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ddc9003c35
For any given clock we can use the find_pll to get the corresponding DPLL setting. It is unnecessary to use the find_reduce_pll callback function to calculate the DPLL parameter for LVDS downclock in order to get the same divider factor(P) for the normal and downclock. In theory when the LVDS downclock is supported by LVDS panel, we should get the same DPLL divider factor(P) for the normal clock and reduced downclock. If we get the diferent divider factor(P) for normal clock and reduced downclock, it means that the found downclock is incorrect and should be discarded. So we should use find_pll callback to calculate the DPLL parameter for the LVDS reduced downclock as for the normal clock. Then we can do the cleanup about find_reduced_pll. Signed-off-by: Zhao Yakui <yakui.zhao@intel.com> cc: Jesse Barnes <jbarnes@virtuousgeek.org> cc: Matthew Garrett <mjg@redhat.com> Signed-off-by: Eric Anholt <eric@anholt.net>
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* For the very latest on DRI development, please see: *
* http://dri.freedesktop.org/ *
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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