From: Suraj Kandpal Date: Sat, 1 Nov 2025 03:24:51 +0000 (+0530) Subject: drm/i915/ltphy: Phy lane reset for LT Phy X-Git-Tag: v6.19-rc1~157^2~17^2~29 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=154ebdb77a3890d2aac543539314485a0711d815;p=thirdparty%2Fkernel%2Flinux.git drm/i915/ltphy: Phy lane reset for LT Phy Define function to bring phy lane out of reset for LT Phy and the corresponding pre-requisite steps before we follow the steps for Phy lane reset. Also create a skeleton of LT PHY PLL enable sequence function in which we can place this function Bspec: 77449, 74749, 74499, 74495, 68960 Signed-off-by: Suraj Kandpal Reviewed-by: Arun R Murthy Link: https://patch.msgid.link/20251101032513.4171255-4-suraj.kandpal@intel.com --- diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile index 4d107d114690f..84ec79b649604 100644 --- a/drivers/gpu/drm/i915/Makefile +++ b/drivers/gpu/drm/i915/Makefile @@ -357,6 +357,7 @@ i915-y += \ display/intel_gmbus.o \ display/intel_hdmi.o \ display/intel_lspcon.o \ + display/intel_lt_phy.o \ display/intel_lvds.o \ display/intel_panel.o \ display/intel_pfit.o \ diff --git a/drivers/gpu/drm/i915/display/intel_cx0_phy.c b/drivers/gpu/drm/i915/display/intel_cx0_phy.c index 71c8b29cb7c06..38fcdb2e75f60 100644 --- a/drivers/gpu/drm/i915/display/intel_cx0_phy.c +++ b/drivers/gpu/drm/i915/display/intel_cx0_phy.c @@ -2854,7 +2854,7 @@ static void intel_cx0_powerdown_change_sequence(struct intel_encoder *encoder, phy_name(phy), XELPDP_PORT_RESET_START_TIMEOUT_US); } -static void intel_cx0_setup_powerdown(struct intel_encoder *encoder) +void intel_cx0_setup_powerdown(struct intel_encoder *encoder) { struct intel_display *display = to_intel_display(encoder); enum port port = encoder->port; diff --git a/drivers/gpu/drm/i915/display/intel_cx0_phy.h b/drivers/gpu/drm/i915/display/intel_cx0_phy.h index c5a7b529955b0..c92026fe7b8f1 100644 --- a/drivers/gpu/drm/i915/display/intel_cx0_phy.h +++ b/drivers/gpu/drm/i915/display/intel_cx0_phy.h @@ -41,6 +41,8 @@ bool intel_cx0pll_compare_hw_state(const struct intel_cx0pll_state *a, const struct intel_cx0pll_state *b); void intel_cx0_phy_set_signal_levels(struct intel_encoder *encoder, const struct intel_crtc_state *crtc_state); +int intel_cx0_phy_check_hdmi_link_rate(struct intel_hdmi *hdmi, int clock); +void intel_cx0_setup_powerdown(struct intel_encoder *encoder); int intel_mtl_tbt_calc_port_clock(struct intel_encoder *encoder); void intel_cx0_pll_power_save_wa(struct intel_display *display); void intel_lnl_mac_transmit_lfps(struct intel_encoder *encoder, 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 cd941f16529cd..93bed6b0bda1d 100644 --- a/drivers/gpu/drm/i915/display/intel_cx0_phy_regs.h +++ b/drivers/gpu/drm/i915/display/intel_cx0_phy_regs.h @@ -104,6 +104,8 @@ #define XELPDP_PORT_BUF_PORT_DATA_20BIT REG_FIELD_PREP(XELPDP_PORT_BUF_PORT_DATA_WIDTH_MASK, 1) #define XELPDP_PORT_BUF_PORT_DATA_40BIT REG_FIELD_PREP(XELPDP_PORT_BUF_PORT_DATA_WIDTH_MASK, 2) #define XELPDP_PORT_REVERSAL REG_BIT(16) +#define XE3PLPDP_PHY_MODE_MASK REG_GENMASK(15, 12) +#define XE3PLPDP_PHY_MODE_DP REG_FIELD_PREP(XE3PLPDP_PHY_MODE_MASK, 0x3) #define XELPDP_PORT_BUF_IO_SELECT_TBT REG_BIT(11) #define XELPDP_PORT_BUF_PHY_IDLE REG_BIT(7) #define XELPDP_TC_PHY_OWNERSHIP REG_BIT(6) @@ -124,6 +126,7 @@ _XELPDP_PORT_BUF_CTL2(port)) #define XELPDP_LANE_PIPE_RESET(lane) _PICK(lane, REG_BIT(31), REG_BIT(30)) #define XELPDP_LANE_PHY_CURRENT_STATUS(lane) _PICK(lane, REG_BIT(29), REG_BIT(28)) +#define XE3PLPDP_LANE_PHY_PULSE_STATUS(lane) _PICK(lane, REG_BIT(27), REG_BIT(26)) #define XELPDP_LANE_POWERDOWN_UPDATE(lane) _PICK(lane, REG_BIT(25), REG_BIT(24)) #define _XELPDP_LANE0_POWERDOWN_NEW_STATE_MASK REG_GENMASK(23, 20) #define _XELPDP_LANE0_POWERDOWN_NEW_STATE(val) REG_FIELD_PREP(_XELPDP_LANE0_POWERDOWN_NEW_STATE_MASK, val) @@ -151,6 +154,7 @@ #define XELPDP_POWER_STATE_ACTIVE(val) REG_FIELD_PREP(XELPDP_POWER_STATE_ACTIVE_MASK, val) #define XELPDP_P0_STATE_ACTIVE 0x0 #define XELPDP_P2_STATE_READY 0x2 +#define XE3PLPD_P4_STATE_DISABLE 0x4 #define XELPDP_P2PG_STATE_DISABLE 0x9 #define XELPDP_P4PG_STATE_DISABLE 0xC #define XELPDP_P2_STATE_RESET 0x2 diff --git a/drivers/gpu/drm/i915/display/intel_lt_phy.c b/drivers/gpu/drm/i915/display/intel_lt_phy.c new file mode 100644 index 0000000000000..c65333cc9494f --- /dev/null +++ b/drivers/gpu/drm/i915/display/intel_lt_phy.c @@ -0,0 +1,159 @@ +// SPDX-License-Identifier: MIT +/* + * Copyright © 2025 Intel Corporation + */ + +#include + +#include "i915_reg.h" +#include "intel_cx0_phy.h" +#include "intel_cx0_phy_regs.h" +#include "intel_de.h" +#include "intel_display.h" +#include "intel_display_types.h" +#include "intel_lt_phy.h" +#include "intel_lt_phy_regs.h" +#include "intel_tc.h" + +#define INTEL_LT_PHY_LANE0 BIT(0) +#define INTEL_LT_PHY_LANE1 BIT(1) +#define INTEL_LT_PHY_BOTH_LANES (INTEL_LT_PHY_LANE1 |\ + INTEL_LT_PHY_LANE0) + +static u8 intel_lt_phy_get_owned_lane_mask(struct intel_encoder *encoder) +{ + struct intel_digital_port *dig_port = enc_to_dig_port(encoder); + + if (!intel_tc_port_in_dp_alt_mode(dig_port)) + return INTEL_LT_PHY_BOTH_LANES; + + return intel_tc_port_max_lane_count(dig_port) > 2 + ? INTEL_LT_PHY_BOTH_LANES : INTEL_LT_PHY_LANE0; +} + +static void +intel_lt_phy_setup_powerdown(struct intel_encoder *encoder, u8 lane_count) +{ + /* + * The new PORT_BUF_CTL6 stuff for dc5 entry and exit needs to be handled + * by dmc firmware not explicitly mentioned in Bspec. This leaves this + * function as a wrapper only but keeping it expecting future changes. + */ + intel_cx0_setup_powerdown(encoder); +} + +static void +intel_lt_phy_lane_reset(struct intel_encoder *encoder, + u8 lane_count) +{ + struct intel_display *display = to_intel_display(encoder); + enum port port = encoder->port; + enum phy phy = intel_encoder_to_phy(encoder); + u8 owned_lane_mask = intel_lt_phy_get_owned_lane_mask(encoder); + u32 lane_pipe_reset = owned_lane_mask == INTEL_LT_PHY_BOTH_LANES + ? XELPDP_LANE_PIPE_RESET(0) | XELPDP_LANE_PIPE_RESET(1) + : XELPDP_LANE_PIPE_RESET(0); + u32 lane_phy_current_status = owned_lane_mask == INTEL_LT_PHY_BOTH_LANES + ? (XELPDP_LANE_PHY_CURRENT_STATUS(0) | + XELPDP_LANE_PHY_CURRENT_STATUS(1)) + : XELPDP_LANE_PHY_CURRENT_STATUS(0); + u32 lane_phy_pulse_status = owned_lane_mask == INTEL_LT_PHY_BOTH_LANES + ? (XE3PLPDP_LANE_PHY_PULSE_STATUS(0) | + XE3PLPDP_LANE_PHY_PULSE_STATUS(1)) + : XE3PLPDP_LANE_PHY_PULSE_STATUS(0); + + intel_de_rmw(display, XE3PLPD_PORT_BUF_CTL5(port), + XE3PLPD_MACCLK_RATE_MASK, XE3PLPD_MACCLK_RATE_DEF); + + intel_de_rmw(display, XELPDP_PORT_BUF_CTL1(display, port), + XE3PLPDP_PHY_MODE_MASK, XE3PLPDP_PHY_MODE_DP); + + intel_lt_phy_setup_powerdown(encoder, lane_count); + + intel_de_rmw(display, XE3PLPD_PORT_BUF_CTL5(port), + XE3PLPD_MACCLK_RESET_0, 0); + + intel_de_rmw(display, XELPDP_PORT_CLOCK_CTL(display, port), + XELPDP_LANE_PCLK_PLL_REQUEST(0), + XELPDP_LANE_PCLK_PLL_REQUEST(0)); + + if (intel_de_wait_custom(display, XELPDP_PORT_CLOCK_CTL(display, port), + XELPDP_LANE_PCLK_PLL_ACK(0), + XELPDP_LANE_PCLK_PLL_ACK(0), + XE3PLPD_MACCLK_TURNON_LATENCY_US, + XE3PLPD_MACCLK_TURNON_LATENCY_MS, NULL)) + drm_warn(display->drm, "PHY %c PLL MacCLK assertion Ack not done after %dus.\n", + phy_name(phy), XE3PLPD_MACCLK_TURNON_LATENCY_MS * 1000); + + intel_de_rmw(display, XELPDP_PORT_CLOCK_CTL(display, port), + XELPDP_FORWARD_CLOCK_UNGATE, + XELPDP_FORWARD_CLOCK_UNGATE); + + intel_de_rmw(display, XELPDP_PORT_BUF_CTL2(display, port), + lane_pipe_reset | lane_phy_pulse_status, 0); + + if (intel_de_wait_custom(display, XELPDP_PORT_BUF_CTL2(display, port), + lane_phy_current_status, 0, + XE3PLPD_RESET_END_LATENCY_US, 2, NULL)) + drm_warn(display->drm, + "PHY %c failed to bring out of Lane reset after %dus.\n", + phy_name(phy), XE3PLPD_RESET_END_LATENCY_US); + + if (intel_de_wait_custom(display, XELPDP_PORT_BUF_CTL2(display, port), + lane_phy_pulse_status, lane_phy_pulse_status, + XE3PLPD_RATE_CALIB_DONE_LATENCY_US, 0, NULL)) + drm_warn(display->drm, "PHY %c PLL rate not changed after %dus.\n", + phy_name(phy), XE3PLPD_RATE_CALIB_DONE_LATENCY_US); + + intel_de_rmw(display, XELPDP_PORT_BUF_CTL2(display, port), lane_phy_pulse_status, 0); +} + +void intel_lt_phy_pll_enable(struct intel_encoder *encoder, + const struct intel_crtc_state *crtc_state) +{ + /* 1. Enable MacCLK at default 162 MHz frequency. */ + intel_lt_phy_lane_reset(encoder, crtc_state->lane_count); + + /* 2. Program PORT_CLOCK_CTL register to configure clock muxes, gating, and SSC. */ + /* 3. Change owned PHY lanes power to Ready state. */ + /* + * 4. Read the PHY message bus VDR register PHY_VDR_0_Config check enabled PLL type, + * encoded rate and encoded mode. + */ + /* + * 5. Program the PHY internal PLL registers over PHY message bus for the desired + * frequency and protocol type + */ + /* 6. Use the P2P transaction flow */ + /* + * 6.1. Set the PHY VDR register 0xCC4[Rate Control VDR Update] = 1 over PHY message + * bus for Owned PHY Lanes. + */ + /* + * 6.2. Poll for P2P Transaction Ready = "1" and read the MAC message bus VDR register + * at offset 0xC00 for Owned PHY Lanes. + */ + /* 6.3. Clear P2P transaction Ready bit. */ + /* 7. Program PORT_CLOCK_CTL[PCLK PLL Request LN0] = 0. */ + /* 8. Poll for PORT_CLOCK_CTL[PCLK PLL Ack LN0]= 0. */ + /* + * 9. Follow the Display Voltage Frequency Switching - Sequence Before Frequency Change. + * We handle this step in bxt_set_cdclk() + */ + /* 10. Program DDI_CLK_VALFREQ to match intended DDI clock frequency. */ + /* 11. Program PORT_CLOCK_CTL[PCLK PLL Request LN0] = 1. */ + /* 12. Poll for PORT_CLOCK_CTL[PCLK PLL Ack LN0]= 1. */ + /* 13. Ungate the forward clock by setting PORT_CLOCK_CTL[Forward Clock Ungate] = 1. */ + /* 14. SW clears PORT_BUF_CTL2 [PHY Pulse Status]. */ + /* + * 15. Clear the PHY VDR register 0xCC4[Rate Control VDR Update] over PHY message bus for + * Owned PHY Lanes. + */ + /* 16. Poll for PORT_BUF_CTL2 register PHY Pulse Status = 1 for Owned PHY Lanes. */ + /* 17. SW clears PORT_BUF_CTL2 [PHY Pulse Status]. */ + /* + * 18. Follow the Display Voltage Frequency Switching - Sequence After Frequency Change. + * We handle this step in bxt_set_cdclk() + */ + /* 19. Move the PHY powerdown state to Active and program to enable/disable transmitters */ +} diff --git a/drivers/gpu/drm/i915/display/intel_lt_phy.h b/drivers/gpu/drm/i915/display/intel_lt_phy.h new file mode 100644 index 0000000000000..bd3ff3007e1d5 --- /dev/null +++ b/drivers/gpu/drm/i915/display/intel_lt_phy.h @@ -0,0 +1,17 @@ +/* SPDX-License-Identifier: MIT + * + * Copyright © 2025 Intel Corporation + */ + +#ifndef __INTEL_LT_PHY_H__ +#define __INTEL_LT_PHY_H__ + +#include + +struct intel_encoder; +struct intel_crtc_state; + +void intel_lt_phy_pll_enable(struct intel_encoder *encoder, + const struct intel_crtc_state *crtc_state); + +#endif /* __INTEL_LT_PHY_H__ */ diff --git a/drivers/gpu/drm/i915/display/intel_lt_phy_regs.h b/drivers/gpu/drm/i915/display/intel_lt_phy_regs.h index 6eaa038bf6849..8bc25a5643003 100644 --- a/drivers/gpu/drm/i915/display/intel_lt_phy_regs.h +++ b/drivers/gpu/drm/i915/display/intel_lt_phy_regs.h @@ -6,6 +6,12 @@ #ifndef __INTEL_LT_PHY_REGS_H__ #define __INTEL_LT_PHY_REGS_H__ +#define XE3PLPD_MACCLK_TURNON_LATENCY_MS 1 +#define XE3PLPD_MACCLK_TURNON_LATENCY_US 21 +#define XE3PLPD_RATE_CALIB_DONE_LATENCY_US 50 +#define XE3PLPD_RESET_START_LATENCY_US 10 +#define XE3PLPD_RESET_END_LATENCY_US 200 + /* LT Phy Vendor Register */ #define LT_PHY_VDR_0_CONFIG 0xC02 #define LT_PHY_VDR_DP_PLL_ENABLE REG_BIT(7) @@ -21,4 +27,15 @@ #define LT_PHY_RATE_UPDATE 0xCC4 +#define _XE3PLPD_PORT_BUF_CTL5(idx) _MMIO(_PICK_EVEN_2RANGES(idx, PORT_TC1, \ + _XELPDP_PORT_BUF_CTL1_LN0_A, \ + _XELPDP_PORT_BUF_CTL1_LN0_B, \ + _XELPDP_PORT_BUF_CTL1_LN0_USBC1, \ + _XELPDP_PORT_BUF_CTL1_LN0_USBC2) \ + + 0x34) +#define XE3PLPD_PORT_BUF_CTL5(port) _XE3PLPD_PORT_BUF_CTL5(__xe2lpd_port_idx(port)) +#define XE3PLPD_MACCLK_RESET_0 REG_BIT(11) +#define XE3PLPD_MACCLK_RATE_MASK REG_GENMASK(4, 0) +#define XE3PLPD_MACCLK_RATE_DEF REG_FIELD_PREP(XE3PLPD_MACCLK_RATE_MASK, 0x1F) + #endif /* __INTEL_LT_PHY_REGS_H__ */ diff --git a/drivers/gpu/drm/xe/Makefile b/drivers/gpu/drm/xe/Makefile index 25a2f7b578029..b99e293161a1e 100644 --- a/drivers/gpu/drm/xe/Makefile +++ b/drivers/gpu/drm/xe/Makefile @@ -290,6 +290,7 @@ xe-$(CONFIG_DRM_XE_DISPLAY) += \ i915-display/intel_hti.o \ i915-display/intel_link_bw.o \ i915-display/intel_lspcon.o \ + i915-display/intel_lt_phy.o \ i915-display/intel_modeset_lock.o \ i915-display/intel_modeset_setup.o \ i915-display/intel_modeset_verify.o \