From c2cab901dfe5c53cd412a288450b2f97333a96e5 Mon Sep 17 00:00:00 2001 From: Jesse Barnes Date: Fri, 23 May 2014 13:16:40 -0700 Subject: [PATCH] drm/i915/vlv: assert and de-assert sideband reset at boot and resume v3 MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit 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 Reviewed-by: Ville Syrjälä Signed-off-by: Daniel Vetter --- drivers/gpu/drm/i915/intel_display.c | 19 +++++++++++++++++++ drivers/gpu/drm/i915/intel_drv.h | 3 ++- drivers/gpu/drm/i915/intel_pm.c | 13 ++++++++++--- 3 files changed, 31 insertions(+), 4 deletions(-) diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index 33d7f679e41c..153888eec25d 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -1515,6 +1515,25 @@ static void intel_reset_dpio(struct drm_device *dev) } } else { + /* + * If DPIO has already been reset, e.g. by BIOS, just skip all + * this. + */ + if (I915_READ(DPIO_CTL) & DPIO_CMNRST) + return; + + /* + * From VLV2A0_DP_eDP_HDMI_DPIO_driver_vbios_notes_11.docx: + * Need to assert and de-assert PHY SB reset by gating the + * common lane power, then un-gating it. + * Simply ungating isn't enough to reset the PHY enough to get + * ports and lanes running. + */ + __vlv_set_power_well(dev_priv, PUNIT_POWER_WELL_DPIO_CMN_BC, + false); + __vlv_set_power_well(dev_priv, PUNIT_POWER_WELL_DPIO_CMN_BC, + true); + /* * From VLV2A0_DP_eDP_DPIO_driver_vbios_notes_10.docx - * 6. De-assert cmn_reset/side_reset. Same as VLV X0. diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h index edecf89b7dba..9bb70dc88046 100644 --- a/drivers/gpu/drm/i915/intel_drv.h +++ b/drivers/gpu/drm/i915/intel_drv.h @@ -970,7 +970,8 @@ 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); diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c index 8e909455e80a..d14bd6f0fc44 100644 --- a/drivers/gpu/drm/i915/intel_pm.c +++ b/drivers/gpu/drm/i915/intel_pm.c @@ -5901,10 +5901,9 @@ static bool i9xx_always_on_power_well_enabled(struct drm_i915_private *dev_priv, return true; } -static void vlv_set_power_well(struct drm_i915_private *dev_priv, - struct i915_power_well *power_well, bool enable) +void __vlv_set_power_well(struct drm_i915_private *dev_priv, + enum punit_power_well power_well_id, bool enable) { - enum punit_power_well power_well_id = power_well->data; u32 mask; u32 state; u32 ctrl; @@ -5937,6 +5936,14 @@ out: mutex_unlock(&dev_priv->rps.hw_lock); } +static void vlv_set_power_well(struct drm_i915_private *dev_priv, + struct i915_power_well *power_well, bool enable) +{ + enum punit_power_well power_well_id = power_well->data; + + __vlv_set_power_well(dev_priv, power_well_id, enable); +} + static void vlv_power_well_sync_hw(struct drm_i915_private *dev_priv, struct i915_power_well *power_well) { -- 2.39.5