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linux/drivers/gpu/drm/i915
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Chris Wilson 7f58aabc36 drm/i915: Reset GMBUS controller after NAK 
Once a NAK has been asserted by the slave, we need to reset the GMBUS
controller in order to continue. This is done by asserting the Software
Clear Interrupt bit and then clearing it again to restore operations.

If we don't clear the NAK, then all future GMBUS xfers will fail,
including DDC probes and EDID retrieval.

v2: Add some comments as suggested by Keith Packard.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=35781
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Keith Packard <keithp@keithp.com>
Tested-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Tested-by: "Mengmeng Meng" <mengmeng.meng@intel.com>
2011-03-31 09:37:01 +01:00
..
dvo_ch7xxx.c drm/i915: use GMBUS to manage i2c links 2010-09-18 15:46:19 +01:00
dvo_ch7017.c drm/i915/dvo: Report LVDS attached to ch701x as connected 2010-12-30 13:50:43 +00:00
dvo_ivch.c drm/i915: use GMBUS to manage i2c links 2010-09-18 15:46:19 +01:00
dvo_sil164.c drm/i915: use GMBUS to manage i2c links 2010-09-18 15:46:19 +01:00
dvo_tfp410.c drm/i915: use GMBUS to manage i2c links 2010-09-18 15:46:19 +01:00
dvo.h drm/i915: Subclass intel_encoder. 2010-08-09 11:24:28 -07:00
i915_debugfs.c drm/i915: report correct render clock frequencies on SNB 2011-03-23 09:17:00 +00:00
i915_dma.c drm/i915: don't store the reg value for HWS_PGA 2011-03-02 09:40:14 +00:00
i915_drv.c Merge remote branch 'intel/drm-intel-next' of ../drm-next into drm-core-next 2011-03-14 14:15:13 +10:00
i915_drv.h Revert "drm/i915: Don't save/restore hardware status page address register" 2011-03-24 07:15:01 +00:00
i915_gem_debug.c drm/i915: Refine tracepoints 2011-02-07 14:59:18 +00:00
i915_gem_evict.c drm/i915: Refine tracepoints 2011-02-07 14:59:18 +00:00
i915_gem_execbuffer.c drm/i915: Disable pagefaults along execbuffer relocation fast path 2011-03-23 09:17:01 +00:00
i915_gem_gtt.c drm/i915,agp/intel: Do not clear stolen entries 2011-01-24 18:26:25 +00:00
i915_gem_tiling.c Merge branch 'drm-intel-fixes' into drm-intel-next 2011-03-07 12:35:15 +00:00
i915_gem.c drm/i915: Avoid unmapping pages from a NULL address space 2011-03-23 09:17:03 +00:00
i915_ioc32.c drm: convert drm_ioctl to unlocked_ioctl 2009-12-18 11:22:31 +10:00
i915_irq.c drm/i915: Replace vblank PM QoS with "Interrupt-Based AGPBUSY#" 2011-03-01 17:33:38 +00:00
i915_mem.c drm: Remove memory debugging infrastructure. 2009-06-18 13:00:33 -07:00
i915_reg.h Merge commit '5359533801e3dd3abca5b7d3d985b0b33fd9fe8b' into drm-core-next 2011-03-16 11:34:41 +10:00
i915_suspend.c Revert "drm/i915: Don't save/restore hardware status page address register" 2011-03-24 07:15:01 +00:00
i915_trace_points.c drm/i915: Add tracepoints 2009-09-23 01:05:21 +01:00
i915_trace.h drm/i915: Refine tracepoints 2011-02-07 14:59:18 +00:00
intel_acpi.c drm/i915: i915 cannot provide switcher services. 2010-12-08 15:40:44 +10:00
intel_bios.c Revert "drm/i915: Disable SSC for outputs other than LVDS or DP" 2011-02-22 15:55:28 +00:00
intel_bios.h Revert "drm/i915: Disable SSC for outputs other than LVDS or DP" 2011-02-22 15:55:28 +00:00
intel_crt.c drm/i915: cleanup per-pipe reg usage 2011-02-07 21:17:15 +00:00
intel_display.c drm/i915: report correct render clock frequencies on SNB 2011-03-23 09:17:00 +00:00
intel_dp.c drm/i915/dp: Correct the order of deletion for ghost eDP devices 2011-03-23 09:16:59 +00:00
intel_drv.h drm/i915: Busy-spin wait_for condition in atomic contexts 2011-03-31 09:31:12 +01:00
intel_dvo.c drm/i915: cleanup per-pipe reg usage 2011-02-07 21:17:15 +00:00
intel_fb.c Revert "drm: Update fbdev fb_fix_screeninfo" 2011-01-14 16:10:28 -08:00
intel_hdmi.c drm/i915: Add support for limited color range of broadcast outputs 2011-02-22 15:56:56 +00:00
intel_i2c.c drm/i915: Reset GMBUS controller after NAK 2011-03-31 09:37:01 +01:00
intel_lvds.c drm/i915/lvds: Always return connected in the absence of better information 2011-03-24 18:39:55 +00:00
intel_modes.c drm/i915: Add support for limited color range of broadcast outputs 2011-02-22 15:56:56 +00:00
intel_opregion.c drm/i915: Use a symbolic constant for OpRegion lid state 2011-02-24 18:13:42 +00:00
intel_overlay.c drm/i915: Use a device flag for non-interruptible phases 2011-02-22 15:56:25 +00:00
intel_panel.c Merge commit '5359533801e3dd3abca5b7d3d985b0b33fd9fe8b' into drm-core-next 2011-03-16 11:34:41 +10:00
intel_ringbuffer.c drm/i915: Restore missing command flush before interrupt on BLT ring 2011-03-23 09:17:01 +00:00
intel_ringbuffer.h Merge branch 'drm-intel-fixes' into drm-intel-next 2011-03-07 12:35:15 +00:00
intel_sdvo_regs.h drm/i915/sdvo: Add missing TV filters 2010-08-09 11:24:29 -07:00
intel_sdvo.c Merge remote branch 'intel/drm-intel-next' of ../drm-next into drm-core-next 2011-03-14 14:15:13 +10:00
intel_tv.c Merge branch 'drm-intel-fixes' into drm-intel-next 2011-02-16 09:44:30 +00:00
Makefile drm/i915: Split i915_gem_execbuffer into its own file. 2010-11-25 21:19:25 +00:00