Re: [CI 4/4] drm/i915: Split bxt_ddi_pll_select()

[Manasi Navare <manasi.d.navare@intel.com>]

On Thu, Jul 28, 2016 at 04:34:54PM +0300, Ander Conselvan de Oliveira wrote:
> From: "R, Durgadoss" <durgadoss.r@intel.com>
> 
> Split out of bxt_ddi_pll_select() the logic that calculates the pll
> dividers and dpll_hw_state into a new function that doesn't depend on
> crtc state. This will be used for enabling the port pll when doing
> upfront link training.
> 
> v2:
> * Refactored code so that bxt_clk_div need not be exported (Durga)
> v1:
> * Rebased on top of intel_dpll_mgr.c (Durga)
> * Initial version from Ander on top of intel_ddi.c
>
  Reviewed-by: Manasi Navare <manasi.d.navare@intel.com> 
> Signed-off-by: Ander Conselvan de Oliveira <ander.conselvan.de.oliveira@intel.com>
> Signed-off-by: Durgadoss R <durgadoss.r@intel.com>
> ---
>  drivers/gpu/drm/i915/intel_dpll_mgr.c | 165 +++++++++++++++++++++-------------
>  drivers/gpu/drm/i915/intel_dpll_mgr.h |   3 +
>  2 files changed, 104 insertions(+), 64 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_dpll_mgr.c b/drivers/gpu/drm/i915/intel_dpll_mgr.c
> index 0e1af4d..61d2311 100644
> --- a/drivers/gpu/drm/i915/intel_dpll_mgr.c
> +++ b/drivers/gpu/drm/i915/intel_dpll_mgr.c
> @@ -1460,6 +1460,8 @@ struct bxt_clk_div {
>  	uint32_t m2_frac;
>  	bool m2_frac_en;
>  	uint32_t n;
> +
> +	int vco;
>  };
>  
>  /* pre-calculated values for DP linkrates */
> @@ -1473,57 +1475,60 @@ static const struct bxt_clk_div bxt_dp_clk_val[] = {
>  	{432000, 3, 1, 32, 1677722, 1, 1}
>  };
>  
> -static struct intel_shared_dpll *
> -bxt_get_dpll(struct intel_crtc *crtc, struct intel_crtc_state *crtc_state,
> -	     struct intel_encoder *encoder)
> +static bool
> +bxt_ddi_hdmi_pll_dividers(struct intel_crtc *intel_crtc,
> +			  struct intel_crtc_state *crtc_state, int clock,
> +			  struct bxt_clk_div *clk_div)
>  {
> -	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
> -	struct intel_shared_dpll *pll;
> -	enum intel_dpll_id i;
> -	struct intel_digital_port *intel_dig_port;
> -	struct bxt_clk_div clk_div = {0};
> -	int vco = 0;
> -	uint32_t prop_coef, int_coef, gain_ctl, targ_cnt;
> -	uint32_t lanestagger;
> -	int clock = crtc_state->port_clock;
> +	struct dpll best_clock;
>  
> -	if (encoder->type == INTEL_OUTPUT_HDMI) {
> -		struct dpll best_clock;
> +	/* Calculate HDMI div */
> +	/*
> +	 * FIXME: tie the following calculation into
> +	 * i9xx_crtc_compute_clock
> +	 */
> +	if (!bxt_find_best_dpll(crtc_state, clock, &best_clock)) {
> +		DRM_DEBUG_DRIVER("no PLL dividers found for clock %d pipe %c\n",
> +				 clock, pipe_name(intel_crtc->pipe));
> +		return false;
> +	}
>  
> -		/* Calculate HDMI div */
> -		/*
> -		 * FIXME: tie the following calculation into
> -		 * i9xx_crtc_compute_clock
> -		 */
> -		if (!bxt_find_best_dpll(crtc_state, clock, &best_clock)) {
> -			DRM_DEBUG_DRIVER("no PLL dividers found for clock %d pipe %c\n",
> -					 clock, pipe_name(crtc->pipe));
> -			return NULL;
> -		}
> +	clk_div->p1 = best_clock.p1;
> +	clk_div->p2 = best_clock.p2;
> +	WARN_ON(best_clock.m1 != 2);
> +	clk_div->n = best_clock.n;
> +	clk_div->m2_int = best_clock.m2 >> 22;
> +	clk_div->m2_frac = best_clock.m2 & ((1 << 22) - 1);
> +	clk_div->m2_frac_en = clk_div->m2_frac != 0;
>  
> -		clk_div.p1 = best_clock.p1;
> -		clk_div.p2 = best_clock.p2;
> -		WARN_ON(best_clock.m1 != 2);
> -		clk_div.n = best_clock.n;
> -		clk_div.m2_int = best_clock.m2 >> 22;
> -		clk_div.m2_frac = best_clock.m2 & ((1 << 22) - 1);
> -		clk_div.m2_frac_en = clk_div.m2_frac != 0;
> +	clk_div->vco = best_clock.vco;
>  
> -		vco = best_clock.vco;
> -	} else if (encoder->type == INTEL_OUTPUT_DP ||
> -		   encoder->type == INTEL_OUTPUT_EDP) {
> -		int i;
> +	return true;
> +}
>  
> -		clk_div = bxt_dp_clk_val[0];
> -		for (i = 0; i < ARRAY_SIZE(bxt_dp_clk_val); ++i) {
> -			if (bxt_dp_clk_val[i].clock == clock) {
> -				clk_div = bxt_dp_clk_val[i];
> -				break;
> -			}
> +static void bxt_ddi_dp_pll_dividers(int clock, struct bxt_clk_div *clk_div)
> +{
> +	int i;
> +
> +	*clk_div = bxt_dp_clk_val[0];
> +	for (i = 0; i < ARRAY_SIZE(bxt_dp_clk_val); ++i) {
> +		if (bxt_dp_clk_val[i].clock == clock) {
> +			*clk_div = bxt_dp_clk_val[i];
> +			break;
>  		}
> -		vco = clock * 10 / 2 * clk_div.p1 * clk_div.p2;
>  	}
>  
> +	clk_div->vco = clock * 10 / 2 * clk_div->p1 * clk_div->p2;
> +}
> +
> +static bool bxt_ddi_set_dpll_hw_state(int clock,
> +			  struct bxt_clk_div *clk_div,
> +			  struct intel_dpll_hw_state *dpll_hw_state)
> +{
> +	int vco = clk_div->vco;
> +	uint32_t prop_coef, int_coef, gain_ctl, targ_cnt;
> +	uint32_t lanestagger;
> +
>  	if (vco >= 6200000 && vco <= 6700000) {
>  		prop_coef = 4;
>  		int_coef = 9;
> @@ -1542,12 +1547,9 @@ bxt_get_dpll(struct intel_crtc *crtc, struct intel_crtc_state *crtc_state,
>  		targ_cnt = 9;
>  	} else {
>  		DRM_ERROR("Invalid VCO\n");
> -		return NULL;
> +		return false;
>  	}
>  
> -	memset(&crtc_state->dpll_hw_state, 0,
> -	       sizeof(crtc_state->dpll_hw_state));
> -
>  	if (clock > 270000)
>  		lanestagger = 0x18;
>  	else if (clock > 135000)
> @@ -1559,33 +1561,68 @@ bxt_get_dpll(struct intel_crtc *crtc, struct intel_crtc_state *crtc_state,
>  	else
>  		lanestagger = 0x02;
>  
> -	crtc_state->dpll_hw_state.ebb0 =
> -		PORT_PLL_P1(clk_div.p1) | PORT_PLL_P2(clk_div.p2);
> -	crtc_state->dpll_hw_state.pll0 = clk_div.m2_int;
> -	crtc_state->dpll_hw_state.pll1 = PORT_PLL_N(clk_div.n);
> -	crtc_state->dpll_hw_state.pll2 = clk_div.m2_frac;
> +	dpll_hw_state->ebb0 = PORT_PLL_P1(clk_div->p1) | PORT_PLL_P2(clk_div->p2);
> +	dpll_hw_state->pll0 = clk_div->m2_int;
> +	dpll_hw_state->pll1 = PORT_PLL_N(clk_div->n);
> +	dpll_hw_state->pll2 = clk_div->m2_frac;
>  
> -	if (clk_div.m2_frac_en)
> -		crtc_state->dpll_hw_state.pll3 =
> -			PORT_PLL_M2_FRAC_ENABLE;
> +	if (clk_div->m2_frac_en)
> +		dpll_hw_state->pll3 = PORT_PLL_M2_FRAC_ENABLE;
>  
> -	crtc_state->dpll_hw_state.pll6 =
> -		prop_coef | PORT_PLL_INT_COEFF(int_coef);
> -	crtc_state->dpll_hw_state.pll6 |=
> -		PORT_PLL_GAIN_CTL(gain_ctl);
> +	dpll_hw_state->pll6 = prop_coef | PORT_PLL_INT_COEFF(int_coef);
> +	dpll_hw_state->pll6 |= PORT_PLL_GAIN_CTL(gain_ctl);
>  
> -	crtc_state->dpll_hw_state.pll8 = targ_cnt;
> +	dpll_hw_state->pll8 = targ_cnt;
>  
> -	crtc_state->dpll_hw_state.pll9 = 5 << PORT_PLL_LOCK_THRESHOLD_SHIFT;
> +	dpll_hw_state->pll9 = 5 << PORT_PLL_LOCK_THRESHOLD_SHIFT;
>  
> -	crtc_state->dpll_hw_state.pll10 =
> +	dpll_hw_state->pll10 =
>  		PORT_PLL_DCO_AMP(PORT_PLL_DCO_AMP_DEFAULT)
>  		| PORT_PLL_DCO_AMP_OVR_EN_H;
>  
> -	crtc_state->dpll_hw_state.ebb4 = PORT_PLL_10BIT_CLK_ENABLE;
> +	dpll_hw_state->ebb4 = PORT_PLL_10BIT_CLK_ENABLE;
> +
> +	dpll_hw_state->pcsdw12 = LANESTAGGER_STRAP_OVRD | lanestagger;
> +
> +	return true;
> +}
> +
> +bool bxt_ddi_dp_set_dpll_hw_state(int clock,
> +			  struct intel_dpll_hw_state *dpll_hw_state)
> +{
> +	struct bxt_clk_div clk_div = {0};
> +
> +	bxt_ddi_dp_pll_dividers(clock, &clk_div);
> +
> +	return bxt_ddi_set_dpll_hw_state(clock, &clk_div, dpll_hw_state);
> +}
> +
> +static struct intel_shared_dpll *
> +bxt_get_dpll(struct intel_crtc *crtc,
> +		struct intel_crtc_state *crtc_state,
> +		struct intel_encoder *encoder)
> +{
> +	struct bxt_clk_div clk_div = {0};
> +	struct intel_dpll_hw_state dpll_hw_state = {0};
> +	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
> +	struct intel_digital_port *intel_dig_port;
> +	struct intel_shared_dpll *pll;
> +	int i, clock = crtc_state->port_clock;
> +
> +	if (encoder->type == INTEL_OUTPUT_HDMI
> +	    && !bxt_ddi_hdmi_pll_dividers(crtc, crtc_state,
> +					  clock, &clk_div))
> +			return false;
> +
> +	if ((encoder->type == INTEL_OUTPUT_DP ||
> +		encoder->type == INTEL_OUTPUT_EDP) &&
> +		!bxt_ddi_dp_set_dpll_hw_state(clock, &dpll_hw_state))
> +			return false;
> +
> +	memset(&crtc_state->dpll_hw_state, 0,
> +	       sizeof(crtc_state->dpll_hw_state));
>  
> -	crtc_state->dpll_hw_state.pcsdw12 =
> -		LANESTAGGER_STRAP_OVRD | lanestagger;
> +	crtc_state->dpll_hw_state = dpll_hw_state;
>  
>  	intel_dig_port = enc_to_dig_port(&encoder->base);
>  
> diff --git a/drivers/gpu/drm/i915/intel_dpll_mgr.h b/drivers/gpu/drm/i915/intel_dpll_mgr.h
> index 89c5ada..11a85a5 100644
> --- a/drivers/gpu/drm/i915/intel_dpll_mgr.h
> +++ b/drivers/gpu/drm/i915/intel_dpll_mgr.h
> @@ -160,5 +160,8 @@ void intel_disable_shared_dpll(struct intel_crtc *crtc);
>  void intel_shared_dpll_commit(struct drm_atomic_state *state);
>  void intel_shared_dpll_init(struct drm_device *dev);
>  
> +/* BXT dpll related functions */
> +bool bxt_ddi_dp_set_dpll_hw_state(int clock,
> +			  struct intel_dpll_hw_state *dpll_hw_state);
>  
>  #endif /* _INTEL_DPLL_MGR_H_ */
> -- 
> 2.5.5
> 
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