[Intel-gfx] [PATCH v2] drm/i915/bxt: BUNs related to port PLL

[Vandana Kannan]

This patch contains changes based on 2 updates to the spec:
Port PLL VCO restriction raised up to 6700.
Port PLL now needs DCO amp override enable for all VCO frequencies.

v2: Sonika's review comment addressed
	- dcoampovr_en_h variable not required
Based on a discussion with Siva, the following changes have been made.
	- replace dco_amp var with #define BXT_DCO_AMPLITUDE
	- set pll10 in a single assignment

Signed-off-by: Vandana Kannan <vandana.kannan at intel.com>
---
 drivers/gpu/drm/i915/intel_ddi.c     | 16 ++++++----------
 drivers/gpu/drm/i915/intel_display.c |  2 +-
 2 files changed, 7 insertions(+), 11 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
index 42c1487..1eadc14 100644
--- a/drivers/gpu/drm/i915/intel_ddi.c
+++ b/drivers/gpu/drm/i915/intel_ddi.c
@@ -1445,6 +1445,8 @@ static const struct bxt_clk_div bxt_dp_clk_val[] = {
 	{432000, 3, 1, 32, 1677722, 1, 1}
 };
 
+#define BXT_DCO_AMPLITUDE	15
+
 static bool
 bxt_ddi_pll_select(struct intel_crtc *intel_crtc,
 		   struct intel_crtc_state *crtc_state,
@@ -1455,7 +1457,7 @@ 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, lanestagger;
+	uint32_t lanestagger;
 
 	if (intel_encoder->type == INTEL_OUTPUT_HDMI) {
 		intel_clock_t best_clock;
@@ -1494,9 +1496,7 @@ bxt_ddi_pll_select(struct intel_crtc *intel_crtc,
 		vco = clock * 10 / 2 * clk_div.p1 * clk_div.p2;
 	}
 
-	dco_amp = 15;
-	dcoampovr_en_h = 0;
-	if (vco >= 6200000 && vco <= 6480000) {
+	if (vco >= 6200000 && vco <= 6700000) {
 		prop_coef = 4;
 		int_coef = 9;
 		gain_ctl = 3;
@@ -1507,8 +1507,6 @@ bxt_ddi_pll_select(struct intel_crtc *intel_crtc,
 		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;
@@ -1550,10 +1548,8 @@ bxt_ddi_pll_select(struct intel_crtc *intel_crtc,
 
 	crtc_state->dpll_hw_state.pll8 = 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.pll10 = PORT_PLL_DCO_AMP(BXT_DCO_AMPLITUDE)
+						| PORT_PLL_DCO_AMP_OVR_EN_H;
 
 	crtc_state->dpll_hw_state.pcsdw12 =
 		LANESTAGGER_STRAP_OVRD | lanestagger;
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index eb665d7..e04be45 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -409,7 +409,7 @@ static const intel_limit_t intel_limits_chv = {
 static const intel_limit_t intel_limits_bxt = {
 	/* FIXME: find real dot limits */
 	.dot = { .min = 0, .max = INT_MAX },
-	.vco = { .min = 4800000, .max = 6480000 },
+	.vco = { .min = 4800000, .max = 6700000 },
 	.n = { .min = 1, .max = 1 },
 	.m1 = { .min = 2, .max = 2 },
 	/* FIXME: find real m2 limits */
-- 
2.0.1