diff options
Diffstat (limited to 'drivers/gpu/drm/i915/display/intel_tc.c')
| -rw-r--r-- | drivers/gpu/drm/i915/display/intel_tc.c | 544 |
1 files changed, 544 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/display/intel_tc.c b/drivers/gpu/drm/i915/display/intel_tc.c new file mode 100644 index 000000000000..85743a43bee2 --- /dev/null +++ b/drivers/gpu/drm/i915/display/intel_tc.c @@ -0,0 +1,544 @@ +// SPDX-License-Identifier: MIT +/* + * Copyright © 2019 Intel Corporation + */ + +#include "i915_drv.h" +#include "intel_display.h" +#include "intel_display_types.h" +#include "intel_dp_mst.h" +#include "intel_tc.h" + +static const char *tc_port_mode_name(enum tc_port_mode mode) +{ + static const char * const names[] = { + [TC_PORT_TBT_ALT] = "tbt-alt", + [TC_PORT_DP_ALT] = "dp-alt", + [TC_PORT_LEGACY] = "legacy", + }; + + if (WARN_ON(mode >= ARRAY_SIZE(names))) + mode = TC_PORT_TBT_ALT; + + return names[mode]; +} + +static bool has_modular_fia(struct drm_i915_private *i915) +{ + if (!INTEL_INFO(i915)->display.has_modular_fia) + return false; + + return intel_uncore_read(&i915->uncore, + PORT_TX_DFLEXDPSP(FIA1)) & MODULAR_FIA_MASK; +} + +static enum phy_fia tc_port_to_fia(struct drm_i915_private *i915, + enum tc_port tc_port) +{ + if (!has_modular_fia(i915)) + return FIA1; + + /* + * Each Modular FIA instance houses 2 TC ports. In SOC that has more + * than two TC ports, there are multiple instances of Modular FIA. + */ + return tc_port / 2; +} + +u32 intel_tc_port_get_lane_mask(struct intel_digital_port *dig_port) +{ + struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev); + enum tc_port tc_port = intel_port_to_tc(i915, dig_port->base.port); + struct intel_uncore *uncore = &i915->uncore; + u32 lane_mask; + + lane_mask = intel_uncore_read(uncore, + PORT_TX_DFLEXDPSP(dig_port->tc_phy_fia)); + + WARN_ON(lane_mask == 0xffffffff); + + return (lane_mask & DP_LANE_ASSIGNMENT_MASK(tc_port)) >> + DP_LANE_ASSIGNMENT_SHIFT(tc_port); +} + +int intel_tc_port_fia_max_lane_count(struct intel_digital_port *dig_port) +{ + struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev); + intel_wakeref_t wakeref; + u32 lane_mask; + + if (dig_port->tc_mode != TC_PORT_DP_ALT) + return 4; + + lane_mask = 0; + with_intel_display_power(i915, POWER_DOMAIN_DISPLAY_CORE, wakeref) + lane_mask = intel_tc_port_get_lane_mask(dig_port); + + switch (lane_mask) { + default: + MISSING_CASE(lane_mask); + /* fall-through */ + case 0x1: + case 0x2: + case 0x4: + case 0x8: + return 1; + case 0x3: + case 0xc: + return 2; + case 0xf: + return 4; + } +} + +void intel_tc_port_set_fia_lane_count(struct intel_digital_port *dig_port, + int required_lanes) +{ + struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev); + enum tc_port tc_port = intel_port_to_tc(i915, dig_port->base.port); + bool lane_reversal = dig_port->saved_port_bits & DDI_BUF_PORT_REVERSAL; + struct intel_uncore *uncore = &i915->uncore; + u32 val; + + WARN_ON(lane_reversal && dig_port->tc_mode != TC_PORT_LEGACY); + + val = intel_uncore_read(uncore, + PORT_TX_DFLEXDPMLE1(dig_port->tc_phy_fia)); + val &= ~DFLEXDPMLE1_DPMLETC_MASK(tc_port); + + switch (required_lanes) { + case 1: + val |= lane_reversal ? DFLEXDPMLE1_DPMLETC_ML3(tc_port) : + DFLEXDPMLE1_DPMLETC_ML0(tc_port); + break; + case 2: + val |= lane_reversal ? DFLEXDPMLE1_DPMLETC_ML3_2(tc_port) : + DFLEXDPMLE1_DPMLETC_ML1_0(tc_port); + break; + case 4: + val |= DFLEXDPMLE1_DPMLETC_ML3_0(tc_port); + break; + default: + MISSING_CASE(required_lanes); + } + + intel_uncore_write(uncore, + PORT_TX_DFLEXDPMLE1(dig_port->tc_phy_fia), val); +} + +static void tc_port_fixup_legacy_flag(struct intel_digital_port *dig_port, + u32 live_status_mask) +{ + u32 valid_hpd_mask; + + if (dig_port->tc_legacy_port) + valid_hpd_mask = BIT(TC_PORT_LEGACY); + else + valid_hpd_mask = BIT(TC_PORT_DP_ALT) | + BIT(TC_PORT_TBT_ALT); + + if (!(live_status_mask & ~valid_hpd_mask)) + return; + + /* If live status mismatches the VBT flag, trust the live status. */ + DRM_ERROR("Port %s: live status %08x mismatches the legacy port flag, fix flag\n", + dig_port->tc_port_name, live_status_mask); + + dig_port->tc_legacy_port = !dig_port->tc_legacy_port; +} + +static u32 tc_port_live_status_mask(struct intel_digital_port *dig_port) +{ + struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev); + enum tc_port tc_port = intel_port_to_tc(i915, dig_port->base.port); + struct intel_uncore *uncore = &i915->uncore; + u32 mask = 0; + u32 val; + + val = intel_uncore_read(uncore, + PORT_TX_DFLEXDPSP(dig_port->tc_phy_fia)); + + if (val == 0xffffffff) { + DRM_DEBUG_KMS("Port %s: PHY in TCCOLD, nothing connected\n", + dig_port->tc_port_name); + return mask; + } + + if (val & TC_LIVE_STATE_TBT(tc_port)) + mask |= BIT(TC_PORT_TBT_ALT); + if (val & TC_LIVE_STATE_TC(tc_port)) + mask |= BIT(TC_PORT_DP_ALT); + + if (intel_uncore_read(uncore, SDEISR) & SDE_TC_HOTPLUG_ICP(tc_port)) + mask |= BIT(TC_PORT_LEGACY); + + /* The sink can be connected only in a single mode. */ + if (!WARN_ON(hweight32(mask) > 1)) + tc_port_fixup_legacy_flag(dig_port, mask); + + return mask; +} + +static bool icl_tc_phy_status_complete(struct intel_digital_port *dig_port) +{ + struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev); + enum tc_port tc_port = intel_port_to_tc(i915, dig_port->base.port); + struct intel_uncore *uncore = &i915->uncore; + u32 val; + + val = intel_uncore_read(uncore, + PORT_TX_DFLEXDPPMS(dig_port->tc_phy_fia)); + if (val == 0xffffffff) { + DRM_DEBUG_KMS("Port %s: PHY in TCCOLD, assuming not complete\n", + dig_port->tc_port_name); + return false; + } + + return val & DP_PHY_MODE_STATUS_COMPLETED(tc_port); +} + +static bool icl_tc_phy_set_safe_mode(struct intel_digital_port *dig_port, + bool enable) +{ + struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev); + enum tc_port tc_port = intel_port_to_tc(i915, dig_port->base.port); + struct intel_uncore *uncore = &i915->uncore; + u32 val; + + val = intel_uncore_read(uncore, + PORT_TX_DFLEXDPCSSS(dig_port->tc_phy_fia)); + if (val == 0xffffffff) { + DRM_DEBUG_KMS("Port %s: PHY in TCCOLD, can't set safe-mode to %s\n", + dig_port->tc_port_name, + enableddisabled(enable)); + + return false; + } + + val &= ~DP_PHY_MODE_STATUS_NOT_SAFE(tc_port); + if (!enable) + val |= DP_PHY_MODE_STATUS_NOT_SAFE(tc_port); + + intel_uncore_write(uncore, + PORT_TX_DFLEXDPCSSS(dig_port->tc_phy_fia), val); + + if (enable && wait_for(!icl_tc_phy_status_complete(dig_port), 10)) + DRM_DEBUG_KMS("Port %s: PHY complete clear timed out\n", + dig_port->tc_port_name); + + return true; +} + +static bool icl_tc_phy_is_in_safe_mode(struct intel_digital_port *dig_port) +{ + struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev); + enum tc_port tc_port = intel_port_to_tc(i915, dig_port->base.port); + struct intel_uncore *uncore = &i915->uncore; + u32 val; + + val = intel_uncore_read(uncore, + PORT_TX_DFLEXDPCSSS(dig_port->tc_phy_fia)); + if (val == 0xffffffff) { + DRM_DEBUG_KMS("Port %s: PHY in TCCOLD, assume safe mode\n", + dig_port->tc_port_name); + return true; + } + + return !(val & DP_PHY_MODE_STATUS_NOT_SAFE(tc_port)); +} + +/* + * This function implements the first part of the Connect Flow described by our + * specification, Gen11 TypeC Programming chapter. The rest of the flow (reading + * lanes, EDID, etc) is done as needed in the typical places. + * + * Unlike the other ports, type-C ports are not available to use as soon as we + * get a hotplug. The type-C PHYs can be shared between multiple controllers: + * display, USB, etc. As a result, handshaking through FIA is required around + * connect and disconnect to cleanly transfer ownership with the controller and + * set the type-C power state. + */ +static void icl_tc_phy_connect(struct intel_digital_port *dig_port, + int required_lanes) +{ + int max_lanes; + + if (!icl_tc_phy_status_complete(dig_port)) { + DRM_DEBUG_KMS("Port %s: PHY not ready\n", + dig_port->tc_port_name); + goto out_set_tbt_alt_mode; + } + + if (!icl_tc_phy_set_safe_mode(dig_port, false) && + !WARN_ON(dig_port->tc_legacy_port)) + goto out_set_tbt_alt_mode; + + max_lanes = intel_tc_port_fia_max_lane_count(dig_port); + if (dig_port->tc_legacy_port) { + WARN_ON(max_lanes != 4); + dig_port->tc_mode = TC_PORT_LEGACY; + + return; + } + + /* + * Now we have to re-check the live state, in case the port recently + * became disconnected. Not necessary for legacy mode. + */ + if (!(tc_port_live_status_mask(dig_port) & BIT(TC_PORT_DP_ALT))) { + DRM_DEBUG_KMS("Port %s: PHY sudden disconnect\n", + dig_port->tc_port_name); + goto out_set_safe_mode; + } + + if (max_lanes < required_lanes) { + DRM_DEBUG_KMS("Port %s: PHY max lanes %d < required lanes %d\n", + dig_port->tc_port_name, + max_lanes, required_lanes); + goto out_set_safe_mode; + } + + dig_port->tc_mode = TC_PORT_DP_ALT; + + return; + +out_set_safe_mode: + icl_tc_phy_set_safe_mode(dig_port, true); +out_set_tbt_alt_mode: + dig_port->tc_mode = TC_PORT_TBT_ALT; +} + +/* + * See the comment at the connect function. This implements the Disconnect + * Flow. + */ +static void icl_tc_phy_disconnect(struct intel_digital_port *dig_port) +{ + switch (dig_port->tc_mode) { + case TC_PORT_LEGACY: + /* Nothing to do, we never disconnect from legacy mode */ + break; + case TC_PORT_DP_ALT: + icl_tc_phy_set_safe_mode(dig_port, true); + dig_port->tc_mode = TC_PORT_TBT_ALT; + break; + case TC_PORT_TBT_ALT: + /* Nothing to do, we stay in TBT-alt mode */ + break; + default: + MISSING_CASE(dig_port->tc_mode); + } +} + +static bool icl_tc_phy_is_connected(struct intel_digital_port *dig_port) +{ + if (!icl_tc_phy_status_complete(dig_port)) { + DRM_DEBUG_KMS("Port %s: PHY status not complete\n", + dig_port->tc_port_name); + return dig_port->tc_mode == TC_PORT_TBT_ALT; + } + + if (icl_tc_phy_is_in_safe_mode(dig_port)) { + DRM_DEBUG_KMS("Port %s: PHY still in safe mode\n", + dig_port->tc_port_name); + + return false; + } + + return dig_port->tc_mode == TC_PORT_DP_ALT || + dig_port->tc_mode == TC_PORT_LEGACY; +} + +static enum tc_port_mode +intel_tc_port_get_current_mode(struct intel_digital_port *dig_port) +{ + u32 live_status_mask = tc_port_live_status_mask(dig_port); + bool in_safe_mode = icl_tc_phy_is_in_safe_mode(dig_port); + enum tc_port_mode mode; + + if (in_safe_mode || WARN_ON(!icl_tc_phy_status_complete(dig_port))) + return TC_PORT_TBT_ALT; + + mode = dig_port->tc_legacy_port ? TC_PORT_LEGACY : TC_PORT_DP_ALT; + if (live_status_mask) { + enum tc_port_mode live_mode = fls(live_status_mask) - 1; + + if (!WARN_ON(live_mode == TC_PORT_TBT_ALT)) + mode = live_mode; + } + + return mode; +} + +static enum tc_port_mode +intel_tc_port_get_target_mode(struct intel_digital_port *dig_port) +{ + u32 live_status_mask = tc_port_live_status_mask(dig_port); + + if (live_status_mask) + return fls(live_status_mask) - 1; + + return icl_tc_phy_status_complete(dig_port) && + dig_port->tc_legacy_port ? TC_PORT_LEGACY : + TC_PORT_TBT_ALT; +} + +static void intel_tc_port_reset_mode(struct intel_digital_port *dig_port, + int required_lanes) +{ + struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev); + enum tc_port_mode old_tc_mode = dig_port->tc_mode; + + intel_display_power_flush_work(i915); + WARN_ON(intel_display_power_is_enabled(i915, + intel_aux_power_domain(dig_port))); + + icl_tc_phy_disconnect(dig_port); + icl_tc_phy_connect(dig_port, required_lanes); + + DRM_DEBUG_KMS("Port %s: TC port mode reset (%s -> %s)\n", + dig_port->tc_port_name, + tc_port_mode_name(old_tc_mode), + tc_port_mode_name(dig_port->tc_mode)); +} + +static void +intel_tc_port_link_init_refcount(struct intel_digital_port *dig_port, + int refcount) +{ + WARN_ON(dig_port->tc_link_refcount); + dig_port->tc_link_refcount = refcount; +} + +void intel_tc_port_sanitize(struct intel_digital_port *dig_port) +{ + struct intel_encoder *encoder = &dig_port->base; + int active_links = 0; + + mutex_lock(&dig_port->tc_lock); + + dig_port->tc_mode = intel_tc_port_get_current_mode(dig_port); + if (dig_port->dp.is_mst) + active_links = intel_dp_mst_encoder_active_links(dig_port); + else if (encoder->base.crtc) + active_links = to_intel_crtc(encoder->base.crtc)->active; + + if (active_links) { + if (!icl_tc_phy_is_connected(dig_port)) + DRM_DEBUG_KMS("Port %s: PHY disconnected with %d active link(s)\n", + dig_port->tc_port_name, active_links); + intel_tc_port_link_init_refcount(dig_port, active_links); + + goto out; + } + + if (dig_port->tc_legacy_port) + icl_tc_phy_connect(dig_port, 1); + +out: + DRM_DEBUG_KMS("Port %s: sanitize mode (%s)\n", + dig_port->tc_port_name, + tc_port_mode_name(dig_port->tc_mode)); + + mutex_unlock(&dig_port->tc_lock); +} + +static bool intel_tc_port_needs_reset(struct intel_digital_port *dig_port) +{ + return intel_tc_port_get_target_mode(dig_port) != dig_port->tc_mode; +} + +/* + * The type-C ports are different because even when they are connected, they may + * not be available/usable by the graphics driver: see the comment on + * icl_tc_phy_connect(). So in our driver instead of adding the additional + * concept of "usable" and make everything check for "connected and usable" we + * define a port as "connected" when it is not only connected, but also when it + * is usable by the rest of the driver. That maintains the old assumption that + * connected ports are usable, and avoids exposing to the users objects they + * can't really use. + */ +bool intel_tc_port_connected(struct intel_digital_port *dig_port) +{ + bool is_connected; + + intel_tc_port_lock(dig_port); + is_connected = tc_port_live_status_mask(dig_port) & + BIT(dig_port->tc_mode); + intel_tc_port_unlock(dig_port); + + return is_connected; +} + +static void __intel_tc_port_lock(struct intel_digital_port *dig_port, + int required_lanes) +{ + struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev); + intel_wakeref_t wakeref; + + wakeref = intel_display_power_get(i915, POWER_DOMAIN_DISPLAY_CORE); + + mutex_lock(&dig_port->tc_lock); + + if (!dig_port->tc_link_refcount && + intel_tc_port_needs_reset(dig_port)) + intel_tc_port_reset_mode(dig_port, required_lanes); + + WARN_ON(dig_port->tc_lock_wakeref); + dig_port->tc_lock_wakeref = wakeref; +} + +void intel_tc_port_lock(struct intel_digital_port *dig_port) +{ + __intel_tc_port_lock(dig_port, 1); +} + +void intel_tc_port_unlock(struct intel_digital_port *dig_port) +{ + struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev); + intel_wakeref_t wakeref = fetch_and_zero(&dig_port->tc_lock_wakeref); + + mutex_unlock(&dig_port->tc_lock); + + intel_display_power_put_async(i915, POWER_DOMAIN_DISPLAY_CORE, + wakeref); +} + +bool intel_tc_port_ref_held(struct intel_digital_port *dig_port) +{ + return mutex_is_locked(&dig_port->tc_lock) || + dig_port->tc_link_refcount; +} + +void intel_tc_port_get_link(struct intel_digital_port *dig_port, + int required_lanes) +{ + __intel_tc_port_lock(dig_port, required_lanes); + dig_port->tc_link_refcount++; + intel_tc_port_unlock(dig_port); +} + +void intel_tc_port_put_link(struct intel_digital_port *dig_port) +{ + mutex_lock(&dig_port->tc_lock); + dig_port->tc_link_refcount--; + mutex_unlock(&dig_port->tc_lock); +} + +void intel_tc_port_init(struct intel_digital_port *dig_port, bool is_legacy) +{ + struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev); + enum port port = dig_port->base.port; + enum tc_port tc_port = intel_port_to_tc(i915, port); + + if (WARN_ON(tc_port == PORT_TC_NONE)) + return; + + snprintf(dig_port->tc_port_name, sizeof(dig_port->tc_port_name), + "%c/TC#%d", port_name(port), tc_port + 1); + + mutex_init(&dig_port->tc_lock); + dig_port->tc_legacy_port = is_legacy; + dig_port->tc_link_refcount = 0; + dig_port->tc_phy_fia = tc_port_to_fia(i915, tc_port); +} |