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9b18572e83
linux/drivers/gpu/drm
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Mika Kuoppala 9b18572e83 drm/i915/gen9: Verify and enforce dc6 state writes 
It has been observed that sometimes disabling the dc6 fails
and dc6 state pops back up, brief moment after disabling. This
has to be dmc save/restore timing issue or other bug in the
way dc states are handled.

Try to work around this issue as we don't have firmware fix
yet available. Verify that the value we wrote for the dmc sticks,
and also enforce it by rewriting it, if it didn't.

v2: Zero rereads on rewrite for extra paranoia (Imre)

Testcase: kms_flip/basic-flip-vs-dpms
References: https://bugs.freedesktop.org/show_bug.cgi?id=93768
Cc: Patrik Jakobsson <patrik.jakobsson@linux.intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Imre Deak <imre.deak@intel.com>
Signed-off-by: Mika Kuoppala <mika.kuoppala@intel.com>
Reviewed-by: Imre Deak <imre.deak@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1455811089-27884-1-git-send-email-mika.kuoppala@intel.com
(cherry picked from commit 779cb5d3dd)
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
2016-02-22 18:37:43 +02:00
..
amd drm/amdgpu: use post-decrement in error handling 2016-02-16 10:05:38 -05:00
armada Merge branch 'drm-armada-devel' of git://ftp.arm.linux.org.uk/~rmk/linux-arm into drm-next 2015-12-23 09:19:58 +10:00
ast
atmel-hlcdc
bochs
bridge Merge tag 'topic/drm-misc-2016-01-17' of git://anongit.freedesktop.org/drm-intel into drm-next 2016-01-18 07:01:16 +10:00
cirrus
etnaviv drm/etnaviv: call correct function when trying to vmap a DMABUF 2016-01-26 18:54:01 +01:00
exynos drm/exynos/decon: fix disable clocks order 2016-02-15 23:25:23 +09:00
fsl-dcu
gma500 Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux 2016-01-17 13:40:25 -08:00
i2c drm: adv7511: it's HPD, not HDP 2016-02-02 15:37:55 +01:00
i810
i915 drm/i915/gen9: Verify and enforce dc6 state writes 2016-02-22 18:37:43 +02:00
imx dma-mapping: always provide the dma_map_ops based implementation 2016-01-20 17:09:18 -08:00
mga
mgag200 asm-generic changes for 4.5 2016-01-20 17:30:20 -08:00
msm Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux 2016-01-17 13:40:25 -08:00
nouveau drm/nouveau: use post-decrement in error handling 2016-02-19 13:36:05 +10:00
omapdrm fbdev changes for 4.5 2016-01-18 11:58:31 -08:00
panel
qxl drm/qxl: fix erroneous return value 2016-02-17 15:39:35 +10:00
r128
radeon Merge branch 'drm-fixes-4.5' of git://people.freedesktop.org/~agd5f/linux into drm-fixes 2016-02-19 12:49:03 +10:00
rcar-du dma-mapping: always provide the dma_map_ops based implementation 2016-01-20 17:09:18 -08:00
rockchip drm/rockchip: respect CONFIG_DRM_FBDEV_EMULATION 2016-01-22 08:45:31 +08:00
savage
shmobile dma-mapping: always provide the dma_map_ops based implementation 2016-01-20 17:09:18 -08:00
sis
sti dma-mapping: always provide the dma_map_ops based implementation 2016-01-20 17:09:18 -08:00
tdfx
tegra Merge tag 'topic/drm-misc-2016-01-17' of git://anongit.freedesktop.org/drm-intel into drm-next 2016-01-18 07:01:16 +10:00
tilcdc dma-mapping: always provide the dma_map_ops based implementation 2016-01-20 17:09:18 -08:00
ttm Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux 2016-01-17 13:40:25 -08:00
udl
vc4 drm/vc4: Use runtime PM to power cycle the device when the GPU hangs. 2016-02-16 12:21:01 -08:00
vgem
via
virtio virtio: barrier rework+fixes 2016-01-18 16:44:24 -08:00
vmwgfx drm/vmwgfx: respect 'nomodeset' 2016-01-29 10:03:44 +10:00
ati_pcigart.c
drm_agpsupport.c
drm_atomic_helper.c drm/atomic: Allow for holes in connector state, v2. 2016-02-19 13:24:03 +10:00
drm_atomic.c drm/atomic: Allow for holes in connector state, v2. 2016-02-19 13:24:03 +10:00
drm_auth.c
drm_bridge.c
drm_bufs.c
drm_cache.c
drm_context.c
drm_crtc_helper.c
drm_crtc_internal.h
drm_crtc.c drm/atomic: Allow for holes in connector state, v2. 2016-02-19 13:24:03 +10:00
drm_debugfs.c
drm_dma.c
drm_dp_helper.c
drm_dp_mst_topology.c Revert "drm/dp/mst: change MST detection scheme" 2016-02-17 14:07:48 +10:00
drm_drv.c drm: move MODULE_PARM_DESC to other file 2016-01-08 15:32:29 +01:00
drm_edid_load.c
drm_edid.c drm/edid: index CEA/HDMI mode tables using the VIC 2016-01-08 15:30:28 +01:00
drm_encoder_slave.c
drm_fb_cma_helper.c drm/fb_cma_helper: Remove implicit call to disable_unused_functions 2016-01-15 11:16:15 +01:00
drm_fb_helper.c
drm_flip_work.c
drm_fops.c
drm_gem_cma_helper.c
drm_gem.c drm: Remove opencoded drm_gem_object_release_handle() 2016-01-05 16:23:09 +01:00
drm_global.c
drm_hashtab.c tree wide: use kvfree() than conditional kfree()/vfree() 2016-01-22 17:02:18 -08:00
drm_info.c
drm_internal.h
drm_ioc32.c
drm_ioctl.c
drm_irq.c drm: Fix treatment of drm_vblank_offdelay in drm_vblank_on() (v2) 2016-02-17 14:19:00 +10:00
drm_legacy.h
drm_lock.c
drm_memory.c
drm_mipi_dsi.c
drm_mm.c
drm_modes.c
drm_modeset_lock.c
drm_of.c
drm_panel.c
drm_pci.c
drm_plane_helper.c
drm_platform.c
drm_prime.c
drm_probe_helper.c Merge branch 'for-linus' into for-next 2015-12-23 08:33:34 +01:00
drm_rect.c
drm_scatter.c
drm_sysfs.c drm/sysfs: use kobj_to_dev() 2016-01-13 16:43:07 +01:00
drm_trace_points.c
drm_trace.h
drm_vm.c
drm_vma_manager.c
Kconfig dma-mapping: always provide the dma_map_ops based implementation 2016-01-20 17:09:18 -08:00
Makefile Merge branch 'kbuild' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild 2016-01-20 09:45:43 -08:00