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drm: Don't update property values for atomic drivers

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Atomic drivers only use the property value store for immutable (i.e.
can't be set by userspace, but the kernel can still adjust it)
properties. The only tricky part is the removal of the update in
drm_atomic_helper_update_legacy_modeset_state().

This was added in

commit 8c10342cb4 (tag: topic/drm-misc-2015-07-28)
Author: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Date:   Mon Jul 27 13:24:29 2015 +0200

    drm/atomic: Update legacy DPMS state during modesets, v3.

by copying it from the i915 code, where it was originally added in

commit 68d3472047
Author: Daniel Vetter <daniel.vetter@ffwll.ch>
Date:   Thu Sep 6 22:08:35 2012 +0200

    drm/i915: update dpms property in set_mode

for the legacy modeset code. The reason we needed this hack was that
i915 didn't yet set DRIVER_ATOMIC, and we checked for that instead of
the newer-ish drm_drv_uses_atomic_modeset(), which avoids such
troubles. With the correct feature checks this isn't needed anymore at
all.

Also make sure that drivers don't accidentally get this wrong by
making the exported version of drm_object_property_get_value() only
work for legacy drivers. Only gma500 uses it anyway.

v2: Fixup the uses_atomic_modeset() checks (Maarten)

Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20170725120137.1903-1-daniel.vetter@ffwll.ch
This commit is contained in:
Daniel Vetter
2017-07-25 14:01:37 +02:00
parent 3dfeb631a1
commit 4a97a3da42
5 changed files with 33 additions and 27 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/gpu/drm/drm_plane.c
View File

@@ -448,7 +448,7 @@ int drm_mode_plane_set_obj_prop(struct drm_plane *plane,
if (plane->funcs->set_property)
ret = plane->funcs->set_property(plane, property, value);
if (!ret)
if (!ret && !drm_drv_uses_atomic_modeset(property->dev))
drm_object_property_set_value(obj, property, value);
return ret;