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| author | Jesse Barnes <jbarnes@virtuousgeek.org> | 2014-05-24 00:16:40 +0400 |
|---|---|---|
| committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2014-06-05 10:52:34 +0400 |
| commit | 570210598444f2b9c20db8b0e7a877633a3cb1ea (patch) | |
| tree | 21e502c7110c2fcf7b3d5d8a7e1b7d6dbd98cc0f /drivers/gpu/drm/i915/intel_drv.h | |
| parent | c315faf8e6ec7a8e59bc1f95f66841a78879ae72 (diff) | |
| download | linux-570210598444f2b9c20db8b0e7a877633a3cb1ea.tar.xz | |
drm/i915/vlv: assert and de-assert sideband reset at boot and resume v3
This is a bit like the CMN reset de-assert we do in DPIO_CTL, except
that it resets the whole common lane section of the PHY. This is
required on machines where the BIOS doesn't do this for us on boot or
resume to properly re-calibrate and get the PHY ready to transmit data.
Without this patch, such machines won't resume correctly much of the time,
with the symptom being a 'port ready' timeout and/or a link training
failure.
Note that simply asserting reset at suspend and de-asserting at resume
is not sufficient, nor is simply de-asserting at boot. Both of these
cases have been tested and have still been found to have failures on
some configurations.
v2: extract simpler set_power_well function for use in reset_dpio (Imre)
move to reset_dpio (Daniel & Ville)
v3: don't reset if DPIO reset is already de-asserted (Imre)
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Diffstat (limited to 'drivers/gpu/drm/i915/intel_drv.h')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_drv.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h index 0de04983501e..8ce90d621c20 100644 --- a/drivers/gpu/drm/i915/intel_drv.h +++ b/drivers/gpu/drm/i915/intel_drv.h @@ -973,7 +973,8 @@ void intel_runtime_pm_put(struct drm_i915_private *dev_priv); void intel_init_runtime_pm(struct drm_i915_private *dev_priv); void intel_fini_runtime_pm(struct drm_i915_private *dev_priv); void ilk_wm_get_hw_state(struct drm_device *dev); - +void __vlv_set_power_well(struct drm_i915_private *dev_priv, + enum punit_power_well power_well_id, bool enable); /* intel_sdvo.c */ bool intel_sdvo_init(struct drm_device *dev, uint32_t sdvo_reg, bool is_sdvob); |