1 files changed, 576 insertions, 0 deletions

diff --git a/drivers/gpu/drm/drm_modes.c b/drivers/gpu/drm/drm_modes.c
new file mode 100644
index 000000000000..c9b80fdd4630
--- /dev/null
+++ b/drivers/gpu/drm/drm_modes.c
@@ -0,0 +1,576 @@
+/*
+ * 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);