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Daniel Vetter
0767935e86
With the previous patch to clean up where exactly these two functions are getting called, this patch can tackle the enable/disable code itself: - WARN if the port enable bit is in the wrong state or if the edp pll bit is in the wrong state, just for paranoia's sake. - Don't disable the edp pll harder in the modeset functions just for fun. - Don't set the edp pll enable flag in intel_dp->DP in modeset, do that while changing the actual hw state. We do the same with the actual port enable bit, so this is a bit more consistent. - Track the current DP register value when setting things up and add some comments how intel_dp->DP is used in the disable code. v2: Be more careful with resetting intel_dp->DP - otherwise dpms off->on will fail spectacularly, becuase we enable the eDP port when we should only enable the eDP pll. Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com> Signed-Off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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* For the very latest on DRI development, please see: *
* http://dri.freedesktop.org/ *
************************************************************
The Direct Rendering Manager (drm) is a device-independent kernel-level
device driver that provides support for the XFree86 Direct Rendering
Infrastructure (DRI).
The DRM supports the Direct Rendering Infrastructure (DRI) in four major
ways:
1. The DRM provides synchronized access to the graphics hardware via
the use of an optimized two-tiered lock.
2. The DRM enforces the DRI security policy for access to the graphics
hardware by only allowing authenticated X11 clients access to
restricted regions of memory.
3. The DRM provides a generic DMA engine, complete with multiple
queues and the ability to detect the need for an OpenGL context
switch.
4. The DRM is extensible via the use of small device-specific modules
that rely extensively on the API exported by the DRM module.
Documentation on the DRI is available from:
http://dri.freedesktop.org/wiki/Documentation
http://sourceforge.net/project/showfiles.php?group_id=387
http://dri.sourceforge.net/doc/
For specific information about kernel-level support, see:
The Direct Rendering Manager, Kernel Support for the Direct Rendering
Infrastructure
http://dri.sourceforge.net/doc/drm_low_level.html
Hardware Locking for the Direct Rendering Infrastructure
http://dri.sourceforge.net/doc/hardware_locking_low_level.html
A Security Analysis of the Direct Rendering Infrastructure
http://dri.sourceforge.net/doc/security_low_level.html