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linux/drivers/gpu/drm/i915
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Ville Syrjälä e95a2f7509 drm/i915: Increase WM memory latency values on SNB 
On SNB the BIOS provided WM memory latency values seem insufficient to
handle high resolution displays.

In this particular case the display mode was a 2560x1440@60Hz, which
makes the pixel clock 241.5 MHz. It was empirically found that a memory
latency value if 1.2 usec is enough to avoid underruns, whereas the BIOS
provided value of 0.7 usec was clearly too low. Incidentally 1.2 usec
is what the typical BIOS provided values are on IVB systems.

Increase the WM memory latency values to at least 1.2 usec on SNB.
Hopefully this won't have a significant effect on power consumption.

v2: Increase the latency values regardless of the pixel clock

Cc: Robert N <crshman@gmail.com>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=70254
Tested-by: Robert Navarro <crshman@gmail.com>
Tested-by: Vitaly Minko <vitaly.minko@gmail.com>
Cc: stable@vger.kernel.org
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
2014-05-15 14:10:11 +03:00
..
dvo_ch7xxx.c drm/i915: Replace DRM_LOG_KMS() by DRM_DEBUG_KMS() 2014-03-28 12:57:10 +10:00
dvo_ch7017.c
dvo_ivch.c drm/i915: Replace DRM_LOG_KMS() by DRM_DEBUG_KMS() 2014-03-28 12:57:10 +10:00
dvo_ns2501.c drm/i915: Replace DRM_LOG_KMS() by DRM_DEBUG_KMS() 2014-03-28 12:57:10 +10:00
dvo_sil164.c drm/i915: Replace DRM_LOG_KMS() by DRM_DEBUG_KMS() 2014-03-28 12:57:10 +10:00
dvo_tfp410.c drm/i915: Replace DRM_LOG_KMS() by DRM_DEBUG_KMS() 2014-03-28 12:57:10 +10:00
dvo.h drm/i915: Remove unused mode_fixup() vfunc of struct intel_dvo_dev_ops 2013-09-05 21:39:59 +02:00
i915_cmd_parser.c Merge tag 'drm-intel-next-2014-03-21' of git://anongit.freedesktop.org/drm-intel into drm-next 2014-04-03 07:51:54 +10:00
i915_debugfs.c Merge tag 'drm-intel-fixes-2014-04-04' of git://anongit.freedesktop.org/drm-intel into drm-next 2014-04-05 16:14:21 +10:00
i915_dma.c drm/i915/dma: prefer struct drm_i915_private to drm_i915_private_t 2014-03-31 15:32:32 +02:00
i915_drv.c drm/i915: move power domain init earlier during system resume 2014-04-04 09:30:10 +02:00
i915_drv.h drm/i915: don't try DP_LINK_BW_5_4 on HSW ULX 2014-04-30 09:46:51 +03:00
i915_gem_context.c drm/i915: Always use kref tracking for all contexts. 2014-04-11 13:29:51 +03:00
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: Pin pages whilst allocating for dma-buf vmap() 2013-11-29 15:51:20 +01:00
i915_gem_evict.c drm/i915: prefer struct drm_i915_private to drm_i915_private_t 2014-03-31 15:34:21 +02:00
i915_gem_execbuffer.c drm/i915: Always use kref tracking for all contexts. 2014-04-11 13:29:51 +03:00
i915_gem_gtt.c drm/i915: Sanitize the enable_ppgtt module option once 2014-04-29 18:46:09 +03:00
i915_gem_stolen.c drm/i915: restrict vt-d stolen memory workaround to pre-gen8 2014-03-31 10:45:34 +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.c drm/i915: Always use kref tracking for all contexts. 2014-04-11 13:29:51 +03:00
i915_gpu_error.c drm/i915: prefer struct drm_i915_private to drm_i915_private_t 2014-03-31 15:34:21 +02:00
i915_ioc32.c
i915_irq.c drm/i915: Don't WARN nor handle unexpected hpd interrupts on gmch platforms 2014-04-25 16:01:14 +03:00
i915_params.c drm/i915: make PC8 be part of runtime PM suspend/resume 2014-03-19 16:38:25 +01:00
i915_reg.h drm/i915: Move all ring resets before setting the HWS page 2014-04-25 16:01:14 +03:00
i915_suspend.c drm/i915: Kill most of the FBC register save/restore 2014-01-25 21:17:03 +01:00
i915_sysfs.c drm/i915: remove rps local variables 2014-03-20 14:46:07 +01:00
i915_trace_points.c
i915_trace.h drm/i915: Do not dereference pointers from ring buffer in evict event 2014-03-19 08:17:29 +01:00
i915_ums.c drm/i915: Only restore backlight combination mode reg for ums 2014-01-24 17:22:45 +01:00
intel_acpi.c Merge branch 'acpi-dsm' 2014-01-12 23:45:52 +01:00
intel_bios.c drm/i915: clean up VBT eDP link param decoding 2014-05-07 15:01:49 +03:00
intel_bios.h drm/i915: check VBT for supported backlight type 2014-04-11 13:22:27 +03:00
intel_crt.c Skip intel_crt_init for Dell XPS 8700 2014-04-04 09:30:53 +02:00
intel_ddi.c drm/i915: fix WARNs when reading DDI state while suspended 2014-04-01 22:53:45 +02:00
intel_display.c drm/i915: Break encoder->crtc link separately in intel_sanitize_crtc() 2014-04-25 16:07:11 +03:00
intel_dp.c drm/i915/dp: force eDP lane count to max available lanes on BDW 2014-05-15 11:04:21 +03:00
intel_drv.h drm/i915: Don't check gmch state on inherited configs 2014-04-23 10:41:01 +03:00
intel_dsi_cmd.c drm/i915/dsi: s/size_t/int/ 2013-09-04 17:34:51 +02:00
intel_dsi_cmd.h drm/i915/dsi: s/size_t/int/ 2013-09-04 17:34:51 +02:00
intel_dsi_pll.c drm/i915: Try harder to get best m, n, p values with minimal error 2013-12-11 23:52:18 +01:00
intel_dsi.c drm/i915: Make encoder cloning more flexible 2014-03-10 21:33:26 +01:00
intel_dsi.h drm/i915: Parametrize the dphy and other spec specific parameters 2013-12-11 23:52:20 +01:00
intel_dvo.c drm/i915: Make encoder cloning more flexible 2014-03-10 21:33:26 +01:00
intel_fbdev.c drm/i915: Use the first mode if there is no preferred mode in the EDID 2014-05-15 11:32:35 +03:00
intel_hdmi.c drm/i915: Allow user modes to exceed DVI 165MHz limit 2014-04-22 14:33:26 +03:00
intel_i2c.c drm/i915: Disable dp aux irq on g4x 2014-02-07 16:40:07 +01:00
intel_lvds.c Merge tag 'drm-intel-next-2014-03-21' of git://anongit.freedesktop.org/drm-intel into drm-next 2014-04-03 07:51:54 +10:00
intel_modes.c
intel_opregion.c Merge tag 'drm-intel-fixes-2014-02-06' of ssh://git.freedesktop.org/git/drm-intel into drm-next 2014-02-11 12:57:27 +10:00
intel_overlay.c Merge tag 'drm-intel-fixes-2014-04-04' of git://anongit.freedesktop.org/drm-intel into drm-next 2014-04-05 16:14:21 +10:00
intel_panel.c drm/i915: restore backlight precision when converting from ACPI 2014-05-15 11:32:51 +03:00
intel_pm.c drm/i915: Increase WM memory latency values on SNB 2014-05-15 14:10:11 +03:00
intel_ringbuffer.c drm/i915: Move all ring resets before setting the HWS page 2014-04-25 16:01:14 +03:00
intel_ringbuffer.h drm/i915: Move all ring resets before setting the HWS page 2014-04-25 16:01:14 +03:00
intel_sdvo_regs.h drm/i915: use __packed instead of __attribute__((packed)) 2013-12-03 18:19:49 +01:00
intel_sdvo.c drm/i915/SDVO: For sysfs link put directory and target in correct order 2014-05-07 15:01:50 +03:00
intel_sideband.c drm/i915: Use FLISDSI interface for band gap reset 2013-12-11 23:52:17 +01:00
intel_sprite.c drm/i915: Shuffle sprite register writes into a tighter group 2014-01-24 17:22:53 +01:00
intel_tv.c drm/i915/tv: fix gen4 composite s-video tv-out 2014-03-28 18:33:16 +01:00
intel_uncore.c drm/i915/vlv: reset VLV media force wake request register 2014-05-09 21:47:26 +03:00
Kconfig ACPI / gpu / drm: Stop selecting VIDEO_OUTPUT_CONTROL 2014-03-20 02:37:22 +01:00
Makefile Merge remote-tracking branch 'airlied/drm-next' into drm-intel-next 2014-03-18 09:43:56 +01:00