mirror of
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2026-04-18 04:09:08 +08:00
bf507ef7aa
Prevent bogus asserts on DDI-related paths. Longer explanation from Eugeni by mail: "For the asserts there are 3 paths where we hit them: - in assert_fdi_tx (we don't have the FDI_TX_CTL anymore, backup plan DDI_FUNC_CTL is used instead) - in assert_fdi_tx_pll_enabled (we have the combination of iCLKIP and DDI_FUNC_CTL, plus PORT_CLK_SEL and PIPE_CLK_SEL now to make things work). We could use an assert here indeed - if we configure port to use one clock, and pipe to use another, everything hangs. Right now, we configure all of them in one place only; but yes, when DP code lands it will get more funky. - and in ironlake_fdi_pll_enable. I reuse part of this function (to configure the TU sizes), but as in the 1st case, FDI_TX_CTL is gone so I just ignore it here." Signed-off-by: Eugeni Dodonov <eugeni.dodonov@intel.com> [danvet: Pasted Eugeni's explanation into the commit message.] Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
************************************************************
* 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