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linux-pinenote/drivers/gpu/drm/i915
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Oscar Mateo 38cc46d73e drm/i915/bdw: Ack interrupts before handling them (GEN8) 
Otherwise, we might receive a new interrupt before we have time to
ack the first one, eventually missing it.

The right order should be:

1 - Disable Master Interrupt Control.
2 - Find the category of interrupt that is pending.
3 - Find the source(s) of the interrupt and clear the Interrupt Identity bits (IIR)
4 - Process the interrupt(s) that had bits set in the IIRs.
5 - Re-enable Master Interrupt Control.

Without an atomic XCHG operation with mmio space, the above merely reduces the window
in which we can miss an interrupt (especially when you consider how heavyweight the
I915_READ/I915_WRITE operations are).

Spotted by Bob Beckett <robert.beckett@intel.com>.

v2: Add warning to commit message and comments to the code as per Chris Wilson's request.

v3: Improve the source code comment.

Signed-off-by: Oscar Mateo <oscar.mateo@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
2014-06-18 00:49:18 +02:00
..
dvo.h
dvo_ch7xxx.c drm/i915: Remove spurious semicolons 2014-04-09 21:54:33 +02:00
dvo_ch7017.c
dvo_ivch.c drm/i915: Remove spurious semicolons 2014-04-09 21:54:33 +02:00
dvo_ns2501.c drm/i915: Remove spurious semicolons 2014-04-09 21:54:33 +02:00
dvo_sil164.c drm/i915: Remove spurious semicolons 2014-04-09 21:54:33 +02:00
dvo_tfp410.c drm/i915: Remove spurious semicolons 2014-04-09 21:54:33 +02:00
i915_cmd_parser.c drm/i915: Add some L3 registers to the parser whitelist 2014-06-18 00:48:35 +02:00
i915_debugfs.c drm/i915: Grab dev->struct_mutex in i915_gem_pageflip_info 2014-06-18 00:48:36 +02:00
i915_dma.c drm/i915: Replaced Blitter ring based flips with MMIO flips 2014-06-17 16:16:20 +02:00
i915_drv.c drm/i915: preserve user forcewake over system suspend/resume 2014-06-13 15:17:40 +02:00
i915_drv.h drm/i915: Replaced Blitter ring based flips with MMIO flips 2014-06-17 16:16:20 +02:00
i915_gem.c drm/i915: Don't BUG_ON in i915_gem_obj_offset 2014-06-18 00:48:37 +02:00
i915_gem_context.c drm/i915: Kill private_default_ctx off 2014-05-22 23:44:44 +02:00
i915_gem_debug.c drm/i915: prefer struct drm_i915_private to drm_i915_private_t 2014-03-31 15:34:21 +02:00
i915_gem_dmabuf.c drm/i915: Introduce mapping of user pages into video memory (userptr) ioctl 2014-05-16 19:31:29 +02:00
i915_gem_evict.c drm/i915: Prevent negative relocation deltas from wrapping 2014-05-27 11:18:40 +03:00
i915_gem_execbuffer.c drm/i915: Fix __user sparse warning 2014-06-13 17:45:29 +02:00
i915_gem_gtt.c drm/i915: Added write-enable pte bit supportt 2014-06-17 09:21:47 +02:00
i915_gem_gtt.h drm/i915: Added write-enable pte bit supportt 2014-06-17 09:21:47 +02:00
i915_gem_render_state.c drm/i915: Simplify processing of the golden render context state 2014-06-16 19:53:09 +02:00
i915_gem_stolen.c drm/i915: Use the .release hook to drop the stolen drm_mm tracking 2014-06-13 15:17:36 +02:00
i915_gem_tiling.c drm/i915: prefer struct drm_i915_private to drm_i915_private_t 2014-03-31 15:34:21 +02:00
i915_gem_userptr.c drm/i915: Introduce mapping of user pages into video memory (userptr) ioctl 2014-05-16 19:31:29 +02:00
i915_gpu_error.c drm/i915: Split the ringbuffers from the rings (2/3) 2014-05-22 23:27:25 +02:00
i915_ioc32.c drm: Remove DRM_ARRAY_SIZE() for ARRAY_SIZE() 2014-06-10 09:36:17 +10:00
i915_irq.c drm/i915/bdw: Ack interrupts before handling them (GEN8) 2014-06-18 00:49:18 +02:00
i915_params.c drm/i915: Replaced Blitter ring based flips with MMIO flips 2014-06-17 16:16:20 +02:00
i915_reg.h drm/i915: Add some L3 registers to the parser whitelist 2014-06-18 00:48:35 +02:00
i915_suspend.c drm/i915: disable GT power saving early during system suspend 2014-05-22 21:53:27 +02:00
i915_sysfs.c drm/i915: s/i915_hw_context/intel_context 2014-05-22 23:41:17 +02:00
i915_trace.h drm/i915: s/intel_ring_buffer/intel_engine_cs 2014-05-22 23:01:05 +02:00
i915_trace_points.c
i915_ums.c
intel_acpi.c
intel_bios.c Merge tag 'drm-intel-fixes-2014-06-06' of git://anongit.freedesktop.org/drm-intel into drm-next 2014-06-06 19:07:09 +10:00
intel_bios.h drm/i915: Detect if MIPI panel based on VBT and initialize only if present 2014-06-05 08:52:33 +02:00
intel_crt.c drm: convert crtc and connection_mutex to ww_mutex (v5) 2014-06-05 09:54:33 +10:00
intel_ddi.c drm/i915: update BDW DDI buffer translations 2014-06-16 19:57:05 +02:00
intel_display.c drm/i915: Replaced Blitter ring based flips with MMIO flips 2014-06-17 16:16:20 +02:00
intel_dp.c drm/i915: Add missing statics to recent psr functions 2014-06-17 10:46:21 +02:00
intel_drv.h drm/i915: Replaced Blitter ring based flips with MMIO flips 2014-06-17 16:16:20 +02:00
intel_dsi.c drm/i915: Fix memory leak in intel_dsi_init() error path 2014-06-13 22:08:15 +02:00
intel_dsi.h drm/i915: Add support for Generic MIPI panel driver 2014-06-05 08:52:32 +02:00
intel_dsi_cmd.c drm/i915: Send DPI command explicitely in LP mode 2014-04-09 21:54:30 +02:00
intel_dsi_cmd.h drm/i915: Send DPI command explicitely in LP mode 2014-04-09 21:54:30 +02:00
intel_dsi_panel_vbt.c drm/i915: Fix checkpatch errors 2014-06-11 16:57:33 +02:00
intel_dsi_pll.c
intel_dvo.c drm/i915: Don't get hw state from DVO chip unless DVO is enabled 2014-06-13 15:17:37 +02:00
intel_fbdev.c drm/i915: Use %c in a format string for the pipe name 2014-06-13 15:17:38 +02:00
intel_hdmi.c drm/i915/chv: Force clock buffer enables 2014-06-11 16:57:30 +02:00
intel_i2c.c drm/i915: Disable dp aux irq on g4x 2014-02-07 16:40:07 +01:00
intel_lvds.c drm/i915: replace drm_get_connector_name() with direct name field use 2014-06-04 13:14:37 +10:00
intel_modes.c
intel_opregion.c drm: convert crtc and connection_mutex to ww_mutex (v5) 2014-06-05 09:54:33 +10:00
intel_overlay.c Merge commit '9e9a928eed' into drm-next 2014-06-05 20:28:59 +10:00
intel_panel.c Merge commit '9e9a928eed' into drm-next 2014-06-05 20:28:59 +10:00
intel_pm.c drm/i915: Broaden FBC resolution limit to 4096*4096 2014-06-17 10:46:12 +02:00
intel_renderstate.h drm/i915: Simplify processing of the golden render context state 2014-06-16 19:53:09 +02:00
intel_renderstate_gen6.c drm/i915: Simplify processing of the golden render context state 2014-06-16 19:53:09 +02:00
intel_renderstate_gen7.c drm/i915: Simplify processing of the golden render context state 2014-06-16 19:53:09 +02:00
intel_renderstate_gen8.c drm/i915: Simplify processing of the golden render context state 2014-06-16 19:53:09 +02:00
intel_ringbuffer.c drm/i915: Added write-enable pte bit supportt 2014-06-17 09:21:47 +02:00
intel_ringbuffer.h drm/i915: s/i915_hw_context/intel_context 2014-05-22 23:41:17 +02:00
intel_sdvo.c drm/i915: replace drm_get_connector_name() with direct name field use 2014-06-04 13:14:37 +10:00
intel_sdvo_regs.h
intel_sideband.c drm/i915: vlv/chv: fix DSI sideband register accessing 2014-05-19 17:50:14 +02:00
intel_sprite.c drm/i915: PSR HSW: update after enabling sprite. 2014-06-13 17:45:28 +02:00
intel_tv.c drm: convert crtc and connection_mutex to ww_mutex (v5) 2014-06-05 09:54:33 +10:00
intel_uncore.c drm/i915: preserve user forcewake over system suspend/resume 2014-06-13 15:17:40 +02:00
Kconfig drm/i915: Introduce mapping of user pages into video memory (userptr) ioctl 2014-05-16 19:31:29 +02:00
Makefile drm/i915: Add support for Generic MIPI panel driver 2014-06-05 08:52:32 +02:00