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00d70b1512
linux/drivers/gpu/drm
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Chris Wilson 00d70b1512 drm/i915: skip redundant operations whilst enabling pipes and planes 
If the pipe or plane is already enabled, then we do not need to enable
it again and can skip the delay. Similarly if it is already disabled
when we want to disable it, we can also skip it.

This fixes a regression from b24e717988, which caused the LVDS
output on one PineView machine to become corrupt after changing
orientation several times.

References: https://bugs.freedesktop.org/show_bug.cgi?id=34601
Cc: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Keith Packard <keithp@keithp.com>
Tested-by: mengmeng.meng@intel.com
2011-03-23 06:41:02 +00:00
..
i2c
i810 drm: rework PCI/platform driver interface. 2011-02-07 13:09:36 +10:00
i915 drm/i915: skip redundant operations whilst enabling pipes and planes 2011-03-23 06:41:02 +00:00
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: kill drm_agp_chipset_flush 2010-11-23 20:14:44 +00:00
drm_auth.c
drm_buffer.c
drm_bufs.c
drm_cache.c
drm_context.c
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_crtc.c drm: dumb scanout create/mmap for intel/radeon (v3) 2011-02-07 12:16:14 +10:00
drm_debugfs.c drm: Move the GTT accounting to i915 2010-10-01 14:45:20 +01:00
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_modes.h drm: Mark constant arrays of drm_display_mode const 2011-02-23 11:13:11 +10:00
drm_edid.c drm: Retry i2c transfer of EDID block after failure 2011-03-16 11:25:13 +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: readd drm_lock_free in drm_unlock 2010-09-26 13:35:49 +10:00
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: Move the GTT accounting to i915 2010-10-01 14:45:20 +01:00
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_points.c
drm_trace.h
drm_usb.c drm: add usb framework 2011-02-07 13:09:42 +10:00
drm_vm.c Merge remote branch 'korg/drm-fixes' into drm-vmware-next 2010-10-06 11:10:48 +10:00
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