[Intel-gfx] [PATCH 11/16] drm/i915: Do not initialize display core when display is disabled

[Jani Nikula]

On Fri, 12 Oct 2018, José Roberto de Souza <jose.souza at intel.com> wrote:
> With display disabled, driver don't need to enable any power well
> or load the DMC firmware.
>
> The only thing that *_display_core_init will do when display is
> disabled is call intel_pch_reset_handshake(), so PCH handshake
> will be unset and in counterpart *_display_core_uninit() will
> only disable DC.
>
> The power wells enabled by BIOS during boot will be disabled in
> futher patch.
>
> Signed-off-by: José Roberto de Souza <jose.souza at intel.com>
> ---
>  drivers/gpu/drm/i915/intel_runtime_pm.c | 56 ++++++++++++++++---------
>  1 file changed, 36 insertions(+), 20 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_runtime_pm.c b/drivers/gpu/drm/i915/intel_runtime_pm.c
> index 3b2588a377a9..8b1c4d0db0af 100644
> --- a/drivers/gpu/drm/i915/intel_runtime_pm.c
> +++ b/drivers/gpu/drm/i915/intel_runtime_pm.c
> @@ -3285,6 +3285,9 @@ static void skl_display_core_init(struct drm_i915_private *dev_priv,
>  	/* enable PCH reset handshake */
>  	intel_pch_reset_handshake(dev_priv, !HAS_PCH_NOP(dev_priv));
>  
> +	if (!INTEL_INFO(dev_priv)->num_pipes)
> +		return;
> +
>  	/* enable PG1 and Misc I/O */
>  	mutex_lock(&power_domains->lock);
>  
> @@ -3296,8 +3299,7 @@ static void skl_display_core_init(struct drm_i915_private *dev_priv,
>  
>  	mutex_unlock(&power_domains->lock);
>  
> -	if (INTEL_INFO(dev_priv)->num_pipes)
> -		skl_init_cdclk(dev_priv);
> +	skl_init_cdclk(dev_priv);

Please do the series in a way that doesn't need to undo stuff you add
earlier in the series.

>  
>  	gen9_dbuf_enable(dev_priv);
>  
> @@ -3312,10 +3314,12 @@ static void skl_display_core_uninit(struct drm_i915_private *dev_priv)
>  
>  	gen9_set_dc_state(dev_priv, DC_STATE_DISABLE);
>  
> +	if (!INTEL_INFO(dev_priv)->num_pipes)
> +		return;
> +
>  	gen9_dbuf_disable(dev_priv);
>  
> -	if (INTEL_INFO(dev_priv)->num_pipes)
> -		skl_uninit_cdclk(dev_priv);
> +	skl_uninit_cdclk(dev_priv);
>  
>  	/* The spec doesn't call for removing the reset handshake flag */
>  	/* disable PG1 and Misc I/O */
> @@ -3352,6 +3356,9 @@ void bxt_display_core_init(struct drm_i915_private *dev_priv,
>  	 */
>  	intel_pch_reset_handshake(dev_priv, false);
>  
> +	if (!INTEL_INFO(dev_priv)->num_pipes)
> +		return;
> +
>  	/* Enable PG1 */
>  	mutex_lock(&power_domains->lock);
>  
> @@ -3360,8 +3367,7 @@ void bxt_display_core_init(struct drm_i915_private *dev_priv,
>  
>  	mutex_unlock(&power_domains->lock);
>  
> -	if (INTEL_INFO(dev_priv)->num_pipes)
> -		bxt_init_cdclk(dev_priv);
> +	bxt_init_cdclk(dev_priv);
>  
>  	gen9_dbuf_enable(dev_priv);
>  
> @@ -3376,10 +3382,12 @@ void bxt_display_core_uninit(struct drm_i915_private *dev_priv)
>  
>  	gen9_set_dc_state(dev_priv, DC_STATE_DISABLE);
>  
> +	if (!INTEL_INFO(dev_priv)->num_pipes)
> +		return;
> +
>  	gen9_dbuf_disable(dev_priv);
>  
> -	if (INTEL_INFO(dev_priv)->num_pipes)
> -		bxt_uninit_cdclk(dev_priv);
> +	bxt_uninit_cdclk(dev_priv);
>  
>  	/* The spec doesn't call for removing the reset handshake flag */
>  
> @@ -3475,6 +3483,9 @@ static void cnl_display_core_init(struct drm_i915_private *dev_priv, bool resume
>  	/* 1. Enable PCH Reset Handshake */
>  	intel_pch_reset_handshake(dev_priv, !HAS_PCH_NOP(dev_priv));
>  
> +	if (!INTEL_INFO(dev_priv)->num_pipes)
> +		return;
> +
>  	/* 2. Enable Comp */
>  	val = I915_READ(CHICKEN_MISC_2);
>  	val &= ~CNL_COMP_PWR_DOWN;
> @@ -3502,8 +3513,7 @@ static void cnl_display_core_init(struct drm_i915_private *dev_priv, bool resume
>  	mutex_unlock(&power_domains->lock);
>  
>  	/* 5. Enable CD clock */
> -	if (INTEL_INFO(dev_priv)->num_pipes)
> -		cnl_init_cdclk(dev_priv);
> +	cnl_init_cdclk(dev_priv);
>  
>  	/* 6. Enable DBUF */
>  	gen9_dbuf_enable(dev_priv);
> @@ -3520,14 +3530,16 @@ static void cnl_display_core_uninit(struct drm_i915_private *dev_priv)
>  
>  	gen9_set_dc_state(dev_priv, DC_STATE_DISABLE);
>  
> -	/* 1. Disable all display engine functions -> aready done */
> +	if (!INTEL_INFO(dev_priv)->num_pipes)
> +		return;
> +
> +	/* 1. Disable all display engine functions -> already done */
>  
>  	/* 2. Disable DBUF */
>  	gen9_dbuf_disable(dev_priv);
>  
>  	/* 3. Disable CD clock */
> -	if (INTEL_INFO(dev_priv)->num_pipes)
> -		cnl_uninit_cdclk(dev_priv);
> +	cnl_uninit_cdclk(dev_priv);
>  
>  	/*
>  	 * 4. Disable Power Well 1 (PG1).
> @@ -3560,6 +3572,9 @@ static void icl_display_core_init(struct drm_i915_private *dev_priv,
>  	/* 1. Enable PCH reset handshake. */
>  	intel_pch_reset_handshake(dev_priv, !HAS_PCH_NOP(dev_priv));
>  
> +	if (!INTEL_INFO(dev_priv)->num_pipes)
> +		return;
> +
>  	for (port = PORT_A; port <= PORT_B; port++) {
>  		/* 2. Enable DDI combo PHY comp. */
>  		val = I915_READ(ICL_PHY_MISC(port));
> @@ -3588,8 +3603,7 @@ static void icl_display_core_init(struct drm_i915_private *dev_priv,
>  	mutex_unlock(&power_domains->lock);
>  
>  	/* 5. Enable CDCLK. */
> -	if (INTEL_INFO(dev_priv)->num_pipes)
> -		icl_init_cdclk(dev_priv);
> +	icl_init_cdclk(dev_priv);
>  
>  	/* 6. Enable DBUF. */
>  	icl_dbuf_enable(dev_priv);
> @@ -3610,14 +3624,16 @@ static void icl_display_core_uninit(struct drm_i915_private *dev_priv)
>  
>  	gen9_set_dc_state(dev_priv, DC_STATE_DISABLE);
>  
> -	/* 1. Disable all display engine functions -> aready done */
> +	if (!INTEL_INFO(dev_priv)->num_pipes)
> +		return;
> +
> +	/* 1. Disable all display engine functions -> already done */
>  
>  	/* 2. Disable DBUF */
>  	icl_dbuf_disable(dev_priv);
>  
>  	/* 3. Disable CD clock */
> -	if (INTEL_INFO(dev_priv)->num_pipes)
> -		icl_uninit_cdclk(dev_priv);
> +	icl_uninit_cdclk(dev_priv);
>  
>  	/*
>  	 * 4. Disable Power Well 1 (PG1).
> @@ -3784,11 +3800,11 @@ void intel_power_domains_init_hw(struct drm_i915_private *dev_priv, bool resume)
>  		skl_display_core_init(dev_priv, resume);
>  	} else if (IS_GEN9_LP(dev_priv)) {
>  		bxt_display_core_init(dev_priv, resume);
> -	} else if (IS_CHERRYVIEW(dev_priv)) {
> +	} else if (IS_CHERRYVIEW(dev_priv) && INTEL_INFO(dev_priv)->num_pipes) {
>  		mutex_lock(&power_domains->lock);
>  		chv_phy_control_init(dev_priv);
>  		mutex_unlock(&power_domains->lock);
> -	} else if (IS_VALLEYVIEW(dev_priv)) {
> +	} else if (IS_VALLEYVIEW(dev_priv) && INTEL_INFO(dev_priv)->num_pipes) {
>  		mutex_lock(&power_domains->lock);
>  		vlv_cmnlane_wa(dev_priv);
>  		mutex_unlock(&power_domains->lock);

Please don't mix platform specific if ladders with display or not.

BR,
Jani.


-- 
Jani Nikula, Intel Open Source Graphics Center