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linux/drivers/gpu/drm
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Chris Wilson 0de009c900 drm/i915/crt: Remove 0xa0 probe for VGA 
This is a moral revert of 6ec3d0c0e9.

Following the fix to reset the GMBUS controller after a NAK, we finally
utilize the 0xa0 probe for a CRT connection. And discover that the code
is broken. Shock.

There are a number of issues, but following a key insight from Dave
Airlie, that 0xA0 is an invalid address on a 7-bit bus (though not if we
were to enable 10-bit addressing), and would look like the EDID port
0x50, it is possible to see where the confusion starts.

In short, a write to 0xA0 is accepted by the GMBUS controller which we
interpreted as meaning the existence of a connection (a slave on the
other end of the wire ACKing the write). That was false.

During testing with a broken GMBUS implementation, which never reset an
earlier NAK, this test always reported a NAK and so we proceeded on to
the next test.

Reported-and-tested-by: Sitsofe Wheeler <sitsofe@yahoo.com>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=35904
Reported-and-tested-by:  Riccardo Magliocchetti <riccardo.magliocchetti@gmail.com>
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=32612
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Acked-by: Dave Airlie <airlied@linux.ie>
Signed-off-by: Keith Packard <keithp@keithp.com>
2011-04-05 09:05:34 -07:00
..
i2c
i810 drm: rework PCI/platform driver interface. 2011-02-07 13:09:36 +10:00
i915 drm/i915/crt: Remove 0xa0 probe for VGA 2011-04-05 09:05:34 -07:00
mga drm: rework PCI/platform driver interface. 2011-02-07 13:09:36 +10:00
nouveau Merge commit '5359533801e3dd3abca5b7d3d985b0b33fd9fe8b' into drm-core-next 2011-03-16 11:34:41 +10:00
r128 drm: rework PCI/platform driver interface. 2011-02-07 13:09:36 +10:00
radeon drm/radeon: fixup refcounts in radeon dumb create ioctl. 2011-03-17 13:58:34 +10:00
savage drm: rework PCI/platform driver interface. 2011-02-07 13:09:36 +10:00
sis drm: rework PCI/platform driver interface. 2011-02-07 13:09:36 +10:00
tdfx drm: rework PCI/platform driver interface. 2011-02-07 13:09:36 +10:00
ttm Revert "ttm: Include the 'struct dev' when using the DMA API." 2011-02-23 14:24:01 +10:00
via drm: rework PCI/platform driver interface. 2011-02-07 13:09:36 +10:00
vmwgfx Revert "ttm: Include the 'struct dev' when using the DMA API." 2011-02-23 14:24:01 +10:00
ati_pcigart.c
drm_agpsupport.c
drm_auth.c
drm_buffer.c
drm_bufs.c
drm_cache.c
drm_context.c
drm_crtc.c drm: dumb scanout create/mmap for intel/radeon (v3) 2011-02-07 12:16:14 +10:00
drm_crtc_helper.c Merge branch 'drm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/airlied/drm-2.6 2011-02-04 10:02:22 -08:00
drm_debugfs.c
drm_dma.c
drm_dp_i2c_helper.c
drm_drv.c drm/core: add ioctl to query device/driver capabilities 2011-03-04 14:47:30 +10:00
drm_edid.c drm: Retry i2c transfer of EDID block after failure 2011-03-16 11:25:13 +10:00
drm_edid_modes.h drm: Mark constant arrays of drm_display_mode const 2011-02-23 11:13:11 +10:00
drm_encoder_slave.c
drm_fb_helper.c Merge commit '5359533801e3dd3abca5b7d3d985b0b33fd9fe8b' into drm-core-next 2011-03-16 11:34:41 +10:00
drm_fops.c drm/switcheroo: track state of switch in drivers. 2011-01-05 13:45:30 +10:00
drm_gem.c drm: Fix use-after-free in drm_gem_vm_close() 2011-03-21 09:15:22 +10:00
drm_global.c
drm_hashtab.c drm: Remove unused members from struct drm_open_hash 2011-02-23 11:16:40 +10:00
drm_info.c Merge remote branch 'intel/drm-intel-next' of ../drm-next into drm-core-next 2011-03-14 14:15:13 +10:00
drm_ioc32.c
drm_ioctl.c drm/kernel: vblank wait on crtc > 1 2011-03-21 09:25:54 +10:00
drm_irq.c drm/kernel: vblank wait on crtc > 1 2011-03-21 09:25:54 +10:00
drm_lock.c
drm_memory.c
drm_mm.c drm: mm: add helper to unwind scan state 2011-02-23 10:32:57 +10:00
drm_modes.c drm: Mark constant arrays of drm_display_mode const 2011-02-23 11:13:11 +10:00
drm_pci.c drm: rework PCI/platform driver interface. 2011-02-07 13:09:36 +10:00
drm_platform.c drm: rework PCI/platform driver interface. 2011-02-07 13:09:36 +10:00
drm_proc.c
drm_scatter.c
drm_sman.c
drm_stub.c drm: add usb framework 2011-02-07 13:09:42 +10:00
drm_sysfs.c drm: Hold the mode mutex whilst probing for sysfs status 2011-03-16 11:23:04 +10:00
drm_trace.h
drm_trace_points.c
drm_usb.c drm: add usb framework 2011-02-07 13:09:42 +10:00
drm_vm.c
Kconfig drm/i810: remove the BKL 2011-02-07 12:15:04 +10:00
Makefile drm: add usb framework 2011-02-07 13:09:42 +10:00
README.drm

README.drm 

************************************************************
* 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