linux-kernel - [PATCH] drm: Introduce RGB 64-bit 16:16:16:16 float format

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Message-Id: <1511427416-3216-2-git-send-email-tina.zhang@intel.com>
Date:   Thu, 23 Nov 2017 16:56:56 +0800
From:   Tina Zhang <tina.zhang@...el.com>
To:     alex.williamson@...hat.com, kraxel@...hat.com,
        chris@...is-wilson.co.uk, joonas.lahtinen@...ux.intel.com,
        zhenyuw@...ux.intel.com, zhiyuan.lv@...el.com,
        zhi.a.wang@...el.com, kevin.tian@...el.com, daniel@...ll.ch,
        hang.yuan@...el.com
Cc:     Tina Zhang <tina.zhang@...el.com>, intel-gfx@...ts.freedesktop.org,
        intel-gvt-dev@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org,
        Ville Syrjälä 
        <ville.syrjala@...ux.intel.com>, Dave Airlie <airlied@...hat.com>,
        Daniel Vetter <daniel.vetter@...ll.ch>
Subject: [PATCH] drm: Introduce RGB 64-bit 16:16:16:16 float format

The RGB 64-bit 16:16:16:16 float pixel format is needed by some Apps in
windows. The float format in each component is 1:5:10 MSb-sign:exponent:
fraction.

This patch is to introduce the format to drm, so that the windows guest's
framebuffer in this kind of format can be recognized and used by linux
host.

v14:
- add some details about the float pixel format. (Daniel)
- add F suffix to the defined name. (Daniel)

v12:
- send to dri-devel at lists.freedesktop.org. (Ville)

v9:
- separated from framebuffer decoder patch. (Zhenyu) (Xiaoguang)

Signed-off-by: Tina Zhang <tina.zhang@...el.com>
Cc: Ville Syrjälä <ville.syrjala@...ux.intel.com>
Cc: Dave Airlie <airlied@...hat.com>
Cc: Daniel Vetter <daniel.vetter@...ll.ch>
---
 include/uapi/drm/drm_fourcc.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/include/uapi/drm/drm_fourcc.h b/include/uapi/drm/drm_fourcc.h
index 3ad838d..391d2e6 100644
--- a/include/uapi/drm/drm_fourcc.h
+++ b/include/uapi/drm/drm_fourcc.h
@@ -113,6 +113,10 @@ extern "C" {
 
 #define DRM_FORMAT_AYUV		fourcc_code('A', 'Y', 'U', 'V') /* [31:0] A:Y:Cb:Cr 8:8:8:8 little endian */
 
+/* 64 bpp RGB 16:16:16:16 Floating Point */
+#define DRM_FORMAT_XRGB161616F  fourcc_code('X', 'R', '3', 'F') /* [63:0] x:R:G:B 16:16:16:16 little endian */
+#define DRM_FORMAT_XBGR161616F  fourcc_code('X', 'B', '3', 'F') /* [63:0] x:B:G:R 16:16:16:16 little endian */
+
 /*
  * 2 plane RGB + A
  * index 0 = RGB plane, same format as the corresponding non _A8 format has
-- 
2.7.4