[Intel-gfx] [PATCH v2 2/2] drm/i915/bxt: Move around lane stagger calculation

[Imre Deak]

On ke, 2015-05-13 at 12:20 +0530, Vandana Kannan wrote:
> Making lane stagger calculation common for HDMI and DP
> 
> v2: Imre's comments addressed
> 	- Remove lane stagger from bxt_clk_div and make it a local variable in
> 	ddi_pll_select
> 
> Signed-off-by: Vandana Kannan <vandana.kannan at intel.com>

Reviewed-by: Imre Deak <imre.deak at intel.com>

> ---
>  drivers/gpu/drm/i915/intel_ddi.c | 40 ++++++++++++++++++++--------------------
>  1 file changed, 20 insertions(+), 20 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
> index a56613c..aadd29e 100644
> --- a/drivers/gpu/drm/i915/intel_ddi.c
> +++ b/drivers/gpu/drm/i915/intel_ddi.c
> @@ -1333,18 +1333,17 @@ struct bxt_clk_div {
>  	uint32_t m2_frac;
>  	bool m2_frac_en;
>  	uint32_t n;
> -	uint32_t lanestagger;
>  };
>  
>  /* pre-calculated values for DP linkrates */
>  static struct bxt_clk_div bxt_dp_clk_val[7] = {
> -	/* 162 */ {4, 2, 32, 1677722, 1, 1, 0xd},
> -	/* 270 */ {4, 1, 27,       0, 0, 1, 0xd},
> -	/* 540 */ {2, 1, 27,       0, 0, 1, 0x18},
> -	/* 216 */ {3, 2, 32, 1677722, 1, 1, 0xd},
> -	/* 243 */ {4, 1, 24, 1258291, 1, 1, 0xd},
> -	/* 324 */ {4, 1, 32, 1677722, 1, 1, 0x18},
> -	/* 432 */ {3, 1, 32, 1677722, 1, 1, 0x18}
> +	/* 162 */ {4, 2, 32, 1677722, 1, 1},
> +	/* 270 */ {4, 1, 27,       0, 0, 1},
> +	/* 540 */ {2, 1, 27,       0, 0, 1},
> +	/* 216 */ {3, 2, 32, 1677722, 1, 1},
> +	/* 243 */ {4, 1, 24, 1258291, 1, 1},
> +	/* 324 */ {4, 1, 32, 1677722, 1, 1},
> +	/* 432 */ {3, 1, 32, 1677722, 1, 1}
>  };
>  
>  static bool
> @@ -1357,7 +1356,7 @@ bxt_ddi_pll_select(struct intel_crtc *intel_crtc,
>  	struct bxt_clk_div clk_div = {0};
>  	int vco = 0;
>  	uint32_t prop_coef, int_coef, gain_ctl, targ_cnt;
> -	uint32_t dcoampovr_en_h, dco_amp;
> +	uint32_t dcoampovr_en_h, dco_amp, lanestagger;
>  
>  	if (intel_encoder->type == INTEL_OUTPUT_HDMI) {
>  		intel_clock_t best_clock;
> @@ -1382,16 +1381,6 @@ bxt_ddi_pll_select(struct intel_crtc *intel_crtc,
>  		clk_div.m2_frac_en = clk_div.m2_frac != 0;
>  
>  		vco = best_clock.vco;
> -		if (clock > 270000)
> -			clk_div.lanestagger = 0x18;
> -		else if (clock > 135000)
> -			clk_div.lanestagger = 0x0d;
> -		else if (clock > 67000)
> -			clk_div.lanestagger = 0x07;
> -		else if (clock > 33000)
> -			clk_div.lanestagger = 0x04;
> -		else
> -			clk_div.lanestagger = 0x02;
>  	} else if (intel_encoder->type == INTEL_OUTPUT_DISPLAYPORT ||
>  			intel_encoder->type == INTEL_OUTPUT_EDP) {
>  		struct drm_encoder *encoder = &intel_encoder->base;
> @@ -1439,6 +1428,17 @@ bxt_ddi_pll_select(struct intel_crtc *intel_crtc,
>  		return false;
>  	}
>  
> +	if (clock > 270000)
> +		lanestagger = 0x18;
> +	else if (clock > 135000)
> +		lanestagger = 0x0d;
> +	else if (clock > 67000)
> +		lanestagger = 0x07;
> +	else if (clock > 33000)
> +		lanestagger = 0x04;
> +	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;
> @@ -1462,7 +1462,7 @@ bxt_ddi_pll_select(struct intel_crtc *intel_crtc,
>  	crtc_state->dpll_hw_state.pll10 |= PORT_PLL_DCO_AMP(dco_amp);
>  
>  	crtc_state->dpll_hw_state.pcsdw12 =
> -		LANESTAGGER_STRAP_OVRD | clk_div.lanestagger;
> +		LANESTAGGER_STRAP_OVRD | lanestagger;
>  
>  	pll = intel_get_shared_dpll(intel_crtc, crtc_state);
>  	if (pll == NULL) {