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alistair23-linux/drivers/gpu/drm
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Michel Thierry dfc53c5e73 drm/i915: Consider HW CSB write pointer before resetting the sw read pointer 
A previous commit resets the Context Status Buffer (CSB) read pointer in
ring init
    commit c0a03a2e4c ("drm/i915: Reset CSB read pointer in ring init")

This is generally correct, but this pointer is not reset after
suspend/resume in some platforms (cht). In this case, the driver should
read the register value instead of resetting the sw read counter to 0.
Otherwise we process old events, leading to unwanted pre-emptions or
something worse.

But in other platforms (bdw) and also during GPU reset or power up, the
CSBWP is reset to 0x7 (an invalid number), and in this case the read
pointer should be set to 5 (the interrupt code will increment this
counter one more time, and will start reading from CSB[0]).

v2: When the CSB registers are reset, the read pointer needs to be set
to 5, otherwise the first write (CSB[0]) won't be read (Mika).
Replace magic numbers with GEN8_CSB_ENTRIES (6) and GEN8_CSB_PTR_MASK
(0x07).

Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Cc: stable@vger.kernel.org # v4.0+
Signed-off-by: Lei Shen <lei.shen@intel.com>
Signed-off-by: Deepak S <deepak.s@intel.com>
Signed-off-by: Michel Thierry <michel.thierry@intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
2015-09-28 17:23:19 +03:00
..
amd drm/amdgpu: Sprinkle drm_modeset_lock_all to appease locking checks 2015-09-23 17:23:46 -04:00
armada drm/armada: Use new drm_fb_helper functions 2015-08-06 14:12:56 +02:00
ast drm/ast: Don't grab dev->struct_mutex for in mmap offset ioctl 2015-08-10 13:36:55 +02:00
atmel-hlcdc Linux 4.2-rc8 2015-08-24 16:36:42 +10:00
bochs drm/bochs: Don't grab dev->struct_mutex for in mmap offset ioctl 2015-08-10 13:37:04 +02:00
bridge Merge branch 'drm-dwhdmi-devel' of git://ftp.arm.linux.org.uk/~rmk/linux-arm into drm-next 2015-08-27 13:01:57 +10:00
cirrus drm/cirrus: Don't grab dev->struct_mutex for in mmap offset ioctl 2015-08-10 13:37:27 +02:00
exynos media updates for v4.3-rc1 2015-09-11 16:42:39 -07:00
fsl-dcu drm/layerscape: fix handling fsl_dcu_drm_plane_index result 2015-09-24 08:13:09 +10:00
gma500 drm/gma500: Use new drm_fb_helper functions 2015-08-06 14:12:59 +02:00
i2c Merge remote-tracking branches 'asoc/topic/rcar', 'asoc/topic/reg-default', 'asoc/topic/rl6231', 'asoc/topic/rockchip' and 'asoc/topic/rt286' into asoc-next 2015-08-30 15:55:54 +01:00
i810
i915 drm/i915: Consider HW CSB write pointer before resetting the sw read pointer 2015-09-28 17:23:19 +03:00
imx Merge branch 'drm-dwhdmi-devel' of git://ftp.arm.linux.org.uk/~rmk/linux-arm into drm-next 2015-08-27 13:01:57 +10:00
mga
mgag200 drm/mgag200: Fix driver_load error handling 2015-09-24 08:10:44 +10:00
msm gpu/drm: Kill off set_irq_flags usage 2015-09-16 16:53:38 +02:00
nouveau Merge branch 'drm-fixes' of git://people.freedesktop.org/~airlied/linux 2015-09-11 09:35:56 -07:00
omapdrm drm/omap: Use new drm_fb_helper functions 2015-08-06 14:13:03 +02:00
panel drm/panel: Add support for LG LG4573 480x800 4.3" panel 2015-08-14 21:35:35 +02:00
qxl drm/qxl: only report first monitor as connected if we have no state 2015-09-24 08:08:17 +10:00
r128
radeon drm/radeon: add quirk for MSI R7 370 2015-09-23 17:23:47 -04:00
rcar-du drm/atomic: pass old crtc state to atomic_begin/flush. 2015-07-27 16:23:22 +02:00
rockchip drm/rockchip: vop: support plane scale 2015-08-26 14:16:26 +08:00
savage
shmobile drm: Simplify drm_for_each_legacy_plane arguments 2015-07-22 16:25:45 +02:00
sis
sti Merge branch 'drm-sti-next-atomic-2015-08-11' of http://git.linaro.org/people/benjamin.gaignard/kernel into drm-next 2015-08-14 10:14:23 +10:00
tdfx
tegra drm/tegra: Changes for v4.3-rc1 2015-08-17 15:52:39 +10:00
tilcdc drm/tilcdc: panel: make better use of gpiod API 2015-07-06 10:10:21 +02:00
ttm drm/ttm: Fix memory space allocation v2 2015-09-15 00:57:01 -07:00
udl drm/udl: Use new drm_fb_helper functions 2015-08-06 14:13:00 +02:00
vgem mm: mark most vm_operations_struct const 2015-09-10 13:29:01 -07:00
via treewide: fix typos in comment blocks 2015-08-07 14:46:24 +02:00
virtio drm/virtio: Use new drm_fb_helper functions 2015-08-06 14:13:07 +02:00
vmwgfx Merge tag 'vmwgfx-fixes-4.3-150924' of git://people.freedesktop.org/~thomash/linux into drm-fixes 2015-09-24 18:36:04 +10:00
ati_pcigart.c
drm_agpsupport.c
drm_atomic.c drm/atomic: Fix bookkeeping with TEST_ONLY, v3. 2015-09-01 11:57:06 +03:00
drm_atomic_helper.c Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux 2015-09-04 15:49:32 -07:00
drm_auth.c
drm_bridge.c
drm_bufs.c
drm_cache.c drm: Avoid the double clflush on the last cache line in drm_clflush_virt_range() 2015-06-19 17:25:17 +02:00
drm_context.c drm: Convert drm_legacy_ctxbitmap_init to void return type 2015-07-02 17:00:48 +02:00
drm_crtc.c Linux 4.2-rc7 2015-08-17 14:13:53 +10:00
drm_crtc_helper.c drm: Make the connector dpms callback return a value, v2. 2015-07-27 16:23:28 +02:00
drm_crtc_internal.h
drm_debugfs.c
drm_dma.c
drm_dp_helper.c drm/dp: Add dp_aux_i2c_speed_khz module param to set the assume i2c bus speed 2015-09-02 16:13:43 +03:00
drm_dp_mst_topology.c Linux 4.2-rc8 2015-08-24 16:36:42 +10:00
drm_drv.c Merge tag 'topic/connector-locking-2015-07-23' of git://anongit.freedesktop.org/drm-intel into drm-next 2015-07-24 14:30:29 +10:00
drm_edid.c drm/edid: Use ARRAY_SIZE in drm_add_modes_noedid 2015-08-11 12:04:16 +02:00
drm_edid_load.c
drm_encoder_slave.c
drm_fb_cma_helper.c drm/fb_cma_helper: Use new drm_fb_helper functions 2015-08-06 14:13:00 +02:00
drm_fb_helper.c drm/core: Set mode to NULL when connectors in a set drops to 0. 2015-08-11 12:04:19 +02:00
drm_flip_work.c
drm_fops.c drm/mode: Add user blob-creation ioctl 2015-05-22 16:18:28 +02:00
drm_gem.c drm/gem: Be more friendly with locking checks 2015-08-10 13:35:49 +02:00
drm_gem_cma_helper.c drm/cma-helper: Don't grab dev->struct_mutex for in mmap offset ioctl 2015-08-10 13:37:36 +02:00
drm_global.c
drm_hashtab.c
drm_info.c
drm_internal.h
drm_ioc32.c Merge tag 'topic/drm-misc-2015-07-23' of git://anongit.freedesktop.org/drm-intel into drm-next 2015-07-24 14:28:16 +10:00
drm_ioctl.c drm: Allow also control clients to check the drm version 2015-09-24 00:24:24 -07:00
drm_irq.c Linux 4.2-rc7 2015-08-17 14:13:53 +10:00
drm_legacy.h drm: Convert drm_legacy_ctxbitmap_init to void return type 2015-07-02 17:00:48 +02:00
drm_lock.c drm: Reject DRI1 hw lock ioctl functions for kms drivers 2015-07-02 17:00:48 +02:00
drm_memory.c
drm_mipi_dsi.c
drm_mm.c drm: clean up drm_mm debugfs output 2015-05-29 09:17:57 +10:00
drm_modes.c drm/mode: Unstatic kernel-userspace mode conversion 2015-05-22 16:18:21 +02:00
drm_modeset_lock.c drm: Remove __drm_modeset_lock_all 2015-08-06 14:13:02 +02:00
drm_of.c drm: Add modeset object iterators 2015-07-22 16:25:45 +02:00
drm_panel.c
drm_pci.c
drm_plane_helper.c drm/atomic: pass old crtc state to atomic_begin/flush. 2015-07-27 16:23:22 +02:00
drm_platform.c
drm_prime.c drm: prime: Document gem_prime_mmap 2015-06-19 17:50:05 +02:00
drm_probe_helper.c drm/probe-helper: Grab mode_config.mutex in poll_init/enable 2015-07-22 16:25:45 +02:00
drm_rect.c
drm_scatter.c
drm_sysfs.c Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux 2015-06-26 13:18:51 -07:00
drm_trace.h
drm_trace_points.c
drm_vm.c
drm_vma_manager.c
Kconfig Merge branch 'drm-next-fsl-dcu' of https://github.com/Jianwei-Wang/linux-drm-fsl-dcu into drm-next 2015-08-20 14:11:17 +10:00
Makefile drm/layerscape: Add Freescale DCU DRM driver 2015-08-19 22:23:04 -04:00