drm/bridge: make bridge registration independent of drm flow
authorAjay Kumar <ajaykumar.rs@samsung.com>
Tue, 20 Jan 2015 16:38:44 +0000 (22:08 +0530)
committerThierry Reding <treding@nvidia.com>
Wed, 28 Jan 2015 07:45:40 +0000 (08:45 +0100)
commit3d3f8b1f8b62c3a010976269df454baa9246fc65
tree855bd2b86afa52afbd7b872959789b028ff630ce
parentb07b90fd178a4797b0454ead491b717b41046bee
drm/bridge: make bridge registration independent of drm flow

Currently, third party bridge drivers(ptn3460) are dependent
on the corresponding encoder driver init, since bridge driver
needs a drm_device pointer to finish drm initializations.
The encoder driver passes the drm_device pointer to the
bridge driver. Because of this dependency, third party drivers
like ptn3460 doesn't adhere to the driver model.

In this patch, we reframe the bridge registration framework
so that bridge initialization is split into 2 steps, and
bridge registration happens independent of drm flow:
--Step 1: gather all the bridge settings independent of drm and
  add the bridge onto a global list of bridges.
--Step 2: when the encoder driver is probed, call drm_bridge_attach
  for the corresponding bridge so that the bridge receives
  drm_device pointer and continues with connector and other
  drm initializations.

The old set of bridge helpers are removed, and a set of new helpers
are added to accomplish the 2 step initialization.

The bridge devices register themselves onto global list of bridges
when they get probed by calling "drm_bridge_add".

The parent encoder driver waits till the bridge is available
in the lookup table(by calling "of_drm_find_bridge") and then
continues with its initialization.

The encoder driver should also call "drm_bridge_attach" to pass
on the drm_device to the bridge object.

drm_bridge_attach inturn calls "bridge->funcs->attach" so that
bridge can continue with drm related initializations.

Signed-off-by: Ajay Kumar <ajaykumar.rs@samsung.com>
Acked-by: Inki Dae <inki.dae@samsung.com>
Tested-by: Rahul Sharma <rahul.sharma@samsung.com>
Tested-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
Tested-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
Tested-by: Sjoerd Simons <sjoerd.simons@collabora.co.uk>
Signed-off-by: Thierry Reding <treding@nvidia.com>
drivers/gpu/drm/Makefile
drivers/gpu/drm/bridge/ptn3460.c
drivers/gpu/drm/drm_bridge.c [new file with mode: 0644]
drivers/gpu/drm/drm_crtc.c
drivers/gpu/drm/msm/hdmi/hdmi.c
drivers/gpu/drm/msm/hdmi/hdmi.h
drivers/gpu/drm/msm/hdmi/hdmi_bridge.c
drivers/gpu/drm/sti/sti_hda.c
drivers/gpu/drm/sti/sti_hdmi.c
include/drm/bridge/ptn3460.h
include/drm/drm_crtc.h