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linux-hardened/drivers/gpu/drm/i915
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Jani Nikula cac6a5ae01 drm/i915: try not to lose backlight CBLV precision 
ACPI has _BCM and _BQC methods to set and query the backlight
brightness, respectively. The ACPI opregion has variables BCLP and CBLV
to hold the requested and current backlight brightness, respectively.

The BCLP variable has range 0..255 while the others have range
0..100. This means the _BCM method has to scale the brightness for BCLP,
and the gfx driver has to scale the requested value back for CBLV. If
the _BQC method uses the CBLV variable (apparently some implementations
do, some don't) for current backlight level reporting, there's room for
rounding errors.

Use DIV_ROUND_UP for scaling back to CBLV to get back to the same values
that were passed to _BCM, presuming the _BCM simply uses bclp = (in *
255) / 100 for scaling to BCLP.

Reference: https://gist.github.com/aaronlu/6314920
Reported-by: Aaron Lu <aaron.lu@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Aaron Lu <aaron.lu@intel.com>
Cc: stable@vger.kernel.org
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
2013-09-06 09:41:20 +02:00
..
dvo.h
dvo_ch7xxx.c drm/i915: dvo_ch7xxx: fix vsync polarity setting 2013-07-25 16:10:22 +02:00
dvo_ch7017.c
dvo_ivch.c
dvo_ns2501.c
dvo_sil164.c
dvo_tfp410.c
i915_debugfs.c drm/i915: Report requested frequency alongside current frequency in debugfs 2013-09-03 11:12:28 +02:00
i915_dma.c i915: Update VGA arbiter support for newer devices 2013-09-03 19:17:59 +02:00
i915_drv.c drm/i915: split PCI IDs out into i915_drm.h v4 2013-09-03 19:17:56 +02:00
i915_drv.h drm/i915: fix hpd work vs. flush_work in the pageflip code deadlock 2013-09-04 17:34:02 +02:00
i915_gem.c drm/i915: Hold an object reference whilst we shrink it 2013-09-05 14:47:59 +02:00
i915_gem_context.c drm/i915: mm_list is per VMA 2013-08-08 14:06:58 +02:00
i915_gem_debug.c drm/i915: Fix #endif comment 2013-08-09 10:45:52 +02:00
i915_gem_dmabuf.c drm/i915: Pin pages whilst mapping the dma-buf 2013-09-03 19:17:58 +02:00
i915_gem_evict.c drm/i915/vma: Correct use after free in eviction 2013-08-23 14:52:21 +02:00
i915_gem_execbuffer.c drm/i915: fix up the relocate_entry refactoring 2013-09-03 19:18:01 +02:00
i915_gem_gtt.c drm/i915: Use Write-Through cacheing for the display plane on Iris 2013-08-22 13:31:38 +02:00
i915_gem_stolen.c drm/i915: Skip stolen region initialisation if none is reserved 2013-09-05 14:49:50 +02:00
i915_gem_tiling.c drm/i915: plumb VM into bind/unbind code 2013-08-08 14:04:20 +02:00
i915_gpu_error.c drm/i915: Embed the ring->private within the struct intel_ring_buffer 2013-09-03 19:17:55 +02:00
i915_ioc32.c
i915_irq.c drm/i915: fix gpu hang vs. flip stall deadlocks 2013-09-05 14:48:04 +02:00
i915_reg.h drm/i915: enable trickle feed on Haswell 2013-09-03 19:17:57 +02:00
i915_suspend.c Linux 3.10 2013-07-18 12:03:29 +02:00
i915_sysfs.c drm/i915: Adjust available RPS information through sysfs for vlv 2013-09-03 11:10:55 +02:00
i915_trace.h drm/i915: plumb VM into bind/unbind code 2013-08-08 14:04:20 +02:00
i915_trace_points.c
i915_ums.c drm/i915: scrap register address storage 2013-06-10 19:54:14 +02:00
intel_acpi.c i915: fix ACPI _DSM warning 2013-08-05 19:04:05 +02:00
intel_bios.c drm/i915: Organize VBT stuff inside drm_i915_private 2013-05-10 21:56:46 +02:00
intel_bios.h drm/i915: set CPT FDI RX polarity bits based on VBT 2013-04-18 09:43:31 +02:00
intel_crt.c drm/i915: Apply the force-detect VGA w/a to Valleyview 2013-09-03 11:10:55 +02:00
intel_ddi.c drm/i915: add the FCLK case to intel_ddi_get_cdclk_freq 2013-08-23 14:52:25 +02:00
intel_display.c drm/i915: Confine page flips to BCS on Valleyview 2013-09-06 07:42:32 +02:00
intel_dp.c drm/i915: allow package C8+ states on Haswell (disabled) 2013-08-23 14:52:33 +02:00
intel_drv.h drm/i915: Fix pipe config warnings when dealing with LVDS fixed mode 2013-09-03 19:18:00 +02:00
intel_dvo.c drm/i915/dvo: use native encoder ->mode_set callback 2013-08-04 21:25:21 +02:00
intel_fb.c drm/i915: Export intel_framebuffer_fini 2013-08-06 20:08:50 +02:00
intel_hdmi.c Merge tag 'drm-intel-next-2013-08-23' of git://people.freedesktop.org/~danvet/drm-intel into drm-next 2013-08-30 09:47:41 +10:00
intel_i2c.c drm/i915: allow package C8+ states on Haswell (disabled) 2013-08-23 14:52:33 +02:00
intel_lvds.c drm/i915: Fix pipe config warnings when dealing with LVDS fixed mode 2013-09-03 19:18:00 +02:00
intel_modes.c
intel_opregion.c drm/i915: try not to lose backlight CBLV precision 2013-09-06 09:41:20 +02:00
intel_overlay.c drm/i915: Add VM to pin 2013-08-05 19:04:09 +02:00
intel_panel.c drm/i915: Fix pipe config warnings when dealing with LVDS fixed mode 2013-09-03 19:18:00 +02:00
intel_pm.c drm/i915: enable trickle feed on Haswell 2013-09-03 19:17:57 +02:00
intel_ringbuffer.c drm/i915: Embed the ring->private within the struct intel_ring_buffer 2013-09-03 19:17:55 +02:00
intel_ringbuffer.h drm/i915: Embed the ring->private within the struct intel_ring_buffer 2013-09-03 19:17:55 +02:00
intel_sdvo.c drm/i915: handle sdvo input pixel multiplier correctly again 2013-09-04 17:34:03 +02:00
intel_sdvo_regs.h
intel_sideband.c drm/i915: change VLV IOSF sideband accessors to not return error code 2013-05-23 23:25:42 +02:00
intel_sprite.c drm/i915: enable trickle feed on Haswell 2013-09-03 19:17:57 +02:00
intel_tv.c drm/i915/tv: Use native encoder->mode_set callback 2013-08-04 21:25:22 +02:00
intel_uncore.c drm/i915: sanitize forcewake registers on reset 2013-09-03 11:10:54 +02:00
Makefile drm/i915: Colocate all GT access routines in the same file 2013-07-25 15:21:50 +02:00