omap_connector.c

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/*
 * drivers/staging/omapdrm/omap_connector.c
 *
 * Copyright (C) 2011 Texas Instruments
 * Author: Rob Clark <[email protected]>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published by
 * the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "omap_drv.h"

#include "drm_crtc.h"
#include "drm_crtc_helper.h"

/*
 * connector funcs
 */

#define to_omap_connector(x) container_of(x, struct omap_connector, base)

struct omap_connector {
    struct drm_connector base;
    struct omap_dss_device *dssdev;
};

static inline void copy_timings_omap_to_drm(struct drm_display_mode *mode,
        struct omap_video_timings *timings)
{
    mode->clock = timings->pixel_clock;

    mode->hdisplay = timings->x_res;
    mode->hsync_start = mode->hdisplay + timings->hfp;
    mode->hsync_end = mode->hsync_start + timings->hsw;
    mode->htotal = mode->hsync_end + timings->hbp;

    mode->vdisplay = timings->y_res;
    mode->vsync_start = mode->vdisplay + timings->vfp;
    mode->vsync_end = mode->vsync_start + timings->vsw;
    mode->vtotal = mode->vsync_end + timings->vbp;

    mode->flags = 0;

    if (timings->interlace)
        mode->flags |= DRM_MODE_FLAG_INTERLACE;

    if (timings->hsync_level == OMAPDSS_SIG_ACTIVE_HIGH)
        mode->flags |= DRM_MODE_FLAG_PHSYNC;
    else
        mode->flags |= DRM_MODE_FLAG_NHSYNC;

    if (timings->vsync_level == OMAPDSS_SIG_ACTIVE_HIGH)
        mode->flags |= DRM_MODE_FLAG_PVSYNC;
    else
        mode->flags |= DRM_MODE_FLAG_NVSYNC;
}

static inline void copy_timings_drm_to_omap(struct omap_video_timings *timings,
        struct drm_display_mode *mode)
{
    timings->pixel_clock = mode->clock;

    timings->x_res = mode->hdisplay;
    timings->hfp = mode->hsync_start - mode->hdisplay;
    timings->hsw = mode->hsync_end - mode->hsync_start;
    timings->hbp = mode->htotal - mode->hsync_end;

    timings->y_res = mode->vdisplay;
    timings->vfp = mode->vsync_start - mode->vdisplay;
    timings->vsw = mode->vsync_end - mode->vsync_start;
    timings->vbp = mode->vtotal - mode->vsync_end;

    timings->interlace = !!(mode->flags & DRM_MODE_FLAG_INTERLACE);

    if (mode->flags & DRM_MODE_FLAG_PHSYNC)
        timings->hsync_level = OMAPDSS_SIG_ACTIVE_HIGH;
    else
        timings->hsync_level = OMAPDSS_SIG_ACTIVE_LOW;

    if (mode->flags & DRM_MODE_FLAG_PVSYNC)
        timings->vsync_level = OMAPDSS_SIG_ACTIVE_HIGH;
    else
        timings->vsync_level = OMAPDSS_SIG_ACTIVE_LOW;

    timings->data_pclk_edge = OMAPDSS_DRIVE_SIG_RISING_EDGE;
    timings->de_level = OMAPDSS_SIG_ACTIVE_HIGH;
    timings->sync_pclk_edge = OMAPDSS_DRIVE_SIG_OPPOSITE_EDGES;
}

static void omap_connector_dpms(struct drm_connector *connector, int mode)
{
    struct omap_connector *omap_connector = to_omap_connector(connector);
    struct omap_dss_device *dssdev = omap_connector->dssdev;
    int old_dpms;

    DBG("%s: %d", dssdev->name, mode);

    old_dpms = connector->dpms;

    /* from off to on, do from crtc to connector */
    if (mode < old_dpms)
        drm_helper_connector_dpms(connector, mode);

    if (mode == DRM_MODE_DPMS_ON) {
        /* store resume info for suspended displays */
        switch (dssdev->state) {
        case OMAP_DSS_DISPLAY_SUSPENDED:
            dssdev->activate_after_resume = true;
            break;
        case OMAP_DSS_DISPLAY_DISABLED: {
            int ret = dssdev->driver->enable(dssdev);
            if (ret) {
                DBG("%s: failed to enable: %d",
                        dssdev->name, ret);
                dssdev->driver->disable(dssdev);
            }
            break;
        }
        default:
            break;
        }
    } else {
        /* TODO */
    }

    /* from on to off, do from connector to crtc */
    if (mode > old_dpms)
        drm_helper_connector_dpms(connector, mode);
}

enum drm_connector_status omap_connector_detect(
        struct drm_connector *connector, bool force)
{
    struct omap_connector *omap_connector = to_omap_connector(connector);
    struct omap_dss_device *dssdev = omap_connector->dssdev;
    struct omap_dss_driver *dssdrv = dssdev->driver;
    enum drm_connector_status ret;

    if (dssdrv->detect) {
        if (dssdrv->detect(dssdev)) {
            ret = connector_status_connected;
        } else {
            ret = connector_status_disconnected;
        }
    } else {
        ret = connector_status_unknown;
    }

    VERB("%s: %d (force=%d)", omap_connector->dssdev->name, ret, force);

    return ret;
}

static void omap_connector_destroy(struct drm_connector *connector)
{
    struct omap_connector *omap_connector = to_omap_connector(connector);
    struct omap_dss_device *dssdev = omap_connector->dssdev;

    dssdev->driver->disable(dssdev);

    DBG("%s", omap_connector->dssdev->name);
    drm_sysfs_connector_remove(connector);
    drm_connector_cleanup(connector);
    kfree(omap_connector);

    omap_dss_put_device(dssdev);
}

#define MAX_EDID  512

static int omap_connector_get_modes(struct drm_connector *connector)
{
    struct omap_connector *omap_connector = to_omap_connector(connector);
    struct omap_dss_device *dssdev = omap_connector->dssdev;
    struct omap_dss_driver *dssdrv = dssdev->driver;
    struct drm_device *dev = connector->dev;
    int n = 0;

    DBG("%s", omap_connector->dssdev->name);

    /* if display exposes EDID, then we parse that in the normal way to
     * build table of supported modes.. otherwise (ie. fixed resolution
     * LCD panels) we just return a single mode corresponding to the
     * currently configured timings:
     */
    if (dssdrv->read_edid) {
        void *edid = kzalloc(MAX_EDID, GFP_KERNEL);

        if ((dssdrv->read_edid(dssdev, edid, MAX_EDID) > 0) &&
                drm_edid_is_valid(edid)) {
            drm_mode_connector_update_edid_property(
                    connector, edid);
            n = drm_add_edid_modes(connector, edid);
        } else {
            drm_mode_connector_update_edid_property(
                    connector, NULL);
        }
        kfree(edid);
    } else {
        struct drm_display_mode *mode = drm_mode_create(dev);
        struct omap_video_timings timings = {0};

        dssdrv->get_timings(dssdev, &timings);

        copy_timings_omap_to_drm(mode, &timings);

        mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
        drm_mode_set_name(mode);
        drm_mode_probed_add(connector, mode);

        n = 1;
    }

    return n;
}

static int omap_connector_mode_valid(struct drm_connector *connector,
                 struct drm_display_mode *mode)
{
    struct omap_connector *omap_connector = to_omap_connector(connector);
    struct omap_dss_device *dssdev = omap_connector->dssdev;
    struct omap_dss_driver *dssdrv = dssdev->driver;
    struct omap_video_timings timings = {0};
    struct drm_device *dev = connector->dev;
    struct drm_display_mode *new_mode;
    int ret = MODE_BAD;

    copy_timings_drm_to_omap(&timings, mode);
    mode->vrefresh = drm_mode_vrefresh(mode);

    if (!dssdrv->check_timings(dssdev, &timings)) {
        /* check if vrefresh is still valid */
        new_mode = drm_mode_duplicate(dev, mode);
        new_mode->clock = timings.pixel_clock;
        new_mode->vrefresh = 0;
        if (mode->vrefresh == drm_mode_vrefresh(new_mode))
            ret = MODE_OK;
        drm_mode_destroy(dev, new_mode);
    }

    DBG("connector: mode %s: "
            "%d:\"%s\" %d %d %d %d %d %d %d %d %d %d 0x%x 0x%x",
            (ret == MODE_OK) ? "valid" : "invalid",
            mode->base.id, mode->name, mode->vrefresh, mode->clock,
            mode->hdisplay, mode->hsync_start,
            mode->hsync_end, mode->htotal,
            mode->vdisplay, mode->vsync_start,
            mode->vsync_end, mode->vtotal, mode->type, mode->flags);

    return ret;
}

struct drm_encoder *omap_connector_attached_encoder(
        struct drm_connector *connector)
{
    int i;
    struct omap_connector *omap_connector = to_omap_connector(connector);

    for (i = 0; i < DRM_CONNECTOR_MAX_ENCODER; i++) {
        struct drm_mode_object *obj;

        if (connector->encoder_ids[i] == 0)
            break;

        obj = drm_mode_object_find(connector->dev,
                connector->encoder_ids[i],
                DRM_MODE_OBJECT_ENCODER);

        if (obj) {
            struct drm_encoder *encoder = obj_to_encoder(obj);
            struct omap_overlay_manager *mgr =
                    omap_encoder_get_manager(encoder);
            DBG("%s: found %s", omap_connector->dssdev->name,
                    mgr->name);
            return encoder;
        }
    }

    DBG("%s: no encoder", omap_connector->dssdev->name);

    return NULL;
}

static const struct drm_connector_funcs omap_connector_funcs = {
    .dpms = omap_connector_dpms,
    .detect = omap_connector_detect,
    .fill_modes = drm_helper_probe_single_connector_modes,
    .destroy = omap_connector_destroy,
};

static const struct drm_connector_helper_funcs omap_connector_helper_funcs = {
    .get_modes = omap_connector_get_modes,
    .mode_valid = omap_connector_mode_valid,
    .best_encoder = omap_connector_attached_encoder,
};

/* called from encoder when mode is set, to propagate settings to the dssdev */
void omap_connector_mode_set(struct drm_connector *connector,
        struct drm_display_mode *mode)
{
    struct drm_device *dev = connector->dev;
    struct omap_connector *omap_connector = to_omap_connector(connector);
    struct omap_dss_device *dssdev = omap_connector->dssdev;
    struct omap_dss_driver *dssdrv = dssdev->driver;
    struct omap_video_timings timings = {0};

    copy_timings_drm_to_omap(&timings, mode);

    DBG("%s: set mode: %d:\"%s\" %d %d %d %d %d %d %d %d %d %d 0x%x 0x%x",
            omap_connector->dssdev->name,
            mode->base.id, mode->name, mode->vrefresh, mode->clock,
            mode->hdisplay, mode->hsync_start,
            mode->hsync_end, mode->htotal,
            mode->vdisplay, mode->vsync_start,
            mode->vsync_end, mode->vtotal, mode->type, mode->flags);

    if (dssdrv->check_timings(dssdev, &timings)) {
        dev_err(dev->dev, "could not set timings\n");
        return;
    }

    dssdrv->set_timings(dssdev, &timings);
}

/* flush an area of the framebuffer (in case of manual update display that
 * is not automatically flushed)
 */
void omap_connector_flush(struct drm_connector *connector,
        int x, int y, int w, int h)
{
    struct omap_connector *omap_connector = to_omap_connector(connector);

    /* TODO: enable when supported in dss */
    VERB("%s: %d,%d, %dx%d", omap_connector->dssdev->name, x, y, w, h);
}

/* initialize connector */
struct drm_connector *omap_connector_init(struct drm_device *dev,
        int connector_type, struct omap_dss_device *dssdev)
{
    struct drm_connector *connector = NULL;
    struct omap_connector *omap_connector;

    DBG("%s", dssdev->name);

    omap_dss_get_device(dssdev);

    omap_connector = kzalloc(sizeof(struct omap_connector), GFP_KERNEL);
    if (!omap_connector) {
        dev_err(dev->dev, "could not allocate connector\n");
        goto fail;
    }

    omap_connector->dssdev = dssdev;
    connector = &omap_connector->base;

    drm_connector_init(dev, connector, &omap_connector_funcs,
                connector_type);
    drm_connector_helper_add(connector, &omap_connector_helper_funcs);

#if 0 /* enable when dss2 supports hotplug */
    if (dssdev->caps & OMAP_DSS_DISPLAY_CAP_HPD)
        connector->polled = 0;
    else
#endif
        connector->polled = DRM_CONNECTOR_POLL_CONNECT |
                DRM_CONNECTOR_POLL_DISCONNECT;

    connector->interlace_allowed = 1;
    connector->doublescan_allowed = 0;

    drm_sysfs_connector_add(connector);

    return connector;

fail:
    if (connector) {
        omap_connector_destroy(connector);
    }

    return NULL;
}