/*
* Copyright (c) 2006-2008 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 <linux/export.h>
#include <linux/moduleparam.h>
#include <drm/drmP.h>
#include <drm/drm_crtc.h>
#include <drm/drm_fourcc.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_fb_helper.h>
#include <drm/drm_edid.h>
/**
* drm_helper_move_panel_connectors_to_head() - move panels to the front in the
* connector list
* @dev: drm device to operate on
*
* Some userspace presumes that the first connected connector is the main
* display, where it's supposed to display e.g. the login screen. For
* laptops, this should be the main panel. Use this function to sort all
* (eDP/LVDS) panels to the front of the connector list, instead of
* painstakingly trying to initialize them in the right order.
*/
void drm_helper_move_panel_connectors_to_head(struct drm_device *dev)
{
struct drm_connector *connector, *tmp;
struct list_head panel_list;
INIT_LIST_HEAD(&panel_list);
list_for_each_entry_safe(connector, tmp,
&dev->mode_config.connector_list, head) {
if (connector->connector_type == DRM_MODE_CONNECTOR_LVDS ||
connector->connector_type == DRM_MODE_CONNECTOR_eDP)
list_move_tail(&connector->head, &panel_list);
}
list_splice(&panel_list, &dev->mode_config.connector_list);
}
EXPORT_SYMBOL(drm_helper_move_panel_connectors_to_head);
static bool drm_kms_helper_poll = true;
static void drm_mode_validate_flag(struct drm_connector *connector,
int flags)
{
struct drm_display_mode *mode;
if (flags == (DRM_MODE_FLAG_DBLSCAN | DRM_MODE_FLAG_INTERLACE))
return;
list_for_each_entry(mode, &connector->modes, head) {
if ((mode->flags & DRM_MODE_FLAG_INTERLACE) &&
!(flags & DRM_MODE_FLAG_INTERLACE))
mode->status = MODE_NO_INTERLACE;
if ((mode->flags & DRM_MODE_FLAG_DBLSCAN) &&
!(flags & DRM_MODE_FLAG_DBLSCAN))
mode->status = MODE_NO_DBLESCAN;
}
return;
}
/**
* drm_helper_probe_single_connector_modes - get complete set of display modes
* @connector: connector to probe
* @maxX: max width for modes
* @maxY: max height for modes
*
* LOCKING:
* Caller must hold mode config lock.
*
* Based on the helper callbacks implemented by @connector try to detect all
* valid modes. 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 use as a generic implementation of the ->probe() @connector
* callback for drivers that use the crtc helpers for output mode filtering and
* detection.
*
* RETURNS:
* Number of modes found on @connector.
*/
int 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;
struct drm_connector_helper_funcs *connector_funcs =
connector->helper_private;
int count = 0;
int mode_flags = 0;
DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n", connector->base.id,
drm_get_connector_name(connector));
/* set all modes to the unverified state */
list_for_each_entry(mode, &connector->modes, head)
mode->status = MODE_UNVERIFIED;
if (connector->force) {
if (connector->force == DRM_FORCE_ON)
connector->status = connector_status_connected;
else
connector->status = connector_status_disconnected;
if (connector->funcs->force)
connector->funcs->force(connector);
} else {
connector->status = connector->funcs->detect(connector, true);
// drm_kms_helper_poll_enable(dev);
}
if (connector->status == connector_status_disconnected) {
DRM_DEBUG_KMS("[CONNECTOR:%d:%s] disconnected\n",
connector->base.id, drm_get_connector_name(connector));
drm_mode_connector_update_edid_property(connector, NULL);
goto prune;
}
#ifdef CONFIG_DRM_LOAD_EDID_FIRMWARE
count = drm_load_edid_firmware(connector);
if (count == 0)
#endif
count = (*connector_funcs->get_modes)(connector);
if (count == 0 && connector->status == connector_status_connected)
count = drm_add_modes_noedid(connector, 1024, 768);
if (count == 0)
goto prune;
drm_mode_connector_list_update(connector);
if (maxX && maxY)
drm_mode_validate_size(dev, &connector->modes, maxX,
maxY, 0);
if (connector->interlace_allowed)
mode_flags |= DRM_MODE_FLAG_INTERLACE;
if (connector->doublescan_allowed)
mode_flags |= DRM_MODE_FLAG_DBLSCAN;
drm_mode_validate_flag(connector, mode_flags);
list_for_each_entry(mode, &connector->modes, head) {
if (mode->status == MODE_OK)
mode->status = connector_funcs->mode_valid(connector,
mode);
}
prune:
drm_mode_prune_invalid(dev, &connector->modes, true);
if (list_empty(&connector->modes))
return 0;
drm_mode_sort(&connector->modes);
DRM_DEBUG_KMS("[CONNECTOR:%d:%s] probed modes :\n", connector->base.id,
drm_get_connector_name(connector));
list_for_each_entry(mode, &connector->modes, head) {
mode->vrefresh = drm_mode_vrefresh(mode);
drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
drm_mode_debug_printmodeline(mode);
}
return count;
}
EXPORT_SYMBOL(drm_helper_probe_single_connector_modes);
/**
* drm_helper_encoder_in_use - check if a given encoder is in use
* @encoder: encoder to check
*
* LOCKING:
* Caller must hold mode config lock.
*
* Walk @encoders's DRM device's mode_config and see if it's in use.
*
* RETURNS:
* True if @encoder is part of the mode_config, false otherwise.
*/
bool drm_helper_encoder_in_use(struct drm_encoder *encoder)
{
struct drm_connector *connector;
struct drm_device *dev = encoder->dev;
list_for_each_entry(connector, &dev->mode_config.connector_list, head)
if (connector->encoder == encoder)
return true;
return false;
}
EXPORT_SYMBOL(drm_helper_encoder_in_use);
/**
* 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 && drm_helper_encoder_in_use(encoder))
return true;
return false;
}
EXPORT_SYMBOL(drm_helper_crtc_in_use);
static void
drm_encoder_disable(struct drm_encoder *encoder)
{
struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
if (encoder_funcs->disable)
(*encoder_funcs->disable)(encoder);
else
(*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
}
/**
* drm_helper_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_connector *connector;
struct drm_crtc *crtc;
list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
if (!connector->encoder)
continue;
if (connector->status == connector_status_disconnected)
connector->encoder = NULL;
}
list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
if (!drm_helper_encoder_in_use(encoder)) {
drm_encoder_disable(encoder);
/* disconnector encoder from any connector */
encoder->crtc = NULL;
}
}
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) {
if (crtc_funcs->disable)
(*crtc_funcs->disable)(crtc);
else
(*crtc_funcs->dpms)(crtc, DRM_MODE_DPMS_OFF);
crtc->fb = NULL;
}
}
}
EXPORT_SYMBOL(drm_helper_disable_unused_functions);
/**
* drm_encoder_crtc_ok - can a given crtc drive a given encoder?
* @encoder: encoder to test
* @crtc: crtc to test
*
* Return false if @encoder can't be driven by @crtc, true otherwise.
*/
static bool drm_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;
}
/*
* Check the CRTC we're going to map each output to vs. its current
* CRTC. If they don't match, we have to disable the output and the CRTC
* since the driver will have to re-route things.
*/
static void
drm_crtc_prepare_encoders(struct drm_device *dev)
{
struct drm_encoder_helper_funcs *encoder_funcs;
struct drm_encoder *encoder;
list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
encoder_funcs = encoder->helper_private;
/* Disable unused encoders */
if (encoder->crtc == NULL)
drm_encoder_disable(encoder);
/* Disable encoders whose CRTC is about to change */
if (encoder_funcs->get_crtc &&
encoder->crtc != (*encoder_funcs->get_crtc)(encoder))
drm_encoder_disable(encoder);
}
}
/**
* drm_crtc_helper_set_mode - internal helper to set a mode
* @crtc: CRTC to program
* @mode: mode to use
* @x: horizontal offset into the surface
* @y: vertical offset into the surface
* @old_fb: old framebuffer, for cleanup
*
* 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. This is an internal
* helper that drivers could e.g. use to update properties that require the
* entire output pipe to be disabled and re-enabled in a new configuration. For
* example for changing whether audio is enabled on a hdmi link or for changing
* panel fitter or dither attributes. It is also called by the
* drm_crtc_helper_set_config() helper function to drive the mode setting
* sequence.
*
* 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_framebuffer *old_fb)
{
struct drm_device *dev = crtc->dev;
struct drm_display_mode *adjusted_mode, saved_mode, saved_hwmode;
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;
crtc->enabled = drm_helper_crtc_in_use(crtc);
if (!crtc->enabled)
return true;
adjusted_mode = drm_mode_duplicate(dev, mode);
if (!adjusted_mode)
return false;
saved_hwmode = crtc->hwmode;
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;
/* 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))) {
DRM_DEBUG_KMS("Encoder fixup failed\n");
goto done;
}
}
if (!(ret = crtc_funcs->mode_fixup(crtc, mode, adjusted_mode))) {
DRM_DEBUG_KMS("CRTC fixup failed\n");
goto done;
}
DRM_DEBUG_KMS("[CRTC:%d]\n", crtc->base.id);
/* 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);
}
drm_crtc_prepare_encoders(dev);
crtc_funcs->prepare(crtc);
/* Set up the DPLL and any encoders state that needs to adjust or depend
* on the DPLL.
*/
ret = !crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y, old_fb);
if (!ret)
goto done;
list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
if (encoder->crtc != crtc)
continue;
DRM_DEBUG_KMS("[ENCODER:%d:%s] set [MODE:%d:%s]\n",
encoder->base.id, drm_get_encoder_name(encoder),
mode->base.id, mode->name);
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);
}
/* Store real post-adjustment hardware mode. */
crtc->hwmode = *adjusted_mode;
/* Calculate and store various constants which
* are later needed by vblank and swap-completion
* timestamping. They are derived from true hwmode.
*/
drm_calc_timestamping_constants(crtc);
/* FIXME: add subpixel order */
done:
drm_mode_destroy(dev, adjusted_mode);
if (!ret) {
crtc->hwmode = saved_hwmode;
crtc->mode = saved_mode;
crtc->x = saved_x;
crtc->y = saved_y;
}
return ret;
}
EXPORT_SYMBOL(drm_crtc_helper_set_mode);
static int
drm_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;
}
/**
* drm_crtc_helper_set_config - set a new config from userspace
* @set: mode set configuration
*
* LOCKING:
* Caller must hold mode config lock.
*
* Setup a new configuration, provided by the upper layers (either an ioctl call
* from userspace or internally e.g. from the fbdev suppport code) in @set, and
* enable it. This is the main helper functions for drivers that implement
* kernel mode setting with the crtc helper functions and the assorted
* ->prepare(), ->modeset() and ->commit() helper callbacks.
*
* RETURNS:
* Returns 0 on success, -ERRNO on failure.
*/
int drm_crtc_helper_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 drm_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 &&
!drm_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;
}
EXPORT_SYMBOL(drm_crtc_helper_set_config);
static int drm_helper_choose_encoder_dpms(struct drm_encoder *encoder)
{
int dpms = DRM_MODE_DPMS_OFF;
struct drm_connector *connector;
struct drm_device *dev = encoder->dev;
list_for_each_entry(connector, &dev->mode_config.connector_list, head)
if (connector->encoder == encoder)
if (connector->dpms < dpms)
dpms = connector->dpms;
return dpms;
}
static int drm_helper_choose_crtc_dpms(struct drm_crtc *crtc)
{
int dpms = DRM_MODE_DPMS_OFF;
struct drm_connector *connector;
struct drm_device *dev = crtc->dev;
list_for_each_entry(connector, &dev->mode_config.connector_list, head)
if (connector->encoder && connector->encoder->crtc == crtc)
if (connector->dpms < dpms)
dpms = connector->dpms;
return dpms;
}
/**
* drm_helper_connector_dpms() - connector dpms helper implementation
* @connector: affected connector
* @mode: DPMS mode
*
* This is the main helper function provided by the crtc helper framework for
* implementing the DPMS connector attribute. It computes the new desired DPMS
* state for all encoders and crtcs in the output mesh and calls the ->dpms()
* callback provided by the driver appropriately.
*/
void drm_helper_connector_dpms(struct drm_connector *connector, int mode)
{
struct drm_encoder *encoder = connector->encoder;
struct drm_crtc *crtc = encoder ? encoder->crtc : NULL;
int old_dpms;
if (mode == connector->dpms)
return;
old_dpms = connector->dpms;
connector->dpms = mode;
/* from off to on, do crtc then encoder */
if (mode < old_dpms) {
if (crtc) {
struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
if (crtc_funcs->dpms)
(*crtc_funcs->dpms) (crtc,
drm_helper_choose_crtc_dpms(crtc));
}
if (encoder) {
struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
if (encoder_funcs->dpms)
(*encoder_funcs->dpms) (encoder,
drm_helper_choose_encoder_dpms(encoder));
}
}
/* from on to off, do encoder then crtc */
if (mode > old_dpms) {
if (encoder) {
struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
if (encoder_funcs->dpms)
(*encoder_funcs->dpms) (encoder,
drm_helper_choose_encoder_dpms(encoder));
}
if (crtc) {
struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
if (crtc_funcs->dpms)
(*crtc_funcs->dpms) (crtc,
drm_helper_choose_crtc_dpms(crtc));
}
}
return;
}
EXPORT_SYMBOL(drm_helper_connector_dpms);
int drm_helper_mode_fill_fb_struct(struct drm_framebuffer *fb,
struct drm_mode_fb_cmd2 *mode_cmd)
{
int i;
fb->width = mode_cmd->width;
fb->height = mode_cmd->height;
for (i = 0; i < 4; i++) {
fb->pitches[i] = mode_cmd->pitches[i];
fb->offsets[i] = mode_cmd->offsets[i];
}
drm_fb_get_bpp_depth(mode_cmd->pixel_format, &fb->depth,
&fb->bits_per_pixel);
fb->pixel_format = mode_cmd->pixel_format;
return 0;
}
EXPORT_SYMBOL(drm_helper_mode_fill_fb_struct);
int drm_helper_resume_force_mode(struct drm_device *dev)
{
struct drm_crtc *crtc;
struct drm_encoder *encoder;
struct drm_encoder_helper_funcs *encoder_funcs;
struct drm_crtc_helper_funcs *crtc_funcs;
int ret;
list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
if (!crtc->enabled)
continue;
ret = drm_crtc_helper_set_mode(crtc, &crtc->mode,
crtc->x, crtc->y, crtc->fb);
if (ret == false)
DRM_ERROR("failed to set mode on crtc %p\n", crtc);
/* Turn off outputs that were already powered off */
if (drm_helper_choose_crtc_dpms(crtc)) {
list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
if(encoder->crtc != crtc)
continue;
encoder_funcs = encoder->helper_private;
if (encoder_funcs->dpms)
(*encoder_funcs->dpms) (encoder,
drm_helper_choose_encoder_dpms(encoder));
}
crtc_funcs = crtc->helper_private;
if (crtc_funcs->dpms)
(*crtc_funcs->dpms) (crtc,
drm_helper_choose_crtc_dpms(crtc));
}
}
/* disable the unused connectors while restoring the modesetting */
drm_helper_disable_unused_functions(dev);
return 0;
}
EXPORT_SYMBOL(drm_helper_resume_force_mode);
#if 0
#define DRM_OUTPUT_POLL_PERIOD (10*HZ)
static void output_poll_execute(struct work_struct *work)
{
struct delayed_work *delayed_work = to_delayed_work(work);
struct drm_device *dev = container_of(delayed_work, struct drm_device, mode_config.output_poll_work);
struct drm_connector *connector;
enum drm_connector_status old_status;
bool repoll = false, changed = false;
if (!drm_kms_helper_poll)
return;
mutex_lock(&dev->mode_config.mutex);
list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
/* Ignore forced connectors. */
if (connector->force)
continue;
/* Ignore HPD capable connectors and connectors where we don't
* want any hotplug detection at all for polling. */
if (!connector->polled || connector->polled == DRM_CONNECTOR_POLL_HPD)
continue;
repoll = true;
old_status = connector->status;
/* if we are connected and don't want to poll for disconnect
skip it */
if (old_status == connector_status_connected &&
!(connector->polled & DRM_CONNECTOR_POLL_DISCONNECT))
continue;
connector->status = connector->funcs->detect(connector, false);
DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %d to %d\n",
connector->base.id,
drm_get_connector_name(connector),
old_status, connector->status);
if (old_status != connector->status)
changed = true;
}
mutex_unlock(&dev->mode_config.mutex);
if (changed)
drm_kms_helper_hotplug_event(dev);
if (repoll)
schedule_delayed_work(delayed_work, DRM_OUTPUT_POLL_PERIOD);
}
void drm_kms_helper_poll_disable(struct drm_device *dev)
{
if (!dev->mode_config.poll_enabled)
return;
cancel_delayed_work_sync(&dev->mode_config.output_poll_work);
}
EXPORT_SYMBOL(drm_kms_helper_poll_disable);
void drm_kms_helper_poll_enable(struct drm_device *dev)
{
bool poll = false;
struct drm_connector *connector;
if (!dev->mode_config.poll_enabled || !drm_kms_helper_poll)
return;
list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
if (connector->polled & (DRM_CONNECTOR_POLL_CONNECT |
DRM_CONNECTOR_POLL_DISCONNECT))
poll = true;
}
if (poll)
schedule_delayed_work(&dev->mode_config.output_poll_work, DRM_OUTPUT_POLL_PERIOD);
}
EXPORT_SYMBOL(drm_kms_helper_poll_enable);
void drm_kms_helper_poll_init(struct drm_device *dev)
{
INIT_DELAYED_WORK(&dev->mode_config.output_poll_work, output_poll_execute);
dev->mode_config.poll_enabled = true;
drm_kms_helper_poll_enable(dev);
}
EXPORT_SYMBOL(drm_kms_helper_poll_init);
void drm_kms_helper_poll_fini(struct drm_device *dev)
{
drm_kms_helper_poll_disable(dev);
}
EXPORT_SYMBOL(drm_kms_helper_poll_fini);
void drm_helper_hpd_irq_event(struct drm_device *dev)
{
struct drm_connector *connector;
enum drm_connector_status old_status;
bool changed = false;
if (!dev->mode_config.poll_enabled)
return;
mutex_lock(&dev->mode_config.mutex);
list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
/* Only handle HPD capable connectors. */
if (!(connector->polled & DRM_CONNECTOR_POLL_HPD))
continue;
old_status = connector->status;
connector->status = connector->funcs->detect(connector, false);
DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %d to %d\n",
connector->base.id,
drm_get_connector_name(connector),
old_status, connector->status);
if (old_status != connector->status)
changed = true;
}
mutex_unlock(&dev->mode_config.mutex);
if (changed)
drm_kms_helper_hotplug_event(dev);
}
EXPORT_SYMBOL(drm_helper_hpd_irq_event);
#endif