intel_dvo.c

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/*
 * Copyright 2006 Dave Airlie <[email protected]>
 * 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 <[email protected]>
 */
#include <linux/i2c.h>
#include <linux/slab.h>
#include <drm/drmP.h>
#include <drm/drm_crtc.h>
#include "intel_drv.h"
#include <drm/i915_drm.h>
#include "i915_drv.h"
#include "dvo.h"

#define SIL164_ADDR 0x38
#define CH7xxx_ADDR 0x76
#define TFP410_ADDR 0x38
#define NS2501_ADDR     0x38

static const struct intel_dvo_device intel_dvo_devices[] = {
    {
        .type = INTEL_DVO_CHIP_TMDS,
        .name = "sil164",
        .dvo_reg = DVOC,
        .slave_addr = SIL164_ADDR,
        .dev_ops = &sil164_ops,
    },
    {
        .type = INTEL_DVO_CHIP_TMDS,
        .name = "ch7xxx",
        .dvo_reg = DVOC,
        .slave_addr = CH7xxx_ADDR,
        .dev_ops = &ch7xxx_ops,
    },
    {
        .type = INTEL_DVO_CHIP_LVDS,
        .name = "ivch",
        .dvo_reg = DVOA,
        .slave_addr = 0x02, /* Might also be 0x44, 0x84, 0xc4 */
        .dev_ops = &ivch_ops,
    },
    {
        .type = INTEL_DVO_CHIP_TMDS,
        .name = "tfp410",
        .dvo_reg = DVOC,
        .slave_addr = TFP410_ADDR,
        .dev_ops = &tfp410_ops,
    },
    {
        .type = INTEL_DVO_CHIP_LVDS,
        .name = "ch7017",
        .dvo_reg = DVOC,
        .slave_addr = 0x75,
        .gpio = GMBUS_PORT_DPB,
        .dev_ops = &ch7017_ops,
    },
    {
            .type = INTEL_DVO_CHIP_TMDS,
        .name = "ns2501",
        .dvo_reg = DVOC,
        .slave_addr = NS2501_ADDR,
        .dev_ops = &ns2501_ops,
       }
};

struct intel_dvo {
    struct intel_encoder base;

    struct intel_dvo_device dev;

    struct drm_display_mode *panel_fixed_mode;
    bool panel_wants_dither;
};

static struct intel_dvo *enc_to_intel_dvo(struct drm_encoder *encoder)
{
    return container_of(encoder, struct intel_dvo, base.base);
}

static struct intel_dvo *intel_attached_dvo(struct drm_connector *connector)
{
    return container_of(intel_attached_encoder(connector),
                struct intel_dvo, base);
}

static bool intel_dvo_connector_get_hw_state(struct intel_connector *connector)
{
    struct intel_dvo *intel_dvo = intel_attached_dvo(&connector->base);

    return intel_dvo->dev.dev_ops->get_hw_state(&intel_dvo->dev);
}

static bool intel_dvo_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_dvo *intel_dvo = enc_to_intel_dvo(&encoder->base);
    u32 tmp;

    tmp = I915_READ(intel_dvo->dev.dvo_reg);

    if (!(tmp & DVO_ENABLE))
        return false;

    *pipe = PORT_TO_PIPE(tmp);

    return true;
}

static void intel_disable_dvo(struct intel_encoder *encoder)
{
    struct drm_i915_private *dev_priv = encoder->base.dev->dev_private;
    struct intel_dvo *intel_dvo = enc_to_intel_dvo(&encoder->base);
    u32 dvo_reg = intel_dvo->dev.dvo_reg;
    u32 temp = I915_READ(dvo_reg);

    intel_dvo->dev.dev_ops->dpms(&intel_dvo->dev, false);
    I915_WRITE(dvo_reg, temp & ~DVO_ENABLE);
    I915_READ(dvo_reg);
}

static void intel_enable_dvo(struct intel_encoder *encoder)
{
    struct drm_i915_private *dev_priv = encoder->base.dev->dev_private;
    struct intel_dvo *intel_dvo = enc_to_intel_dvo(&encoder->base);
    u32 dvo_reg = intel_dvo->dev.dvo_reg;
    u32 temp = I915_READ(dvo_reg);

    I915_WRITE(dvo_reg, temp | DVO_ENABLE);
    I915_READ(dvo_reg);
    intel_dvo->dev.dev_ops->dpms(&intel_dvo->dev, true);
}

static void intel_dvo_dpms(struct drm_connector *connector, int mode)
{
    struct intel_dvo *intel_dvo = intel_attached_dvo(connector);
    struct drm_crtc *crtc;

    /* dvo supports only 2 dpms states. */
    if (mode != DRM_MODE_DPMS_ON)
        mode = DRM_MODE_DPMS_OFF;

    if (mode == connector->dpms)
        return;

    connector->dpms = mode;

    /* Only need to change hw state when actually enabled */
    crtc = intel_dvo->base.base.crtc;
    if (!crtc) {
        intel_dvo->base.connectors_active = false;
        return;
    }

    if (mode == DRM_MODE_DPMS_ON) {
        intel_dvo->base.connectors_active = true;

        intel_crtc_update_dpms(crtc);

        intel_dvo->dev.dev_ops->dpms(&intel_dvo->dev, true);
    } else {
        intel_dvo->dev.dev_ops->dpms(&intel_dvo->dev, false);

        intel_dvo->base.connectors_active = false;

        intel_crtc_update_dpms(crtc);
    }

    intel_modeset_check_state(connector->dev);
}

static int intel_dvo_mode_valid(struct drm_connector *connector,
                struct drm_display_mode *mode)
{
    struct intel_dvo *intel_dvo = intel_attached_dvo(connector);

    if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
        return MODE_NO_DBLESCAN;

    /* XXX: Validate clock range */

    if (intel_dvo->panel_fixed_mode) {
        if (mode->hdisplay > intel_dvo->panel_fixed_mode->hdisplay)
            return MODE_PANEL;
        if (mode->vdisplay > intel_dvo->panel_fixed_mode->vdisplay)
            return MODE_PANEL;
    }

    return intel_dvo->dev.dev_ops->mode_valid(&intel_dvo->dev, mode);
}

static bool intel_dvo_mode_fixup(struct drm_encoder *encoder,
                 const struct drm_display_mode *mode,
                 struct drm_display_mode *adjusted_mode)
{
    struct intel_dvo *intel_dvo = enc_to_intel_dvo(encoder);

    /* 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 (intel_dvo->panel_fixed_mode != NULL) {
#define C(x) adjusted_mode->x = intel_dvo->panel_fixed_mode->x
        C(hdisplay);
        C(hsync_start);
        C(hsync_end);
        C(htotal);
        C(vdisplay);
        C(vsync_start);
        C(vsync_end);
        C(vtotal);
        C(clock);
#undef C
    }

    if (intel_dvo->dev.dev_ops->mode_fixup)
        return intel_dvo->dev.dev_ops->mode_fixup(&intel_dvo->dev, mode, adjusted_mode);

    return true;
}

static void intel_dvo_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_i915_private *dev_priv = dev->dev_private;
    struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
    struct intel_dvo *intel_dvo = enc_to_intel_dvo(encoder);
    int pipe = intel_crtc->pipe;
    u32 dvo_val;
    u32 dvo_reg = intel_dvo->dev.dvo_reg, dvo_srcdim_reg;
    int dpll_reg = DPLL(pipe);

    switch (dvo_reg) {
    case DVOA:
    default:
        dvo_srcdim_reg = DVOA_SRCDIM;
        break;
    case DVOB:
        dvo_srcdim_reg = DVOB_SRCDIM;
        break;
    case DVOC:
        dvo_srcdim_reg = DVOC_SRCDIM;
        break;
    }

    intel_dvo->dev.dev_ops->mode_set(&intel_dvo->dev, mode, adjusted_mode);

    /* Save the data order, since I don't know what it should be set to. */
    dvo_val = I915_READ(dvo_reg) &
          (DVO_PRESERVE_MASK | DVO_DATA_ORDER_GBRG);
    dvo_val |= DVO_DATA_ORDER_FP | DVO_BORDER_ENABLE |
           DVO_BLANK_ACTIVE_HIGH;

    if (pipe == 1)
        dvo_val |= DVO_PIPE_B_SELECT;
    dvo_val |= DVO_PIPE_STALL;
    if (adjusted_mode->flags & DRM_MODE_FLAG_PHSYNC)
        dvo_val |= DVO_HSYNC_ACTIVE_HIGH;
    if (adjusted_mode->flags & DRM_MODE_FLAG_PVSYNC)
        dvo_val |= DVO_VSYNC_ACTIVE_HIGH;

    I915_WRITE(dpll_reg, I915_READ(dpll_reg) | DPLL_DVO_HIGH_SPEED);

    /*I915_WRITE(DVOB_SRCDIM,
      (adjusted_mode->hdisplay << DVO_SRCDIM_HORIZONTAL_SHIFT) |
      (adjusted_mode->VDisplay << DVO_SRCDIM_VERTICAL_SHIFT));*/
    I915_WRITE(dvo_srcdim_reg,
           (adjusted_mode->hdisplay << DVO_SRCDIM_HORIZONTAL_SHIFT) |
           (adjusted_mode->vdisplay << DVO_SRCDIM_VERTICAL_SHIFT));
    /*I915_WRITE(DVOB, dvo_val);*/
    I915_WRITE(dvo_reg, dvo_val);
}

static enum drm_connector_status
intel_dvo_detect(struct drm_connector *connector, bool force)
{
    struct intel_dvo *intel_dvo = intel_attached_dvo(connector);
    return intel_dvo->dev.dev_ops->detect(&intel_dvo->dev);
}

static int intel_dvo_get_modes(struct drm_connector *connector)
{
    struct intel_dvo *intel_dvo = intel_attached_dvo(connector);
    struct drm_i915_private *dev_priv = connector->dev->dev_private;

    /* We should probably have an i2c driver get_modes function for those
     * devices which will have a fixed set of modes determined by the chip
     * (TV-out, for example), but for now with just TMDS and LVDS,
     * that's not the case.
     */
    intel_ddc_get_modes(connector,
                intel_gmbus_get_adapter(dev_priv, GMBUS_PORT_DPC));
    if (!list_empty(&connector->probed_modes))
        return 1;

    if (intel_dvo->panel_fixed_mode != NULL) {
        struct drm_display_mode *mode;
        mode = drm_mode_duplicate(connector->dev, intel_dvo->panel_fixed_mode);
        if (mode) {
            drm_mode_probed_add(connector, mode);
            return 1;
        }
    }

    return 0;
}

static void intel_dvo_destroy(struct drm_connector *connector)
{
    drm_sysfs_connector_remove(connector);
    drm_connector_cleanup(connector);
    kfree(connector);
}

static const struct drm_encoder_helper_funcs intel_dvo_helper_funcs = {
    .mode_fixup = intel_dvo_mode_fixup,
    .mode_set = intel_dvo_mode_set,
    .disable = intel_encoder_noop,
};

static const struct drm_connector_funcs intel_dvo_connector_funcs = {
    .dpms = intel_dvo_dpms,
    .detect = intel_dvo_detect,
    .destroy = intel_dvo_destroy,
    .fill_modes = drm_helper_probe_single_connector_modes,
};

static const struct drm_connector_helper_funcs intel_dvo_connector_helper_funcs = {
    .mode_valid = intel_dvo_mode_valid,
    .get_modes = intel_dvo_get_modes,
    .best_encoder = intel_best_encoder,
};

static void intel_dvo_enc_destroy(struct drm_encoder *encoder)
{
    struct intel_dvo *intel_dvo = enc_to_intel_dvo(encoder);

    if (intel_dvo->dev.dev_ops->destroy)
        intel_dvo->dev.dev_ops->destroy(&intel_dvo->dev);

    kfree(intel_dvo->panel_fixed_mode);

    intel_encoder_destroy(encoder);
}

static const struct drm_encoder_funcs intel_dvo_enc_funcs = {
    .destroy = intel_dvo_enc_destroy,
};

static struct drm_display_mode *
intel_dvo_get_current_mode(struct drm_connector *connector)
{
    struct drm_device *dev = connector->dev;
    struct drm_i915_private *dev_priv = dev->dev_private;
    struct intel_dvo *intel_dvo = intel_attached_dvo(connector);
    uint32_t dvo_val = I915_READ(intel_dvo->dev.dvo_reg);
    struct drm_display_mode *mode = NULL;

    /* If the DVO port is active, that'll be the LVDS, so we can pull out
     * its timings to get how the BIOS set up the panel.
     */
    if (dvo_val & DVO_ENABLE) {
        struct drm_crtc *crtc;
        int pipe = (dvo_val & DVO_PIPE_B_SELECT) ? 1 : 0;

        crtc = intel_get_crtc_for_pipe(dev, pipe);
        if (crtc) {
            mode = intel_crtc_mode_get(dev, crtc);
            if (mode) {
                mode->type |= DRM_MODE_TYPE_PREFERRED;
                if (dvo_val & DVO_HSYNC_ACTIVE_HIGH)
                    mode->flags |= DRM_MODE_FLAG_PHSYNC;
                if (dvo_val & DVO_VSYNC_ACTIVE_HIGH)
                    mode->flags |= DRM_MODE_FLAG_PVSYNC;
            }
        }
    }

    return mode;
}

void intel_dvo_init(struct drm_device *dev)
{
    struct drm_i915_private *dev_priv = dev->dev_private;
    struct intel_encoder *intel_encoder;
    struct intel_dvo *intel_dvo;
    struct intel_connector *intel_connector;
    int i;
    int encoder_type = DRM_MODE_ENCODER_NONE;

    intel_dvo = kzalloc(sizeof(struct intel_dvo), GFP_KERNEL);
    if (!intel_dvo)
        return;

    intel_connector = kzalloc(sizeof(struct intel_connector), GFP_KERNEL);
    if (!intel_connector) {
        kfree(intel_dvo);
        return;
    }

    intel_encoder = &intel_dvo->base;
    drm_encoder_init(dev, &intel_encoder->base,
             &intel_dvo_enc_funcs, encoder_type);

    intel_encoder->disable = intel_disable_dvo;
    intel_encoder->enable = intel_enable_dvo;
    intel_encoder->get_hw_state = intel_dvo_get_hw_state;
    intel_connector->get_hw_state = intel_dvo_connector_get_hw_state;

    /* Now, try to find a controller */
    for (i = 0; i < ARRAY_SIZE(intel_dvo_devices); i++) {
        struct drm_connector *connector = &intel_connector->base;
        const struct intel_dvo_device *dvo = &intel_dvo_devices[i];
        struct i2c_adapter *i2c;
        int gpio;

        /* Allow the I2C driver info to specify the GPIO to be used in
         * special cases, but otherwise default to what's defined
         * in the spec.
         */
        if (intel_gmbus_is_port_valid(dvo->gpio))
            gpio = dvo->gpio;
        else if (dvo->type == INTEL_DVO_CHIP_LVDS)
            gpio = GMBUS_PORT_SSC;
        else
            gpio = GMBUS_PORT_DPB;

        /* Set up the I2C bus necessary for the chip we're probing.
         * It appears that everything is on GPIOE except for panels
         * on i830 laptops, which are on GPIOB (DVOA).
         */
        i2c = intel_gmbus_get_adapter(dev_priv, gpio);

        intel_dvo->dev = *dvo;
        if (!dvo->dev_ops->init(&intel_dvo->dev, i2c))
            continue;

        intel_encoder->type = INTEL_OUTPUT_DVO;
        intel_encoder->crtc_mask = (1 << 0) | (1 << 1);
        switch (dvo->type) {
        case INTEL_DVO_CHIP_TMDS:
            intel_encoder->cloneable = true;
            drm_connector_init(dev, connector,
                       &intel_dvo_connector_funcs,
                       DRM_MODE_CONNECTOR_DVII);
            encoder_type = DRM_MODE_ENCODER_TMDS;
            break;
        case INTEL_DVO_CHIP_LVDS:
            intel_encoder->cloneable = false;
            drm_connector_init(dev, connector,
                       &intel_dvo_connector_funcs,
                       DRM_MODE_CONNECTOR_LVDS);
            encoder_type = DRM_MODE_ENCODER_LVDS;
            break;
        }

        drm_connector_helper_add(connector,
                     &intel_dvo_connector_helper_funcs);
        connector->display_info.subpixel_order = SubPixelHorizontalRGB;
        connector->interlace_allowed = false;
        connector->doublescan_allowed = false;

        drm_encoder_helper_add(&intel_encoder->base,
                       &intel_dvo_helper_funcs);

        intel_connector_attach_encoder(intel_connector, intel_encoder);
        if (dvo->type == INTEL_DVO_CHIP_LVDS) {
            /* For our LVDS chipsets, we should hopefully be able
             * to dig the fixed panel mode out of the BIOS data.
             * However, it's in a different format from the BIOS
             * data on chipsets with integrated LVDS (stored in AIM
             * headers, likely), so for now, just get the current
             * mode being output through DVO.
             */
            intel_dvo->panel_fixed_mode =
                intel_dvo_get_current_mode(connector);
            intel_dvo->panel_wants_dither = true;
        }

        drm_sysfs_connector_add(connector);
        return;
    }

    drm_encoder_cleanup(&intel_encoder->base);
    kfree(intel_dvo);
    kfree(intel_connector);
}