drm/i915: copy&paste drm_crtc_helper_set_config

And the following static functions required by it:
drm_encoder_crtc_ok, drm_crtc_helper_disable

No changes safe for the s/drm/intel prefix change.

Acked-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-Off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

1 files changed, 313 insertions, 1 deletions

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 07077b1fcd7b..33a519117e2f 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -6590,12 +6590,324 @@ static struct drm_crtc_helper_funcs intel_helper_funcs = {
         .disable = intel_crtc_disable,
 };
 
+static bool intel_encoder_crtc_ok(struct drm_encoder *encoder,
+                                  struct drm_crtc *crtc)
+{
+        struct drm_device *dev;
+        struct drm_crtc *tmp;
+        int crtc_mask = 1;
+
+        WARN(!crtc, "checking null crtc?\n");
+
+        dev = crtc->dev;
+
+        list_for_each_entry(tmp, &dev->mode_config.crtc_list, head) {
+                if (tmp == crtc)
+                        break;
+                crtc_mask <<= 1;
+        }
+
+        if (encoder->possible_crtcs & crtc_mask)
+                return true;
+        return false;
+}
+
+static int
+intel_crtc_helper_disable(struct drm_crtc *crtc)
+{
+        struct drm_device *dev = crtc->dev;
+        struct drm_connector *connector;
+        struct drm_encoder *encoder;
+
+        /* Decouple all encoders and their attached connectors from this crtc */
+        list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
+                if (encoder->crtc != crtc)
+                        continue;
+
+                list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
+                        if (connector->encoder != encoder)
+                                continue;
+
+                        connector->encoder = NULL;
+                }
+        }
+
+        drm_helper_disable_unused_functions(dev);
+        return 0;
+}
+
+static int intel_crtc_set_config(struct drm_mode_set *set)
+{
+        struct drm_device *dev;
+        struct drm_crtc *save_crtcs, *new_crtc, *crtc;
+        struct drm_encoder *save_encoders, *new_encoder, *encoder;
+        struct drm_framebuffer *old_fb = NULL;
+        bool mode_changed = false; /* if true do a full mode set */
+        bool fb_changed = false; /* if true and !mode_changed just do a flip */
+        struct drm_connector *save_connectors, *connector;
+        int count = 0, ro, fail = 0;
+        struct drm_crtc_helper_funcs *crtc_funcs;
+        struct drm_mode_set save_set;
+        int ret;
+        int i;
+
+        DRM_DEBUG_KMS("\n");
+
+        if (!set)
+                return -EINVAL;
+
+        if (!set->crtc)
+                return -EINVAL;
+
+        if (!set->crtc->helper_private)
+                return -EINVAL;
+
+        crtc_funcs = set->crtc->helper_private;
+
+        if (!set->mode)
+                set->fb = NULL;
+
+        if (set->fb) {
+                DRM_DEBUG_KMS("[CRTC:%d] [FB:%d] #connectors=%d (x y) (%i %i)\n",
+                                set->crtc->base.id, set->fb->base.id,
+                                (int)set->num_connectors, set->x, set->y);
+        } else {
+                DRM_DEBUG_KMS("[CRTC:%d] [NOFB]\n", set->crtc->base.id);
+                return intel_crtc_helper_disable(set->crtc);
+        }
+
+        dev = set->crtc->dev;
+
+        /* Allocate space for the backup of all (non-pointer) crtc, encoder and
+         * connector data. */
+        save_crtcs = kzalloc(dev->mode_config.num_crtc *
+                             sizeof(struct drm_crtc), GFP_KERNEL);
+        if (!save_crtcs)
+                return -ENOMEM;
+
+        save_encoders = kzalloc(dev->mode_config.num_encoder *
+                                sizeof(struct drm_encoder), GFP_KERNEL);
+        if (!save_encoders) {
+                kfree(save_crtcs);
+                return -ENOMEM;
+        }
+
+        save_connectors = kzalloc(dev->mode_config.num_connector *
+                                sizeof(struct drm_connector), GFP_KERNEL);
+        if (!save_connectors) {
+                kfree(save_crtcs);
+                kfree(save_encoders);
+                return -ENOMEM;
+        }
+
+        /* Copy data. Note that driver private data is not affected.
+         * Should anything bad happen only the expected state is
+         * restored, not the drivers personal bookkeeping.
+         */
+        count = 0;
+        list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
+                save_crtcs[count++] = *crtc;
+        }
+
+        count = 0;
+        list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
+                save_encoders[count++] = *encoder;
+        }
+
+        count = 0;
+        list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
+                save_connectors[count++] = *connector;
+        }
+
+        save_set.crtc = set->crtc;
+        save_set.mode = &set->crtc->mode;
+        save_set.x = set->crtc->x;
+        save_set.y = set->crtc->y;
+        save_set.fb = set->crtc->fb;
+
+        /* We should be able to check here if the fb has the same properties
+         * and then just flip_or_move it */
+        if (set->crtc->fb != set->fb) {
+                /* If we have no fb then treat it as a full mode set */
+                if (set->crtc->fb == NULL) {
+                        DRM_DEBUG_KMS("crtc has no fb, full mode set\n");
+                        mode_changed = true;
+                } else if (set->fb == NULL) {
+                        mode_changed = true;
+                } else if (set->fb->depth != set->crtc->fb->depth) {
+                        mode_changed = true;
+                } else if (set->fb->bits_per_pixel !=
+                           set->crtc->fb->bits_per_pixel) {
+                        mode_changed = true;
+                } else
+                        fb_changed = true;
+        }
+
+        if (set->x != set->crtc->x || set->y != set->crtc->y)
+                fb_changed = true;
+
+        if (set->mode && !drm_mode_equal(set->mode, &set->crtc->mode)) {
+                DRM_DEBUG_KMS("modes are different, full mode set\n");
+                drm_mode_debug_printmodeline(&set->crtc->mode);
+                drm_mode_debug_printmodeline(set->mode);
+                mode_changed = true;
+        }
+
+        /* a) traverse passed in connector list and get encoders for them */
+        count = 0;
+        list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
+                struct drm_connector_helper_funcs *connector_funcs =
+                        connector->helper_private;
+                new_encoder = connector->encoder;
+                for (ro = 0; ro < set->num_connectors; ro++) {
+                        if (set->connectors[ro] == connector) {
+                                new_encoder = connector_funcs->best_encoder(connector);
+                                /* if we can't get an encoder for a connector
+                                   we are setting now - then fail */
+                                if (new_encoder == NULL)
+                                        /* don't break so fail path works correct */
+                                        fail = 1;
+                                break;
+                        }
+                }
+
+                if (new_encoder != connector->encoder) {
+                        DRM_DEBUG_KMS("encoder changed, full mode switch\n");
+                        mode_changed = true;
+                        /* If the encoder is reused for another connector, then
+                         * the appropriate crtc will be set later.
+                         */
+                        if (connector->encoder)
+                                connector->encoder->crtc = NULL;
+                        connector->encoder = new_encoder;
+                }
+        }
+
+        if (fail) {
+                ret = -EINVAL;
+                goto fail;
+        }
+
+        count = 0;
+        list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
+                if (!connector->encoder)
+                        continue;
+
+                if (connector->encoder->crtc == set->crtc)
+                        new_crtc = NULL;
+                else
+                        new_crtc = connector->encoder->crtc;
+
+                for (ro = 0; ro < set->num_connectors; ro++) {
+                        if (set->connectors[ro] == connector)
+                                new_crtc = set->crtc;
+                }
+
+                /* Make sure the new CRTC will work with the encoder */
+                if (new_crtc &&
+                    !intel_encoder_crtc_ok(connector->encoder, new_crtc)) {
+                        ret = -EINVAL;
+                        goto fail;
+                }
+                if (new_crtc != connector->encoder->crtc) {
+                        DRM_DEBUG_KMS("crtc changed, full mode switch\n");
+                        mode_changed = true;
+                        connector->encoder->crtc = new_crtc;
+                }
+                if (new_crtc) {
+                        DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [CRTC:%d]\n",
+                                connector->base.id, drm_get_connector_name(connector),
+                                new_crtc->base.id);
+                } else {
+                        DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [NOCRTC]\n",
+                                connector->base.id, drm_get_connector_name(connector));
+                }
+        }
+
+        /* mode_set_base is not a required function */
+        if (fb_changed && !crtc_funcs->mode_set_base)
+                mode_changed = true;
+
+        if (mode_changed) {
+                set->crtc->enabled = drm_helper_crtc_in_use(set->crtc);
+                if (set->crtc->enabled) {
+                        DRM_DEBUG_KMS("attempting to set mode from"
+                                        " userspace\n");
+                        drm_mode_debug_printmodeline(set->mode);
+                        old_fb = set->crtc->fb;
+                        set->crtc->fb = set->fb;
+                        if (!drm_crtc_helper_set_mode(set->crtc, set->mode,
+                                                      set->x, set->y,
+                                                      old_fb)) {
+                                DRM_ERROR("failed to set mode on [CRTC:%d]\n",
+                                          set->crtc->base.id);
+                                set->crtc->fb = old_fb;
+                                ret = -EINVAL;
+                                goto fail;
+                        }
+                        DRM_DEBUG_KMS("Setting connector DPMS state to on\n");
+                        for (i = 0; i < set->num_connectors; i++) {
+                                DRM_DEBUG_KMS("\t[CONNECTOR:%d:%s] set DPMS on\n", set->connectors[i]->base.id,
+                                              drm_get_connector_name(set->connectors[i]));
+                                set->connectors[i]->funcs->dpms(set->connectors[i], DRM_MODE_DPMS_ON);
+                        }
+                }
+                drm_helper_disable_unused_functions(dev);
+        } else if (fb_changed) {
+                set->crtc->x = set->x;
+                set->crtc->y = set->y;
+
+                old_fb = set->crtc->fb;
+                if (set->crtc->fb != set->fb)
+                        set->crtc->fb = set->fb;
+                ret = crtc_funcs->mode_set_base(set->crtc,
+                                                set->x, set->y, old_fb);
+                if (ret != 0) {
+                        set->crtc->fb = old_fb;
+                        goto fail;
+                }
+        }
+
+        kfree(save_connectors);
+        kfree(save_encoders);
+        kfree(save_crtcs);
+        return 0;
+
+fail:
+        /* Restore all previous data. */
+        count = 0;
+        list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
+                *crtc = save_crtcs[count++];
+        }
+
+        count = 0;
+        list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
+                *encoder = save_encoders[count++];
+        }
+
+        count = 0;
+        list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
+                *connector = save_connectors[count++];
+        }
+
+        /* Try to restore the config */
+        if (mode_changed &&
+            !drm_crtc_helper_set_mode(save_set.crtc, save_set.mode, save_set.x,
+                                      save_set.y, save_set.fb))
+                DRM_ERROR("failed to restore config after modeset failure\n");
+
+        kfree(save_connectors);
+        kfree(save_encoders);
+        kfree(save_crtcs);
+        return ret;
+}
+
 static const struct drm_crtc_funcs intel_crtc_funcs = {
         .reset = intel_crtc_reset,
         .cursor_set = intel_crtc_cursor_set,
         .cursor_move = intel_crtc_cursor_move,
         .gamma_set = intel_crtc_gamma_set,
-        .set_config = drm_crtc_helper_set_config,
+        .set_config = intel_crtc_set_config,
         .destroy = intel_crtc_destroy,
         .page_flip = intel_crtc_page_flip,
 };