Hi Ville,
On Thu, Feb 22, 2018 at 11:42:29PM +0200, Ville Syrjala wrote:
From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
The documentation for the ctm matrix suggests a two's complement
format, but at least the i915 implementation is using sign-magnitude
instead. And looks like malidp is doing the same. Change the docs
to match the current implementation, and change the type from __s64
to __u64 to drive the point home.
I totally agree that this is a good idea, but...
Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx
Cc: Mihail Atanassov <mihail.atanassov@xxxxxxx>
Cc: Liviu Dudau <liviu.dudau@xxxxxxx>
Cc: Brian Starkey <brian.starkey@xxxxxxx>
Cc: Mali DP Maintainers <malidp@xxxxxxxxxxxx>
Cc: Johnson Lin <johnson.lin@xxxxxxxxx>
Cc: Uma Shankar <uma.shankar@xxxxxxxxx>
Cc: Shashank Sharma <shashank.sharma@xxxxxxxxx>
Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
---
include/uapi/drm/drm_mode.h | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/include/uapi/drm/drm_mode.h b/include/uapi/drm/drm_mode.h
index 2c575794fb52..b5d7d9e0eff5 100644
--- a/include/uapi/drm/drm_mode.h
+++ b/include/uapi/drm/drm_mode.h
@@ -598,8 +598,11 @@ struct drm_mode_crtc_lut {
};
struct drm_color_ctm {
- /* Conversion matrix in S31.32 format. */
- __s64 matrix[9];
+ /*
+ * Conversion matrix in S31.32 sign-magnitude
+ * (not two's complement!) format.
+ */
+ __u64 matrix[9];
Isn't changing the type liable to break something for someone?
Thanks,
-Brian
};
struct drm_color_lut {
--
2.16.1
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