Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-12-25 12:21:37 +00:00
Code Issues Packages Projects Releases Wiki Activity
3b7a89fce3
linux/drivers/gpu/drm
History
Daniel Vetter 3b7a89fce3 drm/i915: fix OOPS in lid_notify 
This goes back to

commit c1c7af6089
Author: Jesse Barnes <jbarnes@virtuousgeek.org>
Date:   Thu Sep 10 15:28:03 2009 -0700

    drm/i915: force mode set at lid open time

It was used to fix an issue on a i915GM based Thinkpad X41, which
somehow clobbered the modeset state at lid close time. Since then
massive amounts of things changed: Tons of fixes to the modeset
sequence, OpRegion support, better integration with the acpi code.
Especially OpRegion /should/ allow us to control the display hw
cooperatively with the firmware, without the firmware clobbering the
hw state behind our backs.

So it's dubious whether we still need this.

The second issue is that it's unclear who's responsibility it actually
is to restore the mode - Chris Wilson suggests to just emit a hotplug
event and let userspace figure things out.

The real reason I've stumbled over this is that the new modeset code
breaks drm_helper_resume_force_mode - it OOPSes derefing a NULL vfunc
pointer. The reason this wasn't caught in testing earlier is that in

commit c9354c85c1
Author: Linus Torvalds <torvalds@linux-foundation.org>
Date:   Mon Nov 2 09:29:55 2009 -0800

    i915: fix intel graphics suspend breakage due to resume/lid event
    confusion

logic was added to _not_ restore the modeset state after a resume. And
since most machines are configured to auto-suspend on lid-close, this
neatly papered over the issue.

Summarizing, this shouldn't be required on any platform supporting
OpRegion. And none of the really old machines I have here seem to
require it either. Hence I'm inclined to just rip it out.

But in case that there are really firmwares out there that clobber the
hw state, replace it with a call to intel_modset_check_state. This
will ensure that we catch any issues as soon as they happen.

Cc: Chris Wilson <chris@chris-wilson.co.uk>
Acked-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
2012-09-18 00:59:37 +02:00
..
ast drm/ast: fix EDID memory leak 2012-08-24 09:37:09 +10:00
cirrus drm/cirrus: Remove unused validate_sequence 2012-08-24 09:34:46 +10:00
exynos drm: remove the raw_edid field from struct drm_display_info 2012-08-24 09:37:36 +10:00
gma500 gma500: Fix frequency detection 2012-08-24 17:02:42 +10:00
i2c drm/i2c/ch7006: Convert to dev_pm_ops 2012-08-24 09:56:08 +10:00
i810 drm: kill dma queue support 2012-07-19 22:50:55 -04:00
i915 drm/i915: fix OOPS in lid_notify 2012-09-18 00:59:37 +02:00
mga drm: kill reclaim_buffers callback 2012-07-19 22:50:28 -04:00
mgag200 drm: remove the raw_edid field from struct drm_display_info 2012-08-24 09:37:36 +10:00
nouveau vga_switcheroo: Don't require handler init callback 2012-08-17 17:34:41 -04:00
r128 drm: kill reclaim_buffers callback 2012-07-19 22:50:28 -04:00
radeon drm/radeon/ss: use num_crtc rather than hardcoded 6 2012-08-21 18:52:56 -04:00
savage drm/savage: clean up reclaim_buffers 2012-07-19 22:50:16 -04:00
sis drm/sis: fixup sis_mm ioctl structs 2012-07-19 22:51:58 -04:00
tdfx drm: kill reclaim_buffers callback 2012-07-19 22:50:28 -04:00
ttm drm: Handle io prot correctly for MIPS. 2012-08-24 09:41:05 +10:00
udl Merge branch 'for-airlied' of git://people.freedesktop.org/~danvet/drm-intel into drm-next 2012-09-03 12:05:01 +10:00
via drm/via: clean up reclaim_buffers 2012-07-19 22:48:28 -04:00
vmwgfx drm: stop vmgfx driver explosion 2012-08-22 09:26:50 +10:00
ati_pcigart.c
drm_agpsupport.c
drm_auth.c
drm_buffer.c
drm_bufs.c drm: kill dma queue support 2012-07-19 22:50:55 -04:00
drm_cache.c Merge branch 'drm-intel-next' of git://people.freedesktop.org/~danvet/drm-intel into drm-core-next 2012-04-12 10:27:01 +01:00
drm_context.c drm: Unify and fix idr error handling 2012-04-24 09:50:20 +01:00
drm_crtc_helper.c drm: Don't initialize local ret variable when not needed 2012-05-22 10:32:58 +01:00
drm_crtc.c drm: Use stdint types for consistency 2012-05-29 11:07:09 +01:00
drm_debugfs.c drm: kill dma queue support 2012-07-19 22:50:55 -04:00
drm_dma.c drm: kill dma queue support 2012-07-19 22:50:55 -04:00
drm_dp_i2c_helper.c
drm_drv.c drm: kill dma queue support 2012-07-19 22:50:55 -04:00
drm_edid_load.c drm: remove the raw_edid field from struct drm_display_info 2012-08-24 09:37:36 +10:00
drm_edid_modes.h drm: replace open-coded ARRAY_SIZE with macro 2012-04-20 13:12:16 +01:00
drm_edid.c drm: remove the raw_edid field from struct drm_display_info 2012-08-24 09:37:36 +10:00
drm_encoder_slave.c
drm_fb_helper.c drm/fb helper: don't call drm_helper_connector_dpms directly 2012-09-08 00:51:15 +02:00
drm_fops.c drm: track dev_mapping in more robust and flexible way 2012-07-25 14:09:30 +10:00
drm_gem.c drm: Add colouring to the range allocator 2012-07-16 05:59:37 +10:00
drm_global.c
drm_hashtab.c
drm_info.c drm: kill dma queue support 2012-07-19 22:50:55 -04:00
drm_ioc32.c
drm_ioctl.c drm/prime: expose capability flags for userspace. 2012-05-18 11:12:16 +01:00
drm_irq.c drm: Add missing static storage class specifier in drm_irq.c file 2012-08-24 10:00:56 +10:00
drm_lock.c drm: ditch strange DRIVER_DMA_QUEUE only error bail-out 2012-07-19 22:50:47 -04:00
drm_memory.c
drm_mm.c drm: Add colouring to the range allocator 2012-07-16 05:59:37 +10:00
drm_modes.c drm: Remove two unused fields from struct drm_display_mode 2012-08-22 09:27:27 +10:00
drm_pci.c drm/pci: add support for getting the supported link bw. 2012-07-19 22:29:25 -04:00
drm_platform.c
drm_prime.c drm/prime: add exported buffers to current fprivs imported buffer list (v2) 2012-05-23 10:46:03 +01:00
drm_proc.c drm: Add missing static storage class specifiers in drm_proc.c file 2012-08-22 09:30:00 +10:00
drm_scatter.c
drm_stub.c drm: Don't initialize local ret variable when not needed 2012-05-22 10:32:58 +01:00
drm_sysfs.c drm: fail gracefully when proc isn't setup. 2012-07-16 05:57:03 +10:00
drm_trace_points.c
drm_trace.h
drm_usb.c drm/usb: fix module license on drm/usb layer. 2012-04-19 09:33:32 +01:00
drm_vm.c drm: Handle io prot correctly for MIPS. 2012-08-24 09:41:05 +10:00
Kconfig Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux into drm-next 2012-08-27 16:22:20 +10:00
Makefile drm/kms: driver for virtual cirrus under qemu 2012-05-17 11:02:24 +01:00
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