[Intel-gfx] [PATCH 10/16] drm/i915: Do not initialize display clocks when display is disabled

[Jani Nikula]

On Fri, 12 Oct 2018, José Roberto de Souza <jose.souza at intel.com> wrote:
> cdclk and rawclk are the 2 display clocks that can now be completed
> not initialized when display is disabled.

Again, at least at the i915_driver_init_early/i915_driver_load level,
don't add the display checks, add early returns in the functions
themselves.

At the platform specific core uninit/init level this is fine as is.

BR,
Jani.

>
> Signed-off-by: José Roberto de Souza <jose.souza at intel.com>
> ---
>  drivers/gpu/drm/i915/i915_drv.c         |  9 ++++++---
>  drivers/gpu/drm/i915/intel_runtime_pm.c | 27 +++++++++++++++++--------
>  2 files changed, 25 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
> index 22cebe4871c9..4ec598b0a737 100644
> --- a/drivers/gpu/drm/i915/i915_drv.c
> +++ b/drivers/gpu/drm/i915/i915_drv.c
> @@ -900,7 +900,8 @@ static int i915_driver_init_early(struct drm_i915_private *dev_priv)
>  		goto err_uc;
>  	intel_irq_init(dev_priv);
>  	intel_hangcheck_init(dev_priv);
> -	intel_init_display_hooks(dev_priv);
> +	if (INTEL_INFO(dev_priv)->num_pipes)
> +		intel_init_display_hooks(dev_priv);
>  	intel_init_clock_gating_hooks(dev_priv);
>  	if (INTEL_INFO(dev_priv)->num_pipes) {
>  		intel_init_audio_hooks(dev_priv);
> @@ -1709,7 +1710,8 @@ int i915_driver_load(struct pci_dev *pdev, const struct pci_device_id *ent)
>  		goto out_cleanup_mmio;
>  
>  	/* must happen before intel_power_domains_init_hw() on VLV/CHV */
> -	intel_update_rawclk(dev_priv);
> +	if (INTEL_INFO(dev_priv)->num_pipes)
> +		intel_update_rawclk(dev_priv);
>  
>  	/* i915_gem_init() call chain will call
>  	 * intel_display_power_put(i915, POWER_DOMAIN_GT_IRQ);
> @@ -2103,7 +2105,8 @@ static int i915_drm_resume(struct drm_device *dev)
>  
>  	i915_gem_resume(dev_priv);
>  
> -	intel_modeset_init_hw(dev);
> +	if (INTEL_INFO(dev_priv)->num_pipes)
> +		intel_modeset_init_hw(dev);
>  	intel_init_clock_gating(dev_priv);
>  
>  	spin_lock_irq(&dev_priv->irq_lock);
> diff --git a/drivers/gpu/drm/i915/intel_runtime_pm.c b/drivers/gpu/drm/i915/intel_runtime_pm.c
> index 15fd88bb35f7..3b2588a377a9 100644
> --- a/drivers/gpu/drm/i915/intel_runtime_pm.c
> +++ b/drivers/gpu/drm/i915/intel_runtime_pm.c
> @@ -801,6 +801,9 @@ static void gen9_dc_off_power_well_enable(struct drm_i915_private *dev_priv,
>  
>  	gen9_set_dc_state(dev_priv, DC_STATE_DISABLE);
>  
> +	if (!INTEL_INFO(dev_priv)->num_pipes)
> +		return;
> +
>  	dev_priv->display.get_cdclk(dev_priv, &cdclk_state);
>  	/* Can't read out voltage_level so can't use intel_cdclk_changed() */
>  	WARN_ON(intel_cdclk_needs_modeset(&dev_priv->cdclk.hw, &cdclk_state));
> @@ -3293,7 +3296,8 @@ static void skl_display_core_init(struct drm_i915_private *dev_priv,
>  
>  	mutex_unlock(&power_domains->lock);
>  
> -	skl_init_cdclk(dev_priv);
> +	if (INTEL_INFO(dev_priv)->num_pipes)
> +		skl_init_cdclk(dev_priv);
>  
>  	gen9_dbuf_enable(dev_priv);
>  
> @@ -3310,7 +3314,8 @@ static void skl_display_core_uninit(struct drm_i915_private *dev_priv)
>  
>  	gen9_dbuf_disable(dev_priv);
>  
> -	skl_uninit_cdclk(dev_priv);
> +	if (INTEL_INFO(dev_priv)->num_pipes)
> +		skl_uninit_cdclk(dev_priv);
>  
>  	/* The spec doesn't call for removing the reset handshake flag */
>  	/* disable PG1 and Misc I/O */
> @@ -3355,7 +3360,8 @@ void bxt_display_core_init(struct drm_i915_private *dev_priv,
>  
>  	mutex_unlock(&power_domains->lock);
>  
> -	bxt_init_cdclk(dev_priv);
> +	if (INTEL_INFO(dev_priv)->num_pipes)
> +		bxt_init_cdclk(dev_priv);
>  
>  	gen9_dbuf_enable(dev_priv);
>  
> @@ -3372,7 +3378,8 @@ void bxt_display_core_uninit(struct drm_i915_private *dev_priv)
>  
>  	gen9_dbuf_disable(dev_priv);
>  
> -	bxt_uninit_cdclk(dev_priv);
> +	if (INTEL_INFO(dev_priv)->num_pipes)
> +		bxt_uninit_cdclk(dev_priv);
>  
>  	/* The spec doesn't call for removing the reset handshake flag */
>  
> @@ -3495,7 +3502,8 @@ static void cnl_display_core_init(struct drm_i915_private *dev_priv, bool resume
>  	mutex_unlock(&power_domains->lock);
>  
>  	/* 5. Enable CD clock */
> -	cnl_init_cdclk(dev_priv);
> +	if (INTEL_INFO(dev_priv)->num_pipes)
> +		cnl_init_cdclk(dev_priv);
>  
>  	/* 6. Enable DBUF */
>  	gen9_dbuf_enable(dev_priv);
> @@ -3518,7 +3526,8 @@ static void cnl_display_core_uninit(struct drm_i915_private *dev_priv)
>  	gen9_dbuf_disable(dev_priv);
>  
>  	/* 3. Disable CD clock */
> -	cnl_uninit_cdclk(dev_priv);
> +	if (INTEL_INFO(dev_priv)->num_pipes)
> +		cnl_uninit_cdclk(dev_priv);
>  
>  	/*
>  	 * 4. Disable Power Well 1 (PG1).
> @@ -3579,7 +3588,8 @@ static void icl_display_core_init(struct drm_i915_private *dev_priv,
>  	mutex_unlock(&power_domains->lock);
>  
>  	/* 5. Enable CDCLK. */
> -	icl_init_cdclk(dev_priv);
> +	if (INTEL_INFO(dev_priv)->num_pipes)
> +		icl_init_cdclk(dev_priv);
>  
>  	/* 6. Enable DBUF. */
>  	icl_dbuf_enable(dev_priv);
> @@ -3606,7 +3616,8 @@ static void icl_display_core_uninit(struct drm_i915_private *dev_priv)
>  	icl_dbuf_disable(dev_priv);
>  
>  	/* 3. Disable CD clock */
> -	icl_uninit_cdclk(dev_priv);
> +	if (INTEL_INFO(dev_priv)->num_pipes)
> +		icl_uninit_cdclk(dev_priv);
>  
>  	/*
>  	 * 4. Disable Power Well 1 (PG1).

-- 
Jani Nikula, Intel Open Source Graphics Center