linux-stable.git/drivers/gpu/drm/drm_sysfs.c, branch v4.1

drm: fix writing to /sys/class/drm/*/status

2015-06-05T22:27:30+00:00

Writing to a file is supposed to return the number of bytes written.
Returning zero unfortunately causes bash to constantly spin trying
to write to the sysfs file, to such an extent that even ^c and ^z
have no effect.  The only way out of that is to kill the shell and
log back in.  This isn't nice behaviour.

Fix it by returning the number of characters written to sysfs files.

[airlied: used suggestion from Al Viro]
Signed-off-by: Russell King 
Reviewed-by: Chris Wilson 
Signed-off-by: Dave Airlie

drm: Lighten sysfs connector 'status'

2015-03-10T08:59:36+00:00

Since the beginning, sysfs/connector/status has done a heavyweight
detection of the current connector status. But no user, such as upowerd
or logind, has ever desired to initiate a probe. Move the probing into a
new attribute so that existing readers get the behaviour they desire.

v2: David Herrmann suggested using "echo detect > /sys/.../status" to
trigger the probing, which is a fine idea. This extends that to also
allow the user to apply the force detection overrides at runtime.

v3: Now with airlied's email address fixed! Requires sysfs_streq()

Signed-off-by: Chris Wilson 
Cc: Daniel Vetter 
Cc: David Herrmann 
Cc: Dave Airlie 
Cc: Alex Deucher 
Reviewed-by: David Herrmann 
Reviewed-by: Alex Deucher 
Signed-off-by: Daniel Vetter

drm: Use static attribute groups for managing connector sysfs entries

2015-02-04T14:02:00+00:00

Instead of manual calls of device_create_file() and
device_remove_file(), assign the static attribute groups to the device
with device_create_with_groups().  The conditionally built sysfs
entries are handled via is_visible callback.

This simplifies the code and also avoids the possible races.

Signed-off-by: Takashi Iwai 
Signed-off-by: Daniel Vetter

drm: Move piles of functions from drmP.h to drm_internal.h

2014-09-12T09:16:29+00:00

This way drivers can't grow crazy ideas any more, and it also
helps a bit in reviewing EXPORT_SYMBOLS.

v2: Even more stuff. Unfortunately we can't move drm_vm_open_locked
because exynos does some horrible stuff with it.

Signed-off-by: Daniel Vetter

drm: make sysfs device always available for minors

2014-08-05T14:08:21+00:00

For each minor we allocate a sysfs device as minor->kdev. Currently, this
is allocated and registered in drm_minor_register(). This makes it
impossible to add sysfs-attributes to the device before it is registered.
Therefore, they are not added atomically, nor can we move device_add()
*after* ->load() is called.

This patch makes minor->kdev available early, but only adds the device
during minor-registration. Note that the registration is still called
before ->load() as debugfs needs to be split, too. This will be fixed in
follow-ups.

Reviewed-by: Daniel Vetter 
Reviewed-by: Alex Deucher 
Signed-off-by: David Herrmann

drm: add register and unregister functions for connectors

2014-06-19T06:55:28+00:00

Introduce generic functions to register and unregister connectors. This
provides a common place to add and remove associated user space
interfaces.

Signed-off-by: Thomas Wood 
Reviewed-by: David Herrmann 
Signed-off-by: Daniel Vetter

drm: replace drm_get_connector_name() with direct name field use

2014-06-04T03:17:41+00:00

Generated using semantic patch:

@@
expression E;
@@

- drm_get_connector_name(E)
+ E->name

[airlied: regenerated]

Acked-by: David Herrmann 
Signed-off-by: Jani Nikula 
Signed-off-by: Dave Airlie

drm/sysfs: fix OOM verification

2013-11-28T04:35:23+00:00

Copy/Paste typo.. we need to test for ->kdev instead of ->dev.

Reported-by: Juha Leppänen 
Signed-off-by: David Herrmann 
Signed-off-by: Dave Airlie

drm/sysfs: fix hotplug regression since lifetime changes

2013-11-21T11:10:00+00:00

airlied:
The lifetime changes introduced in 5bdebb183c9702a8c57a01dff09337be3de337a6
tried to use device_create, however that led to the regression where dev->type
wasn't getting set correctly. First attempt at fixing it would have led to
a race, so this undoes the device_createa work and does it all manually
making sure the dev->type is setup before we register the device.

Signed-off-by: David Herrmann 
Signed-off-by: Dave Airlie

drm/sysfs: Remove stale comments about calling drm_sysfs_connector_add() multiple times

2013-11-06T03:41:37+00:00

drm_connector_sysfs_add() explicitly checks if connector->kdev
is already populated and returns success. So it clearly now allows
being called multiple times. Remove some stale comments to the contrary.

Signed-off-by: Ville Syrjälä 
Reviewed-by: Jani Nikula 
Signed-off-by: Dave Airlie