[PATCH] drm/i915: Compute WR PLL dividers dynamically

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On Fri, May 10, 2013 at 02:01:51PM +0100, Damien Lespiau wrote:
> Up to now, we were using a static table to match the clock frequency
> with a (r2,n2,p) triplet. Despite this table being big, it's by no mean
> comprehensive and we had to fall back to the closest frequency when the
> requested TMDS clock wasn't in the table.
> 
> This patch computes (r2,n2,p) dynamically and get rid of The Big Table.
> 
> v2: Replace the floating point constant 1e6 by 1000000
> 
> Bugzilla: http://bugs.freedesktop.org/show_bug.cgi?id=58497
> Signed-off-by: Damien Lespiau <damien.lespiau at intel.com>

Let's try again ;-)

Queued for -next (with a s/spaces/tab bikeshed applied), thanks for the patch.
-Daniel
> ---
>  drivers/gpu/drm/i915/intel_ddi.c | 617 ++++++++++++++-------------------------
>  1 file changed, 214 insertions(+), 403 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
> index 1468932..5c35386 100644
> --- a/drivers/gpu/drm/i915/intel_ddi.c
> +++ b/drivers/gpu/drm/i915/intel_ddi.c
> @@ -281,392 +281,6 @@ void hsw_fdi_link_train(struct drm_crtc *crtc)
>  	DRM_ERROR("FDI link training failed!\n");
>  }
>  
> -/* WRPLL clock dividers */
> -struct wrpll_tmds_clock {
> -	u32 clock;
> -	u16 p;		/* Post divider */
> -	u16 n2;		/* Feedback divider */
> -	u16 r2;		/* Reference divider */
> -};
> -
> -/* Table of matching values for WRPLL clocks programming for each frequency.
> - * The code assumes this table is sorted. */
> -static const struct wrpll_tmds_clock wrpll_tmds_clock_table[] = {
> -	{19750,	38,	25,	18},
> -	{20000,	48,	32,	18},
> -	{21000,	36,	21,	15},
> -	{21912,	42,	29,	17},
> -	{22000,	36,	22,	15},
> -	{23000,	36,	23,	15},
> -	{23500,	40,	40,	23},
> -	{23750,	26,	16,	14},
> -	{24000,	36,	24,	15},
> -	{25000,	36,	25,	15},
> -	{25175,	26,	40,	33},
> -	{25200,	30,	21,	15},
> -	{26000,	36,	26,	15},
> -	{27000,	30,	21,	14},
> -	{27027,	18,	100,	111},
> -	{27500,	30,	29,	19},
> -	{28000,	34,	30,	17},
> -	{28320,	26,	30,	22},
> -	{28322,	32,	42,	25},
> -	{28750,	24,	23,	18},
> -	{29000,	30,	29,	18},
> -	{29750,	32,	30,	17},
> -	{30000,	30,	25,	15},
> -	{30750,	30,	41,	24},
> -	{31000,	30,	31,	18},
> -	{31500,	30,	28,	16},
> -	{32000,	30,	32,	18},
> -	{32500,	28,	32,	19},
> -	{33000,	24,	22,	15},
> -	{34000,	28,	30,	17},
> -	{35000,	26,	32,	19},
> -	{35500,	24,	30,	19},
> -	{36000,	26,	26,	15},
> -	{36750,	26,	46,	26},
> -	{37000,	24,	23,	14},
> -	{37762,	22,	40,	26},
> -	{37800,	20,	21,	15},
> -	{38000,	24,	27,	16},
> -	{38250,	24,	34,	20},
> -	{39000,	24,	26,	15},
> -	{40000,	24,	32,	18},
> -	{40500,	20,	21,	14},
> -	{40541,	22,	147,	89},
> -	{40750,	18,	19,	14},
> -	{41000,	16,	17,	14},
> -	{41500,	22,	44,	26},
> -	{41540,	22,	44,	26},
> -	{42000,	18,	21,	15},
> -	{42500,	22,	45,	26},
> -	{43000,	20,	43,	27},
> -	{43163,	20,	24,	15},
> -	{44000,	18,	22,	15},
> -	{44900,	20,	108,	65},
> -	{45000,	20,	25,	15},
> -	{45250,	20,	52,	31},
> -	{46000,	18,	23,	15},
> -	{46750,	20,	45,	26},
> -	{47000,	20,	40,	23},
> -	{48000,	18,	24,	15},
> -	{49000,	18,	49,	30},
> -	{49500,	16,	22,	15},
> -	{50000,	18,	25,	15},
> -	{50500,	18,	32,	19},
> -	{51000,	18,	34,	20},
> -	{52000,	18,	26,	15},
> -	{52406,	14,	34,	25},
> -	{53000,	16,	22,	14},
> -	{54000,	16,	24,	15},
> -	{54054,	16,	173,	108},
> -	{54500,	14,	24,	17},
> -	{55000,	12,	22,	18},
> -	{56000,	14,	45,	31},
> -	{56250,	16,	25,	15},
> -	{56750,	14,	25,	17},
> -	{57000,	16,	27,	16},
> -	{58000,	16,	43,	25},
> -	{58250,	16,	38,	22},
> -	{58750,	16,	40,	23},
> -	{59000,	14,	26,	17},
> -	{59341,	14,	40,	26},
> -	{59400,	16,	44,	25},
> -	{60000,	16,	32,	18},
> -	{60500,	12,	39,	29},
> -	{61000,	14,	49,	31},
> -	{62000,	14,	37,	23},
> -	{62250,	14,	42,	26},
> -	{63000,	12,	21,	15},
> -	{63500,	14,	28,	17},
> -	{64000,	12,	27,	19},
> -	{65000,	14,	32,	19},
> -	{65250,	12,	29,	20},
> -	{65500,	12,	32,	22},
> -	{66000,	12,	22,	15},
> -	{66667,	14,	38,	22},
> -	{66750,	10,	21,	17},
> -	{67000,	14,	33,	19},
> -	{67750,	14,	58,	33},
> -	{68000,	14,	30,	17},
> -	{68179,	14,	46,	26},
> -	{68250,	14,	46,	26},
> -	{69000,	12,	23,	15},
> -	{70000,	12,	28,	18},
> -	{71000,	12,	30,	19},
> -	{72000,	12,	24,	15},
> -	{73000,	10,	23,	17},
> -	{74000,	12,	23,	14},
> -	{74176,	8,	100,	91},
> -	{74250,	10,	22,	16},
> -	{74481,	12,	43,	26},
> -	{74500,	10,	29,	21},
> -	{75000,	12,	25,	15},
> -	{75250,	10,	39,	28},
> -	{76000,	12,	27,	16},
> -	{77000,	12,	53,	31},
> -	{78000,	12,	26,	15},
> -	{78750,	12,	28,	16},
> -	{79000,	10,	38,	26},
> -	{79500,	10,	28,	19},
> -	{80000,	12,	32,	18},
> -	{81000,	10,	21,	14},
> -	{81081,	6,	100,	111},
> -	{81624,	8,	29,	24},
> -	{82000,	8,	17,	14},
> -	{83000,	10,	40,	26},
> -	{83950,	10,	28,	18},
> -	{84000,	10,	28,	18},
> -	{84750,	6,	16,	17},
> -	{85000,	6,	17,	18},
> -	{85250,	10,	30,	19},
> -	{85750,	10,	27,	17},
> -	{86000,	10,	43,	27},
> -	{87000,	10,	29,	18},
> -	{88000,	10,	44,	27},
> -	{88500,	10,	41,	25},
> -	{89000,	10,	28,	17},
> -	{89012,	6,	90,	91},
> -	{89100,	10,	33,	20},
> -	{90000,	10,	25,	15},
> -	{91000,	10,	32,	19},
> -	{92000,	10,	46,	27},
> -	{93000,	10,	31,	18},
> -	{94000,	10,	40,	23},
> -	{94500,	10,	28,	16},
> -	{95000,	10,	44,	25},
> -	{95654,	10,	39,	22},
> -	{95750,	10,	39,	22},
> -	{96000,	10,	32,	18},
> -	{97000,	8,	23,	16},
> -	{97750,	8,	42,	29},
> -	{98000,	8,	45,	31},
> -	{99000,	8,	22,	15},
> -	{99750,	8,	34,	23},
> -	{100000,	6,	20,	18},
> -	{100500,	6,	19,	17},
> -	{101000,	6,	37,	33},
> -	{101250,	8,	21,	14},
> -	{102000,	6,	17,	15},
> -	{102250,	6,	25,	22},
> -	{103000,	8,	29,	19},
> -	{104000,	8,	37,	24},
> -	{105000,	8,	28,	18},
> -	{106000,	8,	22,	14},
> -	{107000,	8,	46,	29},
> -	{107214,	8,	27,	17},
> -	{108000,	8,	24,	15},
> -	{108108,	8,	173,	108},
> -	{109000,	6,	23,	19},
> -	{110000,	6,	22,	18},
> -	{110013,	6,	22,	18},
> -	{110250,	8,	49,	30},
> -	{110500,	8,	36,	22},
> -	{111000,	8,	23,	14},
> -	{111264,	8,	150,	91},
> -	{111375,	8,	33,	20},
> -	{112000,	8,	63,	38},
> -	{112500,	8,	25,	15},
> -	{113100,	8,	57,	34},
> -	{113309,	8,	42,	25},
> -	{114000,	8,	27,	16},
> -	{115000,	6,	23,	18},
> -	{116000,	8,	43,	25},
> -	{117000,	8,	26,	15},
> -	{117500,	8,	40,	23},
> -	{118000,	6,	38,	29},
> -	{119000,	8,	30,	17},
> -	{119500,	8,	46,	26},
> -	{119651,	8,	39,	22},
> -	{120000,	8,	32,	18},
> -	{121000,	6,	39,	29},
> -	{121250,	6,	31,	23},
> -	{121750,	6,	23,	17},
> -	{122000,	6,	42,	31},
> -	{122614,	6,	30,	22},
> -	{123000,	6,	41,	30},
> -	{123379,	6,	37,	27},
> -	{124000,	6,	51,	37},
> -	{125000,	6,	25,	18},
> -	{125250,	4,	13,	14},
> -	{125750,	4,	27,	29},
> -	{126000,	6,	21,	15},
> -	{127000,	6,	24,	17},
> -	{127250,	6,	41,	29},
> -	{128000,	6,	27,	19},
> -	{129000,	6,	43,	30},
> -	{129859,	4,	25,	26},
> -	{130000,	6,	26,	18},
> -	{130250,	6,	42,	29},
> -	{131000,	6,	32,	22},
> -	{131500,	6,	38,	26},
> -	{131850,	6,	41,	28},
> -	{132000,	6,	22,	15},
> -	{132750,	6,	28,	19},
> -	{133000,	6,	34,	23},
> -	{133330,	6,	37,	25},
> -	{134000,	6,	61,	41},
> -	{135000,	6,	21,	14},
> -	{135250,	6,	167,	111},
> -	{136000,	6,	62,	41},
> -	{137000,	6,	35,	23},
> -	{138000,	6,	23,	15},
> -	{138500,	6,	40,	26},
> -	{138750,	6,	37,	24},
> -	{139000,	6,	34,	22},
> -	{139050,	6,	34,	22},
> -	{139054,	6,	34,	22},
> -	{140000,	6,	28,	18},
> -	{141000,	6,	36,	23},
> -	{141500,	6,	22,	14},
> -	{142000,	6,	30,	19},
> -	{143000,	6,	27,	17},
> -	{143472,	4,	17,	16},
> -	{144000,	6,	24,	15},
> -	{145000,	6,	29,	18},
> -	{146000,	6,	47,	29},
> -	{146250,	6,	26,	16},
> -	{147000,	6,	49,	30},
> -	{147891,	6,	23,	14},
> -	{148000,	6,	23,	14},
> -	{148250,	6,	28,	17},
> -	{148352,	4,	100,	91},
> -	{148500,	6,	33,	20},
> -	{149000,	6,	48,	29},
> -	{150000,	6,	25,	15},
> -	{151000,	4,	19,	17},
> -	{152000,	6,	27,	16},
> -	{152280,	6,	44,	26},
> -	{153000,	6,	34,	20},
> -	{154000,	6,	53,	31},
> -	{155000,	6,	31,	18},
> -	{155250,	6,	50,	29},
> -	{155750,	6,	45,	26},
> -	{156000,	6,	26,	15},
> -	{157000,	6,	61,	35},
> -	{157500,	6,	28,	16},
> -	{158000,	6,	65,	37},
> -	{158250,	6,	44,	25},
> -	{159000,	6,	53,	30},
> -	{159500,	6,	39,	22},
> -	{160000,	6,	32,	18},
> -	{161000,	4,	31,	26},
> -	{162000,	4,	18,	15},
> -	{162162,	4,	131,	109},
> -	{162500,	4,	53,	44},
> -	{163000,	4,	29,	24},
> -	{164000,	4,	17,	14},
> -	{165000,	4,	22,	18},
> -	{166000,	4,	32,	26},
> -	{167000,	4,	26,	21},
> -	{168000,	4,	46,	37},
> -	{169000,	4,	104,	83},
> -	{169128,	4,	64,	51},
> -	{169500,	4,	39,	31},
> -	{170000,	4,	34,	27},
> -	{171000,	4,	19,	15},
> -	{172000,	4,	51,	40},
> -	{172750,	4,	32,	25},
> -	{172800,	4,	32,	25},
> -	{173000,	4,	41,	32},
> -	{174000,	4,	49,	38},
> -	{174787,	4,	22,	17},
> -	{175000,	4,	35,	27},
> -	{176000,	4,	30,	23},
> -	{177000,	4,	38,	29},
> -	{178000,	4,	29,	22},
> -	{178500,	4,	37,	28},
> -	{179000,	4,	53,	40},
> -	{179500,	4,	73,	55},
> -	{180000,	4,	20,	15},
> -	{181000,	4,	55,	41},
> -	{182000,	4,	31,	23},
> -	{183000,	4,	42,	31},
> -	{184000,	4,	30,	22},
> -	{184750,	4,	26,	19},
> -	{185000,	4,	37,	27},
> -	{186000,	4,	51,	37},
> -	{187000,	4,	36,	26},
> -	{188000,	4,	32,	23},
> -	{189000,	4,	21,	15},
> -	{190000,	4,	38,	27},
> -	{190960,	4,	41,	29},
> -	{191000,	4,	41,	29},
> -	{192000,	4,	27,	19},
> -	{192250,	4,	37,	26},
> -	{193000,	4,	20,	14},
> -	{193250,	4,	53,	37},
> -	{194000,	4,	23,	16},
> -	{194208,	4,	23,	16},
> -	{195000,	4,	26,	18},
> -	{196000,	4,	45,	31},
> -	{197000,	4,	35,	24},
> -	{197750,	4,	41,	28},
> -	{198000,	4,	22,	15},
> -	{198500,	4,	25,	17},
> -	{199000,	4,	28,	19},
> -	{200000,	4,	37,	25},
> -	{201000,	4,	61,	41},
> -	{202000,	4,	112,	75},
> -	{202500,	4,	21,	14},
> -	{203000,	4,	146,	97},
> -	{204000,	4,	62,	41},
> -	{204750,	4,	44,	29},
> -	{205000,	4,	38,	25},
> -	{206000,	4,	29,	19},
> -	{207000,	4,	23,	15},
> -	{207500,	4,	40,	26},
> -	{208000,	4,	37,	24},
> -	{208900,	4,	48,	31},
> -	{209000,	4,	48,	31},
> -	{209250,	4,	31,	20},
> -	{210000,	4,	28,	18},
> -	{211000,	4,	25,	16},
> -	{212000,	4,	22,	14},
> -	{213000,	4,	30,	19},
> -	{213750,	4,	38,	24},
> -	{214000,	4,	46,	29},
> -	{214750,	4,	35,	22},
> -	{215000,	4,	43,	27},
> -	{216000,	4,	24,	15},
> -	{217000,	4,	37,	23},
> -	{218000,	4,	42,	26},
> -	{218250,	4,	42,	26},
> -	{218750,	4,	34,	21},
> -	{219000,	4,	47,	29},
> -	{220000,	4,	44,	27},
> -	{220640,	4,	49,	30},
> -	{220750,	4,	36,	22},
> -	{221000,	4,	36,	22},
> -	{222000,	4,	23,	14},
> -	{222525,	4,	28,	17},
> -	{222750,	4,	33,	20},
> -	{227000,	4,	37,	22},
> -	{230250,	4,	29,	17},
> -	{233500,	4,	38,	22},
> -	{235000,	4,	40,	23},
> -	{238000,	4,	30,	17},
> -	{241500,	2,	17,	19},
> -	{245250,	2,	20,	22},
> -	{247750,	2,	22,	24},
> -	{253250,	2,	15,	16},
> -	{256250,	2,	18,	19},
> -	{262500,	2,	31,	32},
> -	{267250,	2,	66,	67},
> -	{268500,	2,	94,	95},
> -	{270000,	2,	14,	14},
> -	{272500,	2,	77,	76},
> -	{273750,	2,	57,	56},
> -	{280750,	2,	24,	23},
> -	{281250,	2,	23,	22},
> -	{286000,	2,	17,	16},
> -	{291750,	2,	26,	24},
> -	{296703,	2,	56,	51},
> -	{297000,	2,	22,	20},
> -	{298000,	2,	21,	19},
> -};
> -
>  static void intel_ddi_mode_set(struct drm_encoder *encoder,
>  			       struct drm_display_mode *mode,
>  			       struct drm_display_mode *adjusted_mode)
> @@ -790,27 +404,224 @@ void intel_ddi_put_crtc_pll(struct drm_crtc *crtc)
>  	intel_crtc->ddi_pll_sel = PORT_CLK_SEL_NONE;
>  }
>  
> -static void intel_ddi_calculate_wrpll(int clock, int *p, int *n2, int *r2)
> +#define LC_FREQ 2700
> +#define LC_FREQ_2K (LC_FREQ * 2000)
> +
> +#define P_MIN 2
> +#define P_MAX 64
> +#define P_INC 2
> +
> +/* Constraints for PLL good behavior */
> +#define REF_MIN 48
> +#define REF_MAX 400
> +#define VCO_MIN 2400
> +#define VCO_MAX 4800
> +
> +#define ABS_DIFF(a, b) ((a > b) ? (a - b) : (b - a))
> +
> +struct wrpll_rnp {
> +	unsigned p, n2, r2;
> +};
> +
> +static unsigned wrpll_get_budget_for_freq(int clock)
> +{
> +	unsigned budget;
> +
> +	switch (clock) {
> +	case 25175000:
> +	case 25200000:
> +	case 27000000:
> +	case 27027000:
> +	case 37762500:
> +	case 37800000:
> +	case 40500000:
> +	case 40541000:
> +	case 54000000:
> +	case 54054000:
> +	case 59341000:
> +	case 59400000:
> +	case 72000000:
> +	case 74176000:
> +	case 74250000:
> +	case 81000000:
> +	case 81081000:
> +	case 89012000:
> +	case 89100000:
> +	case 108000000:
> +	case 108108000:
> +	case 111264000:
> +	case 111375000:
> +	case 148352000:
> +	case 148500000:
> +	case 162000000:
> +	case 162162000:
> +	case 222525000:
> +	case 222750000:
> +	case 296703000:
> +	case 297000000:
> +		budget = 0;
> +		break;
> +	case 233500000:
> +	case 245250000:
> +	case 247750000:
> +	case 253250000:
> +	case 298000000:
> +		budget = 1500;
> +		break;
> +	case 169128000:
> +	case 169500000:
> +	case 179500000:
> +	case 202000000:
> +		budget = 2000;
> +		break;
> +	case 256250000:
> +	case 262500000:
> +	case 270000000:
> +	case 272500000:
> +	case 273750000:
> +	case 280750000:
> +	case 281250000:
> +	case 286000000:
> +	case 291750000:
> +		budget = 4000;
> +		break;
> +	case 267250000:
> +	case 268500000:
> +		budget = 5000;
> +		break;
> +	default:
> +		budget = 1000;
> +		break;
> +	}
> +
> +	return budget;
> +}
> +
> +static void wrpll_update_rnp(uint64_t freq2k, unsigned budget,
> +			     unsigned r2, unsigned n2, unsigned p,
> +			     struct wrpll_rnp *best)
>  {
> -	u32 i;
> +	uint64_t a, b, c, d, diff, diff_best;
>  
> -	for (i = 0; i < ARRAY_SIZE(wrpll_tmds_clock_table); i++)
> -		if (clock <= wrpll_tmds_clock_table[i].clock)
> -			break;
> +	/* No best (r,n,p) yet */
> +	if (best->p == 0) {
> +		best->p = p;
> +		best->n2 = n2;
> +		best->r2 = r2;
> +		return;
> +	}
> +
> +	/*
> +	 * Output clock is (LC_FREQ_2K / 2000) * N / (P * R), which compares to
> +	 * freq2k.
> +	 *
> +	 * delta = 1e6 *
> +	 *	   abs(freq2k - (LC_FREQ_2K * n2/(p * r2))) /
> +	 *	   freq2k;
> +	 *
> +	 * and we would like delta <= budget.
> +	 *
> +	 * If the discrepancy is above the PPM-based budget, always prefer to
> +	 * improve upon the previous solution.  However, if you're within the
> +	 * budget, try to maximize Ref * VCO, that is N / (P * R^2).
> +	 */
> +	a = freq2k * budget * p * r2;
> +	b = freq2k * budget * best->p * best->r2;
> +	diff = ABS_DIFF((freq2k * p * r2), (LC_FREQ_2K * n2));
> +	diff_best = ABS_DIFF((freq2k * best->p * best->r2),
> +			     (LC_FREQ_2K * best->n2));
> +	c = 1000000 * diff;
> +	d = 1000000 * diff_best;
> +
> +	if (a < c && b < d) {
> +		/* If both are above the budget, pick the closer */
> +		if (best->p * best->r2 * diff < p * r2 * diff_best) {
> +			best->p = p;
> +			best->n2 = n2;
> +			best->r2 = r2;
> +		}
> +	} else if (a >= c && b < d) {
> +		/* If A is below the threshold but B is above it?  Update. */
> +		best->p = p;
> +		best->n2 = n2;
> +		best->r2 = r2;
> +	} else if (a >= c && b >= d) {
> +		/* Both are below the limit, so pick the higher n2/(r2*r2) */
> +		if (n2 * best->r2 * best->r2 > best->n2 * r2 * r2) {
> +			best->p = p;
> +			best->n2 = n2;
> +			best->r2 = r2;
> +		}
> +	}
> +	/* Otherwise a < c && b >= d, do nothing */
> +}
> +
> +static void
> +intel_ddi_calculate_wrpll(int clock /* in Hz */,
> +			  unsigned *r2_out, unsigned *n2_out, unsigned *p_out)
> +{
> +	uint64_t freq2k;
> +	unsigned p, n2, r2;
> +	struct wrpll_rnp best = { 0, 0, 0 };
> +	unsigned budget;
>  
> -	if (i == ARRAY_SIZE(wrpll_tmds_clock_table))
> -		i--;
> +	freq2k = clock / 100;
>  
> -	*p = wrpll_tmds_clock_table[i].p;
> -	*n2 = wrpll_tmds_clock_table[i].n2;
> -	*r2 = wrpll_tmds_clock_table[i].r2;
> +	budget = wrpll_get_budget_for_freq(clock);
> +
> +	/* Special case handling for 540 pixel clock: bypass WR PLL entirely
> +	 * and directly pass the LC PLL to it. */
> +	if (freq2k == 5400000) {
> +		*n2_out = 2;
> +		*p_out = 1;
> +		*r2_out = 2;
> +		return;
> +	}
> +
> +	/*
> +	 * Ref = LC_FREQ / R, where Ref is the actual reference input seen by
> +	 * the WR PLL.
> +	 *
> +	 * We want R so that REF_MIN <= Ref <= REF_MAX.
> +	 * Injecting R2 = 2 * R gives:
> +	 *   REF_MAX * r2 > LC_FREQ * 2 and
> +	 *   REF_MIN * r2 < LC_FREQ * 2
> +	 *
> +	 * Which means the desired boundaries for r2 are:
> +	 *  LC_FREQ * 2 / REF_MAX < r2 < LC_FREQ * 2 / REF_MIN
> +	 *
> +	 */
> +        for (r2 = LC_FREQ * 2 / REF_MAX + 1;
> +	     r2 <= LC_FREQ * 2 / REF_MIN;
> +	     r2++) {
> +
> +		/*
> +		 * VCO = N * Ref, that is: VCO = N * LC_FREQ / R
> +		 *
> +		 * Once again we want VCO_MIN <= VCO <= VCO_MAX.
> +		 * Injecting R2 = 2 * R and N2 = 2 * N, we get:
> +		 *   VCO_MAX * r2 > n2 * LC_FREQ and
> +		 *   VCO_MIN * r2 < n2 * LC_FREQ)
> +		 *
> +		 * Which means the desired boundaries for n2 are:
> +		 * VCO_MIN * r2 / LC_FREQ < n2 < VCO_MAX * r2 / LC_FREQ
> +		 */
> +		for (n2 = VCO_MIN * r2 / LC_FREQ + 1;
> +		     n2 <= VCO_MAX * r2 / LC_FREQ;
> +		     n2++) {
> +
> +			for (p = P_MIN; p <= P_MAX; p += P_INC)
> +				wrpll_update_rnp(freq2k, budget,
> +						 r2, n2, p, &best);
> +		}
> +	}
>  
> -	if (wrpll_tmds_clock_table[i].clock != clock)
> -		DRM_INFO("WRPLL: using settings for %dKHz on %dKHz mode\n",
> -			 wrpll_tmds_clock_table[i].clock, clock);
> +	*n2_out = best.n2;
> +	*p_out = best.p;
> +	*r2_out = best.r2;
>  
> -	DRM_DEBUG_KMS("WRPLL: %dKHz refresh rate with p=%d, n2=%d r2=%d\n",
> -		      clock, *p, *n2, *r2);
> +	DRM_DEBUG_KMS("WRPLL: %dHz refresh rate with p=%d, n2=%d r2=%d\n",
> +		      clock, *p_out, *n2_out, *r2_out);
>  }
>  
>  bool intel_ddi_pll_mode_set(struct drm_crtc *crtc, int clock)
> @@ -851,7 +662,7 @@ bool intel_ddi_pll_mode_set(struct drm_crtc *crtc, int clock)
>  		return true;
>  
>  	} else if (type == INTEL_OUTPUT_HDMI) {
> -		int p, n2, r2;
> +		unsigned p, n2, r2;
>  
>  		if (plls->wrpll1_refcount == 0) {
>  			DRM_DEBUG_KMS("Using WRPLL 1 on pipe %c\n",
> @@ -873,7 +684,7 @@ bool intel_ddi_pll_mode_set(struct drm_crtc *crtc, int clock)
>  		WARN(I915_READ(reg) & WRPLL_PLL_ENABLE,
>  		     "WRPLL already enabled\n");
>  
> -		intel_ddi_calculate_wrpll(clock, &p, &n2, &r2);
> +		intel_ddi_calculate_wrpll(clock * 1000, &r2, &n2, &p);
>  
>  		val = WRPLL_PLL_ENABLE | WRPLL_PLL_SELECT_LCPLL_2700 |
>  		      WRPLL_DIVIDER_REFERENCE(r2) | WRPLL_DIVIDER_FEEDBACK(n2) |
> -- 
> 1.8.1.4
> 
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx at lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/intel-gfx

-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch


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