[Intel-gfx] [PATCH 2/2] drm/i915/hdmi: C20 computed PLL frequencies
Clint Taylor
clinton.a.taylor at intel.com
Fri May 5 18:46:40 UTC 2023
Use algorithm to generate HDMI C20 PLL clock frequencies.
BSPEC: 64568
Cc: Radhakrishna Sripada <radhakrishna.sripada at intel.com>
Cc: Mika Kahola <mika.kahola at intel.com>
Cc: Anusha Srivatsa <anusha.srivatsa at intel.com>
Cc: Gustavo Sousa <gustavo.sousa at intel.com>
Signed-off-by: Clint Taylor <clinton.a.taylor at intel.com>
---
drivers/gpu/drm/i915/display/intel_cx0_phy.c | 89 +++++++++++++++++--
.../gpu/drm/i915/display/intel_cx0_phy_regs.h | 53 +++++++++++
2 files changed, 136 insertions(+), 6 deletions(-)
diff --git a/drivers/gpu/drm/i915/display/intel_cx0_phy.c b/drivers/gpu/drm/i915/display/intel_cx0_phy.c
index d94127e7448b..fb5599ffca81 100644
--- a/drivers/gpu/drm/i915/display/intel_cx0_phy.c
+++ b/drivers/gpu/drm/i915/display/intel_cx0_phy.c
@@ -3,6 +3,8 @@
* Copyright © 2023 Intel Corporation
*/
+#include <linux/log2.h>
+#include <linux/math64.h>
#include "i915_reg.h"
#include "intel_cx0_phy.h"
#include "intel_cx0_phy_regs.h"
@@ -1901,6 +1903,74 @@ void intel_c10pll_dump_hw_state(struct drm_i915_private *i915,
i + 2, hw_state->pll[i + 2], i + 3, hw_state->pll[i + 3]);
}
+static int intel_c20_compute_hdmi_tmds_pll(u64 pixel_clock, struct intel_c20pll_state *pll_state)
+{
+ u64 datarate;
+ u64 mpll_tx_clk_div;
+ u64 vco_freq_shift;
+ u64 vco_freq;
+ u64 multiplier;
+ u64 mpll_multiplier;
+ u64 mpll_fracn_quot;
+ u64 mpll_fracn_rem;
+ u8 mpllb_ana_freq_vco;
+ u8 mpll_div_multiplier;
+
+ if (pixel_clock < 25175 || pixel_clock > 600000)
+ return -EINVAL;
+
+ datarate = ((u64)pixel_clock * 1000) * 10;
+ mpll_tx_clk_div = ilog2(div64_u64((u64)CLOCK_9999MHZ, (u64)datarate));
+ vco_freq_shift = ilog2(div64_u64((u64)CLOCK_4999MHZ * (u64)256, (u64)datarate));
+ vco_freq = (datarate << vco_freq_shift) >> 8;
+ multiplier = div64_u64((vco_freq << 28), (REFCLK_38_4_MHZ >> 4));
+ mpll_multiplier = 2 * (multiplier >> 32);
+
+ mpll_fracn_quot = (multiplier >> 16) & 0xFFFF;
+ mpll_fracn_rem = multiplier & 0xFFFF;
+
+ mpll_div_multiplier = min_t(u8, div64_u64((vco_freq * 16 + (datarate >> 1)), datarate), 255);
+
+ if (vco_freq <= DATARATE_3000000000)
+ mpllb_ana_freq_vco = MPLLB_ANA_FREQ_VCO_3;
+ else if (vco_freq <= DATARATE_3500000000)
+ mpllb_ana_freq_vco = MPLLB_ANA_FREQ_VCO_2;
+ else if (vco_freq <= DATARATE_4000000000)
+ mpllb_ana_freq_vco = MPLLB_ANA_FREQ_VCO_1;
+ else
+ mpllb_ana_freq_vco = MPLLB_ANA_FREQ_VCO_0;
+
+ pll_state->link_bit_rate = pixel_clock;
+ pll_state->clock = pixel_clock;
+ pll_state->tx[0] = 0xbe88;
+ pll_state->tx[1] = 0x9800;
+ pll_state->tx[2] = 0x0000;
+ pll_state->cmn[0] = 0x0500;
+ pll_state->cmn[1] = 0x0005;
+ pll_state->cmn[2] = 0x0000;
+ pll_state->cmn[3] = 0x0000;
+ pll_state->mpllb[0] = (MPLL_TX_CLK_DIV(mpll_tx_clk_div) |
+ MPLL_MULTIPLIER(mpll_multiplier));
+ pll_state->mpllb[1] = (CAL_DAC_CODE(CAL_DAC_CODE_31) |
+ WORD_CLK_DIV |
+ MPLL_DIV_MULTIPLIER(mpll_div_multiplier));
+ pll_state->mpllb[2] = (MPLLB_ANA_FREQ_VCO(mpllb_ana_freq_vco) |
+ CP_PROP(CP_PROP_20) |
+ CP_INT(CP_INT_6));
+ pll_state->mpllb[3] = (V2I(V2I_2) |
+ CP_PROP_GS(CP_PROP_GS_30) |
+ CP_INT_GS(CP_INT_GS_28));
+ pll_state->mpllb[4] = 0x0000;
+ pll_state->mpllb[5] = 0x0000;
+ pll_state->mpllb[6] = (C20_MPLLB_FRACEN | SSC_UP_SPREAD);
+ pll_state->mpllb[7] = MPLL_FRACN_DEN;
+ pll_state->mpllb[8] = mpll_fracn_quot;
+ pll_state->mpllb[9] = mpll_fracn_rem;
+ pll_state->mpllb[10] = HDMI_DIV(HDMI_DIV_1);
+
+ return 0;
+}
+
static int intel_c20_phy_check_hdmi_link_rate(int clock)
{
const struct intel_c20pll_state * const *tables = mtl_c20_hdmi_tables;
@@ -1911,6 +1981,9 @@ static int intel_c20_phy_check_hdmi_link_rate(int clock)
return MODE_OK;
}
+ if (clock >= 25175 && clock <= 594000)
+ return MODE_OK;
+
return MODE_CLOCK_RANGE;
}
@@ -1944,6 +2017,13 @@ static int intel_c20pll_calc_state(struct intel_crtc_state *crtc_state,
const struct intel_c20pll_state * const *tables;
int i;
+ /* try computed C20 HDMI tables before using consolidated tables */
+ if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_HDMI)) {
+ if (intel_c20_compute_hdmi_tmds_pll(crtc_state->port_clock,
+ &crtc_state->cx0pll_state.c20) == 0)
+ return 0;
+ }
+
tables = intel_c20_pll_tables_get(crtc_state, encoder);
if (!tables)
return -EINVAL;
@@ -2093,13 +2173,10 @@ static u8 intel_c20_get_dp_rate(u32 clock)
static u8 intel_c20_get_hdmi_rate(u32 clock)
{
- switch (clock) {
- case 25175:
- case 27000:
- case 74250:
- case 148500:
- case 594000:
+ if ((clock >= 25175) && (clock <= 600000))
return 0;
+
+ switch (clock) {
case 166670: /* 3 Gbps */
case 333330: /* 6 Gbps */
case 666670: /* 12 Gbps */
diff --git a/drivers/gpu/drm/i915/display/intel_cx0_phy_regs.h b/drivers/gpu/drm/i915/display/intel_cx0_phy_regs.h
index ab9d1d983b88..cb5d1be2ba19 100644
--- a/drivers/gpu/drm/i915/display/intel_cx0_phy_regs.h
+++ b/drivers/gpu/drm/i915/display/intel_cx0_phy_regs.h
@@ -218,4 +218,57 @@
#define RAWLANEAONX_DIG_TX_MPLLB_CAL_DONE_BANK(idx) (0x303D + (idx))
+/* C20 HDMI computed pll definitions */
+#define REFCLK_38_4_MHZ 38400000
+#define CLOCK_4999MHZ 4999999999
+#define CLOCK_9999MHZ 9999999999
+#define DATARATE_3000000000 3000000000
+#define DATARATE_3500000000 3500000000
+#define DATARATE_4000000000 4000000000
+#define MPLL_FRACN_DEN 0xFFFF
+
+#define SSC_UP_SPREAD REG_BIT16(9)
+#define WORD_CLK_DIV REG_BIT16(8)
+
+#define MPLL_TX_CLK_DIV(val) REG_FIELD_PREP16(C20_MPLLB_TX_CLK_DIV_MASK, val)
+#define MPLL_MULTIPLIER(val) REG_FIELD_PREP16(C20_MULTIPLIER_MASK, val)
+
+#define MPLLB_ANA_FREQ_VCO_0 0
+#define MPLLB_ANA_FREQ_VCO_1 1
+#define MPLLB_ANA_FREQ_VCO_2 2
+#define MPLLB_ANA_FREQ_VCO_3 3
+#define MPLLB_ANA_FREQ_VCO_MASK REG_GENMASK16(15, 14)
+#define MPLLB_ANA_FREQ_VCO(val) REG_FIELD_PREP16(MPLLB_ANA_FREQ_VCO_MASK, val)
+
+#define MPLL_DIV_MULTIPLIER_MASK REG_GENMASK16(7, 0)
+#define MPLL_DIV_MULTIPLIER(val) REG_FIELD_PREP16(MPLL_DIV_MULTIPLIER_MASK, val)
+
+#define CAL_DAC_CODE_31 31
+#define CAL_DAC_CODE_MASK REG_GENMASK16(14, 10)
+#define CAL_DAC_CODE(val) REG_FIELD_PREP16(CAL_DAC_CODE_MASK, val)
+
+#define CP_INT_GS_28 28
+#define CP_INT_GS_MASK REG_GENMASK16(6, 0)
+#define CP_INT_GS(val) REG_FIELD_PREP16(CP_INT_GS_MASK, val)
+
+#define CP_PROP_GS_30 30
+#define CP_PROP_GS_MASK REG_GENMASK16(13, 7)
+#define CP_PROP_GS(val) REG_FIELD_PREP16(CP_PROP_GS_MASK, val)
+
+#define CP_INT_6 6
+#define CP_INT_MASK REG_GENMASK16(6, 0)
+#define CP_INT(val) REG_FIELD_PREP16(CP_INT_MASK, val)
+
+#define CP_PROP_20 20
+#define CP_PROP_MASK REG_GENMASK16(13, 7)
+#define CP_PROP(val) REG_FIELD_PREP16(CP_PROP_MASK, val)
+
+#define V2I_2 2
+#define V2I_MASK REG_GENMASK16(15, 14)
+#define V2I(val) REG_FIELD_PREP16(V2I_MASK, val)
+
+#define HDMI_DIV_1 1
+#define HDMI_DIV_MASK REG_GENMASK16(2, 0)
+#define HDMI_DIV(val) REG_FIELD_PREP16(HDMI_DIV_MASK, val)
+
#endif /* __INTEL_CX0_REG_DEFS_H__ */
--
2.25.1
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