/*
* Copyright (c) 2006-2008 Intel Corporation
* Copyright (c) 2007 Dave Airlie <[email protected]>
*
* 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 <[email protected]>
* Dave Airlie <[email protected]>
* Jesse Barnes <[email protected]>
*/
#include <linux/export.h>
#include <linux/kernel.h>
#include <linux/moduleparam.h>
#include <linux/dynamic_debug.h>
#include <drm/drm_atomic.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_atomic_uapi.h>
#include <drm/drm_bridge.h>
#include <drm/drm_crtc.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_drv.h>
#include <drm/drm_edid.h>
#include <drm/drm_encoder.h>
#include <drm/drm_fourcc.h>
#include <drm/drm_framebuffer.h>
#include <drm/drm_print.h>
#include <drm/drm_vblank.h>
#include "drm_crtc_helper_internal.h"
DECLARE_DYNDBG_CLASSMAP(drm_debug_classes, DD_CLASS_TYPE_DISJOINT_BITS, 0,
"DRM_UT_CORE",
"DRM_UT_DRIVER",
"DRM_UT_KMS",
"DRM_UT_PRIME",
"DRM_UT_ATOMIC",
"DRM_UT_VBL",
"DRM_UT_STATE",
"DRM_UT_LEASE",
"DRM_UT_DP",
"DRM_UT_DRMRES");
/**
* DOC: overview
*
* The CRTC modeset helper library provides a default set_config implementation
* in drm_crtc_helper_set_config(). Plus a few other convenience functions using
* the same callbacks which drivers can use to e.g. restore the modeset
* configuration on resume with drm_helper_resume_force_mode().
*
* Note that this helper library doesn't track the current power state of CRTCs
* and encoders. It can call callbacks like &drm_encoder_helper_funcs.dpms even
* though the hardware is already in the desired state. This deficiency has been
* fixed in the atomic helpers.
*
* The driver callbacks are mostly compatible with the atomic modeset helpers,
* except for the handling of the primary plane: Atomic helpers require that the
* primary plane is implemented as a real standalone plane and not directly tied
* to the CRTC state. For easier transition this library provides functions to
* implement the old semantics required by the CRTC helpers using the new plane
* and atomic helper callbacks.
*
* Drivers are strongly urged to convert to the atomic helpers (by way of first
* converting to the plane helpers). New drivers must not use these functions
* but need to implement the atomic interface instead, potentially using the
* atomic helpers for that.
*
* These legacy modeset helpers use the same function table structures as
* all other modesetting helpers. See the documentation for struct
* &drm_crtc_helper_funcs, &struct drm_encoder_helper_funcs and struct
* &drm_connector_helper_funcs.
*/
/**
* drm_helper_encoder_in_use - check if a given encoder is in use
* @encoder: encoder to check
*
* Checks whether @encoder is with the current mode setting output configuration
* in use by any connector. This doesn't mean that it is actually enabled since
* the DPMS state is tracked separately.
*
* Returns:
* True if @encoder is used, false otherwise.
*/
bool drm_helper_encoder_in_use(struct drm_encoder *encoder)
{
struct drm_connector *connector;
struct drm_connector_list_iter conn_iter;
struct drm_device *dev = encoder->dev;
drm_WARN_ON(dev, drm_drv_uses_atomic_modeset(dev));
/*
* We can expect this mutex to be locked if we are not panicking.
* Locking is currently fubar in the panic handler.
*/
if (!oops_in_progress) {
drm_WARN_ON(dev, !mutex_is_locked(&dev->mode_config.mutex));
drm_WARN_ON(dev, !drm_modeset_is_locked(&dev->mode_config.connection_mutex));
}
drm_connector_list_iter_begin(dev, &conn_iter);
drm_for_each_connector_iter(connector, &conn_iter) {
if (connector->encoder == encoder) {
drm_connector_list_iter_end(&conn_iter);
return true;
}
}
drm_connector_list_iter_end(&conn_iter);
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
*
* Checks whether @crtc is with the current mode setting output configuration
* in use by any connector. This doesn't mean that it is actually enabled since
* the DPMS state is tracked separately.
*
* Returns:
* True if @crtc is used, false otherwise.
*/
bool drm_helper_crtc_in_use(struct drm_crtc *crtc)
{
struct drm_encoder *encoder;
struct drm_device *dev = crtc->dev;
drm_WARN_ON(dev, drm_drv_uses_atomic_modeset(dev));
/*
* We can expect this mutex to be locked if we are not panicking.
* Locking is currently fubar in the panic handler.
*/
if (!oops_in_progress)
drm_WARN_ON(dev, !mutex_is_locked(&dev->mode_config.mutex));
drm_for_each_encoder(encoder, dev)
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)
{
const struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
if (!encoder_funcs)
return;
if (encoder_funcs->disable)
(*encoder_funcs->disable)(encoder);
else if (encoder_funcs->dpms)
(*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
}
static void __drm_helper_disable_unused_functions(struct drm_device *dev)
{
struct drm_encoder *encoder;
struct drm_crtc *crtc;
drm_warn_on_modeset_not_all_locked(dev);
drm_for_each_encoder(encoder, dev) {
if (!drm_helper_encoder_in_use(encoder)) {
drm_encoder_disable(encoder);
/* disconnect encoder from any connector */
encoder->crtc = NULL;
}
}
drm_for_each_crtc(crtc, dev) {
const 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->primary->fb = NULL;
}
}
}
/**
* drm_helper_disable_unused_functions - disable unused objects
* @dev: DRM device
*
* This function walks through the entire mode setting configuration of @dev. It
* will remove any CRTC links of unused encoders and encoder links of
* disconnected connectors. Then it will disable all unused encoders and CRTCs
* either by calling their disable callback if available or by calling their
* dpms callback with DRM_MODE_DPMS_OFF.
*
* NOTE:
*
* This function is part of the legacy modeset helper library and will cause
* major confusion with atomic drivers. This is because atomic helpers guarantee
* to never call ->disable() hooks on a disabled function, or ->enable() hooks
* on an enabled functions. drm_helper_disable_unused_functions() on the other
* hand throws such guarantees into the wind and calls disable hooks
* unconditionally on unused functions.
*/
void drm_helper_disable_unused_functions(struct drm_device *dev)
{
drm_WARN_ON(dev, drm_drv_uses_atomic_modeset(dev));
drm_modeset_lock_all(dev);
__drm_helper_disable_unused_functions(dev);
drm_modeset_unlock_all(dev);
}
EXPORT_SYMBOL(drm_helper_disable_unused_functions);
/*
* 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)
{
const struct drm_encoder_helper_funcs *encoder_funcs;
struct drm_encoder *encoder;
drm_for_each_encoder(encoder, dev) {
encoder_funcs = encoder->helper_private;
if (!encoder_funcs)
continue;
/* Disable unused encoders */
if (encoder->crtc == NULL)
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
*
* 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, 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;
const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
const struct drm_encoder_helper_funcs *encoder_funcs;
int saved_x, saved_y;
bool saved_enabled;
struct drm_encoder *encoder;
bool ret = true;
drm_WARN_ON(dev, drm_drv_uses_atomic_modeset(dev));
drm_warn_on_modeset_not_all_locked(dev);
saved_enabled = crtc->enabled;
crtc->enabled = drm_helper_crtc_in_use(crtc);
if (!crtc->enabled)
return true;
adjusted_mode = drm_mode_duplicate(dev, mode);
if (!adjusted_mode) {
crtc->enabled = saved_enabled;
return false;
}
drm_mode_init(&saved_mode, &crtc->mode);
drm_mode_init(&saved_hwmode, &crtc->hwmode);
saved_x = crtc->x;
saved_y = crtc->y;
/* Update crtc values up front so the driver can rely on them for mode
* setting.
*/
drm_mode_copy(&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.
*/
drm_for_each_encoder(encoder, dev) {
if (encoder->crtc != crtc)
continue;
encoder_funcs = encoder->helper_private;
if (!encoder_funcs)
continue;
encoder_funcs = encoder->helper_private;
if (encoder_funcs->mode_fixup) {
if (!(ret = encoder_funcs->mode_fixup(encoder, mode,
adjusted_mode))) {
drm_dbg_kms(dev, "[ENCODER:%d:%s] mode fixup failed\n",
encoder->base.id, encoder->name);
goto done;
}
}
}
if (crtc_funcs->mode_fixup) {
if (!(ret = crtc_funcs->mode_fixup(crtc, mode,
adjusted_mode))) {
drm_dbg_kms(dev, "[CRTC:%d:%s] mode fixup failed\n",
crtc->base.id, crtc->name);
goto done;
}
}
drm_dbg_kms(dev, "[CRTC:%d:%s]\n", crtc->base.id, crtc->name);
drm_mode_copy(&crtc->hwmode, adjusted_mode);
/* Prepare the encoders and CRTCs before setting the mode. */
drm_for_each_encoder(encoder, dev) {
if (encoder->crtc != crtc)
continue;
encoder_funcs = encoder->helper_private;
if (!encoder_funcs)
continue;
/* Disable the encoders as the first thing we do. */
if (encoder_funcs->prepare)
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;
drm_for_each_encoder(encoder, dev) {
if (encoder->crtc != crtc)
continue;
encoder_funcs = encoder->helper_private;
if (!encoder_funcs)
continue;
drm_dbg_kms(dev, "[ENCODER:%d:%s] set [MODE:%s]\n",
encoder->base.id, encoder->name, mode->name);
if (encoder_funcs->mode_set)
encoder_funcs->mode_set(encoder, mode, adjusted_mode);
}
/* Now enable the clocks, plane, pipe, and connectors that we set up. */
crtc_funcs->commit(crtc);
drm_for_each_encoder(encoder, dev) {
if (encoder->crtc != crtc)
continue;
encoder_funcs = encoder->helper_private;
if (!encoder_funcs)
continue;
if (encoder_funcs->commit)
encoder_funcs->commit(encoder);
}
/* 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, &crtc->hwmode);
/* FIXME: add subpixel order */
done:
drm_mode_destroy(dev, adjusted_mode);
if (!ret) {
crtc->enabled = saved_enabled;
drm_mode_copy(&crtc->mode, &saved_mode);
drm_mode_copy(&crtc->hwmode, &saved_hwmode);
crtc->x = saved_x;
crtc->y = saved_y;
}
return ret;
}
EXPORT_SYMBOL(drm_crtc_helper_set_mode);
/**
* drm_crtc_helper_atomic_check() - Helper to check CRTC atomic-state
* @crtc: CRTC to check
* @state: atomic state object
*
* Provides a default CRTC-state check handler for CRTCs that only have
* one primary plane attached to it. This is often the case for the CRTC
* of simple framebuffers.
*
* RETURNS:
* Zero on success, or an errno code otherwise.
*/
int drm_crtc_helper_atomic_check(struct drm_crtc *crtc, struct drm_atomic_state *state)
{
struct drm_crtc_state *new_crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
if (!new_crtc_state->enable)
return 0;
return drm_atomic_helper_check_crtc_primary_plane(new_crtc_state);
}
EXPORT_SYMBOL(drm_crtc_helper_atomic_check);
static void
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 */
drm_for_each_encoder(encoder, dev) {
struct drm_connector_list_iter conn_iter;
if (encoder->crtc != crtc)
continue;
drm_connector_list_iter_begin(dev, &conn_iter);
drm_for_each_connector_iter(connector, &conn_iter) {
if (connector->encoder != encoder)
continue;
connector->encoder = NULL;
/*
* drm_helper_disable_unused_functions() ought to be
* doing this, but since we've decoupled the encoder
* from the connector above, the required connection
* between them is henceforth no longer available.
*/
connector->dpms = DRM_MODE_DPMS_OFF;
/* we keep a reference while the encoder is bound */
drm_connector_put(connector);
}
drm_connector_list_iter_end(&conn_iter);
}
__drm_helper_disable_unused_functions(dev);
}
/*
* For connectors that support multiple encoders, either the
* .atomic_best_encoder() or .best_encoder() operation must be implemented.
*/
struct drm_encoder *
drm_connector_get_single_encoder(struct drm_connector *connector)
{
struct drm_encoder *encoder;
drm_WARN_ON(connector->dev, hweight32(connector->possible_encoders) > 1);
drm_connector_for_each_possible_encoder(connector, encoder)
return encoder;
return NULL;
}
/**
* drm_crtc_helper_set_config - set a new config from userspace
* @set: mode set configuration
* @ctx: lock acquire context, not used here
*
* The drm_crtc_helper_set_config() helper function implements the of
* &drm_crtc_funcs.set_config callback for drivers using the legacy CRTC
* helpers.
*
* It first tries to locate the best encoder for each connector by calling the
* connector @drm_connector_helper_funcs.best_encoder helper operation.
*
* After locating the appropriate encoders, the helper function will call the
* mode_fixup encoder and CRTC helper operations to adjust the requested mode,
* or reject it completely in which case an error will be returned to the
* application. If the new configuration after mode adjustment is identical to
* the current configuration the helper function will return without performing
* any other operation.
*
* If the adjusted mode is identical to the current mode but changes to the
* frame buffer need to be applied, the drm_crtc_helper_set_config() function
* will call the CRTC &drm_crtc_helper_funcs.mode_set_base helper operation.
*
* If the adjusted mode differs from the current mode, or if the
* ->mode_set_base() helper operation is not provided, the helper function
* performs a full mode set sequence by calling the ->prepare(), ->mode_set()
* and ->commit() CRTC and encoder helper operations, in that order.
* Alternatively it can also use the dpms and disable helper operations. For
* details see &struct drm_crtc_helper_funcs and struct
* &drm_encoder_helper_funcs.
*
* This function is deprecated. New drivers must implement atomic modeset
* support, for which this function is unsuitable. Instead drivers should use
* drm_atomic_helper_set_config().
*
* Returns:
* Returns 0 on success, negative errno numbers on failure.
*/
int drm_crtc_helper_set_config(struct drm_mode_set *set,
struct drm_modeset_acquire_ctx *ctx)
{
struct drm_device *dev;
struct drm_crtc **save_encoder_crtcs, *new_crtc;
struct drm_encoder **save_connector_encoders, *new_encoder, *encoder;
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 *connector;
struct drm_connector_list_iter conn_iter;
int count = 0, ro, fail = 0;
const struct drm_crtc_helper_funcs *crtc_funcs;
struct drm_mode_set save_set;
int ret;
int i;
BUG_ON(!set);
BUG_ON(!set->crtc);
BUG_ON(!set->crtc->helper_private);
/* Enforce sane interface api - has been abused by the fb helper. */
BUG_ON(!set->mode && set->fb);
BUG_ON(set->fb && set->num_connectors == 0);
crtc_funcs = set->crtc->helper_private;
dev = set->crtc->dev;
drm_dbg_kms(dev, "\n");
drm_WARN_ON(dev, drm_drv_uses_atomic_modeset(dev));
if (!set->mode)
set->fb = NULL;
if (set->fb) {
drm_dbg_kms(dev, "[CRTC:%d:%s] [FB:%d] #connectors=%d (x y) (%i %i)\n",
set->crtc->base.id, set->crtc->name,
set->fb->base.id,
(int)set->num_connectors, set->x, set->y);
} else {
drm_dbg_kms(dev, "[CRTC:%d:%s] [NOFB]\n",
set->crtc->base.id, set->crtc->name);
drm_crtc_helper_disable(set->crtc);
return 0;
}
drm_warn_on_modeset_not_all_locked(dev);
/*
* Allocate space for the backup of all (non-pointer) encoder and
* connector data.
*/
save_encoder_crtcs = kcalloc(dev->mode_config.num_encoder,
sizeof(struct drm_crtc *), GFP_KERNEL);
if (!save_encoder_crtcs)
return -ENOMEM;
save_connector_encoders = kcalloc(dev->mode_config.num_connector,
sizeof(struct drm_encoder *), GFP_KERNEL);
if (!save_connector_encoders) {
kfree(save_encoder_crtcs);
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;
drm_for_each_encoder(encoder, dev) {
save_encoder_crtcs[count++] = encoder->crtc;
}
count = 0;
drm_connector_list_iter_begin(dev, &conn_iter);
drm_for_each_connector_iter(connector, &conn_iter)
save_connector_encoders[count++] = connector->encoder;
drm_connector_list_iter_end(&conn_iter);
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->primary->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->primary->fb != set->fb) {
/* If we have no fb then treat it as a full mode set */
if (set->crtc->primary->fb == NULL) {
drm_dbg_kms(dev, "[CRTC:%d:%s] no fb, full mode set\n",
set->crtc->base.id, set->crtc->name);
mode_changed = true;
} else if (set->fb->format != set->crtc->primary->fb->format) {
mode_changed = true;
} else
fb_changed = true;
}
if (set->x != set->crtc->x || set->y != set->crtc->y)
fb_changed = true;
if (!drm_mode_equal(set->mode, &set->crtc->mode)) {
drm_dbg_kms(dev, "[CRTC:%d:%s] modes are different, full mode set:\n",
set->crtc->base.id, set->crtc->name);
drm_dbg_kms(dev, DRM_MODE_FMT "\n", DRM_MODE_ARG(&set->crtc->mode));
drm_dbg_kms(dev, DRM_MODE_FMT "\n", DRM_MODE_ARG(set->mode));
mode_changed = true;
}
/* take a reference on all unbound connectors in set, reuse the
* already taken reference for bound connectors
*/
for (ro = 0; ro < set->num_connectors; ro++) {
if (set->connectors[ro]->encoder)
continue;
drm_connector_get(set->connectors[ro]);
}
/* a) traverse passed in connector list and get encoders for them */
count = 0;
drm_connector_list_iter_begin(dev, &conn_iter);
drm_for_each_connector_iter(connector, &conn_iter) {
const 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) {
if (connector_funcs->best_encoder)
new_encoder = connector_funcs->best_encoder(connector);
else
new_encoder = drm_connector_get_single_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;
if (connector->dpms != DRM_MODE_DPMS_ON) {
drm_dbg_kms(dev, "[CONNECTOR:%d:%s] DPMS not on, full mode switch\n",
connector->base.id, connector->name);
mode_changed = true;
}
break;
}
}
if (new_encoder != connector->encoder) {
drm_dbg_kms(dev, "[CONNECTOR:%d:%s] encoder changed, full mode switch\n",
connector->base.id, connector->name);
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;
}
}
drm_connector_list_iter_end(&conn_iter);
if (fail) {
ret = -EINVAL;
goto fail;
}
count = 0;
drm_connector_list_iter_begin(dev, &conn_iter);
drm_for_each_connector_iter(connector, &conn_iter) {
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;
drm_connector_list_iter_end(&conn_iter);
goto fail;
}
if (new_crtc != connector->encoder->crtc) {
drm_dbg_kms(dev, "[CONNECTOR:%d:%s] CRTC changed, full mode switch\n",
connector->base.id, connector->name);
mode_changed = true;
connector->encoder->crtc = new_crtc;
}
if (new_crtc) {
drm_dbg_kms(dev, "[CONNECTOR:%d:%s] to [CRTC:%d:%s]\n",
connector->base.id, connector->name,
new_crtc->base.id, new_crtc->name);
} else {
drm_dbg_kms(dev, "[CONNECTOR:%d:%s] to [NOCRTC]\n",
connector->base.id, connector->name);
}
}
drm_connector_list_iter_end(&conn_iter);
/* mode_set_base is not a required function */
if (fb_changed && !crtc_funcs->mode_set_base)
mode_changed = true;
if (mode_changed) {
if (drm_helper_crtc_in_use(set->crtc)) {
drm_dbg_kms(dev, "[CRTC:%d:%s] attempting to set mode from userspace: " DRM_MODE_FMT "\n",
set->crtc->base.id, set->crtc->name, DRM_MODE_ARG(set->mode));
set->crtc->primary->fb = set->fb;
if (!drm_crtc_helper_set_mode(set->crtc, set->mode,
set->x, set->y,
save_set.fb)) {
drm_err(dev, "[CRTC:%d:%s] failed to set mode\n",
set->crtc->base.id, set->crtc->name);
set->crtc->primary->fb = save_set.fb;
ret = -EINVAL;
goto fail;
}
drm_dbg_kms(dev, "[CRTC:%d:%s] Setting connector DPMS state to on\n",
set->crtc->base.id, set->crtc->name);
for (i = 0; i < set->num_connectors; i++) {
drm_dbg_kms(dev, "\t[CONNECTOR:%d:%s] set DPMS on\n", set->connectors[i]->base.id,
set->connectors[i]->name);
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;
set->crtc->primary->fb = set->fb;
ret = crtc_funcs->mode_set_base(set->crtc,
set->x, set->y, save_set.fb);
if (ret != 0) {
set->crtc->x = save_set.x;
set->crtc->y = save_set.y;
set->crtc->primary->fb = save_set.fb;
goto fail;
}
}
kfree(save_connector_encoders);
kfree(save_encoder_crtcs);
return 0;
fail:
/* Restore all previous data. */
count = 0;
drm_for_each_encoder(encoder, dev) {
encoder->crtc = save_encoder_crtcs[count++];
}
count = 0;
drm_connector_list_iter_begin(dev, &conn_iter);
drm_for_each_connector_iter(connector, &conn_iter)
connector->encoder = save_connector_encoders[count++];
drm_connector_list_iter_end(&conn_iter);
/* after fail drop reference on all unbound connectors in set, let
* bound connectors keep their reference
*/
for (ro = 0; ro < set->num_connectors; ro++) {
if (set->connectors[ro]->encoder)
continue;
drm_connector_put(set->connectors[ro]);
}
/* 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_err(dev, "failed to restore config after modeset failure\n");
kfree(save_connector_encoders);
kfree(save_encoder_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_connector_list_iter conn_iter;
struct drm_device *dev = encoder->dev;
drm_connector_list_iter_begin(dev, &conn_iter);
drm_for_each_connector_iter(connector, &conn_iter)
if (connector->encoder == encoder)
if (connector->dpms < dpms)
dpms = connector->dpms;
drm_connector_list_iter_end(&conn_iter);
return dpms;
}
/* Helper which handles bridge ordering around encoder dpms */
static void drm_helper_encoder_dpms(struct drm_encoder *encoder, int mode)
{
const struct drm_encoder_helper_funcs *encoder_funcs;
encoder_funcs = encoder->helper_private;
if (!encoder_funcs)
return;
if (encoder_funcs->dpms)
encoder_funcs->dpms(encoder, mode);
}
static int drm_helper_choose_crtc_dpms(struct drm_crtc *crtc)
{
int dpms = DRM_MODE_DPMS_OFF;
struct drm_connector *connector;
struct drm_connector_list_iter conn_iter;
struct drm_device *dev = crtc->dev;
drm_connector_list_iter_begin(dev, &conn_iter);
drm_for_each_connector_iter(connector, &conn_iter)
if (connector->encoder && connector->encoder->crtc == crtc)
if (connector->dpms < dpms)
dpms = connector->dpms;
drm_connector_list_iter_end(&conn_iter);
return dpms;
}
/**
* drm_helper_connector_dpms() - connector dpms helper implementation
* @connector: affected connector
* @mode: DPMS mode
*
* The drm_helper_connector_dpms() helper function implements the
* &drm_connector_funcs.dpms callback for drivers using the legacy CRTC
* helpers.
*
* 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
* &drm_crtc_helper_funcs.dpms and &drm_encoder_helper_funcs.dpms callbacks
* provided by the driver.
*
* This function is deprecated. New drivers must implement atomic modeset
* support, where DPMS is handled in the DRM core.
*
* Returns:
* Always returns 0.
*/
int 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, encoder_dpms = DRM_MODE_DPMS_OFF;
drm_WARN_ON(connector->dev, drm_drv_uses_atomic_modeset(connector->dev));
if (mode == connector->dpms)
return 0;
old_dpms = connector->dpms;
connector->dpms = mode;
if (encoder)
encoder_dpms = drm_helper_choose_encoder_dpms(encoder);
/* from off to on, do crtc then encoder */
if (mode < old_dpms) {
if (crtc) {
const 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)
drm_helper_encoder_dpms(encoder, encoder_dpms);
}
/* from on to off, do encoder then crtc */
if (mode > old_dpms) {
if (encoder)
drm_helper_encoder_dpms(encoder, encoder_dpms);
if (crtc) {
const 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 0;
}
EXPORT_SYMBOL(drm_helper_connector_dpms);
/**
* drm_helper_resume_force_mode - force-restore mode setting configuration
* @dev: drm_device which should be restored
*
* Drivers which use the mode setting helpers can use this function to
* force-restore the mode setting configuration e.g. on resume or when something
* else might have trampled over the hw state (like some overzealous old BIOSen
* tended to do).
*
* This helper doesn't provide a error return value since restoring the old
* config should never fail due to resource allocation issues since the driver
* has successfully set the restored configuration already. Hence this should
* boil down to the equivalent of a few dpms on calls, which also don't provide
* an error code.
*
* Drivers where simply restoring an old configuration again might fail (e.g.
* due to slight differences in allocating shared resources when the
* configuration is restored in a different order than when userspace set it up)
* need to use their own restore logic.
*
* This function is deprecated. New drivers should implement atomic mode-
* setting and use the atomic suspend/resume helpers.
*
* See also:
* drm_atomic_helper_suspend(), drm_atomic_helper_resume()
*/
void drm_helper_resume_force_mode(struct drm_device *dev)
{
struct drm_crtc *crtc;
struct drm_encoder *encoder;
const struct drm_crtc_helper_funcs *crtc_funcs;
int encoder_dpms;
bool ret;
drm_WARN_ON(dev, drm_drv_uses_atomic_modeset(dev));
drm_modeset_lock_all(dev);
drm_for_each_crtc(crtc, dev) {
if (!crtc->enabled)
continue;
ret = drm_crtc_helper_set_mode(crtc, &crtc->mode,
crtc->x, crtc->y, crtc->primary->fb);
/* Restoring the old config should never fail! */
if (ret == false)
drm_err(dev, "failed to set mode on crtc %p\n", crtc);
/* Turn off outputs that were already powered off */
if (drm_helper_choose_crtc_dpms(crtc)) {
drm_for_each_encoder(encoder, dev) {
if(encoder->crtc != crtc)
continue;
encoder_dpms = drm_helper_choose_encoder_dpms(
encoder);
drm_helper_encoder_dpms(encoder, encoder_dpms);
}
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);
drm_modeset_unlock_all(dev);
}
EXPORT_SYMBOL(drm_helper_resume_force_mode);
/**
* drm_helper_force_disable_all - Forcibly turn off all enabled CRTCs
* @dev: DRM device whose CRTCs to turn off
*
* Drivers may want to call this on unload to ensure that all displays are
* unlit and the GPU is in a consistent, low power state. Takes modeset locks.
*
* Note: This should only be used by non-atomic legacy drivers. For an atomic
* version look at drm_atomic_helper_shutdown().
*
* Returns:
* Zero on success, error code on failure.
*/
int drm_helper_force_disable_all(struct drm_device *dev)
{
struct drm_crtc *crtc;
int ret = 0;
drm_modeset_lock_all(dev);
drm_for_each_crtc(crtc, dev)
if (crtc->enabled) {
struct drm_mode_set set = {
.crtc = crtc,
};
ret = drm_mode_set_config_internal(&set);
if (ret)
goto out;
}
out:
drm_modeset_unlock_all(dev);
return ret;
}
EXPORT_SYMBOL(drm_helper_force_disable_all);
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