[Intel-gfx] [PATCH] drm/i915/bxt: Port PLL programming BUN
Vandana Kannan
vandana.kannan at intel.com
Mon May 4 08:20:21 PDT 2015
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
Signed-off-by: Vandana Kannan <vandana.kannan at intel.com>
Cc: Sivakumar Thulasimani <sivakumar.thulasimani at 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 | 72 +++++++++++++++++++++++++++++++---------
3 files changed, 63 insertions(+), 17 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index f3c77ca..cea54ee 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -309,7 +309,7 @@ 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 36805b6..86fdc3e 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 (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 455d44b..3014c37 100644
--- a/drivers/gpu/drm/i915/intel_ddi.c
+++ b/drivers/gpu/drm/i915/intel_ddi.c
@@ -1319,18 +1319,20 @@ struct bxt_clk_div {
uint32_t int_coef;
uint32_t gain_ctl;
uint32_t targ_cnt;
+ uint32_t dcoampovr_en;
+ 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, 0xd},
+ /* 432 */ {3, 1, 32, 1677722, 1, 1, 4, 9, 3, 8, 0, 15, 0x18}
};
static bool
@@ -1364,11 +1366,34 @@ 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;
+ clk_div.dco_amp = 15;
+ clk_div.dcoampovr_en = 0;
+ if (best_clock.vco >= 6200000 && best_clock.vco <= 6480000) {
+ clk_div.prop_coef = 4;
+ clk_div.int_coef = 9;
+ clk_div.gain_ctl = 3;
+ clk_div.targ_cnt = 8;
+ } else if ((best_clock.vco > 5400000 &&
+ best_clock.vco < 6200000) ||
+ (best_clock.vco >= 4800000 &&
+ best_clock.vco < 5400000)) {
+ clk_div.prop_coef = 5;
+ clk_div.int_coef = 11;
+ clk_div.gain_ctl = 3;
+ clk_div.targ_cnt = 9;
+ if (best_clock.vco >= 4800000 &&
+ best_clock.vco < 5400000)
+ clk_div.dcoampovr_en = 1;
+ } else if (best_clock.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;
+ }
+
if (clock > 270000)
clk_div.lanestagger = 0x18;
else if (clock > 135000)
@@ -1417,6 +1442,11 @@ bxt_ddi_pll_select(struct intel_crtc *intel_crtc,
crtc_state->dpll_hw_state.pll8 = clk_div.targ_cnt;
+ if (clk_div.dcoampovr_en)
+ crtc_state->dpll_hw_state.pll10 = PORT_PLL_DCO_AMP_OVR_EN;
+
+ 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;
@@ -2348,10 +2378,19 @@ 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.
- */
+ /* Spec update: Write 5 to lock threshold */
+ 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);
+
+ /* Spec update: Write DCO amplitude override value to i_dcoamp */
+ /* Spec update: Write DCO amplitude override enable to i_dcoampovrden_h */
+ temp = I915_READ(BXT_PORT_PLL(port, 10));
+ temp &= ~PORT_PLL_DCO_AMP_OVR_EN;
+ 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));
@@ -2415,6 +2454,7 @@ 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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