Re: [PATCH 08/13] drm/i915: Refactor platform specifics out of intel_get_shared_dpll()

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Op 26-02-16 om 14:54 schreef Ander Conselvan de Oliveira:
> The function intel_get_shared_dpll() had a more or less generic
> implementation with some platform specific checks to handle smaller
> differences between platforms. However, the minimalist approach forces
> bigger differences between platforms to be implemented outside of the
> shared dpll code (see the *_ddi_pll_select() functions in intel_ddi.c,
> for instance).
>
> This patch changes the implementation of intel_get_share_dpll() so that
> a completely platform specific version can be used, providing helpers to
> reduce code duplication. This should allow the code from the ddi pll
> select functions to be moved, and also make room for making more dplls
> managed by the shared dpll infrastructure.
>
> Signed-off-by: Ander Conselvan de Oliveira <ander.conselvan.de.oliveira@xxxxxxxxx>
> ---
>  drivers/gpu/drm/i915/i915_drv.h       |   1 +
>  drivers/gpu/drm/i915/intel_dpll_mgr.c | 226 +++++++++++++++++++++-------------
>  drivers/gpu/drm/i915/intel_dpll_mgr.h |   2 +
>  3 files changed, 145 insertions(+), 84 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index 6de93dc..b858801 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -1802,6 +1802,7 @@ struct drm_i915_private {
>  	/* dpll and cdclk state is protected by connection_mutex */
>  	int num_shared_dpll;
>  	struct intel_shared_dpll shared_dplls[I915_NUM_PLLS];
> +	const struct intel_dpll_mgr *dpll_mgr;
>  
>  	unsigned int active_crtcs;
>  	unsigned int min_pixclk[I915_MAX_PIPES];
> diff --git a/drivers/gpu/drm/i915/intel_dpll_mgr.c b/drivers/gpu/drm/i915/intel_dpll_mgr.c
> index e88dc46..3553324 100644
> --- a/drivers/gpu/drm/i915/intel_dpll_mgr.c
> +++ b/drivers/gpu/drm/i915/intel_dpll_mgr.c
> @@ -174,66 +174,20 @@ void intel_disable_shared_dpll(struct intel_crtc *crtc)
>  	intel_display_power_put(dev_priv, POWER_DOMAIN_PLLS);
>  }
>  
> -static enum intel_dpll_id
> -ibx_get_fixed_dpll(struct intel_crtc *crtc,
> -		   struct intel_crtc_state *crtc_state)
> -{
> -	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
> -	struct intel_shared_dpll *pll;
> -	enum intel_dpll_id i;
> -
> -	/* Ironlake PCH has a fixed PLL->PCH pipe mapping. */
> -	i = (enum intel_dpll_id) crtc->pipe;
> -	pll = &dev_priv->shared_dplls[i];
> -
> -	DRM_DEBUG_KMS("CRTC:%d using pre-allocated %s\n",
> -		      crtc->base.base.id, pll->name);
> -
> -	return i;
> -}
> -
> -static enum intel_dpll_id
> -bxt_get_fixed_dpll(struct intel_crtc *crtc,
> -		   struct intel_crtc_state *crtc_state)
> -{
> -	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
> -	struct intel_encoder *encoder;
> -	struct intel_digital_port *intel_dig_port;
> -	struct intel_shared_dpll *pll;
> -	enum intel_dpll_id i;
> -
> -	/* PLL is attached to port in bxt */
> -	encoder = intel_ddi_get_crtc_new_encoder(crtc_state);
> -	if (WARN_ON(!encoder))
> -		return DPLL_ID_PRIVATE;
> -
> -	intel_dig_port = enc_to_dig_port(&encoder->base);
> -	/* 1:1 mapping between ports and PLLs */
> -	i = (enum intel_dpll_id)intel_dig_port->port;
> -	pll = &dev_priv->shared_dplls[i];
> -	DRM_DEBUG_KMS("CRTC:%d using pre-allocated %s\n",
> -		crtc->base.base.id, pll->name);
> -
> -	return i;
> -}
> -
> -static enum intel_dpll_id
> +static struct intel_shared_dpll *
>  intel_find_shared_dpll(struct intel_crtc *crtc,
> -		       struct intel_crtc_state *crtc_state)
> +		       struct intel_crtc_state *crtc_state,
> +		       enum intel_dpll_id range_min,
> +		       enum intel_dpll_id range_max)
>  {
>  	struct drm_i915_private *dev_priv = crtc->base.dev->dev_private;
>  	struct intel_shared_dpll *pll;
>  	struct intel_shared_dpll_config *shared_dpll;
>  	enum intel_dpll_id i;
> -	int max = dev_priv->num_shared_dpll;
> -
> -	if (INTEL_INFO(dev_priv)->gen < 9 && HAS_DDI(dev_priv))
> -		/* Do not consider SPLL */
> -		max = 2;
>  
>  	shared_dpll = intel_atomic_get_shared_dpll_state(crtc_state->base.state);
>  
> -	for (i = 0; i < max; i++) {
> +	for (i = range_min; i <= range_max; i++) {
>  		pll = &dev_priv->shared_dplls[i];
>  
>  		/* Only want to check enabled timings first */
> @@ -247,49 +201,33 @@ intel_find_shared_dpll(struct intel_crtc *crtc,
>  				      crtc->base.base.id, pll->name,
>  				      shared_dpll[i].crtc_mask,
>  				      pll->active);
> -			return i;
> +			return pll;
>  		}
>  	}
>  
>  	/* Ok no matching timings, maybe there's a free one? */
> -	for (i = 0; i < dev_priv->num_shared_dpll; i++) {
> +	for (i = range_min; i <= range_max; i++) {
>  		pll = &dev_priv->shared_dplls[i];
>  		if (shared_dpll[i].crtc_mask == 0) {
>  			DRM_DEBUG_KMS("CRTC:%d allocated %s\n",
>  				      crtc->base.base.id, pll->name);
> -			return i;
> +			return pll;
>  		}
>  	}
>  
> -	return DPLL_ID_PRIVATE;
> +	return NULL;
>  }
>  
> -struct intel_shared_dpll *
> -intel_get_shared_dpll(struct intel_crtc *crtc,
> -		      struct intel_crtc_state *crtc_state)
> +static void
> +intel_reference_shared_dpll(struct intel_shared_dpll *pll,
> +			    struct intel_crtc_state *crtc_state)
>  {
> -	struct drm_i915_private *dev_priv = crtc->base.dev->dev_private;
> -	struct intel_shared_dpll *pll;
>  	struct intel_shared_dpll_config *shared_dpll;
> -	enum intel_dpll_id i;
> +	struct intel_crtc *crtc = to_intel_crtc(crtc_state->base.crtc);
> +	enum intel_dpll_id i = pll->id;
>  
>  	shared_dpll = intel_atomic_get_shared_dpll_state(crtc_state->base.state);
>  
> -	if (HAS_PCH_IBX(dev_priv->dev)) {
> -		i = ibx_get_fixed_dpll(crtc, crtc_state);
> -		WARN_ON(shared_dpll[i].crtc_mask);
> -	} else if (IS_BROXTON(dev_priv->dev)) {
> -		i = bxt_get_fixed_dpll(crtc, crtc_state);
> -		WARN_ON(shared_dpll[i].crtc_mask);
> -	} else {
> -		i = intel_find_shared_dpll(crtc, crtc_state);
> -	}
> -
> -	if (i < 0)
> -		return NULL;
> -
> -	pll = &dev_priv->shared_dplls[i];
> -
>  	if (shared_dpll[i].crtc_mask == 0)
>  		shared_dpll[i].hw_state =
>  			crtc_state->dpll_hw_state;
> @@ -299,8 +237,6 @@ intel_get_shared_dpll(struct intel_crtc *crtc,
>  			 pipe_name(crtc->pipe));
>  
>  	intel_shared_dpll_config_get(shared_dpll, pll, crtc);
> -
> -	return pll;
>  }
>  
>  void intel_shared_dpll_commit(struct drm_atomic_state *state)
> @@ -398,6 +334,32 @@ static void ibx_pch_dpll_disable(struct drm_i915_private *dev_priv,
>  	udelay(200);
>  }
>  
> +static struct intel_shared_dpll *
> +ibx_get_dpll(struct intel_crtc *crtc, struct intel_crtc_state *crtc_state)
> +{
> +	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
> +	struct intel_shared_dpll *pll;
> +	enum intel_dpll_id i;
> +
> +	if (HAS_PCH_IBX(dev_priv)) {
> +		/* Ironlake PCH has a fixed PLL->PCH pipe mapping. */
> +		i = (enum intel_dpll_id) crtc->pipe;
> +		pll = &dev_priv->shared_dplls[i];
> +
> +		DRM_DEBUG_KMS("CRTC:%d using pre-allocated %s\n",
> +			      crtc->base.base.id, pll->name);
> +	} else {
> +		pll = intel_find_shared_dpll(crtc, crtc_state,
> +					     DPLL_ID_PCH_PLL_A,
> +					     DPLL_ID_PCH_PLL_B);
> +	}
> +
> +	/* reference the pll */
> +	intel_reference_shared_dpll(pll, crtc_state);
> +
> +	return pll;
> +}
> +
>  static const struct intel_shared_dpll_funcs ibx_pch_dpll_funcs = {
>  	.mode_set = ibx_pch_dpll_mode_set,
>  	.enable = ibx_pch_dpll_enable,
> @@ -475,6 +437,19 @@ static bool hsw_ddi_spll_get_hw_state(struct drm_i915_private *dev_priv,
>  	return val & SPLL_PLL_ENABLE;
>  }
>  
> +static struct intel_shared_dpll *
> +hsw_get_dpll(struct intel_crtc *crtc, struct intel_crtc_state *crtc_state)
> +{
> +	struct intel_shared_dpll *pll;
> +
> +	pll = intel_find_shared_dpll(crtc, crtc_state,
> +				     DPLL_ID_WRPLL1, DPLL_ID_WRPLL2);
> +	if (pll)
> +		intel_reference_shared_dpll(pll, crtc_state);
> +
> +	return pll;
> +}
> +
>  
>  static const struct intel_shared_dpll_funcs hsw_ddi_wrpll_funcs = {
>  	.enable = hsw_ddi_wrpll_enable,
> @@ -594,6 +569,19 @@ out:
>  	return ret;
>  }
>  
> +static struct intel_shared_dpll *
> +skl_get_dpll(struct intel_crtc *crtc, struct intel_crtc_state *crtc_state)
> +{
> +	struct intel_shared_dpll *pll;
> +
> +	pll = intel_find_shared_dpll(crtc, crtc_state,
> +				     DPLL_ID_SKL_DPLL1, DPLL_ID_SKL_DPLL3);
> +	if (pll)
> +		intel_reference_shared_dpll(pll, crtc_state);
> +
> +	return pll;
> +}
> +
>  static const struct intel_shared_dpll_funcs skl_ddi_pll_funcs = {
>  	.enable = skl_ddi_pll_enable,
>  	.disable = skl_ddi_pll_disable,
> @@ -782,6 +770,32 @@ out:
>  	return ret;
>  }
>  
> +static struct intel_shared_dpll *
> +bxt_get_dpll(struct intel_crtc *crtc, struct intel_crtc_state *crtc_state)
> +{
> +	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
> +	struct intel_encoder *encoder;
> +	struct intel_digital_port *intel_dig_port;
> +	struct intel_shared_dpll *pll;
> +	enum intel_dpll_id i;
> +
> +	/* PLL is attached to port in bxt */
> +	encoder = intel_ddi_get_crtc_new_encoder(crtc_state);
> +	if (WARN_ON(!encoder))
> +		return NULL;
> +
> +	intel_dig_port = enc_to_dig_port(&encoder->base);
> +	/* 1:1 mapping between ports and PLLs */
> +	i = (enum intel_dpll_id)intel_dig_port->port;
> +	pll = &dev_priv->shared_dplls[i];
> +	DRM_DEBUG_KMS("CRTC:%d using pre-allocated %s\n",
> +		crtc->base.base.id, pll->name);
> +
> +	intel_reference_shared_dpll(pll, crtc_state);
> +
> +	return pll;
> +}
> +
>  static const struct intel_shared_dpll_funcs bxt_ddi_pll_funcs = {
>  	.enable = bxt_ddi_pll_enable,
>  	.disable = bxt_ddi_pll_disable,
> @@ -826,12 +840,24 @@ struct dpll_info {
>  	const struct intel_shared_dpll_funcs *funcs;
>  };
>  
> +struct intel_dpll_mgr {
> +	const struct dpll_info *dpll_info;
> +
> +	struct intel_shared_dpll *(*get_dpll)(struct intel_crtc *crtc,
> +					      struct intel_crtc_state *crtc_state);
> +};
> +
>  static const struct dpll_info pch_plls[] = {
>  	{ "PCH DPLL A", DPLL_ID_PCH_PLL_A, &ibx_pch_dpll_funcs },
>  	{ "PCH DPLL B", DPLL_ID_PCH_PLL_B, &ibx_pch_dpll_funcs },
>  	{ NULL, -1, NULL },
>  };
>  
> +static const struct intel_dpll_mgr pch_pll_mgr = {
> +	.dpll_info = pch_plls,
> +	.get_dpll = ibx_get_dpll,
> +};
> +
>  static const struct dpll_info hsw_plls[] = {
>  	{ "WRPLL 1", DPLL_ID_WRPLL1, &hsw_ddi_wrpll_funcs },
>  	{ "WRPLL 2", DPLL_ID_WRPLL2, &hsw_ddi_wrpll_funcs },
> @@ -839,6 +865,11 @@ static const struct dpll_info hsw_plls[] = {
>  	{ NULL, -1, NULL, },
>  };
>  
> +static const struct intel_dpll_mgr hsw_pll_mgr = {
> +	.dpll_info = hsw_plls,
> +	.get_dpll = hsw_get_dpll,
> +};
> +
>  static const struct dpll_info skl_plls[] = {
>  	{ "DPPL 1", DPLL_ID_SKL_DPLL1, &skl_ddi_pll_funcs },
>  	{ "DPPL 2", DPLL_ID_SKL_DPLL2, &skl_ddi_pll_funcs },
> @@ -846,6 +877,11 @@ static const struct dpll_info skl_plls[] = {
>  	{ NULL, -1, NULL, },
>  };
>  
> +static const struct intel_dpll_mgr skl_pll_mgr = {
> +	.dpll_info = skl_plls,
> +	.get_dpll = skl_get_dpll,
> +};
> +
>  static const struct dpll_info bxt_plls[] = {
>  	{ "PORT PLL A", 0, &bxt_ddi_pll_funcs },
>  	{ "PORT PLL B", 1, &bxt_ddi_pll_funcs },
> @@ -853,26 +889,34 @@ static const struct dpll_info bxt_plls[] = {
>  	{ NULL, -1, NULL, },
>  };
>  
> +static const struct intel_dpll_mgr bxt_pll_mgr = {
> +	.dpll_info = bxt_plls,
> +	.get_dpll = bxt_get_dpll,
> +};
> +
>  void intel_shared_dpll_init(struct drm_device *dev)
>  {
>  	struct drm_i915_private *dev_priv = dev->dev_private;
> -	const struct dpll_info *dpll_info = NULL;
> +	const struct intel_dpll_mgr *dpll_mgr = NULL;
> +	const struct dpll_info *dpll_info;
>  	int i;
>  
>  	if (IS_SKYLAKE(dev) || IS_KABYLAKE(dev))
> -		dpll_info = skl_plls;
> +		dpll_mgr = &skl_pll_mgr;
>  	else if IS_BROXTON(dev)
> -		dpll_info = bxt_plls;
> +		dpll_mgr = &bxt_pll_mgr;
>  	else if (HAS_DDI(dev))
> -		dpll_info = hsw_plls;
> +		dpll_mgr = &hsw_pll_mgr;
>  	else if (HAS_PCH_IBX(dev) || HAS_PCH_CPT(dev))
> -		dpll_info = pch_plls;
> +		dpll_mgr = &pch_pll_mgr;
>  
> -	if (!dpll_info) {
> +	if (!dpll_mgr) {
>  		dev_priv->num_shared_dpll = 0;
>  		return;
>  	}
>  
> +	dpll_info = dpll_mgr->dpll_info;
> +
>  	for (i = 0; dpll_info[i].id >= 0; i++) {
>  		WARN_ON(i != dpll_info[i].id);
>  
> @@ -881,6 +925,7 @@ void intel_shared_dpll_init(struct drm_device *dev)
>  		dev_priv->shared_dplls[i].funcs = *dpll_info[i].funcs;
>  	}
>  
> +	dev_priv->dpll_mgr = dpll_mgr;
>  	dev_priv->num_shared_dpll = i;
>  
>  	BUG_ON(dev_priv->num_shared_dpll > I915_NUM_PLLS);
> @@ -889,3 +934,16 @@ void intel_shared_dpll_init(struct drm_device *dev)
>  	if (HAS_DDI(dev))
>  		intel_ddi_pll_init(dev);
>  }
> +
> +struct intel_shared_dpll *
> +intel_get_shared_dpll(struct intel_crtc *crtc,
> +		      struct intel_crtc_state *crtc_state)
> +{
> +	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
> +	const struct intel_dpll_mgr *dpll_mgr = dev_priv->dpll_mgr;
> +
> +	if (dpll_mgr)
> +		return dpll_mgr->get_dpll(crtc, crtc_state);
> +	else
> +		return NULL;
> +}
should there be a WARN_ON here?

Rest looks good, so for patch 8...11/13:

Reviewed-by: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
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