Re: [PATCH v2 11/13] drm/i915: Add intel_uncore_suspend / resume functions

["Ville Syrjälä" <ville.syrjala@linux.intel.com>]

On Mon, Jan 23, 2017 at 10:09:56PM +0100, Hans de Goede wrote:
> Rename intel_uncore_early_sanitize to intel_uncore_resume, dropping the
> (always true) restore_forcewake argument and add a new intel_uncore_resume
> function to replace the intel_uncore_forcewake_reset(dev_priv, false)
> calls done from the suspend / runtime_suspend functions and make
> intel_uncore_forcewake_reset private.
> 
> This is a preparation patch for adding PMIC bus access notifier support.
> 
> BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=155241
> Signed-off-by: Hans de Goede <hdegoede@redhat.com>
> Tested-by: tagorereddy <tagore.chandan@gmail.com>
> ---
> Changes in v2:
> -Spelling: P-Unit, PMIC
> ---
>  drivers/gpu/drm/i915/i915_drv.c     |  6 +++---
>  drivers/gpu/drm/i915/i915_drv.h     |  6 ++----
>  drivers/gpu/drm/i915/intel_uncore.c | 18 +++++++++++-------
>  3 files changed, 16 insertions(+), 14 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
> index aefab9a..5a62d7a 100644
> --- a/drivers/gpu/drm/i915/i915_drv.c
> +++ b/drivers/gpu/drm/i915/i915_drv.c
> @@ -1445,7 +1445,7 @@ static int i915_drm_suspend(struct drm_device *dev)
>  	opregion_target_state = suspend_to_idle(dev_priv) ? PCI_D1 : PCI_D3cold;
>  	intel_opregion_notify_adapter(dev_priv, opregion_target_state);
>  
> -	intel_uncore_forcewake_reset(dev_priv, false);
> +	intel_uncore_suspend(dev_priv);
>  	intel_opregion_unregister(dev_priv);
>  
>  	intel_fbdev_set_suspend(dev, FBINFO_STATE_SUSPENDED, true);
> @@ -1690,7 +1690,7 @@ static int i915_drm_resume_early(struct drm_device *dev)
>  		DRM_ERROR("Resume prepare failed: %d, continuing anyway\n",
>  			  ret);
>  
> -	intel_uncore_early_sanitize(dev_priv, true);
> +	intel_uncore_resume(dev_priv);
>  
>  	if (IS_GEN9_LP(dev_priv)) {
>  		if (!dev_priv->suspended_to_idle)
> @@ -2344,7 +2344,7 @@ static int intel_runtime_suspend(struct device *kdev)
>  		return ret;
>  	}
>  
> -	intel_uncore_forcewake_reset(dev_priv, false);
> +	intel_uncore_suspend(dev_priv);

Doing one from early_resume and the other from the normal suspend makes
my brain hurt a little. If we do that I think we should at least name
the functions appropriately.

>  
>  	enable_rpm_wakeref_asserts(dev_priv);
>  	WARN_ON_ONCE(atomic_read(&dev_priv->pm.wakeref_count));
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index e9b4ece..c717329 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -2976,14 +2976,12 @@ int intel_irq_install(struct drm_i915_private *dev_priv);
>  void intel_irq_uninstall(struct drm_i915_private *dev_priv);
>  
>  extern void intel_uncore_sanitize(struct drm_i915_private *dev_priv);
> -extern void intel_uncore_early_sanitize(struct drm_i915_private *dev_priv,
> -					bool restore_forcewake);
>  extern void intel_uncore_init(struct drm_i915_private *dev_priv);
>  extern bool intel_uncore_unclaimed_mmio(struct drm_i915_private *dev_priv);
>  extern bool intel_uncore_arm_unclaimed_mmio_detection(struct drm_i915_private *dev_priv);
>  extern void intel_uncore_fini(struct drm_i915_private *dev_priv);
> -extern void intel_uncore_forcewake_reset(struct drm_i915_private *dev_priv,
> -					 bool restore);
> +extern void intel_uncore_suspend(struct drm_i915_private *dev_priv);
> +extern void intel_uncore_resume(struct drm_i915_private *dev_priv);
>  const char *intel_uncore_forcewake_domain_to_str(const enum forcewake_domain_id id);
>  void intel_uncore_forcewake_get(struct drm_i915_private *dev_priv,
>  				enum forcewake_domains domains);
> diff --git a/drivers/gpu/drm/i915/intel_uncore.c b/drivers/gpu/drm/i915/intel_uncore.c
> index abe0888..3767307 100644
> --- a/drivers/gpu/drm/i915/intel_uncore.c
> +++ b/drivers/gpu/drm/i915/intel_uncore.c
> @@ -250,7 +250,7 @@ intel_uncore_fw_release_timer(struct hrtimer *timer)
>  	return HRTIMER_NORESTART;
>  }
>  
> -void intel_uncore_forcewake_reset(struct drm_i915_private *dev_priv,
> +static void __intel_uncore_forcewake_reset(struct drm_i915_private *dev_priv,
>  				  bool restore)

Maybe leave out this rename to keep the diff a little easier to parse.

>  {
>  	unsigned long irqflags;
> @@ -424,13 +424,17 @@ static void __intel_uncore_early_sanitize(struct drm_i915_private *dev_priv,
>  	if (IS_BXT_REVID(dev_priv, 0, BXT_REVID_B_LAST))
>  		info->has_decoupled_mmio = false;
>  
> -	intel_uncore_forcewake_reset(dev_priv, restore_forcewake);
> +	__intel_uncore_forcewake_reset(dev_priv, restore_forcewake);
>  }
>  
> -void intel_uncore_early_sanitize(struct drm_i915_private *dev_priv,
> -				 bool restore_forcewake)
> +void intel_uncore_suspend(struct drm_i915_private *dev_priv)
>  {
> -	__intel_uncore_early_sanitize(dev_priv, restore_forcewake);
> +	__intel_uncore_forcewake_reset(dev_priv, false);
> +}
> +
> +void intel_uncore_resume(struct drm_i915_private *dev_priv)
> +{
> +	__intel_uncore_early_sanitize(dev_priv, true);
>  	i915_check_and_clear_faults(dev_priv);
>  }
>  
> @@ -1463,7 +1467,7 @@ void intel_uncore_fini(struct drm_i915_private *dev_priv)
>  {
>  	/* Paranoia: make sure we have disabled everything before we exit. */
>  	intel_uncore_sanitize(dev_priv);
> -	intel_uncore_forcewake_reset(dev_priv, false);
> +	__intel_uncore_forcewake_reset(dev_priv, false);
>  }
>  
>  #define GEN_RANGE(l, h) GENMASK((h) - 1, (l) - 1)
> @@ -1679,7 +1683,7 @@ static int gen6_reset_engines(struct drm_i915_private *dev_priv,
>  
>  	ret = gen6_hw_domain_reset(dev_priv, hw_mask);
>  
> -	intel_uncore_forcewake_reset(dev_priv, true);
> +	__intel_uncore_forcewake_reset(dev_priv, true);
>  
>  	return ret;
>  }
> -- 
> 2.9.3

-- 
Ville Syrjälä
Intel OTC
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