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1d7aaa0cfe
linux_dsm_epyc7002/drivers/gpu/drm/i915
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Daniel Vetter 1d7aaa0cfe drm/i915: detect wrong MCH watermark values 
Some early bios versions seem to ship with the wrong tuning values for
the MCH, possible resulting in pipe underruns under load. Especially
on DP outputs this can lead to black screen, since DP really doesn't
like an occasional whack from an underrun.

Unfortunately the registers seem to be locked after boot, so the only
thing we can do is politely point out issues and suggest a BIOS
upgrade.

Arthur Runyan pointed us at this issue while discussion DP bugs - thus
far no confirmation from a bug report yet that it helps. But at least
some of my machines here have wrong values, so this might be useful in
understanding bug reports.

v2: After a bit more discussion with Art and Ben we've decided to only
the check the watermark values, since the OREF ones could be be a
notch more aggressive on certain machines.

Cc: Ben Widawsky <ben@bwidawsk.net>
Cc: Runyan, Arthur J <arthur.j.runyan@intel.com>
Reviewed-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
2013-02-20 00:21:39 +01:00
..
dvo_ch7xxx.c drm/i915/dvo-ch7xxx: fix get_hw_state 2012-10-12 10:59:11 +02:00
dvo_ch7017.c drm/i915/dvo: implement get_hw_state 2012-09-06 07:58:52 +02:00
dvo_ivch.c drm/i915/dvo: implement get_hw_state 2012-09-06 07:58:52 +02:00
dvo_ns2501.c drm/i915/dvo: implement get_hw_state 2012-09-06 07:58:52 +02:00
dvo_sil164.c drm/i915/dvo: implement get_hw_state 2012-09-06 07:58:52 +02:00
dvo_tfp410.c drm/i915/dvo: implement get_hw_state 2012-09-06 07:58:52 +02:00
dvo.h Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux 2012-10-03 23:29:23 -07:00
i915_debugfs.c Merge branch 'fbcon-locking-fixes' of ssh://people.freedesktop.org/~airlied/linux into drm-next 2013-02-08 12:10:18 +10:00
i915_dma.c i915: ignore lid open event when resuming 2013-02-14 00:47:51 +01:00
i915_drv.c i915: ignore lid open event when resuming 2013-02-14 00:47:51 +01:00
i915_drv.h drm/i915: Fix gen2 mappable calculations 2013-02-15 10:30:38 +01:00
i915_gem_context.c drm/i915/ctx: Remove bad invariant 2013-02-15 10:30:40 +01:00
i915_gem_debug.c UAPI: (Scripted) Convert #include "..." to #include <path/...> in drivers/gpu/ 2012-10-02 18:01:07 +01:00
i915_gem_dmabuf.c Merge tag 'drm-intel-next-2012-12-21' of git://people.freedesktop.org/~danvet/drm-intel into drm-next 2013-01-17 20:34:08 +10:00
i915_gem_evict.c drm/i915: Create a gtt structure 2013-01-17 22:33:56 +01:00
i915_gem_execbuffer.c Merge branch 'fbcon-locking-fixes' of ssh://people.freedesktop.org/~airlied/linux into drm-next 2013-02-08 12:10:18 +10:00
i915_gem_gtt.c drm/i915: Fix gen2 mappable calculations 2013-02-15 10:30:38 +01:00
i915_gem_stolen.c drm/i915: remove intel_gtt structure 2013-01-31 11:50:07 +01:00
i915_gem_tiling.c drm/i915: Create a gtt structure 2013-01-17 22:33:56 +01:00
i915_gem.c drm/i915: Extract ring init from hw_init 2013-02-15 10:30:39 +01:00
i915_ioc32.c UAPI: (Scripted) Convert #include "..." to #include <path/...> in drivers/gpu/ 2012-10-02 18:01:07 +01:00
i915_irq.c drm/i915: add ibx_irq_postinstall 2013-02-15 10:30:38 +01:00
i915_reg.h drm/i915: detect wrong MCH watermark values 2013-02-20 00:21:39 +01:00
i915_suspend.c drm/i915: Introduce i915_vgacntrl_reg() 2013-01-31 11:50:12 +01:00
i915_sysfs.c drm/i915: fixup l3 parity sysfs access check 2012-12-05 19:10:20 +01:00
i915_trace_points.c drm/i915: [sparse] trivial sparse fixes 2012-04-18 10:34:49 +02:00
i915_trace.h drm/i915: Allow DRM_ROOT_ONLY|DRM_MASTER to submit privileged batchbuffers 2012-10-17 21:06:59 +02:00
i915_ums.c drm/i915: move DP save/restore into i915_ums.c 2013-01-31 11:50:04 +01:00
intel_acpi.c UAPI: (Scripted) Convert #include "..." to #include <path/...> in drivers/gpu/ 2012-10-02 18:01:07 +01:00
intel_bios.c Merge branch 'drm-next-3.8' of git://people.freedesktop.org/~agd5f/linux into drm-next 2012-12-10 20:03:58 +10:00
intel_bios.h UAPI: (Scripted) Convert #include "..." to #include <path/...> in drivers/gpu/ 2012-10-02 18:01:07 +01:00
intel_crt.c drm/i915: Always use adpa_reg 2013-01-26 17:29:52 +01:00
intel_ddi.c drm/i915: dynamic Haswell display power well support 2013-01-31 11:50:11 +01:00
intel_display.c Merge tag 'drm-intel-next-2013-02-01' of git://people.freedesktop.org/~danvet/drm-intel into drm-next 2013-02-08 11:08:10 +10:00
intel_dp.c drm/i915: unify HDMI/DP hpd definitions 2013-02-15 10:30:37 +01:00
intel_drv.h drm/i915: Only run idle processing from i915_gem_retire_requests_worker 2013-01-31 11:50:09 +01:00
intel_dvo.c Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux 2012-10-03 23:29:23 -07:00
intel_fb.c Merge tag 'drm-intel-next-2013-02-01' of git://people.freedesktop.org/~danvet/drm-intel into drm-next 2013-02-08 11:08:10 +10:00
intel_hdmi.c drm/i915: unify HDMI/DP hpd definitions 2013-02-15 10:30:37 +01:00
intel_i2c.c drm/i915: GPIO/GMBUS registers need an offset on VLV 2013-01-24 23:45:03 +01:00
intel_lvds.c i915: ignore lid open event when resuming 2013-02-14 00:47:51 +01:00
intel_modes.c drm/i915: Add "Automatic" mode for the "Broadcast RGB" property 2013-01-20 13:09:44 +01:00
intel_opregion.c GPU/i915: Fix acpi_bus_get_device() check in drivers/gpu/drm/i915/intel_opregion.c 2013-02-01 11:01:50 +01:00
intel_overlay.c Merge tag 'drm-intel-next-2013-02-01' of git://people.freedesktop.org/~danvet/drm-intel into drm-next 2013-02-08 11:08:10 +10:00
intel_panel.c drm/i915: write backlight harder 2013-02-15 10:30:36 +01:00
intel_pm.c drm/i915: detect wrong MCH watermark values 2013-02-20 00:21:39 +01:00
intel_ringbuffer.c Merge branch 'fbcon-locking-fixes' of ssh://people.freedesktop.org/~airlied/linux into drm-next 2013-02-08 12:10:18 +10:00
intel_ringbuffer.h Merge tag 'drm-intel-next-2012-12-21' of git://people.freedesktop.org/~danvet/drm-intel into drm-next 2013-01-17 20:34:08 +10:00
intel_sdvo_regs.h drm/i915: clear the entire sdvo infoframe buffer 2012-10-24 15:12:48 +02:00
intel_sdvo.c drm/i915: Provide the quantization range in the AVI infoframe 2013-01-20 13:09:45 +01:00
intel_sprite.c drm/i915: Fix sprite_scaling_enabled for multiple sprites 2013-02-15 10:30:37 +01:00
intel_tv.c drm/i915: Return the real error code from intel_set_mode() 2012-12-20 21:09:55 +01:00
Makefile drm/i915: extract ums suspend/resume into i915_ums.c 2013-01-31 11:50:03 +01:00