drm/linux-core/drm_crtc_helper.c

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/* (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"
/*
* Detailed mode info for a standard 640x480@60Hz monitor
*/
static struct drm_display_mode std_mode[] = {
{ DRM_MODE("640x480", DRM_MODE_TYPE_DEFAULT, 25200, 640, 656,
752, 800, 0, 480, 490, 492, 525, 0,
V_NHSYNC | V_NVSYNC) }, /* 640x480@60Hz */
};
/**
* drm_helper_probe_connector_modes - get complete set of display modes
* @dev: DRM device
* @maxX: max width for modes
* @maxY: max height for modes
*
* LOCKING:
* Caller must hold mode config lock.
*
* Based on @dev's mode_config layout, scan all the connectors and try to detect
* modes on them. Modes will first be added to the connector's probed_modes
* list, then culled (based on validity and the @maxX, @maxY parameters) and
* put into the normal modes list.
*
* Intended to be used either at bootup time or when major configuration
* changes have occurred.
*
* FIXME: take into account monitor limits
*/
void drm_helper_probe_single_connector_modes(struct drm_connector *connector, uint32_t maxX, uint32_t maxY)
{
struct drm_device *dev = connector->dev;
struct drm_display_mode *mode, *t;
struct drm_connector_helper_funcs *connector_funcs = connector->helper_private;
int ret;
DRM_DEBUG("%s\n", drm_get_connector_name(connector));
/* set all modes to the unverified state */
list_for_each_entry_safe(mode, t, &connector->modes, head)
mode->status = MODE_UNVERIFIED;
connector->status = (*connector->funcs->detect)(connector);
if (connector->status == connector_status_disconnected) {
DRM_DEBUG("%s is disconnected\n", drm_get_connector_name(connector));
/* TODO set EDID to NULL */
return;
}
ret = (*connector_funcs->get_modes)(connector);
if (ret) {
drm_mode_connector_list_update(connector);
}
if (maxX && maxY)
drm_mode_validate_size(dev, &connector->modes, maxX,
maxY, 0);
list_for_each_entry_safe(mode, t, &connector->modes, head) {
if (mode->status == MODE_OK)
mode->status = (*connector_funcs->mode_valid)(connector,mode);
}
drm_mode_prune_invalid(dev, &connector->modes, TRUE);
if (list_empty(&connector->modes)) {
struct drm_display_mode *stdmode;
DRM_DEBUG("No valid modes on %s\n", drm_get_connector_name(connector));
/* Should we do this here ???
* When no valid EDID modes are available we end up
* here and bailed in the past, now we add a standard
* 640x480@60Hz mode and carry on.
*/
stdmode = drm_mode_duplicate(dev, &std_mode[0]);
drm_mode_probed_add(connector, stdmode);
drm_mode_list_concat(&connector->probed_modes,
&connector->modes);
DRM_DEBUG("Adding standard 640x480 @ 60Hz to %s\n",
drm_get_connector_name(connector));
}
drm_mode_sort(&connector->modes);
DRM_DEBUG("Probed modes for %s\n", drm_get_connector_name(connector));
list_for_each_entry_safe(mode, t, &connector->modes, head) {
mode->vrefresh = drm_mode_vrefresh(mode);
drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
drm_mode_debug_printmodeline(mode);
}
}
EXPORT_SYMBOL(drm_helper_probe_single_connector_modes);
void drm_helper_probe_connector_modes(struct drm_device *dev, uint32_t maxX, uint32_t maxY)
{
struct drm_connector *connector;
list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
drm_helper_probe_single_connector_modes(connector, maxX, maxY);
}
}
EXPORT_SYMBOL(drm_helper_probe_connector_modes);
/**
* drm_helper_crtc_in_use - check if a given CRTC is in a mode_config
* @crtc: CRTC to check
*
* LOCKING:
* Caller must hold mode config lock.
*
* Walk @crtc's DRM device's mode_config and see if it's in use.
*
* RETURNS:
* True if @crtc is part of the mode_config, false otherwise.
*/
bool drm_helper_crtc_in_use(struct drm_crtc *crtc)
{
struct drm_encoder *encoder;
struct drm_device *dev = crtc->dev;
/* FIXME: Locking around list access? */
list_for_each_entry(encoder, &dev->mode_config.encoder_list, head)
if (encoder->crtc == crtc)
return true;
return false;
}
EXPORT_SYMBOL(drm_helper_crtc_in_use);
/**
* drm_disable_unused_functions - disable unused objects
* @dev: DRM device
*
* LOCKING:
* Caller must hold mode config lock.
*
* If an connector or CRTC isn't part of @dev's mode_config, it can be disabled
* by calling its dpms function, which should power it off.
*/
void drm_helper_disable_unused_functions(struct drm_device *dev)
{
struct drm_encoder *encoder;
struct drm_encoder_helper_funcs *encoder_funcs;
struct drm_crtc *crtc;
list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
encoder_funcs = encoder->helper_private;
if (!encoder->crtc)
(*encoder_funcs->dpms)(encoder, DPMSModeOff);
}
list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
crtc->enabled = drm_helper_crtc_in_use(crtc);
if (!crtc->enabled) {
crtc_funcs->dpms(crtc, DPMSModeOff);
crtc->fb = NULL;
}
}
}
EXPORT_SYMBOL(drm_helper_disable_unused_functions);
/**
* drm_pick_crtcs - pick crtcs for connector 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_connector *connector, *connector_equal;
struct drm_encoder *encoder, *encoder_equal;
struct drm_crtc *crtc;
struct drm_display_mode *des_mode = NULL, *modes, *modes_equal;
struct drm_connector_helper_funcs *connector_funcs;
int found;
DRM_DEBUG("\n");
/* clean out all the encoder/crtc combos */
list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
encoder->crtc = NULL;
}
list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
connector_funcs = connector->helper_private;
connector->encoder = NULL;
/* Don't hook up connectors 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 connectors now, then we only create
* /dev/fbX for the connector that's enabled, that's good as
* the users console will be on that connector.
*
* If we do hook up connectors 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 connector. Ugh.
*/
if (connector->status != connector_status_connected)
continue;
if (list_empty(&connector->modes))
continue;
des_mode = NULL;
found = 0;
list_for_each_entry(des_mode, &connector->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, &connector->modes, head) {
break;
}
}
encoder = connector_funcs->best_encoder(connector);
if (!encoder)
continue;
connector->encoder = encoder;
c = -1;
list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
assigned = 0;
c++;
if ((encoder->possible_crtcs & (1 << c)) == 0)
continue;
list_for_each_entry(encoder_equal, &dev->mode_config.encoder_list, head) {
if (encoder->base.id == encoder_equal->base.id)
continue;
/* Find out if crtc has been assigned before */
if (encoder_equal->crtc == crtc)
assigned = 1;
}
#if 1 /* continue for now */
if (assigned)
continue;
#endif
o = -1;
list_for_each_entry(connector_equal, &dev->mode_config.connector_list, head) {
o++;
if (connector->base.id == connector_equal->base.id)
continue;
encoder_equal = connector_equal->encoder;
if (!encoder_equal)
continue;
list_for_each_entry(modes, &connector->modes, head) {
list_for_each_entry(modes_equal, &connector_equal->modes, head) {
if (drm_mode_equal (modes, modes_equal)) {
if ((encoder->possible_clones & encoder_equal->possible_clones) && (connector_equal->encoder->crtc == crtc)) {
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printk("Cloning %s (0x%x) to %s (0x%x)\n",drm_get_connector_name(connector),encoder->possible_clones,drm_get_connector_name(connector_equal),encoder_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 ! */
encoder->crtc = crtc;
encoder->crtc->desired_mode = des_mode;
connector->initial_x = 0;
connector->initial_y = 0;
DRM_DEBUG("Desired mode for CRTC %d is 0x%x:%s\n",c,des_mode->base.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 connectors 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_encoder_helper_funcs *encoder_funcs;
int saved_x, saved_y;
struct drm_encoder *encoder;
bool ret = true;
adjusted_mode = drm_mode_duplicate(dev, mode);
crtc->enabled = drm_helper_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 connectors and the CRTC to give them a chance to
* adjust it according to limitations or connector properties, and also
* a chance to reject the mode entirely.
*/
list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
if (encoder->crtc != crtc)
continue;
encoder_funcs = encoder->helper_private;
if (!(ret = encoder_funcs->mode_fixup(encoder, mode, adjusted_mode))) {
goto done;
}
}
if (!(ret = crtc_funcs->mode_fixup(crtc, mode, adjusted_mode))) {
goto done;
}
/* Prepare the encoders and CRTCs before setting the mode. */
list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
if (encoder->crtc != crtc)
continue;
encoder_funcs = encoder->helper_private;
/* Disable the encoders as the first thing we do. */
encoder_funcs->prepare(encoder);
}
crtc_funcs->prepare(crtc);
/* Set up the DPLL and any encoders state that needs to adjust or depend
* on the DPLL.
*/
crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y);
list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
if (encoder->crtc != crtc)
continue;
DRM_INFO("%s: set mode %s %x\n", drm_get_encoder_name(encoder), mode->name, mode->base.id);
encoder_funcs = encoder->helper_private;
encoder_funcs->mode_set(encoder, mode, adjusted_mode);
}
/* Now, enable the clocks, plane, pipe, and connectors that we set up. */
crtc_funcs->commit(crtc);
list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
if (encoder->crtc != crtc)
continue;
encoder_funcs = encoder->helper_private;
encoder_funcs->commit(encoder);
}
/* 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
* @connector_set: set of connectors 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;
struct drm_encoder **save_encoders, *new_encoder;
bool save_enabled;
bool changed = false;
bool flip_or_move = false;
struct drm_connector *connector;
int count = 0, ro, fail = 0;
struct drm_crtc_helper_funcs *crtc_funcs;
int ret = 0;
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 connectors: %p num_connectors: %i (x, y) (%i, %i)\n", set->crtc, set->fb, set->connectors, set->num_connectors, set->x, set->y);
dev = set->crtc->dev;
/* save previous config */
save_enabled = set->crtc->enabled;
/* this is meant to be num_connector not num_crtc */
save_crtcs = kzalloc(dev->mode_config.num_connector * sizeof(struct drm_crtc *), GFP_KERNEL);
if (!save_crtcs)
return -ENOMEM;
save_encoders = kzalloc(dev->mode_config.num_connector * sizeof(struct drm_encoders *), GFP_KERNEL);
if (!save_encoders) {
kfree(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) {
/* if we have no fb then its a change not a flip */
if (set->crtc->fb == NULL)
changed = true;
else
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;
}
/* 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;
save_encoders[count++] = connector->encoder;
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) {
changed = true;
connector->encoder = new_encoder;
}
}
if (fail) {
ret = -EINVAL;
goto fail_no_encoder;
}
list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
if (!connector->encoder)
continue;
save_crtcs[count++] = connector->encoder->crtc;
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;
}
if (new_crtc != connector->encoder->crtc) {
changed = true;
connector->encoder->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)) {
ret = -EINVAL;
goto fail_set_mode;
}
/* TODO are these needed? */
set->crtc->desired_x = set->x;
set->crtc->desired_y = set->y;
set->crtc->desired_mode = set->mode;
}
drm_helper_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_encoders);
kfree(save_crtcs);
return 0;
fail_set_mode:
set->crtc->enabled = save_enabled;
count = 0;
list_for_each_entry(connector, &dev->mode_config.connector_list, head)
connector->encoder->crtc = save_crtcs[count++];
fail_no_encoder:
kfree(save_crtcs);
count = 0;
list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
connector->encoder = save_encoders[count++];
}
kfree(save_encoders);
return ret;
}
EXPORT_SYMBOL(drm_crtc_helper_set_config);
bool drm_helper_plugged_event(struct drm_device *dev)
{
DRM_DEBUG("\n");
drm_helper_probe_connector_modes(dev, dev->mode_config.max_width, dev->mode_config.max_height);
drm_pick_crtcs(dev);
/* alert the driver fb layer */
dev->mode_config.funcs->fb_changed(dev);
drm_helper_disable_unused_functions(dev);
drm_sysfs_hotplug_event(dev);
return true;
}
/**
* drm_initial_config - setup a sane initial connector configuration
* @dev: DRM device
* @can_grow: this configuration is growable
*
* LOCKING:
* Called at init time, must take mode config lock.
*
* Scan the CRTCs and connectors 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)
{
int ret = false;
drm_helper_plugged_event(dev);
return ret;
}
EXPORT_SYMBOL(drm_helper_initial_config);
/**
* drm_hotplug_stage_two
* @dev DRM device
* @connector hotpluged connector
*
* 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)
{
dev->mode_config.hotplug_counter++;
drm_helper_plugged_event(dev);
return 0;
}
EXPORT_SYMBOL(drm_helper_hotplug_stage_two);
int drm_helper_mode_fill_fb_struct(struct drm_framebuffer *fb,
struct drm_mode_fb_cmd *mode_cmd)
{
fb->width = mode_cmd->width;
fb->height = mode_cmd->height;
fb->pitch = mode_cmd->pitch;
fb->bits_per_pixel = mode_cmd->bpp;
fb->depth = mode_cmd->depth;
fb->mm_handle = mode_cmd->handle;
return 0;
}
EXPORT_SYMBOL(drm_helper_mode_fill_fb_struct);
/**
* drm_get_buffer_object - find the buffer object for a given handle
* @dev: DRM device
* @bo: pointer to caller's buffer_object pointer
* @handle: handle to lookup
*
* LOCKING:
* Must take @dev's struct_mutex to protect buffer object lookup.
*
* Given @handle, lookup the buffer object in @dev and put it in the caller's
* @bo pointer.
*
* RETURNS:
* Zero on success, -EINVAL if the handle couldn't be found.
*/
int drm_get_buffer_object(struct drm_device *dev, struct drm_buffer_object **bo, unsigned long handle)
{
struct drm_user_object *uo;
struct drm_hash_item *hash;
int ret;
*bo = NULL;
mutex_lock(&dev->struct_mutex);
ret = drm_ht_find_item(&dev->object_hash, handle, &hash);
if (ret) {
DRM_ERROR("Couldn't find handle.\n");
ret = -EINVAL;
goto out_err;
}
uo = drm_hash_entry(hash, struct drm_user_object, hash);
if (uo->type != drm_buffer_type) {
ret = -EINVAL;
goto out_err;
}
*bo = drm_user_object_entry(uo, struct drm_buffer_object, base);
ret = 0;
out_err:
mutex_unlock(&dev->struct_mutex);
return ret;
}
EXPORT_SYMBOL(drm_get_buffer_object);
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