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OpenCloudOS-Kernel/drivers/gpu/drm
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Robert Bragg f279020a02 drm/i915/perf: avoid read back of head register 
There's no need for the driver to keep reading back the head pointer
from hardware since the hardware doesn't update it automatically. This
way we can treat any invalid head pointer value as a software/driver
bug instead of spurious hardware behaviour.

This change is also a small stepping stone towards re-working how
the head and tail state is managed as part of an improved workaround
for the tail register race condition.

Signed-off-by: Robert Bragg <robert@sixbynine.org>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: http://patchwork.freedesktop.org/patch/msgid/20170511154345.962-4-lionel.g.landwerlin@intel.com
 		2017-05-13 10:59:39 +01:00
..
amd Merge tag 'drm-misc-next-2017-04-07' of git://anongit.freedesktop.org/git/drm-misc into drm-next 2017-04-11 07:41:10 +10:00
arc drm: remove drm_vblank_no_hw_counter assignment from driver code 2017-02-07 21:43:55 +01:00
arm drm: mali-dp: use div_u64 for expensive 64-bit divisions 2017-04-26 17:54:58 +01:00
armada dma-buf: Rename dma-ops to prevent conflict with kunmap_atomic macro 2017-04-20 13:47:46 +05:30
ast Merge tag 'drm-misc-next-2017-04-07' of git://anongit.freedesktop.org/git/drm-misc into drm-next 2017-04-11 07:41:10 +10:00
atmel-hlcdc drm: atmel-hlcdc: Uninitialized return in atmel_hlcdc_create_outputs() 2017-04-18 11:52:45 +02:00
bochs drm/ttm: add io_mem_pfn callback 2017-04-04 23:33:42 -04:00
bridge drm: dw-hdmi: Implement the mode_fixup drm helper 2017-04-10 14:53:10 +05:30
cirrus Merge tag 'drm-misc-next-2017-04-07' of git://anongit.freedesktop.org/git/drm-misc into drm-next 2017-04-11 07:41:10 +10:00
etnaviv Linux 4.11-rc7 2017-04-19 11:07:14 +10:00
exynos drm: convert drivers to use drm_of_find_panel_or_bridge 2017-04-06 17:00:27 -04:00
fsl-dcu drm: convert drivers to use drm_of_find_panel_or_bridge 2017-04-06 17:00:27 -04:00
gma500 drm: Add acquire ctx to ->gamma_set hook 2017-04-06 10:21:55 +02:00
hisilicon drm: convert drivers to use drm_of_find_panel_or_bridge 2017-04-06 17:00:27 -04:00
i2c
…
i810 drm/i810: drop device_is_agp callback 2017-01-26 10:44:43 +01:00
i915 drm/i915/perf: avoid read back of head register 2017-05-13 10:59:39 +01:00
imx Merge tag 'drm-misc-next-2017-04-07' of git://anongit.freedesktop.org/git/drm-misc into drm-next 2017-04-11 07:41:10 +10:00
lib drm: Add a simple generator of random permutations 2016-12-27 12:34:00 +01:00
mediatek Merge tag 'drm-misc-next-2017-04-07' of git://anongit.freedesktop.org/git/drm-misc into drm-next 2017-04-11 07:41:10 +10:00
meson drm: convert drivers to use of_graph_get_remote_node 2017-04-06 17:00:27 -04:00
mga lib/vsprintf.c: remove %Z support 2017-02-27 18:43:47 -08:00
mgag200 Merge tag 'drm-misc-next-2017-04-07' of git://anongit.freedesktop.org/git/drm-misc into drm-next 2017-04-11 07:41:10 +10:00
msm Merge branch 'msm-next' of git://people.freedesktop.org/~robclark/linux into drm-next 2017-04-11 07:47:02 +10:00
mxsfb drm: convert drivers to use drm_of_find_panel_or_bridge 2017-04-06 17:00:27 -04:00
nouveau Merge branch 'linux-4.12' of git://github.com/skeggsb/linux into drm-next 2017-05-02 04:46:01 +10:00
omapdrm dma-buf: Rename dma-ops to prevent conflict with kunmap_atomic macro 2017-04-20 13:47:46 +05:30
panel drm/panel: Changes for v4.12-rc1 2017-04-13 06:17:40 +10:00
qxl drm/ttm: add io_mem_pfn callback 2017-04-04 23:33:42 -04:00
r128 gpu: drm: drivers: Convert printk(KERN_<LEVEL> to pr_<level> 2017-03-01 09:44:11 +01:00
radeon Merge tag 'drm-misc-next-2017-04-07' of git://anongit.freedesktop.org/git/drm-misc into drm-next 2017-04-11 07:41:10 +10:00
rcar-du drm: rcar-du: Add HDMI outputs to R8A7795 device description 2017-04-04 17:04:21 +03:00
rockchip drm/rockchip: Shutdown all crtcs when unbinding drm 2017-04-07 13:28:32 -04:00
savage drm: Change the return type of the unload hook to void 2017-01-09 11:25:22 +01:00
selftests drm: kselftest: fix spelling mistake: "misalinged" -> "misaligned" 2017-02-26 22:54:47 +01:00
shmobile drm: Add acquire ctx parameter to ->page_flip(_target) 2017-03-29 09:50:38 +02:00
sis drm: Improve drm_mm search (and fix topdown allocation) with rbtrees 2017-02-03 11:10:32 +01:00
sti drm/sti: fix GDP size to support up to UHD resolution 2017-04-13 11:46:35 +02:00
sun4i Allwinner DRM changes for 4.12 2017-04-20 13:19:34 +10:00
tdfx
…
tegra dma-buf: Rename dma-ops to prevent conflict with kunmap_atomic macro 2017-04-20 13:47:46 +05:30
tilcdc drm: convert drivers to use of_graph_get_remote_node 2017-04-06 17:00:27 -04:00
tinydrm drm/atomic: Introduce drm_atomic_helper_shutdown 2017-03-27 09:43:58 +02:00
ttm Linux 4.11-rc6 2017-04-11 07:40:42 +10:00
udl Merge tag 'drm-misc-next-fixes-2017-04-20' of git://anongit.freedesktop.org/git/drm-misc into drm-next 2017-04-21 13:51:59 +10:00
vc4 Linux 4.11-rc6 2017-04-11 07:40:42 +10:00
vgem Pointer for Markus's image conversion work. 2017-03-14 15:07:33 +01:00
via drm/via: use get_user_pages_unlocked() 2017-02-28 10:00:50 +01:00
virtio Merge tag 'drm-misc-next-2017-04-07' of git://anongit.freedesktop.org/git/drm-misc into drm-next 2017-04-11 07:41:10 +10:00
vmwgfx drm/vmwgfx: Convert macro to octal representation 2017-04-21 09:25:47 -07:00
zte drm: zte: remove leftover 'inf' from struct zx_hdmi 2017-03-22 13:44:42 +08:00
Kconfig drm/fb-helper: Add multi buffer support for cma fbdev 2017-02-26 22:11:37 +01:00
Makefile drm: Add SCDC helpers 2017-03-21 10:15:39 +02:00
ati_pcigart.c
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drm_agpsupport.c drm/i810: drop device_is_agp callback 2017-01-26 10:44:43 +01:00
drm_atomic.c drm: extract legacy framebuffer remove 2017-04-06 10:22:43 +02:00
drm_atomic_helper.c drm/atomic: Add connector atomic_check function, v2. 2017-04-06 17:00:27 -04:00
drm_auth.c drm/core: Use recommened kerneldoc for struct member refs 2017-01-25 16:22:42 +01:00
drm_blend.c drm/blend: Use new atomic iterator macros. 2017-03-06 11:43:43 +01:00
drm_bridge.c drm/bridge: Use recommened kerneldoc for struct member refs 2017-01-02 09:17:26 +01:00
drm_bufs.c
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drm_cache.c gpu: drm: core: Convert printk(KERN_<LEVEL> to pr_<level> 2017-02-28 14:32:19 +01:00
drm_color_mgmt.c drm/atomic-helper: Remove legacy backoff hack from gamma_set 2017-04-06 10:22:35 +02:00
drm_connector.c drm: Rename connector list iterator API 2017-02-28 16:16:48 +01:00
drm_context.c
…
drm_crtc.c drm: Take mode_config.mutex in setcrtc ioctl 2017-04-06 22:49:50 +02:00
drm_crtc_helper.c drm: Add acquire ctx parameter to ->set_config 2017-03-29 09:56:25 +02:00
drm_crtc_helper_internal.h
…
drm_crtc_internal.h drm: extract legacy framebuffer remove 2017-04-06 10:22:43 +02:00
drm_debugfs.c drm/debugfs: Add kerneldoc 2017-03-24 09:36:06 +01:00
drm_debugfs_crc.c Revert "drm: Don't allow interruptions when opening debugfs/crc" 2017-04-07 16:18:28 -04:00
drm_dma.c
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drm_dp_aux_dev.c
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drm_dp_dual_mode_helper.c drm: Add name for DRM_DP_DUAL_MODE_LSPCON 2017-02-23 11:06:12 -05:00
drm_dp_helper.c drm/dp: Add missing description to parameter 2017-03-07 16:38:16 -05:00
drm_dp_mst_topology.c drm/dp: Split drm_dp_mst_allocate_vcpi 2017-03-22 21:47:44 +01:00
drm_drv.c Linux 4.10-rc8 2017-02-23 12:10:12 +10:00
drm_dumb_buffers.c drm/kms-core: Use recommened kerneldoc for struct member refs 2017-01-25 16:30:34 +01:00
drm_edid.c Linux 4.11-rc3 2017-03-23 12:05:13 +10:00
drm_edid_load.c drm: move edid property update and add modes out of edid firmware loader 2017-02-21 15:41:24 +02:00
drm_encoder.c drm: Rename connector list iterator API 2017-02-28 16:16:48 +01:00
drm_encoder_slave.c drm/kms-core: Use recommened kerneldoc for struct member refs 2017-01-25 16:30:34 +01:00
drm_fb_cma_helper.c drm: Add mode_config .get_format_info() hook 2017-03-22 19:45:00 +02:00
drm_fb_helper.c drm/fb-helper: Extract _legacy kms functions 2017-04-06 10:23:06 +02:00
drm_file.c drm/gem: Add DEFINE_DRM_GEM_FOPS 2017-03-14 14:38:34 +01:00
drm_flip_work.c
…
drm_fourcc.c Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux into drm-misc-next 2017-03-23 08:15:55 +01:00
drm_framebuffer.c drm: extract legacy framebuffer remove 2017-04-06 10:22:43 +02:00
drm_gem.c drm: Introduce drm_gem_object_{get,put}() 2017-02-28 16:16:43 +01:00
drm_gem_cma_helper.c Pointer for Markus's image conversion work. 2017-03-14 15:07:33 +01:00
drm_global.c drm: Update TTM initialization documentation 2016-12-30 12:52:10 +01:00
drm_hashtab.c
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drm_info.c locking/atomic, kref: Add kref_read() 2017-01-14 11:37:18 +01:00
drm_internal.h drm/debugfs: Add kerneldoc 2017-03-24 09:36:06 +01:00
drm_ioc32.c drm: document drm_ioctl.[hc] 2017-04-04 20:47:54 +02:00
drm_ioctl.c drm: Pass CRTC ID in userspace vblank events 2017-04-04 20:59:12 +01:00
drm_irq.c drm: Pass CRTC ID in userspace vblank events 2017-04-04 20:59:12 +01:00
drm_kms_helper_common.c drm: Remove drmP.h include from drm_kms_helper_common.c 2017-03-09 16:18:02 +01:00
drm_legacy.h drm: compile drm_vm.c only when needed 2017-01-06 11:03:07 +01:00
drm_lock.c sched/headers: Prepare for new header dependencies before moving code to <linux/sched/signal.h> 2017-03-02 08:42:29 +01:00
drm_memory.c
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drm_mipi_dsi.c
…
drm_mm.c drm: Micro-optimise drm_mm_for_each_node_in_range() 2017-02-06 16:57:37 +01:00
drm_mode_config.c drm: Rename connector list iterator API 2017-02-28 16:16:48 +01:00
drm_mode_object.c Pointer for Markus's image conversion work. 2017-03-14 15:07:33 +01:00
drm_modes.c drm: Rename drm_mode_object_get() 2017-02-28 16:14:53 +01:00
drm_modeset_helper.c drm: Add mode_config .get_format_info() hook 2017-03-22 19:45:00 +02:00
drm_modeset_lock.c drm: Remove drm_modeset_legacy_acquire_ctx and crtc->acquire_ctx 2017-04-05 09:26:45 +02:00
drm_of.c drm: of: introduce drm_of_find_panel_or_bridge 2017-04-06 17:00:27 -04:00
drm_panel.c drm/panel: Constify device node argument to of_drm_find_panel() 2017-01-04 08:30:37 +01:00
drm_pci.c drm: Extract drm_pci.h 2017-03-09 16:18:02 +01:00
drm_plane.c drm: Only take cursor locks when the cursor plane exists 2017-04-07 13:28:32 -04:00
drm_plane_helper.c drm: Add acquire ctx parameter to ->set_config 2017-03-29 09:56:25 +02:00
drm_prime.c dma-buf: Rename dma-ops to prevent conflict with kunmap_atomic macro 2017-04-20 13:47:46 +05:30
drm_print.c drm: drm_printer: add __printf validation 2017-02-26 21:43:08 +01:00
drm_probe_helper.c drm/atomic: Acquire connection_mutex lock in drm_helper_probe_single_connector_modes, v4. 2017-04-06 21:29:23 +02:00
drm_property.c drm: Fix get_property logic fumble 2017-04-12 18:11:32 +02:00
drm_rect.c drm/rect: Fix formatting of example code 2016-12-30 13:35:54 +01:00
drm_scatter.c
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drm_scdc_helper.c drm/edid: detect SCDC support in HF-VSDB 2017-03-21 10:15:56 +02:00
drm_simple_kms_helper.c drm: Clarify the role of plane_state argument to drm_simple update(). 2017-03-30 12:02:00 -07:00
drm_sysfs.c drm: Consolidate and document sysfs support 2017-04-04 20:47:54 +02:00
drm_trace.h drm: Remove drm_pending_event->pid 2017-03-14 14:38:33 +01:00
drm_trace_points.c
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drm_vm.c drm: remove unnecessary fault wrappers 2017-02-24 17:46:55 -08:00
drm_vma_manager.c drm: Improve drm_mm search (and fix topdown allocation) with rbtrees 2017-02-03 11:10:32 +01:00