\n",
                 dev->ts1.width, dev->ts1.height);
         dprintk(3, "exit vidioc_g_fmt_vid_cap()\n");
@@ -1582,7 +1581,6 @@ static int vidioc_try_fmt_vid_cap(struct file *file, void *priv,
         f->fmt.pix.sizeimage = mpeglines * mpeglinesize;
         f->fmt.pix.field = V4L2_FIELD_INTERLACED;
         f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
-        f->fmt.pix.priv = 0;
         dprintk(1, "VIDIOC_TRY_FMT: w: %d, h: %d\n",
                 dev->ts1.width, dev->ts1.height);
         dprintk(3, "exit vidioc_try_fmt_vid_cap()\n");
diff --git a/drivers/media/usb/cx231xx/cx231xx-video.c b/drivers/media/usb/cx231xx/cx231xx-video.c
index ae31ca2fc9a1..3b3ada6562ca 100644
--- a/drivers/media/usb/cx231xx/cx231xx-video.c
+++ b/drivers/media/usb/cx231xx/cx231xx-video.c
@@ -885,7 +885,6 @@ static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
         f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
 
         f->fmt.pix.field = V4L2_FIELD_INTERLACED;
-        f->fmt.pix.priv = 0;
 
         return 0;
 }
@@ -930,7 +929,6 @@ static int vidioc_try_fmt_vid_cap(struct file *file, void *priv,
         f->fmt.pix.sizeimage = f->fmt.pix.bytesperline * height;
         f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
         f->fmt.pix.field = V4L2_FIELD_INTERLACED;
-        f->fmt.pix.priv = 0;
 
         return 0;
 }
diff --git a/drivers/media/usb/gspca/gspca.c b/drivers/media/usb/gspca/gspca.c
index 42d223239206..e8cf23c91cef 100644
--- a/drivers/media/usb/gspca/gspca.c
+++ b/drivers/media/usb/gspca/gspca.c
@@ -1109,8 +1109,8 @@ static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
         struct gspca_dev *gspca_dev = video_drvdata(file);
 
         fmt->fmt.pix = gspca_dev->pixfmt;
-        /* some drivers use priv internally, zero it before giving it to
-           userspace */
+        /* some drivers use priv internally, zero it before giving it back to
+           the core */
         fmt->fmt.pix.priv = 0;
         return 0;
 }
@@ -1146,8 +1146,8 @@ static int try_fmt_vid_cap(struct gspca_dev *gspca_dev,
                 fmt->fmt.pix.height = h;
                 gspca_dev->sd_desc->try_fmt(gspca_dev, fmt);
         }
-        /* some drivers use priv internally, zero it before giving it to
-           userspace */
+        /* some drivers use priv internally, zero it before giving it back to
+           the core */
         fmt->fmt.pix.priv = 0;
         return mode;                    /* used when s_fmt */
 }
diff --git a/drivers/media/usb/hdpvr/hdpvr-video.c b/drivers/media/usb/hdpvr/hdpvr-video.c
index dca4b65053aa..4b7653fd4b0b 100644
--- a/drivers/media/usb/hdpvr/hdpvr-video.c
+++ b/drivers/media/usb/hdpvr/hdpvr-video.c
@@ -1022,7 +1022,6 @@ static int vidioc_g_fmt_vid_cap(struct file *file, void *_fh,
         f->fmt.pix.pixelformat  = V4L2_PIX_FMT_MPEG;
         f->fmt.pix.sizeimage    = dev->bulk_in_size;
         f->fmt.pix.bytesperline = 0;
-        f->fmt.pix.priv         = 0;
         if (f->fmt.pix.width == 720) {
                 /* SDTV formats */
                 f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
diff --git a/drivers/media/usb/stkwebcam/stk-webcam.c b/drivers/media/usb/stkwebcam/stk-webcam.c
index d76860b6a0b8..3588dc38db87 100644
--- a/drivers/media/usb/stkwebcam/stk-webcam.c
+++ b/drivers/media/usb/stkwebcam/stk-webcam.c
@@ -923,7 +923,6 @@ static int stk_vidioc_g_fmt_vid_cap(struct file *filp,
                 pix_format->bytesperline = 2 * pix_format->width;
         pix_format->sizeimage = pix_format->bytesperline
                                 * pix_format->height;
-        pix_format->priv = 0;
         return 0;
 }
 
@@ -967,7 +966,6 @@ static int stk_try_fmt_vid_cap(struct file *filp,
                 fmtd->fmt.pix.bytesperline = 2 * fmtd->fmt.pix.width;
         fmtd->fmt.pix.sizeimage = fmtd->fmt.pix.bytesperline
                 * fmtd->fmt.pix.height;
-        fmtd->fmt.pix.priv = 0;
         return 0;
 }
 
diff --git a/drivers/media/usb/tlg2300/pd-video.c b/drivers/media/usb/tlg2300/pd-video.c
index 8df668d06552..8cd7f02fcf9f 100644
--- a/drivers/media/usb/tlg2300/pd-video.c
+++ b/drivers/media/usb/tlg2300/pd-video.c
@@ -1321,7 +1321,6 @@ static void init_video_context(struct running_context *context)
                                 .bytesperline   = 720 * 2,
                                 .sizeimage      = 720 * 576 * 2,
                                 .colorspace     = V4L2_COLORSPACE_SMPTE170M,
-                                .priv           = 0
                         };
 }
 
diff --git a/drivers/media/usb/tm6000/tm6000-video.c b/drivers/media/usb/tm6000/tm6000-video.c
index 9bde0642ffd1..793577fc4633 100644
--- a/drivers/media/usb/tm6000/tm6000-video.c
+++ b/drivers/media/usb/tm6000/tm6000-video.c
@@ -918,7 +918,6 @@ static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
                 (f->fmt.pix.width * fh->fmt->depth) >> 3;
         f->fmt.pix.sizeimage =
                 f->fmt.pix.height * f->fmt.pix.bytesperline;
-        f->fmt.pix.priv = 0;
 
         return 0;
 }
@@ -959,7 +958,6 @@ static int vidioc_try_fmt_vid_cap(struct file *file, void *priv,
         f->fmt.pix.width &= ~0x01;
 
         f->fmt.pix.field = field;
-        f->fmt.pix.priv = 0;
 
         f->fmt.pix.bytesperline =
                 (f->fmt.pix.width * fmt->depth) >> 3;
diff --git a/drivers/media/usb/zr364xx/zr364xx.c b/drivers/media/usb/zr364xx/zr364xx.c
index 3b80579a82c5..5c006277b8b1 100644
--- a/drivers/media/usb/zr364xx/zr364xx.c
+++ b/drivers/media/usb/zr364xx/zr364xx.c
@@ -806,7 +806,6 @@ static int zr364xx_vidioc_try_fmt_vid_cap(struct file *file, void *priv,
         f->fmt.pix.bytesperline = f->fmt.pix.width * 2;
         f->fmt.pix.sizeimage = f->fmt.pix.height * f->fmt.pix.bytesperline;
         f->fmt.pix.colorspace = V4L2_COLORSPACE_JPEG;
-        f->fmt.pix.priv = 0;
         DBG("%s: V4L2_PIX_FMT_%s (%d) ok!\n", __func__,
             decode_fourcc(f->fmt.pix.pixelformat, pixelformat_name),
             f->fmt.pix.field);
@@ -829,7 +828,6 @@ static int zr364xx_vidioc_g_fmt_vid_cap(struct file *file, void *priv,
         f->fmt.pix.bytesperline = f->fmt.pix.width * 2;
         f->fmt.pix.sizeimage = f->fmt.pix.height * f->fmt.pix.bytesperline;
         f->fmt.pix.colorspace = V4L2_COLORSPACE_JPEG;
-        f->fmt.pix.priv = 0;
         return 0;
 }
 
@@ -866,7 +864,6 @@ static int zr364xx_vidioc_s_fmt_vid_cap(struct file *file, void *priv,
         f->fmt.pix.bytesperline = f->fmt.pix.width * 2;
         f->fmt.pix.sizeimage = f->fmt.pix.height * f->fmt.pix.bytesperline;
         f->fmt.pix.colorspace = V4L2_COLORSPACE_JPEG;
-        f->fmt.pix.priv = 0;
         cam->vb_vidq.field = f->fmt.pix.field;
 
         if (f->fmt.pix.width == 160 && f->fmt.pix.height == 120)
diff --git a/drivers/media/v4l2-core/v4l2-compat-ioctl32.c b/drivers/media/v4l2-core/v4l2-compat-ioctl32.c
index 7e2411c36419..cca6c2f76b3a 100644
--- a/drivers/media/v4l2-core/v4l2-compat-ioctl32.c
+++ b/drivers/media/v4l2-core/v4l2-compat-ioctl32.c
@@ -540,7 +540,16 @@ struct v4l2_framebuffer32 {
         __u32                   capability;
         __u32                   flags;
         compat_caddr_t          base;
-        struct v4l2_pix_format  fmt;
+        struct {
+                __u32           width;
+                __u32           height;
+                __u32           pixelformat;
+                __u32           field;
+                __u32           bytesperline;
+                __u32           sizeimage;
+                __u32           colorspace;
+                __u32           priv;
+        } fmt;
 };
 
 static int get_v4l2_framebuffer32(struct v4l2_framebuffer *kp, struct v4l2_framebuffer32 __user *up)
@@ -550,10 +559,10 @@ static int get_v4l2_framebuffer32(struct v4l2_framebuffer *kp, struct v4l2_frame
         if (!access_ok(VERIFY_READ, up, sizeof(struct v4l2_framebuffer32)) ||
                 get_user(tmp, &up->base) ||
                 get_user(kp->capability, &up->capability) ||
-                get_user(kp->flags, &up->flags))
+                get_user(kp->flags, &up->flags) ||
+                copy_from_user(&kp->fmt, &up->fmt, sizeof(up->fmt)))
                         return -EFAULT;
         kp->base = compat_ptr(tmp);
-        get_v4l2_pix_format(&kp->fmt, &up->fmt);
         return 0;
 }
 
@@ -564,9 +573,9 @@ static int put_v4l2_framebuffer32(struct v4l2_framebuffer *kp, struct v4l2_frame
         if (!access_ok(VERIFY_WRITE, up, sizeof(struct v4l2_framebuffer32)) ||
                 put_user(tmp, &up->base) ||
                 put_user(kp->capability, &up->capability) ||
-                put_user(kp->flags, &up->flags))
+                put_user(kp->flags, &up->flags) ||
+                copy_to_user(&up->fmt, &kp->fmt, sizeof(up->fmt)))
                         return -EFAULT;
-        put_v4l2_pix_format(&kp->fmt, &up->fmt);
         return 0;
 }
 
diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c
index 96bc117f66b2..2e630005676f 100644
--- a/drivers/media/v4l2-core/v4l2-ioctl.c
+++ b/drivers/media/v4l2-core/v4l2-ioctl.c
@@ -973,13 +973,48 @@ static int check_fmt(struct file *file, enum v4l2_buf_type type)
         return -EINVAL;
 }
 
+static void v4l_sanitize_format(struct v4l2_format *fmt)
+{
+        unsigned int offset;
+
+        /*
+         * The v4l2_pix_format structure has been extended with fields that were
+         * not previously required to be set to zero by applications. The priv
+         * field, when set to a magic value, indicates the the extended fields
+         * are valid. Otherwise they will contain undefined values. To simplify
+         * the API towards drivers zero the extended fields and set the priv
+         * field to the magic value when the extended pixel format structure
+         * isn't used by applications.
+         */
+
+        if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE &&
+            fmt->type != V4L2_BUF_TYPE_VIDEO_OUTPUT)
+                return;
+
+        if (fmt->fmt.pix.priv == V4L2_PIX_FMT_PRIV_MAGIC)
+                return;
+
+        fmt->fmt.pix.priv = V4L2_PIX_FMT_PRIV_MAGIC;
+
+        offset = offsetof(struct v4l2_pix_format, priv)
+               + sizeof(fmt->fmt.pix.priv);
+        memset(((void *)&fmt->fmt.pix) + offset, 0,
+               sizeof(fmt->fmt.pix) - offset);
+}
+
 static int v4l_querycap(const struct v4l2_ioctl_ops *ops,
                                 struct file *file, void *fh, void *arg)
 {
         struct v4l2_capability *cap = (struct v4l2_capability *)arg;
+        int ret;
 
         cap->version = LINUX_VERSION_CODE;
-        return ops->vidioc_querycap(file, fh, cap);
+
+        ret = ops->vidioc_querycap(file, fh, cap);
+
+        cap->capabilities |= V4L2_CAP_EXT_PIX_FORMAT;
+
+        return ret;
 }
 
 static int v4l_s_input(const struct v4l2_ioctl_ops *ops,
@@ -1103,12 +1138,17 @@ static int v4l_g_fmt(const struct v4l2_ioctl_ops *ops,
         bool is_sdr = vfd->vfl_type == VFL_TYPE_SDR;
         bool is_rx = vfd->vfl_dir != VFL_DIR_TX;
         bool is_tx = vfd->vfl_dir != VFL_DIR_RX;
+        int ret;
+
+        p->fmt.pix.priv = V4L2_PIX_FMT_PRIV_MAGIC;
 
         switch (p->type) {
         case V4L2_BUF_TYPE_VIDEO_CAPTURE:
                 if (unlikely(!is_rx || !is_vid || !ops->vidioc_g_fmt_vid_cap))
                         break;
-                return ops->vidioc_g_fmt_vid_cap(file, fh, arg);
+                ret = ops->vidioc_g_fmt_vid_cap(file, fh, arg);
+                p->fmt.pix.priv = V4L2_PIX_FMT_PRIV_MAGIC;
+                return ret;
         case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
                 if (unlikely(!is_rx || !is_vid || !ops->vidioc_g_fmt_vid_cap_mplane))
                         break;
@@ -1128,7 +1168,9 @@ static int v4l_g_fmt(const struct v4l2_ioctl_ops *ops,
         case V4L2_BUF_TYPE_VIDEO_OUTPUT:
                 if (unlikely(!is_tx || !is_vid || !ops->vidioc_g_fmt_vid_out))
                         break;
-                return ops->vidioc_g_fmt_vid_out(file, fh, arg);
+                ret = ops->vidioc_g_fmt_vid_out(file, fh, arg);
+                p->fmt.pix.priv = V4L2_PIX_FMT_PRIV_MAGIC;
+                return ret;
         case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
                 if (unlikely(!is_tx || !is_vid || !ops->vidioc_g_fmt_vid_out_mplane))
                         break;
@@ -1163,6 +1205,8 @@ static int v4l_s_fmt(const struct v4l2_ioctl_ops *ops,
         bool is_rx = vfd->vfl_dir != VFL_DIR_TX;
         bool is_tx = vfd->vfl_dir != VFL_DIR_RX;
 
+        v4l_sanitize_format(p);
+
         switch (p->type) {
         case V4L2_BUF_TYPE_VIDEO_CAPTURE:
                 if (unlikely(!is_rx || !is_vid || !ops->vidioc_s_fmt_vid_cap))
@@ -1233,6 +1277,8 @@ static int v4l_try_fmt(const struct v4l2_ioctl_ops *ops,
         bool is_rx = vfd->vfl_dir != VFL_DIR_TX;
         bool is_tx = vfd->vfl_dir != VFL_DIR_RX;
 
+        v4l_sanitize_format(p);
+
         switch (p->type) {
         case V4L2_BUF_TYPE_VIDEO_CAPTURE:
                 if (unlikely(!is_rx || !is_vid || !ops->vidioc_try_fmt_vid_cap))
@@ -1516,7 +1562,18 @@ static int v4l_create_bufs(const struct v4l2_ioctl_ops *ops,
         struct v4l2_create_buffers *create = arg;
         int ret = check_fmt(file, create->format.type);
 
-        return ret ? ret : ops->vidioc_create_bufs(file, fh, create);
+        if (ret)
+                return ret;
+
+        v4l_sanitize_format(&create->format);
+
+        ret = ops->vidioc_create_bufs(file, fh, create);
+
+        if (create->format.type == V4L2_BUF_TYPE_VIDEO_CAPTURE ||
+            create->format.type == V4L2_BUF_TYPE_VIDEO_OUTPUT)
+                create->format.fmt.pix.priv = V4L2_PIX_FMT_PRIV_MAGIC;
+
+        return ret;
 }
 
 static int v4l_prepare_buf(const struct v4l2_ioctl_ops *ops,
diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
index a498d8b58679..eb3bdd33816b 100644
--- a/include/uapi/linux/videodev2.h
+++ b/include/uapi/linux/videodev2.h
@@ -268,6 +268,7 @@ struct v4l2_capability {
 #define V4L2_CAP_MODULATOR              0x00080000  /* has a modulator */
 
 #define V4L2_CAP_SDR_CAPTURE            0x00100000  /* Is a SDR capture device */
+#define V4L2_CAP_EXT_PIX_FORMAT         0x00200000  /* Supports the extended pixel format */
 
 #define V4L2_CAP_READWRITE              0x01000000  /* read/write systemcalls */
 #define V4L2_CAP_ASYNCIO                0x02000000  /* async I/O */
@@ -448,6 +449,9 @@ struct v4l2_pix_format {
 #define V4L2_SDR_FMT_CU8          v4l2_fourcc('C', 'U', '0', '8') /* IQ u8 */
 #define V4L2_SDR_FMT_CU16LE       v4l2_fourcc('C', 'U', '1', '6') /* IQ u16le */
 
+/* priv field value to indicates that subsequent fields are valid. */
+#define V4L2_PIX_FMT_PRIV_MAGIC         0xfeedcafe
+
 /*
  *      F O R M A T   E N U M E R A T I O N
  */
@@ -752,7 +756,16 @@ struct v4l2_framebuffer {
 /* FIXME: in theory we should pass something like PCI device + memory
  * region + offset instead of some physical address */
         void                    *base;
-        struct v4l2_pix_format  fmt;
+        struct {
+                __u32           width;
+                __u32           height;
+                __u32           pixelformat;
+                __u32           field;          /* enum v4l2_field */
+                __u32           bytesperline;   /* for padding, zero if unused */
+                __u32           sizeimage;
+                __u32           colorspace;     /* enum v4l2_colorspace */
+                __u32           priv;           /* reserved field, set to 0 */
+        } fmt;
 };
 /*  Flags for the 'capability' field. Read only */
 #define V4L2_FBUF_CAP_EXTERNOVERLAY     0x0001