i915/src/dvo_ch7017.c

/*
 * Copyright (c) 2006, 2013, Oracle and/or its affiliates. All rights reserved.
 */

/*
 * Copyright (c) 2006, 2013, 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 <eric@anholt.net>
 *
 */

#include "dvo.h"

#define CH7017_TV_DISPLAY_MODE      0x00
#define CH7017_FLICKER_FILTER       0x01
#define CH7017_VIDEO_BANDWIDTH      0x02
#define CH7017_TEXT_ENHANCEMENT     0x03
#define CH7017_START_ACTIVE_VIDEO   0x04
#define CH7017_HORIZONTAL_POSITION  0x05
#define CH7017_VERTICAL_POSITION    0x06
#define CH7017_BLACK_LEVEL      0x07
#define CH7017_CONTRAST_ENHANCEMENT 0x08
#define CH7017_TV_PLL           0x09
#define CH7017_TV_PLL_M         0x0a
#define CH7017_TV_PLL_N         0x0b
#define CH7017_SUB_CARRIER_0        0x0c
#define CH7017_CIV_CONTROL      0x10
#define CH7017_CIV_0            0x11
#define CH7017_CHROMA_BOOST     0x14
#define CH7017_CLOCK_MODE       0x1c
#define CH7017_INPUT_CLOCK      0x1d
#define CH7017_GPIO_CONTROL     0x1e
#define CH7017_INPUT_DATA_FORMAT    0x1f
#define CH7017_CONNECTION_DETECT    0x20
#define CH7017_DAC_CONTROL      0x21
#define CH7017_BUFFERED_CLOCK_OUTPUT    0x22
#define CH7017_DEFEAT_VSYNC     0x47
#define CH7017_TEST_PATTERN     0x48

#define CH7017_POWER_MANAGEMENT     0x49
/** Enables the TV output path. */
#define CH7017_TV_EN            (1 << 0)
#define CH7017_DAC0_POWER_DOWN      (1 << 1)
#define CH7017_DAC1_POWER_DOWN      (1 << 2)
#define CH7017_DAC2_POWER_DOWN      (1 << 3)
#define CH7017_DAC3_POWER_DOWN      (1 << 4)
/** Powers down the TV out block, and DAC0-3 */
#define CH7017_TV_POWER_DOWN_EN     (1 << 5)

#define CH7017_VERSION_ID       0x4a

#define CH7017_DEVICE_ID        0x4b
#define CH7017_DEVICE_ID_VALUE      0x1b
#define CH7018_DEVICE_ID_VALUE      0x1a
#define CH7019_DEVICE_ID_VALUE      0x19

#define CH7017_XCLK_D2_ADJUST       0x53
#define CH7017_UP_SCALER_COEFF_0    0x55
#define CH7017_UP_SCALER_COEFF_1    0x56
#define CH7017_UP_SCALER_COEFF_2    0x57
#define CH7017_UP_SCALER_COEFF_3    0x58
#define CH7017_UP_SCALER_COEFF_4    0x59
#define CH7017_UP_SCALER_VERTICAL_INC_0 0x5a
#define CH7017_UP_SCALER_VERTICAL_INC_1 0x5b
#define CH7017_GPIO_INVERT      0x5c
#define CH7017_UP_SCALER_HORIZONTAL_INC_0   0x5d
#define CH7017_UP_SCALER_HORIZONTAL_INC_1   0x5e

#define CH7017_HORIZONTAL_ACTIVE_PIXEL_INPUT    0x5f
/**< Low bits of horizontal active pixel input */

#define CH7017_ACTIVE_INPUT_LINE_OUTPUT 0x60
/** High bits of horizontal active pixel input */
#define CH7017_LVDS_HAP_INPUT_MASK  (0x7 << 0)
/** High bits of vertical active line output */
#define CH7017_LVDS_VAL_HIGH_MASK   (0x7 << 3)

#define CH7017_VERTICAL_ACTIVE_LINE_OUTPUT  0x61
/**< Low bits of vertical active line output */

#define CH7017_HORIZONTAL_ACTIVE_PIXEL_OUTPUT   0x62
/**< Low bits of horizontal active pixel output */

#define CH7017_LVDS_POWER_DOWN      0x63
/** High bits of horizontal active pixel output */
#define CH7017_LVDS_HAP_HIGH_MASK   (0x7 << 0)
/** Enables the LVDS power down state transition */
#define CH7017_LVDS_POWER_DOWN_EN   (1 << 6)
/** Enables the LVDS upscaler */
#define CH7017_LVDS_UPSCALER_EN     (1 << 7)
#define CH7017_LVDS_POWER_DOWN_DEFAULT_RESERVED 0x08

#define CH7017_LVDS_ENCODING        0x64
#define CH7017_LVDS_DITHER_2D       (1 << 2)
#define CH7017_LVDS_DITHER_DIS      (1 << 3)
#define CH7017_LVDS_DUAL_CHANNEL_EN (1 << 4)
#define CH7017_LVDS_24_BIT      (1 << 5)

#define CH7017_LVDS_ENCODING_2      0x65

#define CH7017_LVDS_PLL_CONTROL     0x66
/** Enables the LVDS panel output path */
#define CH7017_LVDS_PANEN       (1 << 0)
/** Enables the LVDS panel backlight */
#define CH7017_LVDS_BKLEN       (1 << 3)

#define CH7017_POWER_SEQUENCING_T1  0x67
#define CH7017_POWER_SEQUENCING_T2  0x68
#define CH7017_POWER_SEQUENCING_T3  0x69
#define CH7017_POWER_SEQUENCING_T4  0x6a
#define CH7017_POWER_SEQUENCING_T5  0x6b
#define CH7017_GPIO_DRIVER_TYPE     0x6c
#define CH7017_GPIO_DATA        0x6d
#define CH7017_GPIO_DIRECTION_CONTROL   0x6e

#define CH7017_LVDS_PLL_FEEDBACK_DIV    0x71
# define CH7017_LVDS_PLL_FEED_BACK_DIVIDER_SHIFT 4
# define CH7017_LVDS_PLL_FEED_FORWARD_DIVIDER_SHIFT 0
# define CH7017_LVDS_PLL_FEEDBACK_DEFAULT_RESERVED 0x80

#define CH7017_LVDS_PLL_VCO_CONTROL 0x72
# define CH7017_LVDS_PLL_VCO_DEFAULT_RESERVED 0x80
# define CH7017_LVDS_PLL_VCO_SHIFT  4
# define CH7017_LVDS_PLL_POST_SCALE_DIV_SHIFT 0

#define CH7017_OUTPUTS_ENABLE       0x73
# define CH7017_CHARGE_PUMP_LOW     0x0
# define CH7017_CHARGE_PUMP_HIGH    0x3
# define CH7017_LVDS_CHANNEL_A      (1 << 3)
# define CH7017_LVDS_CHANNEL_B      (1 << 4)
# define CH7017_TV_DAC_A        (1 << 5)
# define CH7017_TV_DAC_B        (1 << 6)
# define CH7017_DDC_SELECT_DC2      (1 << 7)

#define CH7017_LVDS_OUTPUT_AMPLITUDE    0x74
#define CH7017_LVDS_PLL_EMI_REDUCTION   0x75
#define CH7017_LVDS_POWER_DOWN_FLICKER  0x76

#define CH7017_LVDS_CONTROL_2       0x78
# define CH7017_LOOP_FILTER_SHIFT   5
# define CH7017_PHASE_DETECTOR_SHIFT    0

#define CH7017_BANG_LIMIT_CONTROL   0x7f

struct ch7017_priv {
    uint8_t dummy;
};

static void ch7017_dump_regs(struct intel_dvo_device *dvo);
static void ch7017_dpms(struct intel_dvo_device *dvo, bool enable);

static bool ch7017_read(struct intel_dvo_device *dvo, u8 addr, u8 *val)
{
    struct i2c_msg msgs[] = {
        {
            .addr = dvo->slave_addr,
            .flags = 0,
            .len = 1,
            .buf = &addr,
        },
        {
            .addr = dvo->slave_addr,
            .flags = I2C_M_RD,
            .len = 1,
            .buf = val,
        }
    };
    return i2c_transfer(dvo->i2c_bus, msgs, 2) == 2;
}

static bool ch7017_write(struct intel_dvo_device *dvo, uint8_t addr, uint8_t val)
{
    uint8_t buf[2] = { addr, val };
    struct i2c_msg msg = {
        .addr = dvo->slave_addr,
        .flags = 0,
        .len = 2,
        .buf = buf,
    };
    return i2c_transfer(dvo->i2c_bus, &msg, 1) == 1;
}

/** Probes for a CH7017 on the given bus and slave address. */
static bool ch7017_init(struct intel_dvo_device *dvo,
            struct i2c_adapter *adapter)
{
    struct ch7017_priv *priv;
    const char *str;
    u8 val;

    priv = kzalloc(sizeof(struct ch7017_priv), GFP_KERNEL);
    if (priv == NULL)
        return false;

    dvo->i2c_bus = adapter;
    dvo->dev_priv = priv;

    if (!ch7017_read(dvo, CH7017_DEVICE_ID, &val))
        goto fail;

    switch (val) {
    case CH7017_DEVICE_ID_VALUE:
        str = "ch7017";
        break;
    case CH7018_DEVICE_ID_VALUE:
        str = "ch7018";
        break;
    case CH7019_DEVICE_ID_VALUE:
        str = "ch7019";
        break;
    default:
        DRM_DEBUG_KMS("ch701x not detected, got %d: from %s "
                  "slave %d.\n",
                  val, adapter->name,dvo->slave_addr);
        goto fail;
    }

    DRM_DEBUG_KMS("%s detected on %s, addr %d\n",
              str, adapter->name, dvo->slave_addr);
    return true;

fail:
    kfree(priv, sizeof (struct ch7017_priv));
    return false;
}

/* LINTED */
static enum drm_connector_status ch7017_detect(struct intel_dvo_device *dvo)
{
    return connector_status_connected;
}

/* LINTED */
static int ch7017_mode_valid(struct intel_dvo_device *dvo,
                          struct drm_display_mode *mode)
{
    if (mode->clock > 160000)
        return MODE_CLOCK_HIGH;

    return MODE_OK;
}

static void ch7017_mode_set(struct intel_dvo_device *dvo,
                struct drm_display_mode *mode,
                /* LINTED */
                struct drm_display_mode *adjusted_mode)
{
    uint8_t lvds_pll_feedback_div, lvds_pll_vco_control;
    uint8_t outputs_enable, lvds_control_2, lvds_power_down;
    uint8_t horizontal_active_pixel_input;
    uint8_t horizontal_active_pixel_output, vertical_active_line_output;
    uint8_t active_input_line_output;

    DRM_DEBUG_KMS("Registers before mode setting\n");
    ch7017_dump_regs(dvo);

    /* LVDS PLL settings from page 75 of 7017-7017ds.pdf*/
    if (mode->clock < 100000) {
        outputs_enable = CH7017_LVDS_CHANNEL_A | CH7017_CHARGE_PUMP_LOW;
        lvds_pll_feedback_div = CH7017_LVDS_PLL_FEEDBACK_DEFAULT_RESERVED |
            (2 << CH7017_LVDS_PLL_FEED_BACK_DIVIDER_SHIFT) |
            (13 << CH7017_LVDS_PLL_FEED_FORWARD_DIVIDER_SHIFT);
        lvds_pll_vco_control = CH7017_LVDS_PLL_VCO_DEFAULT_RESERVED |
            (2 << CH7017_LVDS_PLL_VCO_SHIFT) |
            (3 << CH7017_LVDS_PLL_POST_SCALE_DIV_SHIFT);
        lvds_control_2 = (1 << CH7017_LOOP_FILTER_SHIFT) |
            (0 << CH7017_PHASE_DETECTOR_SHIFT);
    } else {
        outputs_enable = CH7017_LVDS_CHANNEL_A | CH7017_CHARGE_PUMP_HIGH;
        lvds_pll_feedback_div = CH7017_LVDS_PLL_FEEDBACK_DEFAULT_RESERVED |
            (2 << CH7017_LVDS_PLL_FEED_BACK_DIVIDER_SHIFT) |
            (3 << CH7017_LVDS_PLL_FEED_FORWARD_DIVIDER_SHIFT);
        lvds_pll_feedback_div = 35;
        lvds_control_2 = (3 << CH7017_LOOP_FILTER_SHIFT) |
            (0 << CH7017_PHASE_DETECTOR_SHIFT);
        /* LINTED */
        if (1) { /* XXX: dual channel panel detection.  Assume yes for now. */
            outputs_enable |= CH7017_LVDS_CHANNEL_B;
            lvds_pll_vco_control = CH7017_LVDS_PLL_VCO_DEFAULT_RESERVED |
                (2 << CH7017_LVDS_PLL_VCO_SHIFT) |
                (13 << CH7017_LVDS_PLL_POST_SCALE_DIV_SHIFT);
        } else {
            lvds_pll_vco_control = CH7017_LVDS_PLL_VCO_DEFAULT_RESERVED |
                (1 << CH7017_LVDS_PLL_VCO_SHIFT) |
                (13 << CH7017_LVDS_PLL_POST_SCALE_DIV_SHIFT);
        }
    }

    horizontal_active_pixel_input = mode->hdisplay & 0x00ff;

    vertical_active_line_output = mode->vdisplay & 0x00ff;
    horizontal_active_pixel_output = mode->hdisplay & 0x00ff;

    active_input_line_output = ((mode->hdisplay & 0x0700) >> 8) |
                   (((mode->vdisplay & 0x0700) >> 8) << 3);

    lvds_power_down = CH7017_LVDS_POWER_DOWN_DEFAULT_RESERVED |
              (mode->hdisplay & 0x0700) >> 8;

    ch7017_dpms(dvo, false);
    (void) ch7017_write(dvo, CH7017_HORIZONTAL_ACTIVE_PIXEL_INPUT,
            horizontal_active_pixel_input);
    (void) ch7017_write(dvo, CH7017_HORIZONTAL_ACTIVE_PIXEL_OUTPUT,
            horizontal_active_pixel_output);
    (void) ch7017_write(dvo, CH7017_VERTICAL_ACTIVE_LINE_OUTPUT,
            vertical_active_line_output);
    (void) ch7017_write(dvo, CH7017_ACTIVE_INPUT_LINE_OUTPUT,
            active_input_line_output);
    (void) ch7017_write(dvo, CH7017_LVDS_PLL_VCO_CONTROL, lvds_pll_vco_control);
    (void) ch7017_write(dvo, CH7017_LVDS_PLL_FEEDBACK_DIV, lvds_pll_feedback_div);
    (void) ch7017_write(dvo, CH7017_LVDS_CONTROL_2, lvds_control_2);
    (void) ch7017_write(dvo, CH7017_OUTPUTS_ENABLE, outputs_enable);

    /* Turn the LVDS back on with new settings. */
    (void) ch7017_write(dvo, CH7017_LVDS_POWER_DOWN, lvds_power_down);

    DRM_DEBUG_KMS("Registers after mode setting\n");
    ch7017_dump_regs(dvo);
}

/* set the CH7017 power state */
static void ch7017_dpms(struct intel_dvo_device *dvo, bool enable)
{
    uint8_t val;

    (void) ch7017_read(dvo, CH7017_LVDS_POWER_DOWN, &val);

    /* Turn off TV/VGA, and never turn it on since we don't support it. */
    (void) ch7017_write(dvo, CH7017_POWER_MANAGEMENT,
            CH7017_DAC0_POWER_DOWN |
            CH7017_DAC1_POWER_DOWN |
            CH7017_DAC2_POWER_DOWN |
            CH7017_DAC3_POWER_DOWN |
            CH7017_TV_POWER_DOWN_EN);

    if (enable) {
        /* Turn on the LVDS */
        (void) ch7017_write(dvo, CH7017_LVDS_POWER_DOWN,
                 val & ~CH7017_LVDS_POWER_DOWN_EN);
    } else {
        /* Turn off the LVDS */
        (void) ch7017_write(dvo, CH7017_LVDS_POWER_DOWN,
                 val | CH7017_LVDS_POWER_DOWN_EN);
    }

    /* XXX: Should actually wait for update power status somehow */
    msleep(20);
}

static bool ch7017_get_hw_state(struct intel_dvo_device *dvo)
{
    uint8_t val;

    ch7017_read(dvo, CH7017_LVDS_POWER_DOWN, &val);

    if (val & CH7017_LVDS_POWER_DOWN_EN)
        return false;
    else
        return true;
}

static void ch7017_dump_regs(struct intel_dvo_device *dvo)
{
    uint8_t val;

#define DUMP(reg)                   \
do {                            \
    (void) ch7017_read(dvo, reg, &val);         \
    DRM_DEBUG_KMS(#reg ": %02x\n", val);        \
} while (*"\0")

    DUMP(CH7017_HORIZONTAL_ACTIVE_PIXEL_INPUT);
    DUMP(CH7017_HORIZONTAL_ACTIVE_PIXEL_OUTPUT);
    DUMP(CH7017_VERTICAL_ACTIVE_LINE_OUTPUT);
    DUMP(CH7017_ACTIVE_INPUT_LINE_OUTPUT);
    DUMP(CH7017_LVDS_PLL_VCO_CONTROL);
    DUMP(CH7017_LVDS_PLL_FEEDBACK_DIV);
    DUMP(CH7017_LVDS_CONTROL_2);
    DUMP(CH7017_OUTPUTS_ENABLE);
    DUMP(CH7017_LVDS_POWER_DOWN);
}

static void ch7017_destroy(struct intel_dvo_device *dvo)
{
    struct ch7017_priv *priv = dvo->dev_priv;

    if (priv) {
        kfree(priv, sizeof(struct ch7017_priv));
        dvo->dev_priv = NULL;
    }
}

struct intel_dvo_dev_ops ch7017_ops = {
    .init = ch7017_init,
    .detect = ch7017_detect,
    .mode_valid = ch7017_mode_valid,
    .mode_set = ch7017_mode_set,
    .dpms = ch7017_dpms,
    .get_hw_state = ch7017_get_hw_state,
    .dump_regs = ch7017_dump_regs,
    .destroy = ch7017_destroy,
};