[PATCH v2 1/2] drm/i915/bxt: Port PLL programming BUN

[PATCH v2 1/2] drm/i915/bxt: Port PLL programming BUN

[Vandana Kannan]

BUN 1: prop_coeff, int_coeff, tdctargetcnt programming updated and tied to
VCO frequencies. Program i_lockthresh in PORT_PLL_9.

VCO calculated based on the formula:
Desired Output = Port bit rate in MHz (DisplayPort HBR2 is 5400 MHz)
Fast Clock = Desired Output / 2
VCO = Fast Clock * P1 * P2

Prop_coeff, int_coeff, and tdctargetcnt modified according to above
calculation.

BUN 2: Port PLLs require additional programming at certain frequencies -
DCO amplitude in PORT_PLL_10

Review comments from Siva which were addressed in the initial version of the
patch.
	- Change PORT_PLL_LOCK_THRESHOLD to PORT_PLL_LOCK_THRESHOLD_MASK
	- Calculate for HDMI
	- Correct values for vco = 5.4
	- return in case of invalid vco range

v2: Imre's review comments addressed
	- change dcoampovr_en to dcoampovr_en_h
	- change PORT_PLL_DCO_AMP_OVR_EN to PORT_PLL_DCO_AMP_OVR_EN_H
	- Correct lane stagger value for 324MHz
	- Make coef common for HDMI and DP
	- remove superfluous comments

Signed-off-by: Vandana Kannan <vandana.kannan@intel.com>
Reviewed-by: Sivakumar Thulasimani <sivakumar.thulasimani@intel.com>
Cc: Sivakumar Thulasimani <sivakumar.thulasimani@intel.com>
---
 drivers/gpu/drm/i915/i915_drv.h  |  2 +-
 drivers/gpu/drm/i915/i915_reg.h  |  6 ++++
 drivers/gpu/drm/i915/intel_ddi.c | 69 ++++++++++++++++++++++++++++++----------
 3 files changed, 60 insertions(+), 17 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 136d42a..05a4e1c 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -304,7 +304,7 @@ struct intel_dpll_hw_state {
 	uint32_t cfgcr1, cfgcr2;
 
 	/* bxt */
-	uint32_t ebb0, pll0, pll1, pll2, pll3, pll6, pll8, pcsdw12;
+	uint32_t ebb0, pll0, pll1, pll2, pll3, pll6, pll8, pll10, pcsdw12;
 };
 
 struct intel_shared_dpll_config {
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 1b31238..b086d26 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -1185,6 +1185,12 @@ enum skl_disp_power_wells {
 #define   PORT_PLL_GAIN_CTL(x)		((x)  << 16)
 /* PORT_PLL_8_A */
 #define   PORT_PLL_TARGET_CNT_MASK	0x3FF
+/* PORT_PLL_9_A */
+#define  PORT_PLL_LOCK_THRESHOLD_MASK	0xe
+/* PORT_PLL_10_A */
+#define  PORT_PLL_DCO_AMP_OVR_EN_H	(1<<27)
+#define  PORT_PLL_DCO_AMP_MASK		0x3c00
+#define  PORT_PLL_DCO_AMP(x)		(x<<10)
 #define _PORT_PLL_BASE(port)		_PORT3(port, _PORT_PLL_0_A,	\
 						_PORT_PLL_0_B,		\
 						_PORT_PLL_0_C)
diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
index 9c1e74a..49b9fd8 100644
--- a/drivers/gpu/drm/i915/intel_ddi.c
+++ b/drivers/gpu/drm/i915/intel_ddi.c
@@ -1337,18 +1337,20 @@ struct bxt_clk_div {
 	uint32_t int_coef;
 	uint32_t gain_ctl;
 	uint32_t targ_cnt;
+	uint32_t dcoampovr_en_h;
+	uint32_t dco_amp;
 	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, 5, 11, 2, 9, 0xd},
-	/* 270 */ {4, 1, 27,       0, 0, 1, 3,  8, 1, 9, 0xd},
-	/* 540 */ {2, 1, 27,       0, 0, 1, 3,  8, 1, 9, 0x18},
-	/* 216 */ {3, 2, 32, 1677722, 1, 1, 5, 11, 2, 9, 0xd},
-	/* 243 */ {4, 1, 24, 1258291, 1, 1, 5, 11, 2, 9, 0xd},
-	/* 324 */ {4, 1, 32, 1677722, 1, 1, 5, 11, 2, 9, 0xd},
-	/* 432 */ {3, 1, 32, 1677722, 1, 1, 5, 11, 2, 9, 0x18}
+	/* 162 */ {4, 2, 32, 1677722, 1, 1, 4, 9, 3, 8, 0, 15, 0xd},
+	/* 270 */ {4, 1, 27,       0, 0, 1, 3,  8, 1, 9, 0, 15, 0xd},
+	/* 540 */ {2, 1, 27,       0, 0, 1, 3,  8, 1, 9, 0, 15, 0x18},
+	/* 216 */ {3, 2, 32, 1677722, 1, 1, 4, 9, 3, 8, 0, 15, 0xd},
+	/* 243 */ {4, 1, 24, 1258291, 1, 1, 5, 11, 3, 9, 1, 15, 0xd},
+	/* 324 */ {4, 1, 32, 1677722, 1, 1, 4, 9, 3, 8, 0, 15, 0x18},
+	/* 432 */ {3, 1, 32, 1677722, 1, 1, 4, 9, 3, 8, 0, 15, 0x18}
 };
 
 static bool
@@ -1359,6 +1361,7 @@ bxt_ddi_pll_select(struct intel_crtc *intel_crtc,
 {
 	struct intel_shared_dpll *pll;
 	struct bxt_clk_div clk_div = {0};
+	int vco = 0;
 
 	if (intel_encoder->type == INTEL_OUTPUT_HDMI) {
 		intel_clock_t best_clock;
@@ -1382,11 +1385,7 @@ bxt_ddi_pll_select(struct intel_crtc *intel_crtc,
 		clk_div.m2_frac = best_clock.m2 & ((1 << 22) - 1);
 		clk_div.m2_frac_en = clk_div.m2_frac != 0;
 
-		/* FIXME: set coef, gain, targcnt based on freq band */
-		clk_div.prop_coef = 5;
-		clk_div.int_coef = 11;
-		clk_div.gain_ctl = 2;
-		clk_div.targ_cnt = 9;
+		vco = best_clock.vco;
 		if (clock > 270000)
 			clk_div.lanestagger = 0x18;
 		else if (clock > 135000)
@@ -1416,6 +1415,32 @@ bxt_ddi_pll_select(struct intel_crtc *intel_crtc,
 			clk_div = bxt_dp_clk_val[0];
 			DRM_ERROR("Unknown link rate\n");
 		}
+		vco = clock * 10 / 2 * clk_div.p1 * clk_div.p2;
+	}
+
+	clk_div.dco_amp = 15;
+	clk_div.dcoampovr_en_h = 0;
+	if (vco >= 6200000 && vco <= 6480000) {
+		clk_div.prop_coef = 4;
+		clk_div.int_coef = 9;
+		clk_div.gain_ctl = 3;
+		clk_div.targ_cnt = 8;
+	} else if ((vco > 5400000 && vco < 6200000) ||
+			(vco >= 4800000 && vco < 5400000)) {
+		clk_div.prop_coef = 5;
+		clk_div.int_coef = 11;
+		clk_div.gain_ctl = 3;
+		clk_div.targ_cnt = 9;
+		if (vco >= 4800000 && vco < 5400000)
+			clk_div.dcoampovr_en_h = 1;
+	} else if (vco == 5400000) {
+		clk_div.prop_coef = 3;
+		clk_div.int_coef = 8;
+		clk_div.gain_ctl = 1;
+		clk_div.targ_cnt = 9;
+	} else {
+		DRM_ERROR("Invalid VCO\n");
+		return false;
 	}
 
 	crtc_state->dpll_hw_state.ebb0 =
@@ -1435,6 +1460,11 @@ bxt_ddi_pll_select(struct intel_crtc *intel_crtc,
 
 	crtc_state->dpll_hw_state.pll8 = clk_div.targ_cnt;
 
+	if (clk_div.dcoampovr_en_h)
+		crtc_state->dpll_hw_state.pll10 = PORT_PLL_DCO_AMP_OVR_EN_H;
+
+	crtc_state->dpll_hw_state.pll10 |= PORT_PLL_DCO_AMP(clk_div.dco_amp);
+
 	crtc_state->dpll_hw_state.pcsdw12 =
 		LANESTAGGER_STRAP_OVRD | clk_div.lanestagger;
 
@@ -2366,10 +2396,16 @@ static void bxt_ddi_pll_enable(struct drm_i915_private *dev_priv,
 	temp |= pll->config.hw_state.pll8;
 	I915_WRITE(BXT_PORT_PLL(port, 8), temp);
 
-	/*
-	 * FIXME: program PORT_PLL_9/i_lockthresh according to the latest
-	 * specification update.
-	 */
+	temp = I915_READ(BXT_PORT_PLL(port, 9));
+	temp &= ~PORT_PLL_LOCK_THRESHOLD_MASK;
+	temp |= (5 << 1);
+	I915_WRITE(BXT_PORT_PLL(port, 9), temp);
+
+	temp = I915_READ(BXT_PORT_PLL(port, 10));
+	temp &= ~PORT_PLL_DCO_AMP_OVR_EN_H;
+	temp &= ~PORT_PLL_DCO_AMP_MASK;
+	temp |= pll->config.hw_state.pll10;
+	I915_WRITE(BXT_PORT_PLL(port, 10), temp);
 
 	/* Recalibrate with new settings */
 	temp = I915_READ(BXT_PORT_PLL_EBB_4(port));
@@ -2433,6 +2469,7 @@ static bool bxt_ddi_pll_get_hw_state(struct drm_i915_private *dev_priv,
 	hw_state->pll3 = I915_READ(BXT_PORT_PLL(port, 3));
 	hw_state->pll6 = I915_READ(BXT_PORT_PLL(port, 6));
 	hw_state->pll8 = I915_READ(BXT_PORT_PLL(port, 8));
+	hw_state->pll10 = I915_READ(BXT_PORT_PLL(port, 10));
 	/*
 	 * While we write to the group register to program all lanes at once we
 	 * can read only lane registers. We configure all lanes the same way, so
-- 
2.0.1

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[PATCH 2/2] drm/i915/bxt: Move around lane stagger calculation

[Vandana Kannan]

Making lane stagger calculation common for HDMI and DP

Signed-off-by: Vandana Kannan <vandana.kannan@intel.com>
---
 drivers/gpu/drm/i915/intel_ddi.c | 21 +++++++++++----------
 1 file changed, 11 insertions(+), 10 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
index 49b9fd8..144d544 100644
--- a/drivers/gpu/drm/i915/intel_ddi.c
+++ b/drivers/gpu/drm/i915/intel_ddi.c
@@ -1386,16 +1386,6 @@ 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;
@@ -1443,6 +1433,17 @@ bxt_ddi_pll_select(struct intel_crtc *intel_crtc,
 		return false;
 	}
 
+	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;
+
 	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;
-- 
2.0.1

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Re: [PATCH v2 1/2] drm/i915/bxt: Port PLL programming BUN

[Imre Deak]

On to, 2015-05-07 at 12:00 +0530, Vandana Kannan wrote:
> BUN 1: prop_coeff, int_coeff, tdctargetcnt programming updated and tied to
> VCO frequencies. Program i_lockthresh in PORT_PLL_9.
> 
> VCO calculated based on the formula:
> Desired Output = Port bit rate in MHz (DisplayPort HBR2 is 5400 MHz)
> Fast Clock = Desired Output / 2
> VCO = Fast Clock * P1 * P2
> 
> Prop_coeff, int_coeff, and tdctargetcnt modified according to above
> calculation.
> 
> BUN 2: Port PLLs require additional programming at certain frequencies -
> DCO amplitude in PORT_PLL_10
> 
> Review comments from Siva which were addressed in the initial version of the
> patch.
> 	- Change PORT_PLL_LOCK_THRESHOLD to PORT_PLL_LOCK_THRESHOLD_MASK
> 	- Calculate for HDMI
> 	- Correct values for vco = 5.4
> 	- return in case of invalid vco range
> 
> v2: Imre's review comments addressed
> 	- change dcoampovr_en to dcoampovr_en_h
> 	- change PORT_PLL_DCO_AMP_OVR_EN to PORT_PLL_DCO_AMP_OVR_EN_H
> 	- Correct lane stagger value for 324MHz
> 	- Make coef common for HDMI and DP
> 	- remove superfluous comments
> 
> Signed-off-by: Vandana Kannan <vandana.kannan@intel.com>
> Reviewed-by: Sivakumar Thulasimani <sivakumar.thulasimani@intel.com>
> Cc: Sivakumar Thulasimani <sivakumar.thulasimani@intel.com>
> ---
>  drivers/gpu/drm/i915/i915_drv.h  |  2 +-
>  drivers/gpu/drm/i915/i915_reg.h  |  6 ++++
>  drivers/gpu/drm/i915/intel_ddi.c | 69 ++++++++++++++++++++++++++++++----------
>  3 files changed, 60 insertions(+), 17 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index 136d42a..05a4e1c 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -304,7 +304,7 @@ struct intel_dpll_hw_state {
>  	uint32_t cfgcr1, cfgcr2;
>  
>  	/* bxt */
> -	uint32_t ebb0, pll0, pll1, pll2, pll3, pll6, pll8, pcsdw12;
> +	uint32_t ebb0, pll0, pll1, pll2, pll3, pll6, pll8, pll10, pcsdw12;
>  };
>  
>  struct intel_shared_dpll_config {
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index 1b31238..b086d26 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -1185,6 +1185,12 @@ enum skl_disp_power_wells {
>  #define   PORT_PLL_GAIN_CTL(x)		((x)  << 16)
>  /* PORT_PLL_8_A */
>  #define   PORT_PLL_TARGET_CNT_MASK	0x3FF
> +/* PORT_PLL_9_A */
> +#define  PORT_PLL_LOCK_THRESHOLD_MASK	0xe
> +/* PORT_PLL_10_A */
> +#define  PORT_PLL_DCO_AMP_OVR_EN_H	(1<<27)
> +#define  PORT_PLL_DCO_AMP_MASK		0x3c00
> +#define  PORT_PLL_DCO_AMP(x)		(x<<10)
>  #define _PORT_PLL_BASE(port)		_PORT3(port, _PORT_PLL_0_A,	\
>  						_PORT_PLL_0_B,		\
>  						_PORT_PLL_0_C)
> diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
> index 9c1e74a..49b9fd8 100644
> --- a/drivers/gpu/drm/i915/intel_ddi.c
> +++ b/drivers/gpu/drm/i915/intel_ddi.c
> @@ -1337,18 +1337,20 @@ struct bxt_clk_div {
>  	uint32_t int_coef;
>  	uint32_t gain_ctl;
>  	uint32_t targ_cnt;
> +	uint32_t dcoampovr_en_h;
> +	uint32_t dco_amp;
>  	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, 5, 11, 2, 9, 0xd},
> -	/* 270 */ {4, 1, 27,       0, 0, 1, 3,  8, 1, 9, 0xd},
> -	/* 540 */ {2, 1, 27,       0, 0, 1, 3,  8, 1, 9, 0x18},
> -	/* 216 */ {3, 2, 32, 1677722, 1, 1, 5, 11, 2, 9, 0xd},
> -	/* 243 */ {4, 1, 24, 1258291, 1, 1, 5, 11, 2, 9, 0xd},
> -	/* 324 */ {4, 1, 32, 1677722, 1, 1, 5, 11, 2, 9, 0xd},
> -	/* 432 */ {3, 1, 32, 1677722, 1, 1, 5, 11, 2, 9, 0x18}
> +	/* 162 */ {4, 2, 32, 1677722, 1, 1, 4, 9, 3, 8, 0, 15, 0xd},
> +	/* 270 */ {4, 1, 27,       0, 0, 1, 3,  8, 1, 9, 0, 15, 0xd},
> +	/* 540 */ {2, 1, 27,       0, 0, 1, 3,  8, 1, 9, 0, 15, 0x18},
> +	/* 216 */ {3, 2, 32, 1677722, 1, 1, 4, 9, 3, 8, 0, 15, 0xd},
> +	/* 243 */ {4, 1, 24, 1258291, 1, 1, 5, 11, 3, 9, 1, 15, 0xd},
> +	/* 324 */ {4, 1, 32, 1677722, 1, 1, 4, 9, 3, 8, 0, 15, 0x18},
> +	/* 432 */ {3, 1, 32, 1677722, 1, 1, 4, 9, 3, 8, 0, 15, 0x18}

We calculate all of prop_coef, int_coef, gain_ctl, targ_cnt,
dcoapovr_en_h, dco_amp, so no need to have fixed values for these. The
corresponding fields should be removed from bxt_clk_div and replaced
with local vars in bxt_ddi_pll_select.

>  };
>  
>  static bool
> @@ -1359,6 +1361,7 @@ bxt_ddi_pll_select(struct intel_crtc *intel_crtc,
>  {
>  	struct intel_shared_dpll *pll;
>  	struct bxt_clk_div clk_div = {0};
> +	int vco = 0;
>  
>  	if (intel_encoder->type == INTEL_OUTPUT_HDMI) {
>  		intel_clock_t best_clock;
> @@ -1382,11 +1385,7 @@ bxt_ddi_pll_select(struct intel_crtc *intel_crtc,
>  		clk_div.m2_frac = best_clock.m2 & ((1 << 22) - 1);
>  		clk_div.m2_frac_en = clk_div.m2_frac != 0;
>  
> -		/* FIXME: set coef, gain, targcnt based on freq band */
> -		clk_div.prop_coef = 5;
> -		clk_div.int_coef = 11;
> -		clk_div.gain_ctl = 2;
> -		clk_div.targ_cnt = 9;
> +		vco = best_clock.vco;
>  		if (clock > 270000)
>  			clk_div.lanestagger = 0x18;
>  		else if (clock > 135000)
> @@ -1416,6 +1415,32 @@ bxt_ddi_pll_select(struct intel_crtc *intel_crtc,
>  			clk_div = bxt_dp_clk_val[0];
>  			DRM_ERROR("Unknown link rate\n");
>  		}
> +		vco = clock * 10 / 2 * clk_div.p1 * clk_div.p2;
> +	}
> +
> +	clk_div.dco_amp = 15;
> +	clk_div.dcoampovr_en_h = 0;
> +	if (vco >= 6200000 && vco <= 6480000) {
> +		clk_div.prop_coef = 4;
> +		clk_div.int_coef = 9;
> +		clk_div.gain_ctl = 3;
> +		clk_div.targ_cnt = 8;
> +	} else if ((vco > 5400000 && vco < 6200000) ||
> +			(vco >= 4800000 && vco < 5400000)) {
> +		clk_div.prop_coef = 5;
> +		clk_div.int_coef = 11;
> +		clk_div.gain_ctl = 3;
> +		clk_div.targ_cnt = 9;
> +		if (vco >= 4800000 && vco < 5400000)
> +			clk_div.dcoampovr_en_h = 1;
> +	} else if (vco == 5400000) {
> +		clk_div.prop_coef = 3;
> +		clk_div.int_coef = 8;
> +		clk_div.gain_ctl = 1;
> +		clk_div.targ_cnt = 9;
> +	} else {
> +		DRM_ERROR("Invalid VCO\n");
> +		return false;
>  	}
>  
>  	crtc_state->dpll_hw_state.ebb0 =
> @@ -1435,6 +1460,11 @@ bxt_ddi_pll_select(struct intel_crtc *intel_crtc,
>  
>  	crtc_state->dpll_hw_state.pll8 = clk_div.targ_cnt;
>  
> +	if (clk_div.dcoampovr_en_h)
> +		crtc_state->dpll_hw_state.pll10 = PORT_PLL_DCO_AMP_OVR_EN_H;
> +
> +	crtc_state->dpll_hw_state.pll10 |= PORT_PLL_DCO_AMP(clk_div.dco_amp);
> +
>  	crtc_state->dpll_hw_state.pcsdw12 =
>  		LANESTAGGER_STRAP_OVRD | clk_div.lanestagger;
>  
> @@ -2366,10 +2396,16 @@ static void bxt_ddi_pll_enable(struct drm_i915_private *dev_priv,
>  	temp |= pll->config.hw_state.pll8;
>  	I915_WRITE(BXT_PORT_PLL(port, 8), temp);
>  
> -	/*
> -	 * FIXME: program PORT_PLL_9/i_lockthresh according to the latest
> -	 * specification update.
> -	 */
> +	temp = I915_READ(BXT_PORT_PLL(port, 9));
> +	temp &= ~PORT_PLL_LOCK_THRESHOLD_MASK;
> +	temp |= (5 << 1);
> +	I915_WRITE(BXT_PORT_PLL(port, 9), temp);
> +
> +	temp = I915_READ(BXT_PORT_PLL(port, 10));
> +	temp &= ~PORT_PLL_DCO_AMP_OVR_EN_H;
> +	temp &= ~PORT_PLL_DCO_AMP_MASK;
> +	temp |= pll->config.hw_state.pll10;
> +	I915_WRITE(BXT_PORT_PLL(port, 10), temp);
>  
>  	/* Recalibrate with new settings */
>  	temp = I915_READ(BXT_PORT_PLL_EBB_4(port));
> @@ -2433,6 +2469,7 @@ static bool bxt_ddi_pll_get_hw_state(struct drm_i915_private *dev_priv,
>  	hw_state->pll3 = I915_READ(BXT_PORT_PLL(port, 3));
>  	hw_state->pll6 = I915_READ(BXT_PORT_PLL(port, 6));
>  	hw_state->pll8 = I915_READ(BXT_PORT_PLL(port, 8));
> +	hw_state->pll10 = I915_READ(BXT_PORT_PLL(port, 10));
>  	/*
>  	 * While we write to the group register to program all lanes at once we
>  	 * can read only lane registers. We configure all lanes the same way, so


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Re: [PATCH 2/2] drm/i915/bxt: Move around lane stagger calculation

[Imre Deak]

On to, 2015-05-07 at 12:00 +0530, Vandana Kannan wrote:
> Making lane stagger calculation common for HDMI and DP
> 
> Signed-off-by: Vandana Kannan <vandana.kannan@intel.com>
> ---
>  drivers/gpu/drm/i915/intel_ddi.c | 21 +++++++++++----------
>  1 file changed, 11 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
> index 49b9fd8..144d544 100644
> --- a/drivers/gpu/drm/i915/intel_ddi.c
> +++ b/drivers/gpu/drm/i915/intel_ddi.c
> @@ -1386,16 +1386,6 @@ 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;
> @@ -1443,6 +1433,17 @@ bxt_ddi_pll_select(struct intel_crtc *intel_crtc,
>  		return false;
>  	}
>  
> +	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;
> +

Here as in patch 1/2 we don't need to have fixed values for lanestagger
any more, so you can remove it from  bxt_clk_div and use a local var
instead.

>  	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;


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Re: [PATCH 2/2] drm/i915/bxt: Move around lane stagger calculation

[shuang.he]

Tested-By: Intel Graphics QA PRTS (Patch Regression Test System Contact: shuang.he@intel.com)
Task id: 6340
-------------------------------------Summary-------------------------------------
Platform          Delta          drm-intel-nightly          Series Applied
PNV                                  276/276              276/276
ILK                                  302/302              302/302
SNB                                  316/316              316/316
IVB                                  342/342              342/342
BYT                                  286/286              286/286
BDW                                  321/321              321/321
-------------------------------------Detailed-------------------------------------
Platform  Test                                drm-intel-nightly          Series Applied
Note: You need to pay more attention to line start with '*'
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Re: [PATCH v2 1/2] drm/i915/bxt: Port PLL programming BUN

[Kannan, Vandana]

On 5/7/2015 2:57 PM, Imre Deak wrote:
> On to, 2015-05-07 at 12:00 +0530, Vandana Kannan wrote:
>> BUN 1: prop_coeff, int_coeff, tdctargetcnt programming updated and tied to
>> VCO frequencies. Program i_lockthresh in PORT_PLL_9.
>>
>> VCO calculated based on the formula:
>> Desired Output = Port bit rate in MHz (DisplayPort HBR2 is 5400 MHz)
>> Fast Clock = Desired Output / 2
>> VCO = Fast Clock * P1 * P2
>>
>> Prop_coeff, int_coeff, and tdctargetcnt modified according to above
>> calculation.
>>
>> BUN 2: Port PLLs require additional programming at certain frequencies -
>> DCO amplitude in PORT_PLL_10
>>
>> Review comments from Siva which were addressed in the initial version of the
>> patch.
>> 	- Change PORT_PLL_LOCK_THRESHOLD to PORT_PLL_LOCK_THRESHOLD_MASK
>> 	- Calculate for HDMI
>> 	- Correct values for vco = 5.4
>> 	- return in case of invalid vco range
>>
>> v2: Imre's review comments addressed
>> 	- change dcoampovr_en to dcoampovr_en_h
>> 	- change PORT_PLL_DCO_AMP_OVR_EN to PORT_PLL_DCO_AMP_OVR_EN_H
>> 	- Correct lane stagger value for 324MHz
>> 	- Make coef common for HDMI and DP
>> 	- remove superfluous comments
>>
>> Signed-off-by: Vandana Kannan <vandana.kannan@intel.com>
>> Reviewed-by: Sivakumar Thulasimani <sivakumar.thulasimani@intel.com>
>> Cc: Sivakumar Thulasimani <sivakumar.thulasimani@intel.com>
>> ---
>>   drivers/gpu/drm/i915/i915_drv.h  |  2 +-
>>   drivers/gpu/drm/i915/i915_reg.h  |  6 ++++
>>   drivers/gpu/drm/i915/intel_ddi.c | 69 ++++++++++++++++++++++++++++++----------
>>   3 files changed, 60 insertions(+), 17 deletions(-)

[...]

>>   /* pre-calculated values for DP linkrates */
>>   static struct bxt_clk_div bxt_dp_clk_val[7] = {
>> -	/* 162 */ {4, 2, 32, 1677722, 1, 1, 5, 11, 2, 9, 0xd},
>> -	/* 270 */ {4, 1, 27,       0, 0, 1, 3,  8, 1, 9, 0xd},
>> -	/* 540 */ {2, 1, 27,       0, 0, 1, 3,  8, 1, 9, 0x18},
>> -	/* 216 */ {3, 2, 32, 1677722, 1, 1, 5, 11, 2, 9, 0xd},
>> -	/* 243 */ {4, 1, 24, 1258291, 1, 1, 5, 11, 2, 9, 0xd},
>> -	/* 324 */ {4, 1, 32, 1677722, 1, 1, 5, 11, 2, 9, 0xd},
>> -	/* 432 */ {3, 1, 32, 1677722, 1, 1, 5, 11, 2, 9, 0x18}
>> +	/* 162 */ {4, 2, 32, 1677722, 1, 1, 4, 9, 3, 8, 0, 15, 0xd},
>> +	/* 270 */ {4, 1, 27,       0, 0, 1, 3,  8, 1, 9, 0, 15, 0xd},
>> +	/* 540 */ {2, 1, 27,       0, 0, 1, 3,  8, 1, 9, 0, 15, 0x18},
>> +	/* 216 */ {3, 2, 32, 1677722, 1, 1, 4, 9, 3, 8, 0, 15, 0xd},
>> +	/* 243 */ {4, 1, 24, 1258291, 1, 1, 5, 11, 3, 9, 1, 15, 0xd},
>> +	/* 324 */ {4, 1, 32, 1677722, 1, 1, 4, 9, 3, 8, 0, 15, 0x18},
>> +	/* 432 */ {3, 1, 32, 1677722, 1, 1, 4, 9, 3, 8, 0, 15, 0x18}
>
> We calculate all of prop_coef, int_coef, gain_ctl, targ_cnt,
> dcoapovr_en_h, dco_amp, so no need to have fixed values for these. The
> corresponding fields should be removed from bxt_clk_div and replaced
> with local vars in bxt_ddi_pll_select.
>
Agree.
Made changes separately and thought of sending as another patch a little 
later, but I'll include the changes in this patch and resend.

Thanks,
Vandana
>>   };
>>
>>   static bool
>> @@ -1359,6 +1361,7 @@ bxt_ddi_pll_select(struct intel_crtc *intel_crtc,
>>   {
>>   	struct intel_shared_dpll *pll;
>>   	struct bxt_clk_div clk_div = {0};
>> +	int vco = 0;
>>
>>   	if (intel_encoder->type == INTEL_OUTPUT_HDMI) {
>>   		intel_clock_t best_clock;
>> @@ -1382,11 +1385,7 @@ bxt_ddi_pll_select(struct intel_crtc *intel_crtc,
>>   		clk_div.m2_frac = best_clock.m2 & ((1 << 22) - 1);
>>   		clk_div.m2_frac_en = clk_div.m2_frac != 0;
>>
>> -		/* FIXME: set coef, gain, targcnt based on freq band */
>> -		clk_div.prop_coef = 5;
>> -		clk_div.int_coef = 11;
>> -		clk_div.gain_ctl = 2;
>> -		clk_div.targ_cnt = 9;
>> +		vco = best_clock.vco;
>>   		if (clock > 270000)
>>   			clk_div.lanestagger = 0x18;
>>   		else if (clock > 135000)
>> @@ -1416,6 +1415,32 @@ bxt_ddi_pll_select(struct intel_crtc *intel_crtc,
>>   			clk_div = bxt_dp_clk_val[0];
>>   			DRM_ERROR("Unknown link rate\n");
>>   		}
>> +		vco = clock * 10 / 2 * clk_div.p1 * clk_div.p2;
>> +	}
>> +

[...]

>>   	/* Recalibrate with new settings */
>>   	temp = I915_READ(BXT_PORT_PLL_EBB_4(port));
>> @@ -2433,6 +2469,7 @@ static bool bxt_ddi_pll_get_hw_state(struct drm_i915_private *dev_priv,
>>   	hw_state->pll3 = I915_READ(BXT_PORT_PLL(port, 3));
>>   	hw_state->pll6 = I915_READ(BXT_PORT_PLL(port, 6));
>>   	hw_state->pll8 = I915_READ(BXT_PORT_PLL(port, 8));
>> +	hw_state->pll10 = I915_READ(BXT_PORT_PLL(port, 10));
>>   	/*
>>   	 * While we write to the group register to program all lanes at once we
>>   	 * can read only lane registers. We configure all lanes the same way, so
>
>
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[PATCH v3 1/2] drm/i915/bxt: Port PLL programming BUN

[Vandana Kannan]

BUN 1: prop_coeff, int_coeff, tdctargetcnt programming updated and tied to
VCO frequencies. Program i_lockthresh in PORT_PLL_9.

VCO calculated based on the formula:
Desired Output = Port bit rate in MHz (DisplayPort HBR2 is 5400 MHz)
Fast Clock = Desired Output / 2
VCO = Fast Clock * P1 * P2

Prop_coeff, int_coeff, and tdctargetcnt modified according to above
calculation.

BUN 2: Port PLLs require additional programming at certain frequencies -
DCO amplitude in PORT_PLL_10

Review comments from Siva which were addressed in the initial version of the
patch.
	- Change PORT_PLL_LOCK_THRESHOLD to PORT_PLL_LOCK_THRESHOLD_MASK
	- Calculate for HDMI
	- Correct values for vco = 5.4
	- return in case of invalid vco range

v2: Imre's review comments addressed
	- change dcoampovr_en to dcoampovr_en_h
	- change PORT_PLL_DCO_AMP_OVR_EN to PORT_PLL_DCO_AMP_OVR_EN_H
	- Correct lane stagger value for 324MHz
	- Make coef common for HDMI and DP
	- remove superfluous comments

v3: Imre's comments addressed
	- Remove Prop_coeff, int_coeff, tdctargetcnt, dcoampovr_en, gain_ctl,
	dcoampovr_en_h from bxt_clk_div and make them local variables.

Signed-off-by: Vandana Kannan <vandana.kannan@intel.com>
Reviewed-by: Sivakumar Thulasimani <sivakumar.thulasimani@intel.com> [v1]
Cc: Sivakumar Thulasimani <sivakumar.thulasimani@intel.com>
---
 drivers/gpu/drm/i915/i915_drv.h  |  2 +-
 drivers/gpu/drm/i915/i915_reg.h  |  6 +++
 drivers/gpu/drm/i915/intel_ddi.c | 79 ++++++++++++++++++++++++++++------------
 3 files changed, 63 insertions(+), 24 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 136d42a..05a4e1c 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -304,7 +304,7 @@ struct intel_dpll_hw_state {
 	uint32_t cfgcr1, cfgcr2;
 
 	/* bxt */
-	uint32_t ebb0, pll0, pll1, pll2, pll3, pll6, pll8, pcsdw12;
+	uint32_t ebb0, pll0, pll1, pll2, pll3, pll6, pll8, pll10, pcsdw12;
 };
 
 struct intel_shared_dpll_config {
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 1b31238..b086d26 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -1185,6 +1185,12 @@ enum skl_disp_power_wells {
 #define   PORT_PLL_GAIN_CTL(x)		((x)  << 16)
 /* PORT_PLL_8_A */
 #define   PORT_PLL_TARGET_CNT_MASK	0x3FF
+/* PORT_PLL_9_A */
+#define  PORT_PLL_LOCK_THRESHOLD_MASK	0xe
+/* PORT_PLL_10_A */
+#define  PORT_PLL_DCO_AMP_OVR_EN_H	(1<<27)
+#define  PORT_PLL_DCO_AMP_MASK		0x3c00
+#define  PORT_PLL_DCO_AMP(x)		(x<<10)
 #define _PORT_PLL_BASE(port)		_PORT3(port, _PORT_PLL_0_A,	\
 						_PORT_PLL_0_B,		\
 						_PORT_PLL_0_C)
diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
index 9c1e74a..a56613c 100644
--- a/drivers/gpu/drm/i915/intel_ddi.c
+++ b/drivers/gpu/drm/i915/intel_ddi.c
@@ -1333,22 +1333,18 @@ struct bxt_clk_div {
 	uint32_t m2_frac;
 	bool m2_frac_en;
 	uint32_t n;
-	uint32_t prop_coef;
-	uint32_t int_coef;
-	uint32_t gain_ctl;
-	uint32_t targ_cnt;
 	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, 5, 11, 2, 9, 0xd},
-	/* 270 */ {4, 1, 27,       0, 0, 1, 3,  8, 1, 9, 0xd},
-	/* 540 */ {2, 1, 27,       0, 0, 1, 3,  8, 1, 9, 0x18},
-	/* 216 */ {3, 2, 32, 1677722, 1, 1, 5, 11, 2, 9, 0xd},
-	/* 243 */ {4, 1, 24, 1258291, 1, 1, 5, 11, 2, 9, 0xd},
-	/* 324 */ {4, 1, 32, 1677722, 1, 1, 5, 11, 2, 9, 0xd},
-	/* 432 */ {3, 1, 32, 1677722, 1, 1, 5, 11, 2, 9, 0x18}
+	/* 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}
 };
 
 static bool
@@ -1359,6 +1355,9 @@ bxt_ddi_pll_select(struct intel_crtc *intel_crtc,
 {
 	struct intel_shared_dpll *pll;
 	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;
 
 	if (intel_encoder->type == INTEL_OUTPUT_HDMI) {
 		intel_clock_t best_clock;
@@ -1382,11 +1381,7 @@ bxt_ddi_pll_select(struct intel_crtc *intel_crtc,
 		clk_div.m2_frac = best_clock.m2 & ((1 << 22) - 1);
 		clk_div.m2_frac_en = clk_div.m2_frac != 0;
 
-		/* FIXME: set coef, gain, targcnt based on freq band */
-		clk_div.prop_coef = 5;
-		clk_div.int_coef = 11;
-		clk_div.gain_ctl = 2;
-		clk_div.targ_cnt = 9;
+		vco = best_clock.vco;
 		if (clock > 270000)
 			clk_div.lanestagger = 0x18;
 		else if (clock > 135000)
@@ -1416,6 +1411,32 @@ bxt_ddi_pll_select(struct intel_crtc *intel_crtc,
 			clk_div = bxt_dp_clk_val[0];
 			DRM_ERROR("Unknown link rate\n");
 		}
+		vco = clock * 10 / 2 * clk_div.p1 * clk_div.p2;
+	}
+
+	dco_amp = 15;
+	dcoampovr_en_h = 0;
+	if (vco >= 6200000 && vco <= 6480000) {
+		prop_coef = 4;
+		int_coef = 9;
+		gain_ctl = 3;
+		targ_cnt = 8;
+	} else if ((vco > 5400000 && vco < 6200000) ||
+			(vco >= 4800000 && vco < 5400000)) {
+		prop_coef = 5;
+		int_coef = 11;
+		gain_ctl = 3;
+		targ_cnt = 9;
+		if (vco >= 4800000 && vco < 5400000)
+			dcoampovr_en_h = 1;
+	} else if (vco == 5400000) {
+		prop_coef = 3;
+		int_coef = 8;
+		gain_ctl = 1;
+		targ_cnt = 9;
+	} else {
+		DRM_ERROR("Invalid VCO\n");
+		return false;
 	}
 
 	crtc_state->dpll_hw_state.ebb0 =
@@ -1429,11 +1450,16 @@ bxt_ddi_pll_select(struct intel_crtc *intel_crtc,
 			PORT_PLL_M2_FRAC_ENABLE;
 
 	crtc_state->dpll_hw_state.pll6 =
-		clk_div.prop_coef | PORT_PLL_INT_COEFF(clk_div.int_coef);
+		prop_coef | PORT_PLL_INT_COEFF(int_coef);
 	crtc_state->dpll_hw_state.pll6 |=
-		PORT_PLL_GAIN_CTL(clk_div.gain_ctl);
+		PORT_PLL_GAIN_CTL(gain_ctl);
+
+	crtc_state->dpll_hw_state.pll8 = targ_cnt;
 
-	crtc_state->dpll_hw_state.pll8 = clk_div.targ_cnt;
+	if (dcoampovr_en_h)
+		crtc_state->dpll_hw_state.pll10 = PORT_PLL_DCO_AMP_OVR_EN_H;
+
+	crtc_state->dpll_hw_state.pll10 |= PORT_PLL_DCO_AMP(dco_amp);
 
 	crtc_state->dpll_hw_state.pcsdw12 =
 		LANESTAGGER_STRAP_OVRD | clk_div.lanestagger;
@@ -2366,10 +2392,16 @@ static void bxt_ddi_pll_enable(struct drm_i915_private *dev_priv,
 	temp |= pll->config.hw_state.pll8;
 	I915_WRITE(BXT_PORT_PLL(port, 8), temp);
 
-	/*
-	 * FIXME: program PORT_PLL_9/i_lockthresh according to the latest
-	 * specification update.
-	 */
+	temp = I915_READ(BXT_PORT_PLL(port, 9));
+	temp &= ~PORT_PLL_LOCK_THRESHOLD_MASK;
+	temp |= (5 << 1);
+	I915_WRITE(BXT_PORT_PLL(port, 9), temp);
+
+	temp = I915_READ(BXT_PORT_PLL(port, 10));
+	temp &= ~PORT_PLL_DCO_AMP_OVR_EN_H;
+	temp &= ~PORT_PLL_DCO_AMP_MASK;
+	temp |= pll->config.hw_state.pll10;
+	I915_WRITE(BXT_PORT_PLL(port, 10), temp);
 
 	/* Recalibrate with new settings */
 	temp = I915_READ(BXT_PORT_PLL_EBB_4(port));
@@ -2433,6 +2465,7 @@ static bool bxt_ddi_pll_get_hw_state(struct drm_i915_private *dev_priv,
 	hw_state->pll3 = I915_READ(BXT_PORT_PLL(port, 3));
 	hw_state->pll6 = I915_READ(BXT_PORT_PLL(port, 6));
 	hw_state->pll8 = I915_READ(BXT_PORT_PLL(port, 8));
+	hw_state->pll10 = I915_READ(BXT_PORT_PLL(port, 10));
 	/*
 	 * While we write to the group register to program all lanes at once we
 	 * can read only lane registers. We configure all lanes the same way, so
-- 
2.0.1

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

[Vandana Kannan]

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@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) {
-- 
2.0.1

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Re: [PATCH v3 1/2] drm/i915/bxt: Port PLL programming BUN

[Imre Deak]

On ke, 2015-05-13 at 12:18 +0530, Vandana Kannan wrote:
> BUN 1: prop_coeff, int_coeff, tdctargetcnt programming updated and tied to
> VCO frequencies. Program i_lockthresh in PORT_PLL_9.
> 
> VCO calculated based on the formula:
> Desired Output = Port bit rate in MHz (DisplayPort HBR2 is 5400 MHz)
> Fast Clock = Desired Output / 2
> VCO = Fast Clock * P1 * P2
> 
> Prop_coeff, int_coeff, and tdctargetcnt modified according to above
> calculation.
> 
> BUN 2: Port PLLs require additional programming at certain frequencies -
> DCO amplitude in PORT_PLL_10
> 
> Review comments from Siva which were addressed in the initial version of the
> patch.
> 	- Change PORT_PLL_LOCK_THRESHOLD to PORT_PLL_LOCK_THRESHOLD_MASK
> 	- Calculate for HDMI
> 	- Correct values for vco = 5.4
> 	- return in case of invalid vco range
> 
> v2: Imre's review comments addressed
> 	- change dcoampovr_en to dcoampovr_en_h
> 	- change PORT_PLL_DCO_AMP_OVR_EN to PORT_PLL_DCO_AMP_OVR_EN_H
> 	- Correct lane stagger value for 324MHz
> 	- Make coef common for HDMI and DP
> 	- remove superfluous comments
> 
> v3: Imre's comments addressed
> 	- Remove Prop_coeff, int_coeff, tdctargetcnt, dcoampovr_en, gain_ctl,
> 	dcoampovr_en_h from bxt_clk_div and make them local variables.
> 
> Signed-off-by: Vandana Kannan <vandana.kannan@intel.com>
> Reviewed-by: Sivakumar Thulasimani <sivakumar.thulasimani@intel.com> [v1]
> Cc: Sivakumar Thulasimani <sivakumar.thulasimani@intel.com>

Looks ok:
Reviewed-by: Imre Deak <imre.deak@intel.com>

> ---
>  drivers/gpu/drm/i915/i915_drv.h  |  2 +-
>  drivers/gpu/drm/i915/i915_reg.h  |  6 +++
>  drivers/gpu/drm/i915/intel_ddi.c | 79 ++++++++++++++++++++++++++++------------
>  3 files changed, 63 insertions(+), 24 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index 136d42a..05a4e1c 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -304,7 +304,7 @@ struct intel_dpll_hw_state {
>  	uint32_t cfgcr1, cfgcr2;
>  
>  	/* bxt */
> -	uint32_t ebb0, pll0, pll1, pll2, pll3, pll6, pll8, pcsdw12;
> +	uint32_t ebb0, pll0, pll1, pll2, pll3, pll6, pll8, pll10, pcsdw12;
>  };
>  
>  struct intel_shared_dpll_config {
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index 1b31238..b086d26 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -1185,6 +1185,12 @@ enum skl_disp_power_wells {
>  #define   PORT_PLL_GAIN_CTL(x)		((x)  << 16)
>  /* PORT_PLL_8_A */
>  #define   PORT_PLL_TARGET_CNT_MASK	0x3FF
> +/* PORT_PLL_9_A */
> +#define  PORT_PLL_LOCK_THRESHOLD_MASK	0xe
> +/* PORT_PLL_10_A */
> +#define  PORT_PLL_DCO_AMP_OVR_EN_H	(1<<27)
> +#define  PORT_PLL_DCO_AMP_MASK		0x3c00
> +#define  PORT_PLL_DCO_AMP(x)		(x<<10)
>  #define _PORT_PLL_BASE(port)		_PORT3(port, _PORT_PLL_0_A,	\
>  						_PORT_PLL_0_B,		\
>  						_PORT_PLL_0_C)
> diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
> index 9c1e74a..a56613c 100644
> --- a/drivers/gpu/drm/i915/intel_ddi.c
> +++ b/drivers/gpu/drm/i915/intel_ddi.c
> @@ -1333,22 +1333,18 @@ struct bxt_clk_div {
>  	uint32_t m2_frac;
>  	bool m2_frac_en;
>  	uint32_t n;
> -	uint32_t prop_coef;
> -	uint32_t int_coef;
> -	uint32_t gain_ctl;
> -	uint32_t targ_cnt;
>  	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, 5, 11, 2, 9, 0xd},
> -	/* 270 */ {4, 1, 27,       0, 0, 1, 3,  8, 1, 9, 0xd},
> -	/* 540 */ {2, 1, 27,       0, 0, 1, 3,  8, 1, 9, 0x18},
> -	/* 216 */ {3, 2, 32, 1677722, 1, 1, 5, 11, 2, 9, 0xd},
> -	/* 243 */ {4, 1, 24, 1258291, 1, 1, 5, 11, 2, 9, 0xd},
> -	/* 324 */ {4, 1, 32, 1677722, 1, 1, 5, 11, 2, 9, 0xd},
> -	/* 432 */ {3, 1, 32, 1677722, 1, 1, 5, 11, 2, 9, 0x18}
> +	/* 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}
>  };
>  
>  static bool
> @@ -1359,6 +1355,9 @@ bxt_ddi_pll_select(struct intel_crtc *intel_crtc,
>  {
>  	struct intel_shared_dpll *pll;
>  	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;
>  
>  	if (intel_encoder->type == INTEL_OUTPUT_HDMI) {
>  		intel_clock_t best_clock;
> @@ -1382,11 +1381,7 @@ bxt_ddi_pll_select(struct intel_crtc *intel_crtc,
>  		clk_div.m2_frac = best_clock.m2 & ((1 << 22) - 1);
>  		clk_div.m2_frac_en = clk_div.m2_frac != 0;
>  
> -		/* FIXME: set coef, gain, targcnt based on freq band */
> -		clk_div.prop_coef = 5;
> -		clk_div.int_coef = 11;
> -		clk_div.gain_ctl = 2;
> -		clk_div.targ_cnt = 9;
> +		vco = best_clock.vco;
>  		if (clock > 270000)
>  			clk_div.lanestagger = 0x18;
>  		else if (clock > 135000)
> @@ -1416,6 +1411,32 @@ bxt_ddi_pll_select(struct intel_crtc *intel_crtc,
>  			clk_div = bxt_dp_clk_val[0];
>  			DRM_ERROR("Unknown link rate\n");
>  		}
> +		vco = clock * 10 / 2 * clk_div.p1 * clk_div.p2;
> +	}
> +
> +	dco_amp = 15;
> +	dcoampovr_en_h = 0;
> +	if (vco >= 6200000 && vco <= 6480000) {
> +		prop_coef = 4;
> +		int_coef = 9;
> +		gain_ctl = 3;
> +		targ_cnt = 8;
> +	} else if ((vco > 5400000 && vco < 6200000) ||
> +			(vco >= 4800000 && vco < 5400000)) {
> +		prop_coef = 5;
> +		int_coef = 11;
> +		gain_ctl = 3;
> +		targ_cnt = 9;
> +		if (vco >= 4800000 && vco < 5400000)
> +			dcoampovr_en_h = 1;
> +	} else if (vco == 5400000) {
> +		prop_coef = 3;
> +		int_coef = 8;
> +		gain_ctl = 1;
> +		targ_cnt = 9;
> +	} else {
> +		DRM_ERROR("Invalid VCO\n");
> +		return false;
>  	}
>  
>  	crtc_state->dpll_hw_state.ebb0 =
> @@ -1429,11 +1450,16 @@ bxt_ddi_pll_select(struct intel_crtc *intel_crtc,
>  			PORT_PLL_M2_FRAC_ENABLE;
>  
>  	crtc_state->dpll_hw_state.pll6 =
> -		clk_div.prop_coef | PORT_PLL_INT_COEFF(clk_div.int_coef);
> +		prop_coef | PORT_PLL_INT_COEFF(int_coef);
>  	crtc_state->dpll_hw_state.pll6 |=
> -		PORT_PLL_GAIN_CTL(clk_div.gain_ctl);
> +		PORT_PLL_GAIN_CTL(gain_ctl);
> +
> +	crtc_state->dpll_hw_state.pll8 = targ_cnt;
>  
> -	crtc_state->dpll_hw_state.pll8 = clk_div.targ_cnt;
> +	if (dcoampovr_en_h)
> +		crtc_state->dpll_hw_state.pll10 = PORT_PLL_DCO_AMP_OVR_EN_H;
> +
> +	crtc_state->dpll_hw_state.pll10 |= PORT_PLL_DCO_AMP(dco_amp);
>  
>  	crtc_state->dpll_hw_state.pcsdw12 =
>  		LANESTAGGER_STRAP_OVRD | clk_div.lanestagger;
> @@ -2366,10 +2392,16 @@ static void bxt_ddi_pll_enable(struct drm_i915_private *dev_priv,
>  	temp |= pll->config.hw_state.pll8;
>  	I915_WRITE(BXT_PORT_PLL(port, 8), temp);
>  
> -	/*
> -	 * FIXME: program PORT_PLL_9/i_lockthresh according to the latest
> -	 * specification update.
> -	 */
> +	temp = I915_READ(BXT_PORT_PLL(port, 9));
> +	temp &= ~PORT_PLL_LOCK_THRESHOLD_MASK;
> +	temp |= (5 << 1);
> +	I915_WRITE(BXT_PORT_PLL(port, 9), temp);
> +
> +	temp = I915_READ(BXT_PORT_PLL(port, 10));
> +	temp &= ~PORT_PLL_DCO_AMP_OVR_EN_H;
> +	temp &= ~PORT_PLL_DCO_AMP_MASK;
> +	temp |= pll->config.hw_state.pll10;
> +	I915_WRITE(BXT_PORT_PLL(port, 10), temp);
>  
>  	/* Recalibrate with new settings */
>  	temp = I915_READ(BXT_PORT_PLL_EBB_4(port));
> @@ -2433,6 +2465,7 @@ static bool bxt_ddi_pll_get_hw_state(struct drm_i915_private *dev_priv,
>  	hw_state->pll3 = I915_READ(BXT_PORT_PLL(port, 3));
>  	hw_state->pll6 = I915_READ(BXT_PORT_PLL(port, 6));
>  	hw_state->pll8 = I915_READ(BXT_PORT_PLL(port, 8));
> +	hw_state->pll10 = I915_READ(BXT_PORT_PLL(port, 10));
>  	/*
>  	 * While we write to the group register to program all lanes at once we
>  	 * can read only lane registers. We configure all lanes the same way, so


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Re: [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@intel.com>

Reviewed-by: Imre Deak <imre.deak@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) {


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Re: [PATCH v2 2/2] drm/i915/bxt: Move around lane stagger calculation

[Daniel Vetter]

On Mon, May 18, 2015 at 07:28:04PM +0300, Imre Deak wrote:
> 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@intel.com>
> 
> Reviewed-by: Imre Deak <imre.deak@intel.com>

Both patches applied, thanks.
-Daniel

> 
> > ---
> >  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) {
> 
> 
> _______________________________________________
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> Intel-gfx@lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/intel-gfx

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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