[media] v4l: Add ARGB555X and XRGB555X pixel formats

The existing RGB555X pixel format is ill-defined in respect to its alpha
bit and its meaning is driver dependent. Create new standard ARGB555X
and XRGB555X variants with clearly defined meanings and make the
existing variant deprecated.

The new pixel formats 4CC values have been selected to match the DRM
4CCs for the same in-memory formats.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

diff --git a/Documentation/DocBook/media/v4l/pixfmt-packed-rgb.xml b/Documentation/DocBook/media/v4l/pixfmt-packed-rgb.xml
index 2aae8e9..65a1186 100644 (file)
--- a/Documentation/DocBook/media/v4l/pixfmt-packed-rgb.xml
+++ b/Documentation/DocBook/media/v4l/pixfmt-packed-rgb.xml
@@ -237,9 +237,9 @@ for a pixel lie next to each other in memory.</para>
            <entry>g<subscript>4</subscript></entry>
            <entry>g<subscript>3</subscript></entry>
          </row>
-         <row id="V4L2-PIX-FMT-RGB555X">
-           <entry><constant>V4L2_PIX_FMT_RGB555X</constant></entry>
-           <entry>'RGBQ'</entry>
+         <row id="V4L2-PIX-FMT-ARGB555X">
+           <entry><constant>V4L2_PIX_FMT_ARGB555X</constant></entry>
+           <entry>'AR15' | (1 &lt;&lt; 31)</entry>
            <entry></entry>
            <entry>a</entry>
            <entry>r<subscript>4</subscript></entry>
@@ -259,6 +259,28 @@ for a pixel lie next to each other in memory.</para>
            <entry>b<subscript>1</subscript></entry>
            <entry>b<subscript>0</subscript></entry>
          </row>
+         <row id="V4L2-PIX-FMT-XRGB555X">
+           <entry><constant>V4L2_PIX_FMT_XRGB555X</constant></entry>
+           <entry>'XR15' | (1 &lt;&lt; 31)</entry>
+           <entry></entry>
+           <entry>-</entry>
+           <entry>r<subscript>4</subscript></entry>
+           <entry>r<subscript>3</subscript></entry>
+           <entry>r<subscript>2</subscript></entry>
+           <entry>r<subscript>1</subscript></entry>
+           <entry>r<subscript>0</subscript></entry>
+           <entry>g<subscript>4</subscript></entry>
+           <entry>g<subscript>3</subscript></entry>
+           <entry></entry>
+           <entry>g<subscript>2</subscript></entry>
+           <entry>g<subscript>1</subscript></entry>
+           <entry>g<subscript>0</subscript></entry>
+           <entry>b<subscript>4</subscript></entry>
+           <entry>b<subscript>3</subscript></entry>
+           <entry>b<subscript>2</subscript></entry>
+           <entry>b<subscript>1</subscript></entry>
+           <entry>b<subscript>0</subscript></entry>
+         </row>
          <row id="V4L2-PIX-FMT-RGB565X">
            <entry><constant>V4L2_PIX_FMT_RGB565X</constant></entry>
            <entry>'RGBR'</entry>
@@ -800,6 +822,28 @@ image</title>
            <entry>g<subscript>4</subscript></entry>
            <entry>g<subscript>3</subscript></entry>
          </row>
+         <row id="V4L2-PIX-FMT-RGB555X">
+           <entry><constant>V4L2_PIX_FMT_RGB555X</constant></entry>
+           <entry>'RGBQ'</entry>
+           <entry></entry>
+           <entry>a</entry>
+           <entry>r<subscript>4</subscript></entry>
+           <entry>r<subscript>3</subscript></entry>
+           <entry>r<subscript>2</subscript></entry>
+           <entry>r<subscript>1</subscript></entry>
+           <entry>r<subscript>0</subscript></entry>
+           <entry>g<subscript>4</subscript></entry>
+           <entry>g<subscript>3</subscript></entry>
+           <entry></entry>
+           <entry>g<subscript>2</subscript></entry>
+           <entry>g<subscript>1</subscript></entry>
+           <entry>g<subscript>0</subscript></entry>
+           <entry>b<subscript>4</subscript></entry>
+           <entry>b<subscript>3</subscript></entry>
+           <entry>b<subscript>2</subscript></entry>
+           <entry>b<subscript>1</subscript></entry>
+           <entry>b<subscript>0</subscript></entry>
+         </row>
          <row id="V4L2-PIX-FMT-BGR32">
            <entry><constant>V4L2_PIX_FMT_BGR32</constant></entry>
            <entry>'BGR4'</entry>

diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
index 0b1ba5c..1c2f84f 100644 (file)
--- a/include/uapi/linux/videodev2.h
+++ b/include/uapi/linux/videodev2.h
@@ -79,6 +79,7 @@
 /*  Four-character-code (FOURCC) */
 #define v4l2_fourcc(a, b, c, d)\
        ((__u32)(a) | ((__u32)(b) << 8) | ((__u32)(c) << 16) | ((__u32)(d) << 24))
+#define v4l2_fourcc_be(a, b, c, d)     (v4l2_fourcc(a, b, c, d) | (1 << 31))
 
 /*
  *     E N U M S
@@ -307,6 +308,8 @@ struct v4l2_pix_format {
 #define V4L2_PIX_FMT_XRGB555 v4l2_fourcc('X', 'R', '1', '5') /* 16  XRGB-1-5-5-5  */
 #define V4L2_PIX_FMT_RGB565  v4l2_fourcc('R', 'G', 'B', 'P') /* 16  RGB-5-6-5     */
 #define V4L2_PIX_FMT_RGB555X v4l2_fourcc('R', 'G', 'B', 'Q') /* 16  RGB-5-5-5 BE  */
+#define V4L2_PIX_FMT_ARGB555X v4l2_fourcc_be('A', 'R', '1', '5') /* 16  ARGB-5-5-5 BE */
+#define V4L2_PIX_FMT_XRGB555X v4l2_fourcc_be('X', 'R', '1', '5') /* 16  XRGB-5-5-5 BE */
 #define V4L2_PIX_FMT_RGB565X v4l2_fourcc('R', 'G', 'B', 'R') /* 16  RGB-5-6-5 BE  */
 #define V4L2_PIX_FMT_BGR666  v4l2_fourcc('B', 'G', 'R', 'H') /* 18  BGR-6-6-6    */
 #define V4L2_PIX_FMT_BGR24   v4l2_fourcc('B', 'G', 'R', '3') /* 24  BGR-8-8-8     */