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b7884eb45e
linux-next/drivers/gpu/drm
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Daniel Vetter b7884eb45e drm/i915: hold forcewake around ring hw init 
Empirical evidence suggests that we need to: On at least one ivb
machine when running the hangman i-g-t test, the rings don't properly
initialize properly - the RING_START registers seems to be stuck at
all zeros.

Holding forcewake around this register init sequences makes chip reset
reliable again. Note that this is not the first such issue:

commit f01db988ef
Author: Sean Paul <seanpaul@chromium.org>
Date:   Fri Mar 16 12:43:22 2012 -0400

    drm/i915: Add wait_for in init_ring_common

added delay loops to make RING_START and RING_CTL initialization
reliable on the blt ring at boot-up. So I guess it won't hurt if we do
this unconditionally for all force_wake needing gpus.

To avoid copy&pasting of the HAS_FORCE_WAKE check I've added a new
intel_info bit for that.

v2: Fixup missing commas in static struct and properly handling the
error case in init_ring_common, both noticed by Jani Nikula.

Cc: stable@vger.kernel.org
Reported-and-tested-by: Yang Guang <guang.a.yang@intel.com>
Reviewed-by: Eugeni Dodonov <eugeni.dodonov@intel.com>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=50522
Signed-Off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
2012-06-04 20:25:29 +02:00
..
ast drm: update ast/cirrus/mgag200 for change in TTM api 2012-05-23 14:08:41 +01:00
cirrus drm: update ast/cirrus/mgag200 for change in TTM api 2012-05-23 14:08:41 +01:00
exynos Merge branch 'exynos-drm-next' of git://git.infradead.org/users/kmpark/linux-samsung into drm-core-next 2012-05-22 10:39:57 +01:00
gma500 drm: Constify drm_mode_config_funcs pointer 2012-05-22 10:35:07 +01:00
i2c drm: add convenience function to create an range property 2012-02-09 10:15:25 +00:00
i810 kill mm argument of vm_munmap() 2012-04-21 01:58:20 -04:00
i915 drm/i915: hold forcewake around ring hw init 2012-06-04 20:25:29 +02:00
mga drm: move pci bus master enable into driver. 2012-02-16 18:31:07 +00:00
mgag200 drm: update ast/cirrus/mgag200 for change in TTM api 2012-05-23 14:08:41 +01:00
nouveau Merge branch 'drm-core-next' of git://people.freedesktop.org/~airlied/linux 2012-05-24 12:42:54 -07:00
r128 drm: move pci bus master enable into driver. 2012-02-16 18:31:07 +00:00
radeon drm/radeon: fix XFX quirk 2012-05-29 11:08:19 +01:00
savage drm: checking the wrong variable in savage_do_init_bci() 2012-05-17 11:42:27 +01:00
sis drm: move pci bus master enable into driver. 2012-02-16 18:31:07 +00:00
tdfx drm: Make the per-driver file_operations struct const 2011-11-11 11:14:47 +00:00
ttm ttm: add prime sharing support to TTM (v2) 2012-05-23 10:46:27 +01:00
udl drm/udl: remove unused variables. 2012-05-29 13:47:59 +01:00
via drm: move pci bus master enable into driver. 2012-02-16 18:31:07 +00:00
vmwgfx ttm: add prime sharing support to TTM (v2) 2012-05-23 10:46:27 +01:00
ati_pcigart.c gpu: Add export.h as required to drivers/gpu files. 2011-10-31 19:32:03 -04:00
drm_agpsupport.c
drm_auth.c drm: Fix authentication kernel crash 2012-01-25 09:27:45 +00:00
drm_buffer.c gpu: Add export.h as required to drivers/gpu files. 2011-10-31 19:32:03 -04:00
drm_bufs.c VM: add "vm_mmap()" helper function 2012-04-20 17:29:13 -07:00
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: serialize access to list of debugfs files 2011-11-11 11:05:19 +00:00
drm_dma.c gpu: Add export.h as required to drivers/gpu files. 2011-10-31 19:32:03 -04:00
drm_dp_i2c_helper.c
drm_drv.c drm: add generic ioctls to get/set properties on any object 2012-05-17 11:11:22 +01:00
drm_edid_load.c drm: Don't initialize local ret variable when not needed 2012-05-22 10:32:58 +01:00
drm_edid_modes.h drm: replace open-coded ARRAY_SIZE with macro 2012-04-20 13:12:16 +01:00
drm_edid.c drm: Store vendor IDs directly in the EDID quirk structure 2012-04-27 08:25:13 +01:00
drm_encoder_slave.c gpu: add module.h to drivers/gpu files as required. 2011-10-31 19:32:03 -04:00
drm_fb_helper.c drm: Make the CRTC gamma_set operation optional 2012-05-22 10:35:15 +01:00
drm_fops.c drm: Releasing FBs before releasing GEM objects during drm_release 2012-04-19 14:40:41 +01:00
drm_gem.c drm/prime: add exported buffers to current fprivs imported buffer list (v2) 2012-05-23 10:46:03 +01:00
drm_global.c
drm_hashtab.c gpu: Add export.h as required to drivers/gpu files. 2011-10-31 19:32:03 -04:00
drm_info.c
drm_ioc32.c drivers/gpu/drm/drm_ioc32.c: initialize all fields 2012-02-03 09:47:32 +00:00
drm_ioctl.c drm/prime: expose capability flags for userspace. 2012-05-18 11:12:16 +01:00
drm_irq.c drm: Don't initialize local ret variable when not needed 2012-05-22 10:32:58 +01:00
drm_lock.c drm: Don't initialize local ret variable when not needed 2012-05-22 10:32:58 +01:00
drm_memory.c drm: remove unused code 2012-02-29 10:18:29 +00:00
drm_mm.c gpu: Add export.h as required to drivers/gpu files. 2011-10-31 19:32:03 -04:00
drm_modes.c drm: Add drm_mode_copy() 2012-03-15 09:52:51 +00:00
drm_pci.c drm: move pci bus master enable into driver. 2012-02-16 18:31:07 +00:00
drm_platform.c drm: cope with platformdev->id == -1 2012-03-07 14:03:40 +00:00
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 gpu: Add export.h as required to drivers/gpu files. 2011-10-31 19:32:03 -04:00
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: Miscellaneous typo fixes and documentation updates 2012-05-22 10:34:33 +01:00
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: pass dev to drm_vm_{open,close}_locked() 2012-05-11 17:37:46 +01:00
Kconfig drm/kms: driver for virtual cirrus under qemu 2012-05-17 11:02:24 +01:00
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