/*
* 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"
/**
* 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("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("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;
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);
