[Intel-gfx] [PATCH v3 1/2] drm/i915/bxt: Port PLL programming BUN
Vandana Kannan
vandana.kannan at intel.com
Tue May 12 23:48:52 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
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 at intel.com>
Reviewed-by: Sivakumar Thulasimani <sivakumar.thulasimani at intel.com> [v1]
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 | 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
More information about the Intel-gfx
mailing list