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| author | Nicholas Mc Guire <hofrat@osadl.org> | 2016-12-16 02:59:20 +0100 |
|---|---|---|
| committer | Jani Nikula <jani.nikula@intel.com> | 2016-12-16 11:21:30 +0200 |
| commit | 0a7b35ce2e7a8744ff2b7689f09bd4f5e00e77f1 (patch) | |
| tree | 7c11ed1e5a3da1654592164089e779f023eddc36 /drivers/gpu/drm/i915/intel_dsi.c | |
| parent | 776594d528073983ce462f7cb03b51e36894923c (diff) | |
| download | op-kernel-dev-0a7b35ce2e7a8744ff2b7689f09bd4f5e00e77f1.zip op-kernel-dev-0a7b35ce2e7a8744ff2b7689f09bd4f5e00e77f1.tar.gz | |
drm/i915: relax uncritical udelay_range() settings
udelay_range(2, 3) is inefficient and as discussions with Jani Nikula
<jani.nikula@linux.intel.com> unnecessary here. This replaces this
tight setting with a relaxed delay of min=20 and max=50. which helps
the hrtimer subsystem optimize timer handling.
Link: http://lkml.org/lkml/2016/12/15/127
Fixes: commit 37ab0810c9b7 ("drm/i915/bxt: DSI enable for BXT")
Signed-off-by: Nicholas Mc Guire <hofrat@osadl.org>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1481853560-19795-1-git-send-email-hofrat@osadl.org
Diffstat (limited to 'drivers/gpu/drm/i915/intel_dsi.c')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_dsi.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/gpu/drm/i915/intel_dsi.c b/drivers/gpu/drm/i915/intel_dsi.c index 0668bbe..c978852 100644 --- a/drivers/gpu/drm/i915/intel_dsi.c +++ b/drivers/gpu/drm/i915/intel_dsi.c @@ -379,7 +379,8 @@ static void bxt_dsi_device_ready(struct intel_encoder *encoder) val &= ~ULPS_STATE_MASK; val |= (ULPS_STATE_ENTER | DEVICE_READY); I915_WRITE(MIPI_DEVICE_READY(port), val); - usleep_range(2, 3); + /* at least 2us - relaxed for hrtimer subsystem optimization */ + usleep_range(10, 50); /* 3. Exit ULPS */ val = I915_READ(MIPI_DEVICE_READY(port)); |
