/* * Copyright © 2006-2007 Intel Corporation * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), * to deal in the Software without restriction, including without limitation * the rights to use, copy, modify, merge, publish, distribute, sublicense, * and/or sell copies of the Software, and to permit persons to whom the * Software is furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice (including the next * paragraph) shall be included in all copies or substantial portions of the * Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER * DEALINGS IN THE SOFTWARE. * * Authors: * Eric Anholt */ #include #include #include #include #include #include #include #include "intel_drv.h" #include #include "i915_drv.h" /* Here's the desired hotplug mode */ #define ADPA_HOTPLUG_BITS (ADPA_CRT_HOTPLUG_PERIOD_128 | \ ADPA_CRT_HOTPLUG_WARMUP_10MS | \ ADPA_CRT_HOTPLUG_SAMPLE_4S | \ ADPA_CRT_HOTPLUG_VOLTAGE_50 | \ ADPA_CRT_HOTPLUG_VOLREF_325MV | \ ADPA_CRT_HOTPLUG_ENABLE) struct intel_crt { struct intel_encoder base; bool force_hotplug_required; u32 adpa_reg; }; static struct intel_crt *intel_attached_crt(struct drm_connector *connector) { return container_of(intel_attached_encoder(connector), struct intel_crt, base); } static struct intel_crt *intel_encoder_to_crt(struct intel_encoder *encoder) { return container_of(encoder, struct intel_crt, base); } static bool intel_crt_get_hw_state(struct intel_encoder *encoder, enum pipe *pipe) { struct drm_device *dev = encoder->base.dev; struct drm_i915_private *dev_priv = dev->dev_private; struct intel_crt *crt = intel_encoder_to_crt(encoder); u32 tmp; tmp = I915_READ(crt->adpa_reg); if (!(tmp & ADPA_DAC_ENABLE)) return false; if (HAS_PCH_CPT(dev)) *pipe = PORT_TO_PIPE_CPT(tmp); else *pipe = PORT_TO_PIPE(tmp); return true; } static void intel_disable_crt(struct intel_encoder *encoder) { struct drm_i915_private *dev_priv = encoder->base.dev->dev_private; struct intel_crt *crt = intel_encoder_to_crt(encoder); u32 temp; temp = I915_READ(crt->adpa_reg); temp &= ~(ADPA_HSYNC_CNTL_DISABLE | ADPA_VSYNC_CNTL_DISABLE); temp &= ~ADPA_DAC_ENABLE; I915_WRITE(crt->adpa_reg, temp); } static void intel_enable_crt(struct intel_encoder *encoder) { struct drm_i915_private *dev_priv = encoder->base.dev->dev_private; struct intel_crt *crt = intel_encoder_to_crt(encoder); u32 temp; temp = I915_READ(crt->adpa_reg); temp |= ADPA_DAC_ENABLE; I915_WRITE(crt->adpa_reg, temp); } /* Note: The caller is required to filter out dpms modes not supported by the * platform. */ static void intel_crt_set_dpms(struct intel_encoder *encoder, int mode) { struct drm_device *dev = encoder->base.dev; struct drm_i915_private *dev_priv = dev->dev_private; struct intel_crt *crt = intel_encoder_to_crt(encoder); u32 temp; temp = I915_READ(crt->adpa_reg); temp &= ~(ADPA_HSYNC_CNTL_DISABLE | ADPA_VSYNC_CNTL_DISABLE); temp &= ~ADPA_DAC_ENABLE; switch (mode) { case DRM_MODE_DPMS_ON: temp |= ADPA_DAC_ENABLE; break; case DRM_MODE_DPMS_STANDBY: temp |= ADPA_DAC_ENABLE | ADPA_HSYNC_CNTL_DISABLE; break; case DRM_MODE_DPMS_SUSPEND: temp |= ADPA_DAC_ENABLE | ADPA_VSYNC_CNTL_DISABLE; break; case DRM_MODE_DPMS_OFF: temp |= ADPA_HSYNC_CNTL_DISABLE | ADPA_VSYNC_CNTL_DISABLE; break; } I915_WRITE(crt->adpa_reg, temp); } static void intel_crt_dpms(struct drm_connector *connector, int mode) { struct drm_device *dev = connector->dev; struct intel_encoder *encoder = intel_attached_encoder(connector); struct drm_crtc *crtc; int old_dpms; /* PCH platforms and VLV only support on/off. */ if (INTEL_INFO(dev)->gen < 5 && mode != DRM_MODE_DPMS_ON) mode = DRM_MODE_DPMS_OFF; if (mode == connector->dpms) return; old_dpms = connector->dpms; connector->dpms = mode; /* Only need to change hw state when actually enabled */ crtc = encoder->base.crtc; if (!crtc) { encoder->connectors_active = false; return; } /* We need the pipe to run for anything but OFF. */ if (mode == DRM_MODE_DPMS_OFF) encoder->connectors_active = false; else encoder->connectors_active = true; if (mode < old_dpms) { /* From off to on, enable the pipe first. */ intel_crtc_update_dpms(crtc); intel_crt_set_dpms(encoder, mode); } else { intel_crt_set_dpms(encoder, mode); intel_crtc_update_dpms(crtc); } intel_modeset_check_state(connector->dev); } static int intel_crt_mode_valid(struct drm_connector *connector, struct drm_display_mode *mode) { struct drm_device *dev = connector->dev; int max_clock = 0; if (mode->flags & DRM_MODE_FLAG_DBLSCAN) return MODE_NO_DBLESCAN; if (mode->clock < 25000) return MODE_CLOCK_LOW; if (IS_GEN2(dev)) max_clock = 350000; else max_clock = 400000; if (mode->clock > max_clock) return MODE_CLOCK_HIGH; /* The FDI receiver on LPT only supports 8bpc and only has 2 lanes. */ if (HAS_PCH_LPT(dev) && (ironlake_get_lanes_required(mode->clock, 270000, 24) > 2)) return MODE_CLOCK_HIGH; return MODE_OK; } static bool intel_crt_mode_fixup(struct drm_encoder *encoder, const struct drm_display_mode *mode, struct drm_display_mode *adjusted_mode) { return true; } static void intel_crt_mode_set(struct drm_encoder *encoder, struct drm_display_mode *mode, struct drm_display_mode *adjusted_mode) { struct drm_device *dev = encoder->dev; struct drm_crtc *crtc = encoder->crtc; struct intel_crt *crt = intel_encoder_to_crt(to_intel_encoder(encoder)); struct intel_crtc *intel_crtc = to_intel_crtc(crtc); struct drm_i915_private *dev_priv = dev->dev_private; u32 adpa; if (HAS_PCH_SPLIT(dev)) adpa = ADPA_HOTPLUG_BITS; else adpa = 0; if (adjusted_mode->flags & DRM_MODE_FLAG_PHSYNC) adpa |= ADPA_HSYNC_ACTIVE_HIGH; if (adjusted_mode->flags & DRM_MODE_FLAG_PVSYNC) adpa |= ADPA_VSYNC_ACTIVE_HIGH; /* For CPT allow 3 pipe config, for others just use A or B */ if (HAS_PCH_LPT(dev)) ; /* Those bits don't exist here */ else if (HAS_PCH_CPT(dev)) adpa |= PORT_TRANS_SEL_CPT(intel_crtc->pipe); else if (intel_crtc->pipe == 0) adpa |= ADPA_PIPE_A_SELECT; else adpa |= ADPA_PIPE_B_SELECT; if (!HAS_PCH_SPLIT(dev)) I915_WRITE(BCLRPAT(intel_crtc->pipe), 0); I915_WRITE(crt->adpa_reg, adpa); } static bool intel_ironlake_crt_detect_hotplug(struct drm_connector *connector) { struct drm_device *dev = connector->dev; struct intel_crt *crt = intel_attached_crt(connector); struct drm_i915_private *dev_priv = dev->dev_private; u32 adpa; bool ret; /* The first time through, trigger an explicit detection cycle */ if (crt->force_hotplug_required) { bool turn_off_dac = HAS_PCH_SPLIT(dev); u32 save_adpa; crt->force_hotplug_required = 0; save_adpa = adpa = I915_READ(PCH_ADPA); DRM_DEBUG_KMS("trigger hotplug detect cycle: adpa=0x%x\n", adpa); adpa |= ADPA_CRT_HOTPLUG_FORCE_TRIGGER; if (turn_off_dac) adpa &= ~ADPA_DAC_ENABLE; I915_WRITE(PCH_ADPA, adpa); if (wait_for((I915_READ(PCH_ADPA) & ADPA_CRT_HOTPLUG_FORCE_TRIGGER) == 0, 1000)) DRM_DEBUG_KMS("timed out waiting for FORCE_TRIGGER"); if (turn_off_dac) { I915_WRITE(PCH_ADPA, save_adpa); POSTING_READ(PCH_ADPA); } } /* Check the status to see if both blue and green are on now */ adpa = I915_READ(PCH_ADPA); if ((adpa & ADPA_CRT_HOTPLUG_MONITOR_MASK) != 0) ret = true; else ret = false; DRM_DEBUG_KMS("ironlake hotplug adpa=0x%x, result %d\n", adpa, ret); return ret; } static bool valleyview_crt_detect_hotplug(struct drm_connector *connector) { struct drm_device *dev = connector->dev; struct drm_i915_private *dev_priv = dev->dev_private; u32 adpa; bool ret; u32 save_adpa; save_adpa = adpa = I915_READ(ADPA); DRM_DEBUG_KMS("trigger hotplug detect cycle: adpa=0x%x\n", adpa); adpa |= ADPA_CRT_HOTPLUG_FORCE_TRIGGER; I915_WRITE(ADPA, adpa); if (wait_for((I915_READ(ADPA) & ADPA_CRT_HOTPLUG_FORCE_TRIGGER) == 0, 1000)) { DRM_DEBUG_KMS("timed out waiting for FORCE_TRIGGER"); I915_WRITE(ADPA, save_adpa); } /* Check the status to see if both blue and green are on now */ adpa = I915_READ(ADPA); if ((adpa & ADPA_CRT_HOTPLUG_MONITOR_MASK) != 0) ret = true; else ret = false; DRM_DEBUG_KMS("valleyview hotplug adpa=0x%x, result %d\n", adpa, ret); /* FIXME: debug force function and remove */ ret = true; return ret; } /** * Uses CRT_HOTPLUG_EN and CRT_HOTPLUG_STAT to detect CRT presence. * * Not for i915G/i915GM * * \return true if CRT is connected. * \return false if CRT is disconnected. */ static bool intel_crt_detect_hotplug(struct drm_connector *connector) { struct drm_device *dev = connector->dev; struct drm_i915_private *dev_priv = dev->dev_private; u32 hotplug_en, orig, stat; bool ret = false; int i, tries = 0; if (HAS_PCH_SPLIT(dev)) return intel_ironlake_crt_detect_hotplug(connector); if (IS_VALLEYVIEW(dev)) return valleyview_crt_detect_hotplug(connector); /* * On 4 series desktop, CRT detect sequence need to be done twice * to get a reliable result. */ if (IS_G4X(dev) && !IS_GM45(dev)) tries = 2; else tries = 1; hotplug_en = orig = I915_READ(PORT_HOTPLUG_EN); hotplug_en |= CRT_HOTPLUG_FORCE_DETECT; for (i = 0; i < tries ; i++) { /* turn on the FORCE_DETECT */ I915_WRITE(PORT_HOTPLUG_EN, hotplug_en); /* wait for FORCE_DETECT to go off */ if (wait_for((I915_READ(PORT_HOTPLUG_EN) & CRT_HOTPLUG_FORCE_DETECT) == 0, 1000)) DRM_DEBUG_KMS("timed out waiting for FORCE_DETECT to go off"); } stat = I915_READ(PORT_HOTPLUG_STAT); if ((stat & CRT_HOTPLUG_MONITOR_MASK) != CRT_HOTPLUG_MONITOR_NONE) ret = true; /* clear the interrupt we just generated, if any */ I915_WRITE(PORT_HOTPLUG_STAT, CRT_HOTPLUG_INT_STATUS); /* and put the bits back */ I915_WRITE(PORT_HOTPLUG_EN, orig); return ret; } static struct edid *intel_crt_get_edid(struct drm_connector *connector, struct i2c_adapter *i2c) { struct edid *edid; edid = drm_get_edid(connector, i2c); if (!edid && !intel_gmbus_is_forced_bit(i2c)) { DRM_DEBUG_KMS("CRT GMBUS EDID read failed, retry using GPIO bit-banging\n"); intel_gmbus_force_bit(i2c, true); edid = drm_get_edid(connector, i2c); intel_gmbus_force_bit(i2c, false); } return edid; } /* local version of intel_ddc_get_modes() to use intel_crt_get_edid() */ static int intel_crt_ddc_get_modes(struct drm_connector *connector, struct i2c_adapter *adapter) { struct edid *edid; int ret; edid = intel_crt_get_edid(connector, adapter); if (!edid) return 0; ret = intel_connector_update_modes(connector, edid); kfree(edid); return ret; } static bool intel_crt_detect_ddc(struct drm_connector *connector) { struct intel_crt *crt = intel_attached_crt(connector); struct drm_i915_private *dev_priv = crt->base.base.dev->dev_private; struct edid *edid; struct i2c_adapter *i2c; BUG_ON(crt->base.type != INTEL_OUTPUT_ANALOG); i2c = intel_gmbus_get_adapter(dev_priv, dev_priv->crt_ddc_pin); edid = intel_crt_get_edid(connector, i2c); if (edid) { bool is_digital = edid->input & DRM_EDID_INPUT_DIGITAL; /* * This may be a DVI-I connector with a shared DDC * link between analog and digital outputs, so we * have to check the EDID input spec of the attached device. */ if (!is_digital) { DRM_DEBUG_KMS("CRT detected via DDC:0x50 [EDID]\n"); return true; } DRM_DEBUG_KMS("CRT not detected via DDC:0x50 [EDID reports a digital panel]\n"); } else { DRM_DEBUG_KMS("CRT not detected via DDC:0x50 [no valid EDID found]\n"); } kfree(edid); return false; } static enum drm_connector_status intel_crt_load_detect(struct intel_crt *crt) { struct drm_device *dev = crt->base.base.dev; struct drm_i915_private *dev_priv = dev->dev_private; uint32_t pipe = to_intel_crtc(crt->base.base.crtc)->pipe; uint32_t save_bclrpat; uint32_t save_vtotal; uint32_t vtotal, vactive; uint32_t vsample; uint32_t vblank, vblank_start, vblank_end; uint32_t dsl; uint32_t bclrpat_reg; uint32_t vtotal_reg; uint32_t vblank_reg; uint32_t vsync_reg; uint32_t pipeconf_reg; uint32_t pipe_dsl_reg; uint8_t st00; enum drm_connector_status status; DRM_DEBUG_KMS("starting load-detect on CRT\n"); bclrpat_reg = BCLRPAT(pipe); vtotal_reg = VTOTAL(pipe); vblank_reg = VBLANK(pipe); vsync_reg = VSYNC(pipe); pipeconf_reg = PIPECONF(pipe); pipe_dsl_reg = PIPEDSL(pipe); save_bclrpat = I915_READ(bclrpat_reg); save_vtotal = I915_READ(vtotal_reg); vblank = I915_READ(vblank_reg); vtotal = ((save_vtotal >> 16) & 0xfff) + 1; vactive = (save_vtotal & 0x7ff) + 1; vblank_start = (vblank & 0xfff) + 1; vblank_end = ((vblank >> 16) & 0xfff) + 1; /* Set the border color to purple. */ I915_WRITE(bclrpat_reg, 0x500050); if (!IS_GEN2(dev)) { uint32_t pipeconf = I915_READ(pipeconf_reg); I915_WRITE(pipeconf_reg, pipeconf | PIPECONF_FORCE_BORDER); POSTING_READ(pipeconf_reg); /* Wait for next Vblank to substitue * border color for Color info */ intel_wait_for_vblank(dev, pipe); st00 = I915_READ8(VGA_MSR_WRITE); status = ((st00 & (1 << 4)) != 0) ? connector_status_connected : connector_status_disconnected; I915_WRITE(pipeconf_reg, pipeconf); } else { bool restore_vblank = false; int count, detect; /* * If there isn't any border, add some. * Yes, this will flicker */ if (vblank_start <= vactive && vblank_end >= vtotal) { uint32_t vsync = I915_READ(vsync_reg); uint32_t vsync_start = (vsync & 0xffff) + 1; vblank_start = vsync_start; I915_WRITE(vblank_reg, (vblank_start - 1) | ((vblank_end - 1) << 16)); restore_vblank = true; } /* sample in the vertical border, selecting the larger one */ if (vblank_start - vactive >= vtotal - vblank_end) vsample = (vblank_start + vactive) >> 1; else vsample = (vtotal + vblank_end) >> 1; /* * Wait for the border to be displayed */ while (I915_READ(pipe_dsl_reg) >= vactive) ; while ((dsl = I915_READ(pipe_dsl_reg)) <= vsample) ; /* * Watch ST00 for an entire scanline */ detect = 0; count = 0; do { count++; /* Read the ST00 VGA status register */ st00 = I915_READ8(VGA_MSR_WRITE); if (st00 & (1 << 4)) detect++; } while ((I915_READ(pipe_dsl_reg) == dsl)); /* restore vblank if necessary */ if (restore_vblank) I915_WRITE(vblank_reg, vblank); /* * If more than 3/4 of the scanline detected a monitor, * then it is assumed to be present. This works even on i830, * where there isn't any way to force the border color across * the screen */ status = detect * 4 > count * 3 ? connector_status_connected : connector_status_disconnected; } /* Restore previous settings */ I915_WRITE(bclrpat_reg, save_bclrpat); return status; } static enum drm_connector_status intel_crt_detect(struct drm_connector *connector, bool force) { struct drm_device *dev = connector->dev; struct intel_crt *crt = intel_attached_crt(connector); enum drm_connector_status status; struct intel_load_detect_pipe tmp; if (I915_HAS_HOTPLUG(dev)) { /* We can not rely on the HPD pin always being correctly wired * up, for example many KVM do not pass it through, and so * only trust an assertion that the monitor is connected. */ if (intel_crt_detect_hotplug(connector)) { DRM_DEBUG_KMS("CRT detected via hotplug\n"); return connector_status_connected; } else DRM_DEBUG_KMS("CRT not detected via hotplug\n"); } if (intel_crt_detect_ddc(connector)) return connector_status_connected; /* Load detection is broken on HPD capable machines. Whoever wants a * broken monitor (without edid) to work behind a broken kvm (that fails * to have the right resistors for HP detection) needs to fix this up. * For now just bail out. */ if (I915_HAS_HOTPLUG(dev)) return connector_status_disconnected; if (!force) return connector->status; /* for pre-945g platforms use load detect */ if (intel_get_load_detect_pipe(connector, NULL, &tmp)) { if (intel_crt_detect_ddc(connector)) status = connector_status_connected; else status = intel_crt_load_detect(crt); intel_release_load_detect_pipe(connector, &tmp); } else status = connector_status_unknown; return status; } static void intel_crt_destroy(struct drm_connector *connector) { drm_sysfs_connector_remove(connector); drm_connector_cleanup(connector); kfree(connector); } static int intel_crt_get_modes(struct drm_connector *connector) { struct drm_device *dev = connector->dev; struct drm_i915_private *dev_priv = dev->dev_private; int ret; struct i2c_adapter *i2c; i2c = intel_gmbus_get_adapter(dev_priv, dev_priv->crt_ddc_pin); ret = intel_crt_ddc_get_modes(connector, i2c); if (ret || !IS_G4X(dev)) return ret; /* Try to probe digital port for output in DVI-I -> VGA mode. */ i2c = intel_gmbus_get_adapter(dev_priv, GMBUS_PORT_DPB); return intel_crt_ddc_get_modes(connector, i2c); } static int intel_crt_set_property(struct drm_connector *connector, struct drm_property *property, uint64_t value) { return 0; } static void intel_crt_reset(struct drm_connector *connector) { struct drm_device *dev = connector->dev; struct drm_i915_private *dev_priv = dev->dev_private; struct intel_crt *crt = intel_attached_crt(connector); if (HAS_PCH_SPLIT(dev)) { u32 adpa; adpa = I915_READ(PCH_ADPA); adpa &= ~ADPA_CRT_HOTPLUG_MASK; adpa |= ADPA_HOTPLUG_BITS; I915_WRITE(PCH_ADPA, adpa); POSTING_READ(PCH_ADPA); DRM_DEBUG_KMS("pch crt adpa set to 0x%x\n", adpa); crt->force_hotplug_required = 1; } } /* * Routines for controlling stuff on the analog port */ static const struct drm_encoder_helper_funcs crt_encoder_funcs = { .mode_fixup = intel_crt_mode_fixup, .mode_set = intel_crt_mode_set, .disable = intel_encoder_noop, }; static const struct drm_connector_funcs intel_crt_connector_funcs = { .reset = intel_crt_reset, .dpms = intel_crt_dpms, .detect = intel_crt_detect, .fill_modes = drm_helper_probe_single_connector_modes, .destroy = intel_crt_destroy, .set_property = intel_crt_set_property, }; static const struct drm_connector_helper_funcs intel_crt_connector_helper_funcs = { .mode_valid = intel_crt_mode_valid, .get_modes = intel_crt_get_modes, .best_encoder = intel_best_encoder, }; static const struct drm_encoder_funcs intel_crt_enc_funcs = { .destroy = intel_encoder_destroy, }; static int __init intel_no_crt_dmi_callback(const struct dmi_system_id *id) { DRM_INFO("Skipping CRT initialization for %s\n", id->ident); return 1; } static const struct dmi_system_id intel_no_crt[] = { { .callback = intel_no_crt_dmi_callback, .ident = "ACER ZGB", .matches = { DMI_MATCH(DMI_SYS_VENDOR, "ACER"), DMI_MATCH(DMI_PRODUCT_NAME, "ZGB"), }, }, { } }; void intel_crt_init(struct drm_device *dev) { struct drm_connector *connector; struct intel_crt *crt; struct intel_connector *intel_connector; struct drm_i915_private *dev_priv = dev->dev_private; /* Skip machines without VGA that falsely report hotplug events */ if (dmi_check_system(intel_no_crt)) return; crt = kzalloc(sizeof(struct intel_crt), GFP_KERNEL); if (!crt) return; intel_connector = kzalloc(sizeof(struct intel_connector), GFP_KERNEL); if (!intel_connector) { kfree(crt); return; } connector = &intel_connector->base; drm_connector_init(dev, &intel_connector->base, &intel_crt_connector_funcs, DRM_MODE_CONNECTOR_VGA); drm_encoder_init(dev, &crt->base.base, &intel_crt_enc_funcs, DRM_MODE_ENCODER_DAC); intel_connector_attach_encoder(intel_connector, &crt->base); crt->base.type = INTEL_OUTPUT_ANALOG; crt->base.cloneable = true; if (IS_I830(dev)) crt->base.crtc_mask = (1 << 0); else crt->base.crtc_mask = (1 << 0) | (1 << 1) | (1 << 2); if (IS_GEN2(dev)) connector->interlace_allowed = 0; else connector->interlace_allowed = 1; connector->doublescan_allowed = 0; if (HAS_PCH_SPLIT(dev)) crt->adpa_reg = PCH_ADPA; else if (IS_VALLEYVIEW(dev)) crt->adpa_reg = VLV_ADPA; else crt->adpa_reg = ADPA; crt->base.disable = intel_disable_crt; crt->base.enable = intel_enable_crt; if (IS_HASWELL(dev)) crt->base.get_hw_state = intel_ddi_get_hw_state; else crt->base.get_hw_state = intel_crt_get_hw_state; intel_connector->get_hw_state = intel_connector_get_hw_state; drm_encoder_helper_add(&crt->base.base, &crt_encoder_funcs); drm_connector_helper_add(connector, &intel_crt_connector_helper_funcs); drm_sysfs_connector_add(connector); if (I915_HAS_HOTPLUG(dev)) connector->polled = DRM_CONNECTOR_POLL_HPD; else connector->polled = DRM_CONNECTOR_POLL_CONNECT; /* * Configure the automatic hotplug detection stuff */ crt->force_hotplug_required = 0; dev_priv->hotplug_supported_mask |= CRT_HOTPLUG_INT_STATUS; /* * TODO: find a proper way to discover whether we need to set the * polarity reversal bit or not, instead of relying on the BIOS. */ if (HAS_PCH_LPT(dev)) dev_priv->fdi_rx_polarity_reversed = !!(I915_READ(_FDI_RXA_CTL) & FDI_RX_POLARITY_REVERSED_LPT); }