powerpc: use consistent types in mktree

[zen-stable.git] / drivers / gpu / drm / drm_modes.c

/*
 * The list_sort function is (presumably) licensed under the GPL (see the
 * top level "COPYING" file for details).
 *
 * The remainder of this file is:
 *
 * Copyright © 1997-2003 by The XFree86 Project, Inc.
 * Copyright © 2007 Dave Airlie
 * Copyright © 2007-2008 Intel Corporation
 *   Jesse Barnes <jesse.barnes@intel.com>
 *
 * 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 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 HOLDER(S) OR AUTHOR(S) 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.
 *
 * Except as contained in this notice, the name of the copyright holder(s)
 * and author(s) shall not be used in advertising or otherwise to promote
 * the sale, use or other dealings in this Software without prior written
 * authorization from the copyright holder(s) and author(s).
 */

#include <linux/list.h>
#include "drmP.h"
#include "drm.h"
#include "drm_crtc.h"

#define DRM_MODESET_DEBUG       "drm_mode"
/**
 * drm_mode_debug_printmodeline - debug print a mode
 * @dev: DRM device
 * @mode: mode to print
 *
 * LOCKING:
 * None.
 *
 * Describe @mode using DRM_DEBUG.
 */
void drm_mode_debug_printmodeline(struct drm_display_mode *mode)
{
        DRM_DEBUG_MODE(DRM_MODESET_DEBUG,
                "Modeline %d:\"%s\" %d %d %d %d %d %d %d %d %d %d 0x%x 0x%x\n",
                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);
}
EXPORT_SYMBOL(drm_mode_debug_printmodeline);

/**
 * drm_mode_set_name - set the name on a mode
 * @mode: name will be set in this mode
 *
 * LOCKING:
 * None.
 *
 * Set the name of @mode to a standard format.
 */
void drm_mode_set_name(struct drm_display_mode *mode)
{
        snprintf(mode->name, DRM_DISPLAY_MODE_LEN, "%dx%d", mode->hdisplay,
                 mode->vdisplay);
}
EXPORT_SYMBOL(drm_mode_set_name);

/**
 * drm_mode_list_concat - move modes from one list to another
 * @head: source list
 * @new: dst list
 *
 * LOCKING:
 * Caller must ensure both lists are locked.
 *
 * Move all the modes from @head to @new.
 */
void drm_mode_list_concat(struct list_head *head, struct list_head *new)
{

        struct list_head *entry, *tmp;

        list_for_each_safe(entry, tmp, head) {
                list_move_tail(entry, new);
        }
}
EXPORT_SYMBOL(drm_mode_list_concat);

/**
 * drm_mode_width - get the width of a mode
 * @mode: mode
 *
 * LOCKING:
 * None.
 *
 * Return @mode's width (hdisplay) value.
 *
 * FIXME: is this needed?
 *
 * RETURNS:
 * @mode->hdisplay
 */
int drm_mode_width(struct drm_display_mode *mode)
{
        return mode->hdisplay;

}
EXPORT_SYMBOL(drm_mode_width);

/**
 * drm_mode_height - get the height of a mode
 * @mode: mode
 *
 * LOCKING:
 * None.
 *
 * Return @mode's height (vdisplay) value.
 *
 * FIXME: is this needed?
 *
 * RETURNS:
 * @mode->vdisplay
 */
int drm_mode_height(struct drm_display_mode *mode)
{
        return mode->vdisplay;
}
EXPORT_SYMBOL(drm_mode_height);

/**
 * drm_mode_vrefresh - get the vrefresh of a mode
 * @mode: mode
 *
 * LOCKING:
 * None.
 *
 * Return @mode's vrefresh rate or calculate it if necessary.
 *
 * FIXME: why is this needed?  shouldn't vrefresh be set already?
 *
 * RETURNS:
 * Vertical refresh rate of @mode x 1000. For precision reasons.
 */
int drm_mode_vrefresh(struct drm_display_mode *mode)
{
        int refresh = 0;
        unsigned int calc_val;

        if (mode->vrefresh > 0)
                refresh = mode->vrefresh;
        else if (mode->htotal > 0 && mode->vtotal > 0) {
                /* work out vrefresh the value will be x1000 */
                calc_val = (mode->clock * 1000);

                calc_val /= mode->htotal;
                calc_val *= 1000;
                calc_val /= mode->vtotal;

                refresh = calc_val;
                if (mode->flags & DRM_MODE_FLAG_INTERLACE)
                        refresh *= 2;
                if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
                        refresh /= 2;
                if (mode->vscan > 1)
                        refresh /= mode->vscan;
        }
        return refresh;
}
EXPORT_SYMBOL(drm_mode_vrefresh);

/**
 * drm_mode_set_crtcinfo - set CRTC modesetting parameters
 * @p: mode
 * @adjust_flags: unused? (FIXME)
 *
 * LOCKING:
 * None.
 *
 * Setup the CRTC modesetting parameters for @p, adjusting if necessary.
 */
void drm_mode_set_crtcinfo(struct drm_display_mode *p, int adjust_flags)
{
        if ((p == NULL) || ((p->type & DRM_MODE_TYPE_CRTC_C) == DRM_MODE_TYPE_BUILTIN))
                return;

        p->crtc_hdisplay = p->hdisplay;
        p->crtc_hsync_start = p->hsync_start;
        p->crtc_hsync_end = p->hsync_end;
        p->crtc_htotal = p->htotal;
        p->crtc_hskew = p->hskew;
        p->crtc_vdisplay = p->vdisplay;
        p->crtc_vsync_start = p->vsync_start;
        p->crtc_vsync_end = p->vsync_end;
        p->crtc_vtotal = p->vtotal;

        if (p->flags & DRM_MODE_FLAG_INTERLACE) {
                if (adjust_flags & CRTC_INTERLACE_HALVE_V) {
                        p->crtc_vdisplay /= 2;
                        p->crtc_vsync_start /= 2;
                        p->crtc_vsync_end /= 2;
                        p->crtc_vtotal /= 2;
                }

                p->crtc_vtotal |= 1;
        }

        if (p->flags & DRM_MODE_FLAG_DBLSCAN) {
                p->crtc_vdisplay *= 2;
                p->crtc_vsync_start *= 2;
                p->crtc_vsync_end *= 2;
                p->crtc_vtotal *= 2;
        }

        if (p->vscan > 1) {
                p->crtc_vdisplay *= p->vscan;
                p->crtc_vsync_start *= p->vscan;
                p->crtc_vsync_end *= p->vscan;
                p->crtc_vtotal *= p->vscan;
        }

        p->crtc_vblank_start = min(p->crtc_vsync_start, p->crtc_vdisplay);
        p->crtc_vblank_end = max(p->crtc_vsync_end, p->crtc_vtotal);
        p->crtc_hblank_start = min(p->crtc_hsync_start, p->crtc_hdisplay);
        p->crtc_hblank_end = max(p->crtc_hsync_end, p->crtc_htotal);

        p->crtc_hadjusted = false;
        p->crtc_vadjusted = false;
}
EXPORT_SYMBOL(drm_mode_set_crtcinfo);


/**
 * drm_mode_duplicate - allocate and duplicate an existing mode
 * @m: mode to duplicate
 *
 * LOCKING:
 * None.
 *
 * Just allocate a new mode, copy the existing mode into it, and return
 * a pointer to it.  Used to create new instances of established modes.
 */
struct drm_display_mode *drm_mode_duplicate(struct drm_device *dev,
                                            struct drm_display_mode *mode)
{
        struct drm_display_mode *nmode;
        int new_id;

        nmode = drm_mode_create(dev);
        if (!nmode)
                return NULL;

        new_id = nmode->base.id;
        *nmode = *mode;
        nmode->base.id = new_id;
        INIT_LIST_HEAD(&nmode->head);
        return nmode;
}
EXPORT_SYMBOL(drm_mode_duplicate);

/**
 * drm_mode_equal - test modes for equality
 * @mode1: first mode
 * @mode2: second mode
 *
 * LOCKING:
 * None.
 *
 * Check to see if @mode1 and @mode2 are equivalent.
 *
 * RETURNS:
 * True if the modes are equal, false otherwise.
 */
bool drm_mode_equal(struct drm_display_mode *mode1, struct drm_display_mode *mode2)
{
        /* do clock check convert to PICOS so fb modes get matched
         * the same */
        if (mode1->clock && mode2->clock) {
                if (KHZ2PICOS(mode1->clock) != KHZ2PICOS(mode2->clock))
                        return false;
        } else if (mode1->clock != mode2->clock)
                return false;

        if (mode1->hdisplay == mode2->hdisplay &&
            mode1->hsync_start == mode2->hsync_start &&
            mode1->hsync_end == mode2->hsync_end &&
            mode1->htotal == mode2->htotal &&
            mode1->hskew == mode2->hskew &&
            mode1->vdisplay == mode2->vdisplay &&
            mode1->vsync_start == mode2->vsync_start &&
            mode1->vsync_end == mode2->vsync_end &&
            mode1->vtotal == mode2->vtotal &&
            mode1->vscan == mode2->vscan &&
            mode1->flags == mode2->flags)
                return true;

        return false;
}
EXPORT_SYMBOL(drm_mode_equal);

/**
 * drm_mode_validate_size - make sure modes adhere to size constraints
 * @dev: DRM device
 * @mode_list: list of modes to check
 * @maxX: maximum width
 * @maxY: maximum height
 * @maxPitch: max pitch
 *
 * LOCKING:
 * Caller must hold a lock protecting @mode_list.
 *
 * The DRM device (@dev) has size and pitch limits.  Here we validate the
 * modes we probed for @dev against those limits and set their status as
 * necessary.
 */
void drm_mode_validate_size(struct drm_device *dev,
                            struct list_head *mode_list,
                            int maxX, int maxY, int maxPitch)
{
        struct drm_display_mode *mode;

        list_for_each_entry(mode, mode_list, head) {
                if (maxPitch > 0 && mode->hdisplay > maxPitch)
                        mode->status = MODE_BAD_WIDTH;

                if (maxX > 0 && mode->hdisplay > maxX)
                        mode->status = MODE_VIRTUAL_X;

                if (maxY > 0 && mode->vdisplay > maxY)
                        mode->status = MODE_VIRTUAL_Y;
        }
}
EXPORT_SYMBOL(drm_mode_validate_size);

/**
 * drm_mode_validate_clocks - validate modes against clock limits
 * @dev: DRM device
 * @mode_list: list of modes to check
 * @min: minimum clock rate array
 * @max: maximum clock rate array
 * @n_ranges: number of clock ranges (size of arrays)
 *
 * LOCKING:
 * Caller must hold a lock protecting @mode_list.
 *
 * Some code may need to check a mode list against the clock limits of the
 * device in question.  This function walks the mode list, testing to make
 * sure each mode falls within a given range (defined by @min and @max
 * arrays) and sets @mode->status as needed.
 */
void drm_mode_validate_clocks(struct drm_device *dev,
                              struct list_head *mode_list,
                              int *min, int *max, int n_ranges)
{
        struct drm_display_mode *mode;
        int i;

        list_for_each_entry(mode, mode_list, head) {
                bool good = false;
                for (i = 0; i < n_ranges; i++) {
                        if (mode->clock >= min[i] && mode->clock <= max[i]) {
                                good = true;
                                break;
                        }
                }
                if (!good)
                        mode->status = MODE_CLOCK_RANGE;
        }
}
EXPORT_SYMBOL(drm_mode_validate_clocks);

/**
 * drm_mode_prune_invalid - remove invalid modes from mode list
 * @dev: DRM device
 * @mode_list: list of modes to check
 * @verbose: be verbose about it
 *
 * LOCKING:
 * Caller must hold a lock protecting @mode_list.
 *
 * Once mode list generation is complete, a caller can use this routine to
 * remove invalid modes from a mode list.  If any of the modes have a
 * status other than %MODE_OK, they are removed from @mode_list and freed.
 */
void drm_mode_prune_invalid(struct drm_device *dev,
                            struct list_head *mode_list, bool verbose)
{
        struct drm_display_mode *mode, *t;

        list_for_each_entry_safe(mode, t, mode_list, head) {
                if (mode->status != MODE_OK) {
                        list_del(&mode->head);
                        if (verbose) {
                                drm_mode_debug_printmodeline(mode);
                                DRM_DEBUG_MODE(DRM_MODESET_DEBUG,
                                        "Not using %s mode %d\n",
                                        mode->name, mode->status);
                        }
                        drm_mode_destroy(dev, mode);
                }
        }
}
EXPORT_SYMBOL(drm_mode_prune_invalid);

/**
 * drm_mode_compare - compare modes for favorability
 * @lh_a: list_head for first mode
 * @lh_b: list_head for second mode
 *
 * LOCKING:
 * None.
 *
 * Compare two modes, given by @lh_a and @lh_b, returning a value indicating
 * which is better.
 *
 * RETURNS:
 * Negative if @lh_a is better than @lh_b, zero if they're equivalent, or
 * positive if @lh_b is better than @lh_a.
 */
static int drm_mode_compare(struct list_head *lh_a, struct list_head *lh_b)
{
        struct drm_display_mode *a = list_entry(lh_a, struct drm_display_mode, head);
        struct drm_display_mode *b = list_entry(lh_b, struct drm_display_mode, head);
        int diff;

        diff = ((b->type & DRM_MODE_TYPE_PREFERRED) != 0) -
                ((a->type & DRM_MODE_TYPE_PREFERRED) != 0);
        if (diff)
                return diff;
        diff = b->hdisplay * b->vdisplay - a->hdisplay * a->vdisplay;
        if (diff)
                return diff;
        diff = b->clock - a->clock;
        return diff;
}

/* FIXME: what we don't have a list sort function? */
/* list sort from Mark J Roberts (mjr@znex.org) */
void list_sort(struct list_head *head,
               int (*cmp)(struct list_head *a, struct list_head *b))
{
        struct list_head *p, *q, *e, *list, *tail, *oldhead;
        int insize, nmerges, psize, qsize, i;

        list = head->next;
        list_del(head);
        insize = 1;
        for (;;) {
                p = oldhead = list;
                list = tail = NULL;
                nmerges = 0;

                while (p) {
                        nmerges++;
                        q = p;
                        psize = 0;
                        for (i = 0; i < insize; i++) {
                                psize++;
                                q = q->next == oldhead ? NULL : q->next;
                                if (!q)
                                        break;
                        }

                        qsize = insize;
                        while (psize > 0 || (qsize > 0 && q)) {
                                if (!psize) {
                                        e = q;
                                        q = q->next;
                                        qsize--;
                                        if (q == oldhead)
                                                q = NULL;
                                } else if (!qsize || !q) {
                                        e = p;
                                        p = p->next;
                                        psize--;
                                        if (p == oldhead)
                                                p = NULL;
                                } else if (cmp(p, q) <= 0) {
                                        e = p;
                                        p = p->next;
                                        psize--;
                                        if (p == oldhead)
                                                p = NULL;
                                } else {
                                        e = q;
                                        q = q->next;
                                        qsize--;
                                        if (q == oldhead)
                                                q = NULL;
                                }
                                if (tail)
                                        tail->next = e;
                                else
                                        list = e;
                                e->prev = tail;
                                tail = e;
                        }
                        p = q;
                }

                tail->next = list;
                list->prev = tail;

                if (nmerges <= 1)
                        break;

                insize *= 2;
        }

        head->next = list;
        head->prev = list->prev;
        list->prev->next = head;
        list->prev = head;
}

/**
 * drm_mode_sort - sort mode list
 * @mode_list: list to sort
 *
 * LOCKING:
 * Caller must hold a lock protecting @mode_list.
 *
 * Sort @mode_list by favorability, putting good modes first.
 */
void drm_mode_sort(struct list_head *mode_list)
{
        list_sort(mode_list, drm_mode_compare);
}
EXPORT_SYMBOL(drm_mode_sort);

/**
 * drm_mode_connector_list_update - update the mode list for the connector
 * @connector: the connector to update
 *
 * LOCKING:
 * Caller must hold a lock protecting @mode_list.
 *
 * This moves the modes from the @connector probed_modes list
 * to the actual mode list. It compares the probed mode against the current
 * list and only adds different modes. All modes unverified after this point
 * will be removed by the prune invalid modes.
 */
void drm_mode_connector_list_update(struct drm_connector *connector)
{
        struct drm_display_mode *mode;
        struct drm_display_mode *pmode, *pt;
        int found_it;

        list_for_each_entry_safe(pmode, pt, &connector->probed_modes,
                                 head) {
                found_it = 0;
                /* go through current modes checking for the new probed mode */
                list_for_each_entry(mode, &connector->modes, head) {
                        if (drm_mode_equal(pmode, mode)) {
                                found_it = 1;
                                /* if equal delete the probed mode */
                                mode->status = pmode->status;
                                /* Merge type bits together */
                                mode->type |= pmode->type;
                                list_del(&pmode->head);
                                drm_mode_destroy(connector->dev, pmode);
                                break;
                        }
                }

                if (!found_it) {
                        list_move_tail(&pmode->head, &connector->modes);
                }
        }
}
EXPORT_SYMBOL(drm_mode_connector_list_update);