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drm/uapi: Deprecate DRM_MODE_FLAG_BCAST 

Reject any mode with DRM_MODE_FLAG_BCAST. We have no code that even
checks for this flag hence it can't possibly do any good.

I think this maybe originated from fbdev where it was supposed to
indicate PAL/NTSC broadcast timings. I have no idea why those would
have to be identified by a flag rather than by just the timings
themselves. And then I assume it got copied into xfree86 for
fbdevhw, and later on it leaked into the randr protocol and kms uapi.

Since kms fbdev emulation never uses the corresponding fbdev flag
there should be no sane way for this to come back into kms via
userspace either.

Cc: Jose Abreu <Jose.Abreu@synopsys.com>
Cc: Adam Jackson <ajax@redhat.com>
Cc: Keith Packard <keithp@keithp.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171114183258.16976-5-ville.syrjala@linux.intel.com
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Jose Abreu <joabreu@synopsys.com>
This commit is contained in:
Ville Syrjälä 2017-11-14 20:32:52 +02:00
parent d15f40c84c
commit 05ebac0980
2 changed files with 2 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
include/drm/drm_modes.h
View File

@ -299,7 +299,7 @@ struct drm_display_mode {
* - DRM_MODE_FLAG_PCSYNC: composite sync is active high.
* - DRM_MODE_FLAG_NCSYNC: composite sync is active low.
* - DRM_MODE_FLAG_HSKEW: hskew provided (not used?).
* - DRM_MODE_FLAG_BCAST: not used?
* - DRM_MODE_FLAG_BCAST: <deprecated>
* - DRM_MODE_FLAG_PIXMUX: <deprecated>
* - DRM_MODE_FLAG_DBLCLK: double-clocked mode.
* - DRM_MODE_FLAG_CLKDIV2: half-clocked mode.

3
include/uapi/drm/drm_mode.h
View File

@ -74,7 +74,7 @@ extern "C" {
#define DRM_MODE_FLAG_PCSYNC (1<<7)
#define DRM_MODE_FLAG_NCSYNC (1<<8)
#define DRM_MODE_FLAG_HSKEW (1<<9) /* hskew provided */
#define DRM_MODE_FLAG_BCAST (1<<10)
#define DRM_MODE_FLAG_BCAST (1<<10) /* deprecated */
#define DRM_MODE_FLAG_PIXMUX (1<<11) /* deprecated */
#define DRM_MODE_FLAG_DBLCLK (1<<12)
#define DRM_MODE_FLAG_CLKDIV2 (1<<13)
@ -117,7 +117,6 @@ extern "C" {
DRM_MODE_FLAG_PCSYNC | \
DRM_MODE_FLAG_NCSYNC | \
DRM_MODE_FLAG_HSKEW | \
DRM_MODE_FLAG_BCAST | \
DRM_MODE_FLAG_DBLCLK | \
DRM_MODE_FLAG_CLKDIV2 | \
DRM_MODE_FLAG_3D_MASK)