nv50_dac.c

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/*
 * Copyright (C) 2008 Maarten Maathuis.
 * All Rights Reserved.
 *
 * 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 COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS 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.
 *
 */

#include <drm/drmP.h>
#include <drm/drm_crtc_helper.h>

#define NOUVEAU_DMA_DEBUG (nouveau_reg_debug & NOUVEAU_REG_DEBUG_EVO)
#include "nouveau_reg.h"
#include "nouveau_drm.h"
#include "nouveau_dma.h"
#include "nouveau_encoder.h"
#include "nouveau_connector.h"
#include "nouveau_crtc.h"
#include "nv50_display.h"

#include <subdev/timer.h>

static void
nv50_dac_disconnect(struct drm_encoder *encoder)
{
    struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder);
    struct drm_device *dev = encoder->dev;
    struct nouveau_drm *drm = nouveau_drm(dev);
    struct nouveau_channel *evo = nv50_display(dev)->master;
    int ret;

    if (!nv_encoder->crtc)
        return;
    nv50_crtc_blank(nouveau_crtc(nv_encoder->crtc), true);

    NV_DEBUG(drm, "Disconnecting DAC %d\n", nv_encoder->or);

    ret = RING_SPACE(evo, 4);
    if (ret) {
        NV_ERROR(drm, "no space while disconnecting DAC\n");
        return;
    }
    BEGIN_NV04(evo, 0, NV50_EVO_DAC(nv_encoder->or, MODE_CTRL), 1);
    OUT_RING  (evo, 0);
    BEGIN_NV04(evo, 0, NV50_EVO_UPDATE, 1);
    OUT_RING  (evo, 0);

    nv_encoder->crtc = NULL;
}

static enum drm_connector_status
nv50_dac_detect(struct drm_encoder *encoder, struct drm_connector *connector)
{
    struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder);
    struct nouveau_device *device = nouveau_dev(encoder->dev);
    struct nouveau_drm *drm = nouveau_drm(encoder->dev);
    enum drm_connector_status status = connector_status_disconnected;
    uint32_t dpms_state, load_pattern, load_state;
    int or = nv_encoder->or;

    nv_wr32(device, NV50_PDISPLAY_DAC_CLK_CTRL1(or), 0x00000001);
    dpms_state = nv_rd32(device, NV50_PDISPLAY_DAC_DPMS_CTRL(or));

    nv_wr32(device, NV50_PDISPLAY_DAC_DPMS_CTRL(or),
        0x00150000 | NV50_PDISPLAY_DAC_DPMS_CTRL_PENDING);
    if (!nv_wait(device, NV50_PDISPLAY_DAC_DPMS_CTRL(or),
             NV50_PDISPLAY_DAC_DPMS_CTRL_PENDING, 0)) {
        NV_ERROR(drm, "timeout: DAC_DPMS_CTRL_PENDING(%d) == 0\n", or);
        NV_ERROR(drm, "DAC_DPMS_CTRL(%d) = 0x%08x\n", or,
              nv_rd32(device, NV50_PDISPLAY_DAC_DPMS_CTRL(or)));
        return status;
    }

    /* Use bios provided value if possible. */
    if (drm->vbios.dactestval) {
        load_pattern = drm->vbios.dactestval;
        NV_DEBUG(drm, "Using bios provided load_pattern of %d\n",
              load_pattern);
    } else {
        load_pattern = 340;
        NV_DEBUG(drm, "Using default load_pattern of %d\n",
             load_pattern);
    }

    nv_wr32(device, NV50_PDISPLAY_DAC_LOAD_CTRL(or),
        NV50_PDISPLAY_DAC_LOAD_CTRL_ACTIVE | load_pattern);
    mdelay(45); /* give it some time to process */
    load_state = nv_rd32(device, NV50_PDISPLAY_DAC_LOAD_CTRL(or));

    nv_wr32(device, NV50_PDISPLAY_DAC_LOAD_CTRL(or), 0);
    nv_wr32(device, NV50_PDISPLAY_DAC_DPMS_CTRL(or), dpms_state |
        NV50_PDISPLAY_DAC_DPMS_CTRL_PENDING);

    if ((load_state & NV50_PDISPLAY_DAC_LOAD_CTRL_PRESENT) ==
              NV50_PDISPLAY_DAC_LOAD_CTRL_PRESENT)
        status = connector_status_connected;

    if (status == connector_status_connected)
        NV_DEBUG(drm, "Load was detected on output with or %d\n", or);
    else
        NV_DEBUG(drm, "Load was not detected on output with or %d\n", or);

    return status;
}

static void
nv50_dac_dpms(struct drm_encoder *encoder, int mode)
{
    struct nouveau_device *device = nouveau_dev(encoder->dev);
    struct nouveau_drm *drm = nouveau_drm(encoder->dev);
    struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder);
    uint32_t val;
    int or = nv_encoder->or;

    NV_DEBUG(drm, "or %d mode %d\n", or, mode);

    /* wait for it to be done */
    if (!nv_wait(device, NV50_PDISPLAY_DAC_DPMS_CTRL(or),
             NV50_PDISPLAY_DAC_DPMS_CTRL_PENDING, 0)) {
        NV_ERROR(drm, "timeout: DAC_DPMS_CTRL_PENDING(%d) == 0\n", or);
        NV_ERROR(drm, "DAC_DPMS_CTRL(%d) = 0x%08x\n", or,
             nv_rd32(device, NV50_PDISPLAY_DAC_DPMS_CTRL(or)));
        return;
    }

    val = nv_rd32(device, NV50_PDISPLAY_DAC_DPMS_CTRL(or)) & ~0x7F;

    if (mode != DRM_MODE_DPMS_ON)
        val |= NV50_PDISPLAY_DAC_DPMS_CTRL_BLANKED;

    switch (mode) {
    case DRM_MODE_DPMS_STANDBY:
        val |= NV50_PDISPLAY_DAC_DPMS_CTRL_HSYNC_OFF;
        break;
    case DRM_MODE_DPMS_SUSPEND:
        val |= NV50_PDISPLAY_DAC_DPMS_CTRL_VSYNC_OFF;
        break;
    case DRM_MODE_DPMS_OFF:
        val |= NV50_PDISPLAY_DAC_DPMS_CTRL_OFF;
        val |= NV50_PDISPLAY_DAC_DPMS_CTRL_HSYNC_OFF;
        val |= NV50_PDISPLAY_DAC_DPMS_CTRL_VSYNC_OFF;
        break;
    default:
        break;
    }

    nv_wr32(device, NV50_PDISPLAY_DAC_DPMS_CTRL(or), val |
        NV50_PDISPLAY_DAC_DPMS_CTRL_PENDING);
}

static void
nv50_dac_save(struct drm_encoder *encoder)
{
    struct nouveau_drm *drm = nouveau_drm(encoder->dev);
    NV_ERROR(drm, "!!\n");
}

static void
nv50_dac_restore(struct drm_encoder *encoder)
{
    struct nouveau_drm *drm = nouveau_drm(encoder->dev);
    NV_ERROR(drm, "!!\n");
}

static bool
nv50_dac_mode_fixup(struct drm_encoder *encoder,
            const struct drm_display_mode *mode,
            struct drm_display_mode *adjusted_mode)
{
    struct nouveau_drm *drm = nouveau_drm(encoder->dev);
    struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder);
    struct nouveau_connector *connector;

    NV_DEBUG(drm, "or %d\n", nv_encoder->or);

    connector = nouveau_encoder_connector_get(nv_encoder);
    if (!connector) {
        NV_ERROR(drm, "Encoder has no connector\n");
        return false;
    }

    if (connector->scaling_mode != DRM_MODE_SCALE_NONE &&
         connector->native_mode)
        drm_mode_copy(adjusted_mode, connector->native_mode);

    return true;
}

static void
nv50_dac_commit(struct drm_encoder *encoder)
{
}

static void
nv50_dac_mode_set(struct drm_encoder *encoder, struct drm_display_mode *mode,
          struct drm_display_mode *adjusted_mode)
{
    struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder);
    struct nouveau_drm *drm = nouveau_drm(encoder->dev);
    struct drm_device *dev = encoder->dev;
    struct nouveau_channel *evo = nv50_display(dev)->master;
    struct nouveau_crtc *crtc = nouveau_crtc(encoder->crtc);
    uint32_t mode_ctl = 0, mode_ctl2 = 0;
    int ret;

    NV_DEBUG(drm, "or %d type %d crtc %d\n",
             nv_encoder->or, nv_encoder->dcb->type, crtc->index);

    nv50_dac_dpms(encoder, DRM_MODE_DPMS_ON);

    if (crtc->index == 1)
        mode_ctl |= NV50_EVO_DAC_MODE_CTRL_CRTC1;
    else
        mode_ctl |= NV50_EVO_DAC_MODE_CTRL_CRTC0;

    /* Lacking a working tv-out, this is not a 100% sure. */
    if (nv_encoder->dcb->type == DCB_OUTPUT_ANALOG)
        mode_ctl |= 0x40;
    else
    if (nv_encoder->dcb->type == DCB_OUTPUT_TV)
        mode_ctl |= 0x100;

    if (adjusted_mode->flags & DRM_MODE_FLAG_NHSYNC)
        mode_ctl2 |= NV50_EVO_DAC_MODE_CTRL2_NHSYNC;

    if (adjusted_mode->flags & DRM_MODE_FLAG_NVSYNC)
        mode_ctl2 |= NV50_EVO_DAC_MODE_CTRL2_NVSYNC;

    ret = RING_SPACE(evo, 3);
    if (ret) {
        NV_ERROR(drm, "no space while connecting DAC\n");
        return;
    }
    BEGIN_NV04(evo, 0, NV50_EVO_DAC(nv_encoder->or, MODE_CTRL), 2);
    OUT_RING(evo, mode_ctl);
    OUT_RING(evo, mode_ctl2);

    nv_encoder->crtc = encoder->crtc;
}

static struct drm_crtc *
nv50_dac_crtc_get(struct drm_encoder *encoder)
{
    return nouveau_encoder(encoder)->crtc;
}

static const struct drm_encoder_helper_funcs nv50_dac_helper_funcs = {
    .dpms = nv50_dac_dpms,
    .save = nv50_dac_save,
    .restore = nv50_dac_restore,
    .mode_fixup = nv50_dac_mode_fixup,
    .prepare = nv50_dac_disconnect,
    .commit = nv50_dac_commit,
    .mode_set = nv50_dac_mode_set,
    .get_crtc = nv50_dac_crtc_get,
    .detect = nv50_dac_detect,
    .disable = nv50_dac_disconnect
};

static void
nv50_dac_destroy(struct drm_encoder *encoder)
{
    struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder);
    struct nouveau_drm *drm = nouveau_drm(encoder->dev);

    if (!encoder)
        return;

    NV_DEBUG(drm, "\n");

    drm_encoder_cleanup(encoder);
    kfree(nv_encoder);
}

static const struct drm_encoder_funcs nv50_dac_encoder_funcs = {
    .destroy = nv50_dac_destroy,
};

int
nv50_dac_create(struct drm_connector *connector, struct dcb_output *entry)
{
    struct nouveau_encoder *nv_encoder;
    struct drm_encoder *encoder;

    nv_encoder = kzalloc(sizeof(*nv_encoder), GFP_KERNEL);
    if (!nv_encoder)
        return -ENOMEM;
    encoder = to_drm_encoder(nv_encoder);

    nv_encoder->dcb = entry;
    nv_encoder->or = ffs(entry->or) - 1;

    drm_encoder_init(connector->dev, encoder, &nv50_dac_encoder_funcs,
             DRM_MODE_ENCODER_DAC);
    drm_encoder_helper_add(encoder, &nv50_dac_helper_funcs);

    encoder->possible_crtcs = entry->heads;
    encoder->possible_clones = 0;

    drm_mode_connector_attach_encoder(connector, encoder);
    return 0;
}