From: Radhakrishna Sripada <radhakrishna.sripada@xxxxxxxxx>
C10 phys uses direct mapping internally for voltage and pre-emphasis levels.
Program the levels directly to the fields in the VDR Registers.
Bspec: 65449
v2: From table "C10: Tx EQ settings for DP 1.4x" it shows level 1
and preemphasis 1 instead of two times of level 1 preemphasis 0.
Fix this in the driver code as well.
v3: VSwing update (Clint)
Cc: Imre Deak <imre.deak@xxxxxxxxx>
Cc: Uma Shankar <uma.shankar@xxxxxxxxx>
Signed-off-by: Clint Taylor <Clinton.A.Taylor@xxxxxxxxx>
Signed-off-by: Radhakrishna Sripada <radhakrishna.sripada@xxxxxxxxx>
Signed-off-by: Mika Kahola <mika.kahola@xxxxxxxxx>
---
drivers/gpu/drm/i915/display/intel_cx0_phy.c | 140 ++++++++++++++++--
drivers/gpu/drm/i915/display/intel_cx0_phy.h | 2 +
.../gpu/drm/i915/display/intel_cx0_phy_regs.h | 14 ++
drivers/gpu/drm/i915/display/intel_ddi.c | 4 +-
.../drm/i915/display/intel_ddi_buf_trans.c | 36 ++++-
.../drm/i915/display/intel_ddi_buf_trans.h | 6 +
.../i915/display/intel_display_power_map.c | 1 +
7 files changed, 192 insertions(+), 11 deletions(-)
diff --git a/drivers/gpu/drm/i915/display/intel_cx0_phy.c b/drivers/gpu/drm/i915/display/intel_cx0_phy.c
index c73d2bc3e1a8..3d61afbe7bdb 100644
--- a/drivers/gpu/drm/i915/display/intel_cx0_phy.c
+++ b/drivers/gpu/drm/i915/display/intel_cx0_phy.c
@@ -6,11 +6,15 @@
#include "i915_reg.h"
#include "intel_cx0_phy.h"
#include "intel_cx0_phy_regs.h"
+#include "intel_ddi.h"
+#include "intel_ddi_buf_trans.h"
#include "intel_de.h"
#include "intel_display_types.h"
#include "intel_dp.h"
#include "intel_panel.h"
#include "intel_tc.h"
+#include "intel_psr.h"
+#include "intel_uncore.h"
bool intel_is_c10phy(struct drm_i915_private *dev_priv, enum phy phy)
{
@@ -20,6 +24,15 @@ bool intel_is_c10phy(struct drm_i915_private *dev_priv, enum phy phy)
return false;
}
+static void
+assert_dc_off(struct drm_i915_private *i915)
+{
+ bool enabled;
+
+ enabled = intel_display_power_is_enabled(i915, POWER_DOMAIN_DC_OFF);
+ drm_WARN_ON(&i915->drm, !enabled);
+}
+
static void intel_cx0_bus_reset(struct drm_i915_private *i915, enum port port, int lane)
{
enum phy phy = intel_port_to_phy(i915, port);
@@ -112,6 +125,8 @@ static u8 intel_cx0_read(struct drm_i915_private *i915, enum port port,
int i, status = 0;
u32 val;
+ assert_dc_off(i915);
+
for (i = 0; i < 3; i++) {
status = __intel_cx0_read(i915, port, lane, addr, &val);
@@ -194,6 +209,8 @@ static void __intel_cx0_write(struct drm_i915_private *i915, enum port port,
enum phy phy = intel_port_to_phy(i915, port);
int i, status;
+ assert_dc_off(i915);
+
for (i = 0; i < 3; i++) {
status = __intel_cx0_write_once(i915, port, lane, addr, data, committed);
@@ -241,6 +258,89 @@ static void intel_cx0_rmw(struct drm_i915_private *i915, enum port port,
}
}
+/*
+ * Prepare HW for CX0 phy transactions.
+ *
+ * It is required that PSR and DC5/6 are disabled before any CX0 message
+ * bus transaction is executed.
+ */
+static intel_wakeref_t intel_cx0_phy_transaction_begin(struct intel_encoder *encoder)
+{
+ struct drm_i915_private *i915 = to_i915(encoder->base.dev);
+ struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
+
+ intel_psr_pause(intel_dp);
+ return intel_display_power_get(i915, POWER_DOMAIN_DC_OFF);
+}
+
+static void intel_cx0_phy_transaction_end(struct intel_encoder *encoder, intel_wakeref_t wakeref)
+{
+ struct drm_i915_private *i915 = to_i915(encoder->base.dev);
+ struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
+
+ intel_psr_resume(intel_dp);
+ intel_display_power_put(i915, POWER_DOMAIN_DC_OFF, wakeref);
+}
+
+void intel_cx0_phy_set_signal_levels(struct intel_encoder *encoder,
+ const struct intel_crtc_state *crtc_state)
+{
+ struct drm_i915_private *i915 = to_i915(encoder->base.dev);
+ struct intel_digital_port *dig_port = enc_to_dig_port(encoder);
+ bool lane_reversal = dig_port->saved_port_bits & DDI_BUF_PORT_REVERSAL;
+ u8 master_lane = lane_reversal ? INTEL_CX0_LANE1 :
+ INTEL_CX0_LANE0;
+ u8 follower_lane = lane_reversal ? INTEL_CX0_LANE0 :
+ INTEL_CX0_LANE1;
+ const struct intel_ddi_buf_trans *trans;
+ intel_wakeref_t wakeref;
+ int n_entries, ln;
+
+ wakeref = intel_cx0_phy_transaction_begin(encoder);
+
+ trans = encoder->get_buf_trans(encoder, crtc_state, &n_entries);
+ if (drm_WARN_ON_ONCE(&i915->drm, !trans))
+ return;
+
+ intel_cx0_rmw(i915, encoder->port, INTEL_CX0_BOTH_LANES, PHY_C10_VDR_CONTROL(1),
+ 0, C10_VDR_CTRL_MSGBUS_ACCESS, MB_WRITE_COMMITTED);
+
+ for (ln = 0; ln < 4; ln++) {
+ int level = intel_ddi_level(encoder, crtc_state, ln);
+ int lane, tx;
+
+ lane = ln / 2 + 1;
+ tx = ln % 2 + 1;
+
+ intel_cx0_rmw(i915, encoder->port, lane, PHY_CX0_VDR_OVRD_CONTROL(lane, tx, 0),
+ C10_PHY_OVRD_LEVEL_MASK,
+ C10_PHY_OVRD_LEVEL(trans->entries[level].snps.pre_cursor),
+ MB_WRITE_COMMITTED);
+ intel_cx0_rmw(i915, encoder->port, lane, PHY_CX0_VDR_OVRD_CONTROL(lane, tx, 1),
+ C10_PHY_OVRD_LEVEL_MASK,
+ C10_PHY_OVRD_LEVEL(trans->entries[level].snps.vswing),
+ MB_WRITE_COMMITTED);
+ intel_cx0_rmw(i915, encoder->port, lane, PHY_CX0_VDR_OVRD_CONTROL(lane, tx, 2),
+ C10_PHY_OVRD_LEVEL_MASK,
+ C10_PHY_OVRD_LEVEL(trans->entries[level].snps.post_cursor),
+ MB_WRITE_COMMITTED);
+ }
+
+ /* Write Override enables in 0xD71 */
+ intel_cx0_rmw(i915, encoder->port, INTEL_CX0_BOTH_LANES, PHY_C10_VDR_OVRD,
+ PHY_C10_VDR_OVRD_TX1 | PHY_C10_VDR_OVRD_TX2,
+ PHY_C10_VDR_OVRD_TX1 | PHY_C10_VDR_OVRD_TX2,
+ MB_WRITE_COMMITTED);
+ intel_cx0_write(i915, encoder->port, follower_lane, PHY_C10_VDR_CONTROL(1),
+ C10_VDR_CTRL_MSGBUS_ACCESS | C10_VDR_CTRL_UPDATE_CFG,
+ MB_WRITE_COMMITTED);
+ intel_cx0_write(i915, encoder->port, master_lane, PHY_C10_VDR_CONTROL(1),
+ C10_VDR_CTRL_MASTER_LANE | C10_VDR_CTRL_MSGBUS_ACCESS |
+ C10_VDR_CTRL_UPDATE_CFG, MB_WRITE_COMMITTED);
+
+ intel_cx0_phy_transaction_end(encoder, wakeref);
+}
+
/*
* Basic DP link rates with 38.4 MHz reference clock.
* Note: The tables below are with SSC. In non-ssc
@@ -1085,9 +1185,12 @@ void intel_c10mpllb_readout_hw_state(struct intel_encoder *encoder,
u8 lane = lane_reversal ? INTEL_CX0_LANE1 :
INTEL_CX0_LANE0;
enum phy phy = intel_port_to_phy(i915, encoder->port);
+ intel_wakeref_t wakeref;
int i;
u8 cmn, tx0;
+ wakeref = intel_cx0_phy_transaction_begin(encoder);
+
/*
* According to C10 VDR Register programming Sequence we need
* to do this to read PHY internal registers from MsgBus.
@@ -1106,6 +1209,8 @@ void intel_c10mpllb_readout_hw_state(struct intel_encoder *encoder,
cmn != C10_CMN0_HDMI_VAL))
drm_dbg_kms(&i915->drm, "Unexpected tx: %x or cmn: %x for phy: %c.\n",
tx0, cmn, phy_name(phy));
+
+ intel_cx0_phy_transaction_end(encoder, wakeref);
}
static void intel_c10_pll_program(struct drm_i915_private *i915,
@@ -1243,8 +1348,11 @@ static void intel_program_port_clock_ctl(struct intel_encoder *encoder,
if (intel_crtc_has_dp_encoder(crtc_state)) {
intel_dp = enc_to_intel_dp(encoder);
- ssc_enabled = intel_dp->dpcd[DP_MAX_DOWNSPREAD] &
- DP_MAX_DOWNSPREAD_0_5;
+ ssc_enabled = (intel_dp->dpcd[DP_MAX_DOWNSPREAD] &
+ DP_MAX_DOWNSPREAD_0_5);
+
+ if (intel_dp_is_edp(intel_dp) && !intel_panel_use_ssc(i915))
+ ssc_enabled = false;
if (!intel_panel_use_ssc(i915))
ssc_enabled = false;
@@ -1252,11 +1360,11 @@ static void intel_program_port_clock_ctl(struct intel_encoder *encoder,
/* TODO: DP2.0 10G and 20G rates enable MPLLA*/
val |= ssc_enabled ? XELPDP_SSC_ENABLE_PLLB : 0;
}
+
intel_de_rmw(i915, XELPDP_PORT_CLOCK_CTL(encoder->port),
- XELPDP_LANE1_PHY_CLOCK_SELECT |
- XELPDP_FORWARD_CLOCK_UNGATE |
+ XELPDP_LANE1_PHY_CLOCK_SELECT | XELPDP_FORWARD_CLOCK_UNGATE |
XELPDP_DDI_CLOCK_SELECT_MASK |
- XELPDP_SSC_ENABLE_PLLB, val);
+ XELPDP_SSC_ENABLE_PLLA | XELPDP_SSC_ENABLE_PLLB, val);
}
static u32 intel_cx0_get_powerdown_update(u8 lane)
@@ -1396,9 +1504,12 @@ static void intel_cx0_program_phy_lane(struct drm_i915_private *i915,
bool dp_alt_mode = intel_tc_port_in_dp_alt_mode(enc_to_dig_port(encoder));
enum port port = encoder->port;
- intel_cx0_rmw(i915, port, INTEL_CX0_BOTH_LANES, PHY_C10_VDR_CONTROL(1),
- C10_VDR_CTRL_MSGBUS_ACCESS, C10_VDR_CTRL_MSGBUS_ACCESS,
- MB_WRITE_COMMITTED);
+ intel_cx0_rmw(i915, port, INTEL_CX0_LANE1, PHY_C10_VDR_CONTROL(1),
+ C10_VDR_CTRL_MSGBUS_ACCESS | C10_VDR_CTRL_UPDATE_CFG,
+ C10_VDR_CTRL_MSGBUS_ACCESS, MB_WRITE_COMMITTED);
+ intel_cx0_rmw(i915, port, INTEL_CX0_LANE0, PHY_C10_VDR_CONTROL(1),
+ C10_VDR_CTRL_MSGBUS_ACCESS | C10_VDR_CTRL_UPDATE_CFG,
+ C10_VDR_CTRL_MASTER_LANE | C10_VDR_CTRL_MSGBUS_ACCESS, MB_WRITE_COMMITTED);
l0t1 = intel_cx0_read(i915, port, INTEL_CX0_LANE0, PHY_CX0_TX_CONTROL(1, 2));
l0t2 = intel_cx0_read(i915, port, INTEL_CX0_LANE0, PHY_CX0_TX_CONTROL(2, 2));
@@ -1561,9 +1672,14 @@ void intel_cx0pll_enable(struct intel_encoder *encoder,
{
struct drm_i915_private *i915 = to_i915(encoder->base.dev);
enum phy phy = intel_port_to_phy(i915, encoder->port);
+ intel_wakeref_t wakeref;
+
+ wakeref = intel_cx0_phy_transaction_begin(encoder);
drm_WARN_ON(&i915->drm, !intel_is_c10phy(i915, phy));
intel_c10pll_enable(encoder, crtc_state);
+
+ intel_cx0_phy_transaction_end(encoder, wakeref);
}
static void intel_c10pll_disable(struct intel_encoder *encoder)
@@ -1608,7 +1724,8 @@ static void intel_c10pll_disable(struct intel_encoder *encoder)
/* 7. Program PORT_CLOCK_CTL register to disable and gate clocks. */
intel_de_rmw(i915, XELPDP_PORT_CLOCK_CTL(encoder->port),
- XELPDP_DDI_CLOCK_SELECT_MASK |
+ XELPDP_DDI_CLOCK_SELECT_MASK, 0);
+ intel_de_rmw(i915, XELPDP_PORT_CLOCK_CTL(encoder->port),
XELPDP_FORWARD_CLOCK_UNGATE, 0);
}
@@ -1616,9 +1733,14 @@ void intel_cx0pll_disable(struct intel_encoder *encoder)
{
struct drm_i915_private *i915 = to_i915(encoder->base.dev);
enum phy phy = intel_port_to_phy(i915, encoder->port);
+ intel_wakeref_t wakeref;
+
+ wakeref = intel_cx0_phy_transaction_begin(encoder);
drm_WARN_ON(&i915->drm, !intel_is_c10phy(i915, phy));
intel_c10pll_disable(encoder);
+
+ intel_cx0_phy_transaction_end(encoder, wakeref);
}
void intel_c10mpllb_state_verify(struct intel_atomic_state *state,
diff --git a/drivers/gpu/drm/i915/display/intel_cx0_phy.h b/drivers/gpu/drm/i915/display/intel_cx0_phy.h
index f8023f240727..952c7deeffaa 100644
--- a/drivers/gpu/drm/i915/display/intel_cx0_phy.h
+++ b/drivers/gpu/drm/i915/display/intel_cx0_phy.h
@@ -40,5 +40,7 @@ int intel_c10mpllb_calc_port_clock(struct intel_encoder *encoder,
void intel_c10mpllb_state_verify(struct intel_atomic_state *state,
struct intel_crtc_state *new_crtc_state);
int intel_c10_phy_check_hdmi_link_rate(int clock);
+void intel_cx0_phy_set_signal_levels(struct intel_encoder *encoder,
+ const struct intel_crtc_state *crtc_state);
#endif /* __INTEL_CX0_PHY_H__ */
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 de909e9d4607..db67debb22e9 100644
--- a/drivers/gpu/drm/i915/display/intel_cx0_phy_regs.h
+++ b/drivers/gpu/drm/i915/display/intel_cx0_phy_regs.h
@@ -165,6 +165,14 @@
#define CX0_P4PG_STATE_DISABLE 0xC
#define CX0_P2_STATE_RESET 0x2
+#define PHY_C10_VDR_OVRD 0xD71
+#define PHY_C10_VDR_OVRD_TX1 REG_BIT8(0)
+#define PHY_C10_VDR_OVRD_TX2 REG_BIT8(2)
+#define PHY_C10_VDR_PRE_OVRD_TX1 0xD80
+#define C10_PHY_OVRD_LEVEL_MASK REG_GENMASK8(5, 0)
+#define C10_PHY_OVRD_LEVEL(val) REG_FIELD_PREP8(C10_PHY_OVRD_LEVEL_MASK, val)
+#define PHY_CX0_VDR_OVRD_CONTROL(lane, tx, control) (PHY_C10_VDR_PRE_OVRD_TX1 + ((lane) ^ ((tx) - 1)) * 0x10 + (control))
+
/* PHY_C10_VDR_PLL0 */
#define PLL_C10_MPLL_SSC_EN REG_BIT8(0)
@@ -172,4 +180,10 @@
#define PHY_CX0_TX_CONTROL(tx, control) (0x400 + ((tx) - 1) * 0x200 + (control))
#define CONTROL2_DISABLE_SINGLE_TX REG_BIT(6)
+/* C10 Phy VSWING Masks */
+#define C10_PHY_VSWING_LEVEL_MASK REG_GENMASK8(2, 0)
+#define C10_PHY_VSWING_LEVEL(val) REG_FIELD_PREP8(C10_PHY_VSWING_LEVEL_MASK, val)
+#define C10_PHY_VSWING_PREEMPH_MASK REG_GENMASK8(1, 0)
+#define C10_PHY_VSWING_PREEMPH(val) REG_FIELD_PREP8(C10_PHY_VSWING_PREEMPH_MASK, val)
+
#endif /* __INTEL_CX0_PHY_REGS_H__ */
diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c
index c3aecc18442e..8e2a2bad9d31 100644
--- a/drivers/gpu/drm/i915/display/intel_ddi.c
+++ b/drivers/gpu/drm/i915/display/intel_ddi.c
@@ -4456,7 +4456,9 @@ void intel_ddi_init(struct drm_i915_private *dev_priv, enum port port)
encoder->get_config = hsw_ddi_get_config;
}
- if (IS_DG2(dev_priv)) {
+ if (DISPLAY_VER(dev_priv) >= 14) {
+ encoder->set_signal_levels = intel_cx0_phy_set_signal_levels;
+ } else if (IS_DG2(dev_priv)) {
encoder->set_signal_levels = intel_snps_phy_set_signal_levels;
} else if (DISPLAY_VER(dev_priv) >= 12) {
if (intel_phy_is_combo(dev_priv, phy))
diff --git a/drivers/gpu/drm/i915/display/intel_ddi_buf_trans.c b/drivers/gpu/drm/i915/display/intel_ddi_buf_trans.c
index 006a2e979000..d5a9aa2de2fa 100644
--- a/drivers/gpu/drm/i915/display/intel_ddi_buf_trans.c
+++ b/drivers/gpu/drm/i915/display/intel_ddi_buf_trans.c
@@ -1035,6 +1035,30 @@ static const struct intel_ddi_buf_trans dg2_snps_trans_uhbr = {
.num_entries = ARRAY_SIZE(_dg2_snps_trans_uhbr),
};
+/*
+ * Some platforms don't need a mapping table and only expect us to
+ * to program the vswing + preemphasis levels directly since the
+ * hardware will do its own mapping to tuning values internally.
+ */
+static const union intel_ddi_buf_trans_entry _mtl_c10_trans_dp14[] = {
+ { .snps = { 26, 0, 0 } }, /* preset 0 */
+ { .snps = { 33, 0, 6 } }, /* preset 1 */
+ { .snps = { 38, 0, 11 } }, /* preset 2 */
+ { .snps = { 43, 0, 19 } }, /* preset 3 */
+ { .snps = { 39, 0, 0 } }, /* preset 4 */
+ { .snps = { 45, 0, 7 } }, /* preset 5 */
+ { .snps = { 46, 0, 13 } }, /* preset 6 */
+ { .snps = { 46, 0, 0 } }, /* preset 7 */
+ { .snps = { 55, 0, 7 } }, /* preset 8 */
+ { .snps = { 62, 0, 0 } }, /* preset 9 */
+};
+
+static const struct intel_ddi_buf_trans mtl_cx0_trans = {
+ .entries = _mtl_c10_trans_dp14,
+ .num_entries = ARRAY_SIZE(_mtl_c10_trans_dp14),
+ .hdmi_default_entry = ARRAY_SIZE(_mtl_c10_trans_dp14) - 1,
+};
+
bool is_hobl_buf_trans(const struct intel_ddi_buf_trans *table)
{
return table == &tgl_combo_phy_trans_edp_hbr2_hobl;
@@ -1606,12 +1630,22 @@ dg2_get_snps_buf_trans(struct intel_encoder *encoder,
return intel_get_buf_trans(&dg2_snps_trans, n_entries);
}
+static const struct intel_ddi_buf_trans *
+mtl_get_cx0_buf_trans(struct intel_encoder *encoder,
+ const struct intel_crtc_state *crtc_state,
+ int *n_entries)
+{
+ return intel_get_buf_trans(&mtl_cx0_trans, n_entries);
+}
+
void intel_ddi_buf_trans_init(struct intel_encoder *encoder)
{
struct drm_i915_private *i915 = to_i915(encoder->base.dev);
enum phy phy = intel_port_to_phy(i915, encoder->port);
- if (IS_DG2(i915)) {
+ if (DISPLAY_VER(i915) >= 14) {
+ encoder->get_buf_trans = mtl_get_cx0_buf_trans;
+ } else if (IS_DG2(i915)) {
encoder->get_buf_trans = dg2_get_snps_buf_trans;
} else if (IS_ALDERLAKE_P(i915)) {
if (intel_phy_is_combo(i915, phy))
diff --git a/drivers/gpu/drm/i915/display/intel_ddi_buf_trans.h b/drivers/gpu/drm/i915/display/intel_ddi_buf_trans.h
index 2133984a572b..e4a857b9829d 100644
--- a/drivers/gpu/drm/i915/display/intel_ddi_buf_trans.h
+++ b/drivers/gpu/drm/i915/display/intel_ddi_buf_trans.h
@@ -51,6 +51,11 @@ struct dg2_snps_phy_buf_trans {
u8 post_cursor;
};
+struct direct_phy_buf_trans {
+ u8 level;
+ u8 preemph;
+};
+
union intel_ddi_buf_trans_entry {
struct hsw_ddi_buf_trans hsw;
struct bxt_ddi_buf_trans bxt;
@@ -58,6 +63,7 @@ union intel_ddi_buf_trans_entry {
struct icl_mg_phy_ddi_buf_trans mg;
struct tgl_dkl_phy_ddi_buf_trans dkl;
struct dg2_snps_phy_buf_trans snps;
+ struct direct_phy_buf_trans direct;
};
struct intel_ddi_buf_trans {
diff --git a/drivers/gpu/drm/i915/display/intel_display_power_map.c b/drivers/gpu/drm/i915/display/intel_display_power_map.c
index 6645eb1911d8..5ec2b9a109ae 100644
--- a/drivers/gpu/drm/i915/display/intel_display_power_map.c
+++ b/drivers/gpu/drm/i915/display/intel_display_power_map.c
@@ -1427,6 +1427,7 @@ I915_DECL_PW_DOMAINS(xelpdp_pwdoms_dc_off,
XELPDP_PW_2_POWER_DOMAINS,
POWER_DOMAIN_AUDIO_MMIO,
POWER_DOMAIN_MODESET,
+ POWER_DOMAIN_DC_OFF,
POWER_DOMAIN_AUX_A,
POWER_DOMAIN_AUX_B,
POWER_DOMAIN_DC_OFF,
--
2.34.1
