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Diffstat (limited to 'linux-core/drm_crtc_helper.c')
-rw-r--r--linux-core/drm_crtc_helper.c515
1 files changed, 515 insertions, 0 deletions
diff --git a/linux-core/drm_crtc_helper.c b/linux-core/drm_crtc_helper.c
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+
+/*
+ * Copyright (c) 2006-2007 Intel Corporation
+ * Copyright (c) 2007 Dave Airlie <airlied@linux.ie>
+ *
+ * DRM core CRTC related functions
+ *
+ * Permission to use, copy, modify, distribute, and sell this software and its
+ * documentation for any purpose is hereby granted without fee, provided that
+ * the above copyright notice appear in all copies and that both that copyright
+ * notice and this permission notice appear in supporting documentation, and
+ * that the name of the copyright holders not be used in advertising or
+ * publicity pertaining to distribution of the software without specific,
+ * written prior permission. The copyright holders make no representations
+ * about the suitability of this software for any purpose. It is provided "as
+ * is" without express or implied warranty.
+ *
+ * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
+ * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
+ * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
+ * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
+ * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
+ * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
+ * OF THIS SOFTWARE.
+ *
+ * Authors:
+ * Keith Packard
+ * Eric Anholt <eric@anholt.net>
+ * Dave Airlie <airlied@linux.ie>
+ * Jesse Barnes <jesse.barnes@intel.com>
+ */
+
+#include "drmP.h"
+#include "drm_crtc.h"
+#include "drm_crtc_helper.h"
+
+
+/**
+ * drm_pick_crtcs - pick crtcs for output devices
+ * @dev: DRM device
+ *
+ * LOCKING:
+ * Caller must hold mode config lock.
+ */
+static void drm_pick_crtcs (struct drm_device *dev)
+{
+ int c, o, assigned;
+ struct drm_output *output, *output_equal;
+ struct drm_crtc *crtc;
+ struct drm_display_mode *des_mode = NULL, *modes, *modes_equal;
+ int found;
+
+ list_for_each_entry(output, &dev->mode_config.output_list, head) {
+ output->crtc = NULL;
+
+ /* Don't hook up outputs that are disconnected ??
+ *
+ * This is debateable. Do we want fixed /dev/fbX or
+ * dynamic on hotplug (need mode code for that though) ?
+ *
+ * If we don't hook up outputs now, then we only create
+ * /dev/fbX for the output that's enabled, that's good as
+ * the users console will be on that output.
+ *
+ * If we do hook up outputs that are disconnected now, then
+ * the user may end up having to muck about with the fbcon
+ * map flags to assign his console to the enabled output. Ugh.
+ */
+ if (output->status != output_status_connected)
+ continue;
+
+ if (list_empty(&output->modes))
+ continue;
+
+ des_mode = NULL;
+ found = 0;
+ list_for_each_entry(des_mode, &output->modes, head) {
+ if (des_mode->type & DRM_MODE_TYPE_PREFERRED) {
+ found = 1;
+ break;
+ }
+ }
+
+ /* No preferred mode, let's just select the first available */
+ if (!found) {
+ des_mode = NULL;
+ list_for_each_entry(des_mode, &output->modes, head) {
+ break;
+ }
+ }
+
+ c = -1;
+ list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
+ assigned = 0;
+
+ c++;
+ if ((output->possible_crtcs & (1 << c)) == 0)
+ continue;
+
+ list_for_each_entry(output_equal, &dev->mode_config.output_list, head) {
+ if (output->id == output_equal->id)
+ continue;
+
+ /* Find out if crtc has been assigned before */
+ if (output_equal->crtc == crtc)
+ assigned = 1;
+ }
+
+#if 1 /* continue for now */
+ if (assigned)
+ continue;
+#endif
+
+ o = -1;
+ list_for_each_entry(output_equal, &dev->mode_config.output_list, head) {
+ o++;
+ if (output->id == output_equal->id)
+ continue;
+
+ list_for_each_entry(modes, &output->modes, head) {
+ list_for_each_entry(modes_equal, &output_equal->modes, head) {
+ if (drm_mode_equal (modes, modes_equal)) {
+ if ((output->possible_clones & output_equal->possible_clones) && (output_equal->crtc == crtc)) {
+ printk("Cloning %s (0x%lx) to %s (0x%lx)\n",drm_get_output_name(output),output->possible_clones,drm_get_output_name(output_equal),output_equal->possible_clones);
+ des_mode = modes;
+ assigned = 0;
+ goto clone;
+ }
+ }
+ }
+ }
+ }
+
+clone:
+ /* crtc has been assigned skip it */
+ if (assigned)
+ continue;
+
+ /* Found a CRTC to attach to, do it ! */
+ output->crtc = crtc;
+ output->crtc->desired_mode = des_mode;
+ output->initial_x = 0;
+ output->initial_y = 0;
+ DRM_DEBUG("Desired mode for CRTC %d is 0x%x:%s\n",c,des_mode->mode_id, des_mode->name);
+ break;
+ }
+ }
+}
+EXPORT_SYMBOL(drm_pick_crtcs);
+
+/**
+ * drm_crtc_set_mode - set a mode
+ * @crtc: CRTC to program
+ * @mode: mode to use
+ * @x: width of mode
+ * @y: height of mode
+ *
+ * LOCKING:
+ * Caller must hold mode config lock.
+ *
+ * Try to set @mode on @crtc. Give @crtc and its associated outputs a chance
+ * to fixup or reject the mode prior to trying to set it.
+ *
+ * RETURNS:
+ * True if the mode was set successfully, or false otherwise.
+ */
+bool drm_crtc_helper_set_mode(struct drm_crtc *crtc, struct drm_display_mode *mode,
+ int x, int y)
+{
+ struct drm_device *dev = crtc->dev;
+ struct drm_display_mode *adjusted_mode, saved_mode;
+ struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
+ struct drm_output_helper_funcs *output_funcs;
+ int saved_x, saved_y;
+ struct drm_output *output;
+ bool ret = true;
+
+ adjusted_mode = drm_mode_duplicate(dev, mode);
+
+ crtc->enabled = drm_crtc_in_use(crtc);
+
+ if (!crtc->enabled)
+ return true;
+
+ saved_mode = crtc->mode;
+ saved_x = crtc->x;
+ saved_y = crtc->y;
+
+ /* Update crtc values up front so the driver can rely on them for mode
+ * setting.
+ */
+ crtc->mode = *mode;
+ crtc->x = x;
+ crtc->y = y;
+
+ if (drm_mode_equal(&saved_mode, &crtc->mode)) {
+ if (saved_x != crtc->x || saved_y != crtc->y) {
+ crtc_funcs->mode_set_base(crtc, crtc->x, crtc->y);
+ goto done;
+ }
+ }
+
+ /* Pass our mode to the outputs and the CRTC to give them a chance to
+ * adjust it according to limitations or output properties, and also
+ * a chance to reject the mode entirely.
+ */
+ list_for_each_entry(output, &dev->mode_config.output_list, head) {
+
+ if (output->crtc != crtc)
+ continue;
+ output_funcs = output->helper_private;
+ if (!(ret = output_funcs->mode_fixup(output, mode, adjusted_mode))) {
+ goto done;
+ }
+ }
+
+ if (!(ret = crtc_funcs->mode_fixup(crtc, mode, adjusted_mode))) {
+ goto done;
+ }
+
+ /* Prepare the outputs and CRTCs before setting the mode. */
+ list_for_each_entry(output, &dev->mode_config.output_list, head) {
+
+ if (output->crtc != crtc)
+ continue;
+ output_funcs = output->helper_private;
+ /* Disable the output as the first thing we do. */
+ output_funcs->prepare(output);
+ }
+
+ crtc_funcs->prepare(crtc);
+
+ /* Set up the DPLL and any output state that needs to adjust or depend
+ * on the DPLL.
+ */
+ crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y);
+
+ list_for_each_entry(output, &dev->mode_config.output_list, head) {
+
+ if (output->crtc != crtc)
+ continue;
+
+ DRM_INFO("%s: set mode %s %x\n", drm_get_output_name(output), mode->name, mode->mode_id);
+ output_funcs = output->helper_private;
+ output_funcs->mode_set(output, mode, adjusted_mode);
+ }
+
+ /* Now, enable the clocks, plane, pipe, and outputs that we set up. */
+ crtc_funcs->commit(crtc);
+
+ list_for_each_entry(output, &dev->mode_config.output_list, head) {
+
+ if (output->crtc != crtc)
+ continue;
+
+ output_funcs = output->helper_private;
+ output_funcs->commit(output);
+
+#if 0 // TODO def RANDR_12_INTERFACE
+ if (output->randr_output)
+ RRPostPendingProperties (output->randr_output);
+#endif
+ }
+
+ /* XXX free adjustedmode */
+ drm_mode_destroy(dev, adjusted_mode);
+ /* TODO */
+// if (scrn->pScreen)
+// drm_crtc_set_screen_sub_pixel_order(dev);
+
+done:
+ if (!ret) {
+ crtc->mode = saved_mode;
+ crtc->x = saved_x;
+ crtc->y = saved_y;
+ }
+
+ return ret;
+}
+EXPORT_SYMBOL(drm_crtc_helper_set_mode);
+
+
+/**
+ * drm_crtc_helper_set_config - set a new config from userspace
+ * @crtc: CRTC to setup
+ * @crtc_info: user provided configuration
+ * @new_mode: new mode to set
+ * @output_set: set of outputs for the new config
+ * @fb: new framebuffer
+ *
+ * LOCKING:
+ * Caller must hold mode config lock.
+ *
+ * Setup a new configuration, provided by the user in @crtc_info, and enable
+ * it.
+ *
+ * RETURNS:
+ * Zero. (FIXME)
+ */
+int drm_crtc_helper_set_config(struct drm_mode_set *set)
+{
+ struct drm_device *dev;
+ struct drm_crtc **save_crtcs, *new_crtc;
+ bool save_enabled;
+ bool changed = false;
+ bool flip_or_move = false;
+ struct drm_output *output;
+ int count = 0, ro;
+ struct drm_crtc_helper_funcs *crtc_funcs;
+
+ DRM_DEBUG("\n");
+
+ if (!set)
+ return -EINVAL;
+
+ if (!set->crtc)
+ return -EINVAL;
+
+ if (!set->crtc->helper_private)
+ return -EINVAL;
+
+ crtc_funcs = set->crtc->helper_private;
+
+ DRM_DEBUG("crtc: %p fb: %p outputs: %p num_outputs: %i (x, y) (%i, %i)\n", set->crtc, set->fb, set->outputs, set->num_outputs, set->x, set->y);
+ dev = set->crtc->dev;
+
+ /* save previous config */
+ save_enabled = set->crtc->enabled;
+
+ /* this is meant to be num_output not num_crtc */
+ save_crtcs = kzalloc(dev->mode_config.num_output * sizeof(struct drm_crtc *), GFP_KERNEL);
+ if (!save_crtcs)
+ return -ENOMEM;
+
+ /* 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)
+ flip_or_move = true;
+
+ if (set->x != set->crtc->x || set->y != set->crtc->y)
+ flip_or_move = true;
+
+ if (set->mode && !drm_mode_equal(set->mode, &set->crtc->mode)) {
+ DRM_DEBUG("modes are different\n");
+ drm_mode_debug_printmodeline(&set->crtc->mode);
+ drm_mode_debug_printmodeline(set->mode);
+ changed = true;
+ }
+
+ list_for_each_entry(output, &dev->mode_config.output_list, head) {
+ save_crtcs[count++] = output->crtc;
+
+ if (output->crtc == set->crtc)
+ new_crtc = NULL;
+ else
+ new_crtc = output->crtc;
+
+ for (ro = 0; ro < set->num_outputs; ro++) {
+ if (set->outputs[ro] == output)
+ new_crtc = set->crtc;
+ }
+ if (new_crtc != output->crtc) {
+ changed = true;
+ output->crtc = new_crtc;
+ }
+ }
+
+ /* mode_set_base is not a required function */
+ if (flip_or_move && !crtc_funcs->mode_set_base)
+ changed = true;
+
+ if (changed) {
+ set->crtc->fb = set->fb;
+ set->crtc->enabled = (set->mode != NULL);
+ if (set->mode != NULL) {
+ DRM_DEBUG("attempting to set mode from userspace\n");
+ drm_mode_debug_printmodeline(set->mode);
+ if (!drm_crtc_helper_set_mode(set->crtc, set->mode, set->x,
+ set->y)) {
+ set->crtc->enabled = save_enabled;
+ count = 0;
+ list_for_each_entry(output, &dev->mode_config.output_list, head)
+ output->crtc = save_crtcs[count++];
+ kfree(save_crtcs);
+ return -EINVAL;
+ }
+ /* TODO are these needed? */
+ set->crtc->desired_x = set->x;
+ set->crtc->desired_y = set->y;
+ set->crtc->desired_mode = set->mode;
+ }
+ drm_disable_unused_functions(dev);
+ } else if (flip_or_move) {
+ if (set->crtc->fb != set->fb)
+ set->crtc->fb = set->fb;
+ crtc_funcs->mode_set_base(set->crtc, set->x, set->y);
+ }
+
+ kfree(save_crtcs);
+ return 0;
+}
+EXPORT_SYMBOL(drm_crtc_helper_set_config);
+
+/**
+ * drm_initial_config - setup a sane initial output configuration
+ * @dev: DRM device
+ * @can_grow: this configuration is growable
+ *
+ * LOCKING:
+ * Called at init time, must take mode config lock.
+ *
+ * Scan the CRTCs and outputs and try to put together an initial setup.
+ * At the moment, this is a cloned configuration across all heads with
+ * a new framebuffer object as the backing store.
+ *
+ * RETURNS:
+ * Zero if everything went ok, nonzero otherwise.
+ */
+bool drm_helper_initial_config(struct drm_device *dev, bool can_grow)
+{
+ struct drm_output *output;
+ int ret = false;
+
+ mutex_lock(&dev->mode_config.mutex);
+
+ drm_crtc_probe_output_modes(dev, 2048, 2048);
+
+ drm_pick_crtcs(dev);
+
+ /* This is a little screwy, as we've already walked the outputs
+ * above, but it's a little bit of magic too. There's the potential
+ * for things not to get setup above if an existing device gets
+ * re-assigned thus confusing the hardware. By walking the outputs
+ * this fixes up their crtc's.
+ */
+ list_for_each_entry(output, &dev->mode_config.output_list, head) {
+
+ /* can't setup the output if there's no assigned mode */
+ if (!output->crtc || !output->crtc->desired_mode)
+ continue;
+
+ dev->driver->fb_probe(dev, output->crtc, output);
+
+ /* and needs an attached fb */
+ if (output->crtc->fb)
+ drm_crtc_helper_set_mode(output->crtc, output->crtc->desired_mode, 0, 0);
+ }
+
+ drm_disable_unused_functions(dev);
+
+ mutex_unlock(&dev->mode_config.mutex);
+ return ret;
+}
+EXPORT_SYMBOL(drm_helper_initial_config);
+
+/**
+ * drm_hotplug_stage_two
+ * @dev DRM device
+ * @output hotpluged output
+ *
+ * LOCKING.
+ * Caller must hold mode config lock, function might grab struct lock.
+ *
+ * Stage two of a hotplug.
+ *
+ * RETURNS:
+ * Zero on success, errno on failure.
+ */
+int drm_helper_hotplug_stage_two(struct drm_device *dev, struct drm_output *output,
+ bool connected)
+{
+ int has_config = 0;
+
+ dev->mode_config.hotplug_counter++;
+
+ /* We might want to do something more here */
+ if (!connected) {
+ DRM_DEBUG("not connected\n");
+ return 0;
+ }
+
+ if (output->crtc && output->crtc->desired_mode) {
+ DRM_DEBUG("drm thinks that the output already has a config\n");
+ has_config = 1;
+ }
+
+ drm_crtc_probe_output_modes(dev, 2048, 2048);
+
+ if (!has_config)
+ drm_pick_crtcs(dev);
+
+ if (!output->crtc || !output->crtc->desired_mode) {
+ DRM_DEBUG("could not find a desired mode or crtc for output\n");
+ return 1;
+ }
+
+ /* We should really check if there is a fb using this crtc */
+ if (!has_config)
+ dev->driver->fb_probe(dev, output->crtc, output);
+ else {
+ dev->driver->fb_resize(dev, output->crtc);
+
+#if 0
+ if (!drm_crtc_set_mode(output->crtc, output->crtc->desired_mode, 0, 0))
+ DRM_ERROR("failed to set mode after hotplug\n");
+#endif
+ }
+
+ drm_sysfs_hotplug_event(dev);
+
+ drm_disable_unused_functions(dev);
+
+ return 0;
+}
+EXPORT_SYMBOL(drm_helper_hotplug_stage_two);
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