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f6a1906674
linux_dsm_epyc7002/drivers/gpu/drm/i915
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Ville Syrjälä f6a1906674 drm/i915: Do a dummy DPCD read before the actual read 
Sometimes we seem to get utter garbage from DPCD reads. The resulting
buffer is filled with the same byte, and the operation completed without
errors. My HP ZR24w monitor seems particularly susceptible to this
problem once it's gone into a sleep mode.

The issue seems to happen only for the first AUX message that wakes the
sink up. But as the first AUX read we often do is the DPCD receiver
cap it does wreak a bit of havoc with subsequent link training etc. when
the receiver cap bw/lane/etc. information is garbage.

A sufficient workaround seems to be to perform a single byte dummy read
before reading the actual data. I suppose that just wakes up the sink
sufficiently and we can just throw away the returned data in case it's
crap. DP_DPCD_REV seems like a sufficiently safe location to read here.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Todd Previte <tprevite@gmail.com>
Cc: stable@vger.kernel.org
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
2014-10-27 13:37:12 +02:00
..
dvo_ch7xxx.c
dvo_ch7017.c
dvo_ivch.c
dvo_ns2501.c drm/i915: Check pixel clock in ns2501 mode_valid hook 2014-09-03 11:05:21 +02:00
dvo_sil164.c
dvo_tfp410.c
dvo.h
i915_cmd_parser.c Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux 2014-10-14 09:39:08 +02:00
i915_debugfs.c drm/i915: Objects on the unbound list may still have an active reference 2014-09-19 14:41:14 +02:00
i915_dma.c Merge tag 'drm-intel-next-2014-09-05' of git://anongit.freedesktop.org/drm-intel into drm-next 2014-09-16 16:02:09 +10:00
i915_drv.c drm/i915: Don't reinit hpd interrupts after gpu reset 2014-09-19 14:41:16 +02:00
i915_drv.h Merge tag 'drm-intel-next-fixes-2014-10-03' of git://anongit.freedesktop.org/drm-intel into drm-next 2014-10-07 14:30:02 +10:00
i915_gem_context.c drm/i915/bdw: Apply workarounds in render ring init function 2014-09-03 11:04:42 +02:00
i915_gem_debug.c
i915_gem_dmabuf.c dma-buf: use reservation objects 2014-07-08 13:03:20 -07:00
i915_gem_evict.c drm/i915: fix another use-after-free in i915_gem_evict_everything 2014-09-19 14:41:16 +02:00
i915_gem_execbuffer.c drm/i915: Only track real ppgtt for a context 2014-08-13 14:23:33 +02:00
i915_gem_gtt.c Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux 2014-10-14 09:39:08 +02:00
i915_gem_gtt.h drm/i915: Rework GPU reset sequence to match driver load & thaw 2014-09-03 10:54:09 +02:00
i915_gem_render_state.c drm/i915/bdw: Render state init for Execlists 2014-09-03 11:04:52 +02:00
i915_gem_render_state.h drm/i915/bdw: Render state init for Execlists 2014-09-03 11:04:52 +02:00
i915_gem_stolen.c drm/i915: Extend BIOS stolen mem handling to all platform 2014-09-19 14:41:19 +02:00
i915_gem_tiling.c drm/i915/bdw: Let the memory controller do all the swizzling 2014-09-03 11:04:33 +02:00
i915_gem_userptr.c drm/i915: Do not leak pages when freeing userptr objects 2014-09-29 15:31:01 +02:00
i915_gem.c drm/i915: Match GTT space sanity checker with implementation 2014-09-19 14:41:18 +02:00
i915_gpu_error.c drm/i915: Differentiate between LLC or snooped for the user 2014-09-03 11:04:25 +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: fix short vs. long hpd detection 2014-10-16 15:00:28 +03:00
i915_params.c Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux 2014-10-14 09:39:08 +02:00
i915_reg.h drm/i915: Enable pixel replicated modes on BDW and HSW. 2014-10-01 10:01:41 +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: Differentiate between LLC or snooped for the user 2014-09-03 11:04:25 +02:00
i915_trace_points.c
i915_trace.h drm/i915: s/intel_ring_buffer/intel_engine_cs 2014-05-22 23:01:05 +02:00
i915_ums.c
intel_acpi.c
intel_bios.c Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux 2014-10-14 09:39:08 +02:00
intel_bios.h drm/i915: Add support for Video Burst Mode for MIPI DSI 2014-08-08 17:43:45 +02:00
intel_crt.c drm/i915: Remove bogus __init annotation from DMI callbacks 2014-08-28 09:54:27 +03:00
intel_ddi.c drm/i915: Rewrite ABS_DIFF() in a safer manner 2014-09-04 15:08:53 +02:00
intel_display.c drm/i915: Don't trust the DP_DETECT bit for eDP ports on CHV 2014-10-16 14:58:44 +03:00
intel_dp_mst.c drm/i915: fix build without fbdev. 2014-07-22 20:11:29 +10:00
intel_dp.c drm/i915: Do a dummy DPCD read before the actual read 2014-10-27 13:37:12 +02:00
intel_drv.h drm/i915: Move DIV_ROUND_CLOSEST_ULL macro to header 2014-10-06 16:49:27 +02:00
intel_dsi_cmd.c drm/i915: Align intel_dsi*.c files a bit 2014-08-08 17:43:45 +02:00
intel_dsi_cmd.h drm/i915: wait for all DSI FIFOs to be empty 2014-08-07 11:07:15 +02:00
intel_dsi_panel_vbt.c drm/i915: Add support for Video Burst Mode for MIPI DSI 2014-08-08 17:43:45 +02:00
intel_dsi_pll.c drm/i915: Align intel_dsi*.c files a bit 2014-08-08 17:43:45 +02:00
intel_dsi.c drm/i915: Align intel_dsi*.c files a bit 2014-08-08 17:43:45 +02:00
intel_dsi.h drm/i915: Add support for Video Burst Mode for MIPI DSI 2014-08-08 17:43:45 +02:00
intel_dvo.c drm/i915: Don't call DVO mode_set hook on DPMS changes 2014-09-03 11:05:14 +02:00
intel_fbdev.c drm/i915: make fbdev initialization asynchronous v2 2014-09-03 11:05:01 +02:00
intel_hdmi.c Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux 2014-10-14 09:39:08 +02:00
intel_i2c.c drm/i915: Kill duplicated cdclk readout code from i2c 2014-07-07 11:27:52 +02:00
intel_lrc.c drm/i915: add cherryview specfic forcewake in execlists_elsp_write 2014-09-19 14:41:17 +02:00
intel_lrc.h drm/i915/bdw: Render state init for Execlists 2014-09-03 11:04:52 +02:00
intel_lvds.c Linux 3.17-rc5 2014-09-16 11:38:04 +10:00
intel_modes.c
intel_opregion.c ACPI / i915: Update the condition to ignore firmware backlight change request 2014-09-30 01:11:18 +02:00
intel_overlay.c drm/i915: use helpers 2014-07-18 14:25:15 +10:00
intel_panel.c drm/i915: Move DIV_ROUND_CLOSEST_ULL macro to header 2014-10-06 16:49:27 +02:00
intel_pm.c drm/i915: Don't spam dmesg with rps messages on vlv/chv 2014-09-29 16:53:36 +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_renderstate.h drm/i915/bdw: Render state init for Execlists 2014-09-03 11:04:52 +02:00
intel_ringbuffer.c Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux 2014-10-14 09:39:08 +02:00
intel_ringbuffer.h drm/i915/bdw: Apply workarounds in render ring init function 2014-09-03 11:04:42 +02:00
intel_sdvo_regs.h
intel_sdvo.c Merge tag 'topic/core-stuff-2014-06-30' of git://anongit.freedesktop.org/drm-intel into drm-next 2014-07-08 11:04:35 +10:00
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: init sprites with univeral plane init function 2014-09-03 15:43:47 +02:00
intel_tv.c drm/i915: Wait for vblank before enabling the TV encoder 2014-09-08 18:07:08 +03:00
intel_uncore.c drm/i915: Use IS_BROADWELL() instead of IS_GEN8() in forcewake code 2014-09-03 15:14:32 +02:00
Kconfig drm/i915: Ditch UMS config option 2014-07-24 10:59:53 +02:00
Makefile drm/i915/bdw: New source and header file for LRs, LRCs and Execlists 2014-08-11 16:00:07 +02:00