drm/uapi: Deprecate DRM_MODE_FLAG_PIXMUX

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

Looks like this flag had something to do the the controller<->ramdac
interface with some ancient S3 graphics adapters. Why someone though
it would be a good idea to expose it directly to users I don't know.
And later on it got copied into the randr protocol and kms uapi.

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/20171114183258.16976-4-ville.syrjala@linux.intel.com
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Jose Abreu <joabreu@synopsys.com>

diff --git a/include/drm/drm_modes.h b/include/drm/drm_modes.h
index 9f3421c..bce5733 100644 (file)
--- a/include/drm/drm_modes.h
+++ b/include/drm/drm_modes.h
@@ -300,7 +300,7 @@ struct drm_display_mode {
         *  - 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_PIXMUX: not used?
+        *  - DRM_MODE_FLAG_PIXMUX: <deprecated>
         *  - DRM_MODE_FLAG_DBLCLK: double-clocked mode.
         *  - DRM_MODE_FLAG_CLKDIV2: half-clocked mode.
         *

diff --git a/include/uapi/drm/drm_mode.h b/include/uapi/drm/drm_mode.h
index 004db47..8d872e1 100644 (file)
--- a/include/uapi/drm/drm_mode.h
+++ b/include/uapi/drm/drm_mode.h
@@ -75,7 +75,7 @@ extern "C" {
 #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_PIXMUX                   (1<<11)
+#define DRM_MODE_FLAG_PIXMUX                   (1<<11) /* deprecated */
 #define DRM_MODE_FLAG_DBLCLK                   (1<<12)
 #define DRM_MODE_FLAG_CLKDIV2                  (1<<13)
  /*
@@ -118,7 +118,6 @@ extern "C" {
                                 DRM_MODE_FLAG_NCSYNC |         \
                                 DRM_MODE_FLAG_HSKEW |          \
                                 DRM_MODE_FLAG_BCAST |          \
-                                DRM_MODE_FLAG_PIXMUX |         \
                                 DRM_MODE_FLAG_DBLCLK |         \
                                 DRM_MODE_FLAG_CLKDIV2 |        \
                                 DRM_MODE_FLAG_3D_MASK)