cdv_intel_crt.c

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/*
 * 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 <drm/drmP.h>

#include "intel_bios.h"
#include "psb_drv.h"
#include "psb_intel_drv.h"
#include "psb_intel_reg.h"
#include "power.h"
#include "cdv_device.h"
#include <linux/pm_runtime.h>


static void cdv_intel_crt_dpms(struct drm_encoder *encoder, int mode)
{
    struct drm_device *dev = encoder->dev;
    u32 temp, reg;
    reg = ADPA;

    temp = REG_READ(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;
    }

    REG_WRITE(reg, temp);
}

static int cdv_intel_crt_mode_valid(struct drm_connector *connector,
                struct drm_display_mode *mode)
{
    if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
        return MODE_NO_DBLESCAN;

    /* The lowest clock for CDV is 20000KHz */
    if (mode->clock < 20000)
        return MODE_CLOCK_LOW;

    /* The max clock for CDV is 355 instead of 400 */
    if (mode->clock > 355000)
        return MODE_CLOCK_HIGH;

    return MODE_OK;
}

static bool cdv_intel_crt_mode_fixup(struct drm_encoder *encoder,
                 const struct drm_display_mode *mode,
                 struct drm_display_mode *adjusted_mode)
{
    return true;
}

static void cdv_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 psb_intel_crtc *psb_intel_crtc =
                    to_psb_intel_crtc(crtc);
    int dpll_md_reg;
    u32 adpa, dpll_md;
    u32 adpa_reg;

    if (psb_intel_crtc->pipe == 0)
        dpll_md_reg = DPLL_A_MD;
    else
        dpll_md_reg = DPLL_B_MD;

    adpa_reg = ADPA;

    /*
     * Disable separate mode multiplier used when cloning SDVO to CRT
     * XXX this needs to be adjusted when we really are cloning
     */
    {
        dpll_md = REG_READ(dpll_md_reg);
        REG_WRITE(dpll_md_reg,
               dpll_md & ~DPLL_MD_UDI_MULTIPLIER_MASK);
    }

    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;

    if (psb_intel_crtc->pipe == 0)
        adpa |= ADPA_PIPE_A_SELECT;
    else
        adpa |= ADPA_PIPE_B_SELECT;

    REG_WRITE(adpa_reg, adpa);
}


static bool cdv_intel_crt_detect_hotplug(struct drm_connector *connector,
                                bool force)
{
    struct drm_device *dev = connector->dev;
    u32 hotplug_en;
    int i, tries = 0, ret = false;
    u32 orig;

    /*
     * On a CDV thep, CRT detect sequence need to be done twice
     * to get a reliable result.
     */
    tries = 2;

    orig = hotplug_en = REG_READ(PORT_HOTPLUG_EN);
    hotplug_en &= ~(CRT_HOTPLUG_DETECT_MASK);
    hotplug_en |= CRT_HOTPLUG_FORCE_DETECT;

    hotplug_en |= CRT_HOTPLUG_ACTIVATION_PERIOD_64;
    hotplug_en |= CRT_HOTPLUG_VOLTAGE_COMPARE_50;

    for (i = 0; i < tries ; i++) {
        unsigned long timeout;
        /* turn on the FORCE_DETECT */
        REG_WRITE(PORT_HOTPLUG_EN, hotplug_en);
        timeout = jiffies + msecs_to_jiffies(1000);
        /* wait for FORCE_DETECT to go off */
        do {
            if (!(REG_READ(PORT_HOTPLUG_EN) &
                    CRT_HOTPLUG_FORCE_DETECT))
                break;
            msleep(1);
        } while (time_after(timeout, jiffies));
    }

    if ((REG_READ(PORT_HOTPLUG_STAT) & CRT_HOTPLUG_MONITOR_MASK) !=
        CRT_HOTPLUG_MONITOR_NONE)
        ret = true;

     /* clear the interrupt we just generated, if any */
    REG_WRITE(PORT_HOTPLUG_STAT, CRT_HOTPLUG_INT_STATUS);

    /* and put the bits back */
    REG_WRITE(PORT_HOTPLUG_EN, orig);
    return ret;
}

static enum drm_connector_status cdv_intel_crt_detect(
                struct drm_connector *connector, bool force)
{
    if (cdv_intel_crt_detect_hotplug(connector, force))
        return connector_status_connected;
    else
        return connector_status_disconnected;
}

static void cdv_intel_crt_destroy(struct drm_connector *connector)
{
    struct psb_intel_encoder *psb_intel_encoder =
                    psb_intel_attached_encoder(connector);

    psb_intel_i2c_destroy(psb_intel_encoder->ddc_bus);
    drm_sysfs_connector_remove(connector);
    drm_connector_cleanup(connector);
    kfree(connector);
}

static int cdv_intel_crt_get_modes(struct drm_connector *connector)
{
    struct psb_intel_encoder *psb_intel_encoder =
                psb_intel_attached_encoder(connector);
    return psb_intel_ddc_get_modes(connector, &psb_intel_encoder->ddc_bus->adapter);
}

static int cdv_intel_crt_set_property(struct drm_connector *connector,
                  struct drm_property *property,
                  uint64_t value)
{
    return 0;
}

/*
 * Routines for controlling stuff on the analog port
 */

static const struct drm_encoder_helper_funcs cdv_intel_crt_helper_funcs = {
    .dpms = cdv_intel_crt_dpms,
    .mode_fixup = cdv_intel_crt_mode_fixup,
    .prepare = psb_intel_encoder_prepare,
    .commit = psb_intel_encoder_commit,
    .mode_set = cdv_intel_crt_mode_set,
};

static const struct drm_connector_funcs cdv_intel_crt_connector_funcs = {
    .dpms = drm_helper_connector_dpms,
    .detect = cdv_intel_crt_detect,
    .fill_modes = drm_helper_probe_single_connector_modes,
    .destroy = cdv_intel_crt_destroy,
    .set_property = cdv_intel_crt_set_property,
};

static const struct drm_connector_helper_funcs
                cdv_intel_crt_connector_helper_funcs = {
    .mode_valid = cdv_intel_crt_mode_valid,
    .get_modes = cdv_intel_crt_get_modes,
    .best_encoder = psb_intel_best_encoder,
};

static void cdv_intel_crt_enc_destroy(struct drm_encoder *encoder)
{
    drm_encoder_cleanup(encoder);
}

static const struct drm_encoder_funcs cdv_intel_crt_enc_funcs = {
    .destroy = cdv_intel_crt_enc_destroy,
};

void cdv_intel_crt_init(struct drm_device *dev,
            struct psb_intel_mode_device *mode_dev)
{

    struct psb_intel_connector *psb_intel_connector;
    struct psb_intel_encoder *psb_intel_encoder;
    struct drm_connector *connector;
    struct drm_encoder *encoder;

    u32 i2c_reg;

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

    psb_intel_connector = kzalloc(sizeof(struct psb_intel_connector), GFP_KERNEL);
    if (!psb_intel_connector)
        goto failed_connector;

    connector = &psb_intel_connector->base;
    drm_connector_init(dev, connector,
        &cdv_intel_crt_connector_funcs, DRM_MODE_CONNECTOR_VGA);

    encoder = &psb_intel_encoder->base;
    drm_encoder_init(dev, encoder,
        &cdv_intel_crt_enc_funcs, DRM_MODE_ENCODER_DAC);

    psb_intel_connector_attach_encoder(psb_intel_connector,
                       psb_intel_encoder);

    /* Set up the DDC bus. */
    i2c_reg = GPIOA;
    /* Remove the following code for CDV */
    /*
    if (dev_priv->crt_ddc_bus != 0)
        i2c_reg = dev_priv->crt_ddc_bus;
    }*/
    psb_intel_encoder->ddc_bus = psb_intel_i2c_create(dev,
                              i2c_reg, "CRTDDC_A");
    if (!psb_intel_encoder->ddc_bus) {
        dev_printk(KERN_ERR, &dev->pdev->dev, "DDC bus registration "
               "failed.\n");
        goto failed_ddc;
    }

    psb_intel_encoder->type = INTEL_OUTPUT_ANALOG;
    /*
    psb_intel_output->clone_mask = (1 << INTEL_ANALOG_CLONE_BIT);
    psb_intel_output->crtc_mask = (1 << 0) | (1 << 1);
    */
    connector->interlace_allowed = 0;
    connector->doublescan_allowed = 0;

    drm_encoder_helper_add(encoder, &cdv_intel_crt_helper_funcs);
    drm_connector_helper_add(connector,
                    &cdv_intel_crt_connector_helper_funcs);

    drm_sysfs_connector_add(connector);

    return;
failed_ddc:
    drm_encoder_cleanup(&psb_intel_encoder->base);
    drm_connector_cleanup(&psb_intel_connector->base);
    kfree(psb_intel_connector);
failed_connector:
    kfree(psb_intel_encoder);
    return;
}