Re: [Intel-gfx] [PATCH] drm/i915/pll: Centralize PLL_ENABLE register lookup

["Vivi, Rodrigo" <rodrigo.vivi@intel.com>]

> On Sep 8, 2020, at 4:39 PM, Srivatsa, Anusha <anusha.srivatsa@intel.com> wrote:
> 
> We currenty check for platform at multiple parts in the driver
> to grab the correct PLL. Let us begin to centralize it through a
> helper function.
> 
> v2: s/intel_get_pll_enable_reg()/intel_combo_pll_enable_reg() (Ville)
> 
> v3: Clean up combo_pll_disable() (Rodrigo)
> 
> Suggested-by: Matt Roper <matthew.d.roper@intel.com>
> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
> Cc: Matt Roper <matthew.d.roper@intel.com>
> Signed-off-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
> Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
> ---
> drivers/gpu/drm/i915/display/intel_dpll_mgr.c | 29 +++++++++++--------
> 1 file changed, 17 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_dpll_mgr.c b/drivers/gpu/drm/i915/display/intel_dpll_mgr.c
> index c9013f8f766f..441b6f52e808 100644
> --- a/drivers/gpu/drm/i915/display/intel_dpll_mgr.c
> +++ b/drivers/gpu/drm/i915/display/intel_dpll_mgr.c
> @@ -147,6 +147,18 @@ void assert_shared_dpll(struct drm_i915_private *dev_priv,
> 			pll->info->name, onoff(state), onoff(cur_state));
> }
> 
> +static
> +i915_reg_t intel_combo_pll_enable_reg(struct drm_i915_private *dev_priv,
> +				    struct intel_shared_dpll *pll)
> +{
> +
> +	if (IS_ELKHARTLAKE(dev_priv) && (pll->info->id == DPLL_ID_EHL_DPLL4))
> +			return MG_PLL_ENABLE(0);
> +
> +	return CNL_DPLL_ENABLE(pll->info->id);
> +
> +
> +}
> /**
>  * intel_prepare_shared_dpll - call a dpll's prepare hook
>  * @crtc_state: CRTC, and its state, which has a shared dpll
> @@ -3842,12 +3854,7 @@ static bool combo_pll_get_hw_state(struct drm_i915_private *dev_priv,
> 				   struct intel_shared_dpll *pll,
> 				   struct intel_dpll_hw_state *hw_state)
> {
> -	i915_reg_t enable_reg = CNL_DPLL_ENABLE(pll->info->id);
> -
> -	if (IS_ELKHARTLAKE(dev_priv) &&
> -	    pll->info->id == DPLL_ID_EHL_DPLL4) {
> -		enable_reg = MG_PLL_ENABLE(0);
> -	}
> +	i915_reg_t enable_reg = intel_combo_pll_enable_reg(dev_priv, pll);
> 
> 	return icl_pll_get_hw_state(dev_priv, pll, hw_state, enable_reg);
> }
> @@ -4045,11 +4052,10 @@ static void icl_pll_enable(struct drm_i915_private *dev_priv,
> static void combo_pll_enable(struct drm_i915_private *dev_priv,
> 			     struct intel_shared_dpll *pll)
> {
> -	i915_reg_t enable_reg = CNL_DPLL_ENABLE(pll->info->id);
> +	i915_reg_t enable_reg = intel_combo_pll_enable_reg(dev_priv, pll);
> 
> 	if (IS_ELKHARTLAKE(dev_priv) &&
> 	    pll->info->id == DPLL_ID_EHL_DPLL4) {
> -		enable_reg = MG_PLL_ENABLE(0);
> 
> 		/*
> 		 * We need to disable DC states when this DPLL is enabled.
> @@ -4157,19 +4163,18 @@ static void icl_pll_disable(struct drm_i915_private *dev_priv,
> static void combo_pll_disable(struct drm_i915_private *dev_priv,
> 			      struct intel_shared_dpll *pll)
> {
> -	i915_reg_t enable_reg = CNL_DPLL_ENABLE(pll->info->id);
> +	i915_reg_t enable_reg = intel_combo_pll_enable_reg(dev_priv, pll);
> +
> +	icl_pll_disable(dev_priv, pll, enable_reg);
> 
> 	if (IS_ELKHARTLAKE(dev_priv) &&
> 	    pll->info->id == DPLL_ID_EHL_DPLL4) {
> -		enable_reg = MG_PLL_ENABLE(0);
> -		icl_pll_disable(dev_priv, pll, enable_reg);
> 
> 		intel_display_power_put(dev_priv, POWER_DOMAIN_DPLL_DC_OFF,
> 					pll->wakeref);
> 		return;

this return can also be removed

> 	}
> 
> -	icl_pll_disable(dev_priv, pll, enable_reg);
> }
> 
> static void tbt_pll_disable(struct drm_i915_private *dev_priv,
> -- 
> 2.25.0
> 

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