diff options
Diffstat (limited to 'drivers/gpu/drm/gma500/cdv_intel_lvds.c')
| -rw-r--r-- | drivers/gpu/drm/gma500/cdv_intel_lvds.c | 668 |
1 files changed, 668 insertions, 0 deletions
diff --git a/drivers/gpu/drm/gma500/cdv_intel_lvds.c b/drivers/gpu/drm/gma500/cdv_intel_lvds.c new file mode 100644 index 000000000..eaaf4efec --- /dev/null +++ b/drivers/gpu/drm/gma500/cdv_intel_lvds.c @@ -0,0 +1,668 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright © 2006-2011 Intel Corporation + * + * Authors: + * Eric Anholt <eric@anholt.net> + * Dave Airlie <airlied@linux.ie> + * Jesse Barnes <jesse.barnes@intel.com> + */ + +#include <linux/dmi.h> +#include <linux/i2c.h> +#include <linux/pm_runtime.h> + +#include <drm/drm_simple_kms_helper.h> + +#include "cdv_device.h" +#include "intel_bios.h" +#include "power.h" +#include "psb_drv.h" +#include "psb_intel_drv.h" +#include "psb_intel_reg.h" + +/** + * LVDS I2C backlight control macros + */ +#define BRIGHTNESS_MAX_LEVEL 100 +#define BRIGHTNESS_MASK 0xFF +#define BLC_I2C_TYPE 0x01 +#define BLC_PWM_TYPT 0x02 + +#define BLC_POLARITY_NORMAL 0 +#define BLC_POLARITY_INVERSE 1 + +#define PSB_BLC_MAX_PWM_REG_FREQ (0xFFFE) +#define PSB_BLC_MIN_PWM_REG_FREQ (0x2) +#define PSB_BLC_PWM_PRECISION_FACTOR (10) +#define PSB_BACKLIGHT_PWM_CTL_SHIFT (16) +#define PSB_BACKLIGHT_PWM_POLARITY_BIT_CLEAR (0xFFFE) + +struct cdv_intel_lvds_priv { + /** + * Saved LVDO output states + */ + uint32_t savePP_ON; + uint32_t savePP_OFF; + uint32_t saveLVDS; + uint32_t savePP_CONTROL; + uint32_t savePP_CYCLE; + uint32_t savePFIT_CONTROL; + uint32_t savePFIT_PGM_RATIOS; + uint32_t saveBLC_PWM_CTL; +}; + +/* + * Returns the maximum level of the backlight duty cycle field. + */ +static u32 cdv_intel_lvds_get_max_backlight(struct drm_device *dev) +{ + struct drm_psb_private *dev_priv = dev->dev_private; + u32 retval; + + if (gma_power_begin(dev, false)) { + retval = ((REG_READ(BLC_PWM_CTL) & + BACKLIGHT_MODULATION_FREQ_MASK) >> + BACKLIGHT_MODULATION_FREQ_SHIFT) * 2; + + gma_power_end(dev); + } else + retval = ((dev_priv->regs.saveBLC_PWM_CTL & + BACKLIGHT_MODULATION_FREQ_MASK) >> + BACKLIGHT_MODULATION_FREQ_SHIFT) * 2; + + return retval; +} + +/** + * Sets the backlight level. + * + * level backlight level, from 0 to cdv_intel_lvds_get_max_backlight(). + */ +static void cdv_intel_lvds_set_backlight(struct drm_device *dev, int level) +{ + struct drm_psb_private *dev_priv = dev->dev_private; + u32 blc_pwm_ctl; + + if (gma_power_begin(dev, false)) { + blc_pwm_ctl = + REG_READ(BLC_PWM_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK; + REG_WRITE(BLC_PWM_CTL, + (blc_pwm_ctl | + (level << BACKLIGHT_DUTY_CYCLE_SHIFT))); + gma_power_end(dev); + } else { + blc_pwm_ctl = dev_priv->regs.saveBLC_PWM_CTL & + ~BACKLIGHT_DUTY_CYCLE_MASK; + dev_priv->regs.saveBLC_PWM_CTL = (blc_pwm_ctl | + (level << BACKLIGHT_DUTY_CYCLE_SHIFT)); + } +} + +/** + * Sets the power state for the panel. + */ +static void cdv_intel_lvds_set_power(struct drm_device *dev, + struct drm_encoder *encoder, bool on) +{ + struct drm_psb_private *dev_priv = dev->dev_private; + u32 pp_status; + + if (!gma_power_begin(dev, true)) + return; + + if (on) { + REG_WRITE(PP_CONTROL, REG_READ(PP_CONTROL) | + POWER_TARGET_ON); + do { + pp_status = REG_READ(PP_STATUS); + } while ((pp_status & PP_ON) == 0); + + cdv_intel_lvds_set_backlight(dev, + dev_priv->mode_dev.backlight_duty_cycle); + } else { + cdv_intel_lvds_set_backlight(dev, 0); + + REG_WRITE(PP_CONTROL, REG_READ(PP_CONTROL) & + ~POWER_TARGET_ON); + do { + pp_status = REG_READ(PP_STATUS); + } while (pp_status & PP_ON); + } + gma_power_end(dev); +} + +static void cdv_intel_lvds_encoder_dpms(struct drm_encoder *encoder, int mode) +{ + struct drm_device *dev = encoder->dev; + if (mode == DRM_MODE_DPMS_ON) + cdv_intel_lvds_set_power(dev, encoder, true); + else + cdv_intel_lvds_set_power(dev, encoder, false); + /* XXX: We never power down the LVDS pairs. */ +} + +static void cdv_intel_lvds_save(struct drm_connector *connector) +{ +} + +static void cdv_intel_lvds_restore(struct drm_connector *connector) +{ +} + +static enum drm_mode_status cdv_intel_lvds_mode_valid(struct drm_connector *connector, + struct drm_display_mode *mode) +{ + struct drm_device *dev = connector->dev; + struct drm_psb_private *dev_priv = dev->dev_private; + struct drm_display_mode *fixed_mode = + dev_priv->mode_dev.panel_fixed_mode; + + /* just in case */ + if (mode->flags & DRM_MODE_FLAG_DBLSCAN) + return MODE_NO_DBLESCAN; + + /* just in case */ + if (mode->flags & DRM_MODE_FLAG_INTERLACE) + return MODE_NO_INTERLACE; + + if (fixed_mode) { + if (mode->hdisplay > fixed_mode->hdisplay) + return MODE_PANEL; + if (mode->vdisplay > fixed_mode->vdisplay) + return MODE_PANEL; + } + return MODE_OK; +} + +static bool cdv_intel_lvds_mode_fixup(struct drm_encoder *encoder, + const struct drm_display_mode *mode, + struct drm_display_mode *adjusted_mode) +{ + struct drm_device *dev = encoder->dev; + struct drm_psb_private *dev_priv = dev->dev_private; + struct psb_intel_mode_device *mode_dev = &dev_priv->mode_dev; + struct drm_encoder *tmp_encoder; + struct drm_display_mode *panel_fixed_mode = mode_dev->panel_fixed_mode; + + /* Should never happen!! */ + list_for_each_entry(tmp_encoder, &dev->mode_config.encoder_list, + head) { + if (tmp_encoder != encoder + && tmp_encoder->crtc == encoder->crtc) { + pr_err("Can't enable LVDS and another encoder on the same pipe\n"); + return false; + } + } + + /* + * If we have timings from the BIOS for the panel, put them in + * to the adjusted mode. The CRTC will be set up for this mode, + * with the panel scaling set up to source from the H/VDisplay + * of the original mode. + */ + if (panel_fixed_mode != NULL) { + adjusted_mode->hdisplay = panel_fixed_mode->hdisplay; + adjusted_mode->hsync_start = panel_fixed_mode->hsync_start; + adjusted_mode->hsync_end = panel_fixed_mode->hsync_end; + adjusted_mode->htotal = panel_fixed_mode->htotal; + adjusted_mode->vdisplay = panel_fixed_mode->vdisplay; + adjusted_mode->vsync_start = panel_fixed_mode->vsync_start; + adjusted_mode->vsync_end = panel_fixed_mode->vsync_end; + adjusted_mode->vtotal = panel_fixed_mode->vtotal; + adjusted_mode->clock = panel_fixed_mode->clock; + drm_mode_set_crtcinfo(adjusted_mode, + CRTC_INTERLACE_HALVE_V); + } + + /* + * XXX: It would be nice to support lower refresh rates on the + * panels to reduce power consumption, and perhaps match the + * user's requested refresh rate. + */ + + return true; +} + +static void cdv_intel_lvds_prepare(struct drm_encoder *encoder) +{ + struct drm_device *dev = encoder->dev; + struct drm_psb_private *dev_priv = dev->dev_private; + struct psb_intel_mode_device *mode_dev = &dev_priv->mode_dev; + + if (!gma_power_begin(dev, true)) + return; + + mode_dev->saveBLC_PWM_CTL = REG_READ(BLC_PWM_CTL); + mode_dev->backlight_duty_cycle = (mode_dev->saveBLC_PWM_CTL & + BACKLIGHT_DUTY_CYCLE_MASK); + + cdv_intel_lvds_set_power(dev, encoder, false); + + gma_power_end(dev); +} + +static void cdv_intel_lvds_commit(struct drm_encoder *encoder) +{ + struct drm_device *dev = encoder->dev; + struct drm_psb_private *dev_priv = dev->dev_private; + struct psb_intel_mode_device *mode_dev = &dev_priv->mode_dev; + + if (mode_dev->backlight_duty_cycle == 0) + mode_dev->backlight_duty_cycle = + cdv_intel_lvds_get_max_backlight(dev); + + cdv_intel_lvds_set_power(dev, encoder, true); +} + +static void cdv_intel_lvds_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_psb_private *dev_priv = dev->dev_private; + struct gma_crtc *gma_crtc = to_gma_crtc(encoder->crtc); + u32 pfit_control; + + /* + * The LVDS pin pair will already have been turned on in the + * cdv_intel_crtc_mode_set since it has a large impact on the DPLL + * settings. + */ + + /* + * Enable automatic panel scaling so that non-native modes fill the + * screen. Should be enabled before the pipe is enabled, according to + * register description and PRM. + */ + if (mode->hdisplay != adjusted_mode->hdisplay || + mode->vdisplay != adjusted_mode->vdisplay) + pfit_control = (PFIT_ENABLE | VERT_AUTO_SCALE | + HORIZ_AUTO_SCALE | VERT_INTERP_BILINEAR | + HORIZ_INTERP_BILINEAR); + else + pfit_control = 0; + + pfit_control |= gma_crtc->pipe << PFIT_PIPE_SHIFT; + + if (dev_priv->lvds_dither) + pfit_control |= PANEL_8TO6_DITHER_ENABLE; + + REG_WRITE(PFIT_CONTROL, pfit_control); +} + +/** + * Return the list of DDC modes if available, or the BIOS fixed mode otherwise. + */ +static int cdv_intel_lvds_get_modes(struct drm_connector *connector) +{ + struct drm_device *dev = connector->dev; + struct drm_psb_private *dev_priv = dev->dev_private; + struct gma_encoder *gma_encoder = gma_attached_encoder(connector); + struct psb_intel_mode_device *mode_dev = &dev_priv->mode_dev; + int ret; + + ret = psb_intel_ddc_get_modes(connector, &gma_encoder->i2c_bus->adapter); + + if (ret) + return ret; + + if (mode_dev->panel_fixed_mode != NULL) { + struct drm_display_mode *mode = + drm_mode_duplicate(dev, mode_dev->panel_fixed_mode); + drm_mode_probed_add(connector, mode); + return 1; + } + + return 0; +} + +/** + * cdv_intel_lvds_destroy - unregister and free LVDS structures + * @connector: connector to free + * + * Unregister the DDC bus for this connector then free the driver private + * structure. + */ +static void cdv_intel_lvds_destroy(struct drm_connector *connector) +{ + struct gma_encoder *gma_encoder = gma_attached_encoder(connector); + + psb_intel_i2c_destroy(gma_encoder->i2c_bus); + drm_connector_unregister(connector); + drm_connector_cleanup(connector); + kfree(connector); +} + +static int cdv_intel_lvds_set_property(struct drm_connector *connector, + struct drm_property *property, + uint64_t value) +{ + struct drm_encoder *encoder = connector->encoder; + + if (!strcmp(property->name, "scaling mode") && encoder) { + struct gma_crtc *crtc = to_gma_crtc(encoder->crtc); + uint64_t curValue; + + if (!crtc) + return -1; + + switch (value) { + case DRM_MODE_SCALE_FULLSCREEN: + break; + case DRM_MODE_SCALE_NO_SCALE: + break; + case DRM_MODE_SCALE_ASPECT: + break; + default: + return -1; + } + + if (drm_object_property_get_value(&connector->base, + property, + &curValue)) + return -1; + + if (curValue == value) + return 0; + + if (drm_object_property_set_value(&connector->base, + property, + value)) + return -1; + + if (crtc->saved_mode.hdisplay != 0 && + crtc->saved_mode.vdisplay != 0) { + if (!drm_crtc_helper_set_mode(encoder->crtc, + &crtc->saved_mode, + encoder->crtc->x, + encoder->crtc->y, + encoder->crtc->primary->fb)) + return -1; + } + } else if (!strcmp(property->name, "backlight") && encoder) { + if (drm_object_property_set_value(&connector->base, + property, + value)) + return -1; + else + gma_backlight_set(encoder->dev, value); + } else if (!strcmp(property->name, "DPMS") && encoder) { + const struct drm_encoder_helper_funcs *helpers = + encoder->helper_private; + helpers->dpms(encoder, value); + } + return 0; +} + +static const struct drm_encoder_helper_funcs + cdv_intel_lvds_helper_funcs = { + .dpms = cdv_intel_lvds_encoder_dpms, + .mode_fixup = cdv_intel_lvds_mode_fixup, + .prepare = cdv_intel_lvds_prepare, + .mode_set = cdv_intel_lvds_mode_set, + .commit = cdv_intel_lvds_commit, +}; + +static const struct drm_connector_helper_funcs + cdv_intel_lvds_connector_helper_funcs = { + .get_modes = cdv_intel_lvds_get_modes, + .mode_valid = cdv_intel_lvds_mode_valid, + .best_encoder = gma_best_encoder, +}; + +static const struct drm_connector_funcs cdv_intel_lvds_connector_funcs = { + .dpms = drm_helper_connector_dpms, + .fill_modes = drm_helper_probe_single_connector_modes, + .set_property = cdv_intel_lvds_set_property, + .destroy = cdv_intel_lvds_destroy, +}; + +/* + * Enumerate the child dev array parsed from VBT to check whether + * the LVDS is present. + * If it is present, return 1. + * If it is not present, return false. + * If no child dev is parsed from VBT, it assumes that the LVDS is present. + */ +static bool lvds_is_present_in_vbt(struct drm_device *dev, + u8 *i2c_pin) +{ + struct drm_psb_private *dev_priv = dev->dev_private; + int i; + + if (!dev_priv->child_dev_num) + return true; + + for (i = 0; i < dev_priv->child_dev_num; i++) { + struct child_device_config *child = dev_priv->child_dev + i; + + /* If the device type is not LFP, continue. + * We have to check both the new identifiers as well as the + * old for compatibility with some BIOSes. + */ + if (child->device_type != DEVICE_TYPE_INT_LFP && + child->device_type != DEVICE_TYPE_LFP) + continue; + + if (child->i2c_pin) + *i2c_pin = child->i2c_pin; + + /* However, we cannot trust the BIOS writers to populate + * the VBT correctly. Since LVDS requires additional + * information from AIM blocks, a non-zero addin offset is + * a good indicator that the LVDS is actually present. + */ + if (child->addin_offset) + return true; + + /* But even then some BIOS writers perform some black magic + * and instantiate the device without reference to any + * additional data. Trust that if the VBT was written into + * the OpRegion then they have validated the LVDS's existence. + */ + if (dev_priv->opregion.vbt) + return true; + } + + return false; +} + +/** + * cdv_intel_lvds_init - setup LVDS connectors on this device + * @dev: drm device + * + * Create the connector, register the LVDS DDC bus, and try to figure out what + * modes we can display on the LVDS panel (if present). + */ +void cdv_intel_lvds_init(struct drm_device *dev, + struct psb_intel_mode_device *mode_dev) +{ + struct gma_encoder *gma_encoder; + struct gma_connector *gma_connector; + struct cdv_intel_lvds_priv *lvds_priv; + struct drm_connector *connector; + struct drm_encoder *encoder; + struct drm_display_mode *scan; + struct drm_crtc *crtc; + struct drm_psb_private *dev_priv = dev->dev_private; + u32 lvds; + int pipe; + u8 pin; + + if (!dev_priv->lvds_enabled_in_vbt) + return; + + pin = GMBUS_PORT_PANEL; + if (!lvds_is_present_in_vbt(dev, &pin)) { + DRM_DEBUG_KMS("LVDS is not present in VBT\n"); + return; + } + + gma_encoder = kzalloc(sizeof(struct gma_encoder), + GFP_KERNEL); + if (!gma_encoder) + return; + + gma_connector = kzalloc(sizeof(struct gma_connector), + GFP_KERNEL); + if (!gma_connector) + goto failed_connector; + + lvds_priv = kzalloc(sizeof(struct cdv_intel_lvds_priv), GFP_KERNEL); + if (!lvds_priv) + goto failed_lvds_priv; + + gma_encoder->dev_priv = lvds_priv; + + connector = &gma_connector->base; + gma_connector->save = cdv_intel_lvds_save; + gma_connector->restore = cdv_intel_lvds_restore; + encoder = &gma_encoder->base; + + + drm_connector_init(dev, connector, + &cdv_intel_lvds_connector_funcs, + DRM_MODE_CONNECTOR_LVDS); + + drm_simple_encoder_init(dev, encoder, DRM_MODE_ENCODER_LVDS); + + gma_connector_attach_encoder(gma_connector, gma_encoder); + gma_encoder->type = INTEL_OUTPUT_LVDS; + + drm_encoder_helper_add(encoder, &cdv_intel_lvds_helper_funcs); + drm_connector_helper_add(connector, + &cdv_intel_lvds_connector_helper_funcs); + connector->display_info.subpixel_order = SubPixelHorizontalRGB; + connector->interlace_allowed = false; + connector->doublescan_allowed = false; + + /*Attach connector properties*/ + drm_object_attach_property(&connector->base, + dev->mode_config.scaling_mode_property, + DRM_MODE_SCALE_FULLSCREEN); + drm_object_attach_property(&connector->base, + dev_priv->backlight_property, + BRIGHTNESS_MAX_LEVEL); + + /** + * Set up I2C bus + * FIXME: distroy i2c_bus when exit + */ + gma_encoder->i2c_bus = psb_intel_i2c_create(dev, + GPIOB, + "LVDSBLC_B"); + if (!gma_encoder->i2c_bus) { + dev_printk(KERN_ERR, + &dev->pdev->dev, "I2C bus registration failed.\n"); + goto failed_blc_i2c; + } + gma_encoder->i2c_bus->slave_addr = 0x2C; + dev_priv->lvds_i2c_bus = gma_encoder->i2c_bus; + + /* + * LVDS discovery: + * 1) check for EDID on DDC + * 2) check for VBT data + * 3) check to see if LVDS is already on + * if none of the above, no panel + * 4) make sure lid is open + * if closed, act like it's not there for now + */ + + /* Set up the DDC bus. */ + gma_encoder->ddc_bus = psb_intel_i2c_create(dev, + GPIOC, + "LVDSDDC_C"); + if (!gma_encoder->ddc_bus) { + dev_printk(KERN_ERR, &dev->pdev->dev, + "DDC bus registration " "failed.\n"); + goto failed_ddc; + } + + /* + * Attempt to get the fixed panel mode from DDC. Assume that the + * preferred mode is the right one. + */ + mutex_lock(&dev->mode_config.mutex); + psb_intel_ddc_get_modes(connector, + &gma_encoder->ddc_bus->adapter); + list_for_each_entry(scan, &connector->probed_modes, head) { + if (scan->type & DRM_MODE_TYPE_PREFERRED) { + mode_dev->panel_fixed_mode = + drm_mode_duplicate(dev, scan); + goto out; /* FIXME: check for quirks */ + } + } + + /* Failed to get EDID, what about VBT? do we need this?*/ + if (dev_priv->lfp_lvds_vbt_mode) { + mode_dev->panel_fixed_mode = + drm_mode_duplicate(dev, dev_priv->lfp_lvds_vbt_mode); + if (mode_dev->panel_fixed_mode) { + mode_dev->panel_fixed_mode->type |= + DRM_MODE_TYPE_PREFERRED; + goto out; /* FIXME: check for quirks */ + } + } + /* + * If we didn't get EDID, try checking if the panel is already turned + * on. If so, assume that whatever is currently programmed is the + * correct mode. + */ + lvds = REG_READ(LVDS); + pipe = (lvds & LVDS_PIPEB_SELECT) ? 1 : 0; + crtc = psb_intel_get_crtc_from_pipe(dev, pipe); + + if (crtc && (lvds & LVDS_PORT_EN)) { + mode_dev->panel_fixed_mode = + cdv_intel_crtc_mode_get(dev, crtc); + if (mode_dev->panel_fixed_mode) { + mode_dev->panel_fixed_mode->type |= + DRM_MODE_TYPE_PREFERRED; + goto out; /* FIXME: check for quirks */ + } + } + + /* If we still don't have a mode after all that, give up. */ + if (!mode_dev->panel_fixed_mode) { + DRM_DEBUG + ("Found no modes on the lvds, ignoring the LVDS\n"); + goto failed_find; + } + + /* setup PWM */ + { + u32 pwm; + + pwm = REG_READ(BLC_PWM_CTL2); + if (pipe == 1) + pwm |= PWM_PIPE_B; + else + pwm &= ~PWM_PIPE_B; + pwm |= PWM_ENABLE; + REG_WRITE(BLC_PWM_CTL2, pwm); + } + +out: + mutex_unlock(&dev->mode_config.mutex); + drm_connector_register(connector); + return; + +failed_find: + mutex_unlock(&dev->mode_config.mutex); + pr_err("Failed find\n"); + psb_intel_i2c_destroy(gma_encoder->ddc_bus); +failed_ddc: + pr_err("Failed DDC\n"); + psb_intel_i2c_destroy(gma_encoder->i2c_bus); +failed_blc_i2c: + pr_err("Failed BLC\n"); + drm_encoder_cleanup(encoder); + drm_connector_cleanup(connector); + kfree(lvds_priv); +failed_lvds_priv: + kfree(gma_connector); +failed_connector: + kfree(gma_encoder); +} |