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1022 lines
30 KiB
1022 lines
30 KiB
/* |
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* Copyright (c) 2006-2008 Intel Corporation |
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* Copyright (c) 2007 Dave Airlie <[email protected]> |
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* |
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* DRM core CRTC related functions |
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* |
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* Permission to use, copy, modify, distribute, and sell this software and its |
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* documentation for any purpose is hereby granted without fee, provided that |
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* the above copyright notice appear in all copies and that both that copyright |
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* notice and this permission notice appear in supporting documentation, and |
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* that the name of the copyright holders not be used in advertising or |
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* publicity pertaining to distribution of the software without specific, |
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* written prior permission. The copyright holders make no representations |
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* about the suitability of this software for any purpose. It is provided "as |
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* is" without express or implied warranty. |
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* |
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* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, |
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* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO |
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* EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR |
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* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, |
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* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER |
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* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE |
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* OF THIS SOFTWARE. |
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* |
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* Authors: |
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* Keith Packard |
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* Eric Anholt <[email protected]> |
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* Dave Airlie <[email protected]> |
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* Jesse Barnes <[email protected]> |
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*/ |
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|
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#include <linux/export.h> |
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#include <linux/kernel.h> |
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#include <linux/moduleparam.h> |
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|
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#include <drm/drm_atomic.h> |
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#include <drm/drm_atomic_helper.h> |
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#include <drm/drm_atomic_uapi.h> |
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#include <drm/drm_bridge.h> |
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#include <drm/drm_crtc.h> |
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#include <drm/drm_crtc_helper.h> |
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#include <drm/drm_drv.h> |
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#include <drm/drm_edid.h> |
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#include <drm/drm_encoder.h> |
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#include <drm/drm_fb_helper.h> |
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#include <drm/drm_fourcc.h> |
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#include <drm/drm_plane_helper.h> |
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#include <drm/drm_print.h> |
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#include <drm/drm_vblank.h> |
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|
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#include "drm_crtc_helper_internal.h" |
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|
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/** |
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* DOC: overview |
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* |
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* The CRTC modeset helper library provides a default set_config implementation |
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* in drm_crtc_helper_set_config(). Plus a few other convenience functions using |
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* the same callbacks which drivers can use to e.g. restore the modeset |
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* configuration on resume with drm_helper_resume_force_mode(). |
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* |
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* Note that this helper library doesn't track the current power state of CRTCs |
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* and encoders. It can call callbacks like &drm_encoder_helper_funcs.dpms even |
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* though the hardware is already in the desired state. This deficiency has been |
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* fixed in the atomic helpers. |
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* |
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* The driver callbacks are mostly compatible with the atomic modeset helpers, |
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* except for the handling of the primary plane: Atomic helpers require that the |
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* primary plane is implemented as a real standalone plane and not directly tied |
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* to the CRTC state. For easier transition this library provides functions to |
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* implement the old semantics required by the CRTC helpers using the new plane |
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* and atomic helper callbacks. |
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* |
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* Drivers are strongly urged to convert to the atomic helpers (by way of first |
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* converting to the plane helpers). New drivers must not use these functions |
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* but need to implement the atomic interface instead, potentially using the |
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* atomic helpers for that. |
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* |
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* These legacy modeset helpers use the same function table structures as |
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* all other modesetting helpers. See the documentation for struct |
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* &drm_crtc_helper_funcs, &struct drm_encoder_helper_funcs and struct |
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* &drm_connector_helper_funcs. |
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*/ |
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|
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/** |
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* drm_helper_encoder_in_use - check if a given encoder is in use |
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* @encoder: encoder to check |
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* |
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* Checks whether @encoder is with the current mode setting output configuration |
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* in use by any connector. This doesn't mean that it is actually enabled since |
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* the DPMS state is tracked separately. |
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* |
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* Returns: |
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* True if @encoder is used, false otherwise. |
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*/ |
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bool drm_helper_encoder_in_use(struct drm_encoder *encoder) |
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{ |
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struct drm_connector *connector; |
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struct drm_connector_list_iter conn_iter; |
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struct drm_device *dev = encoder->dev; |
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|
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WARN_ON(drm_drv_uses_atomic_modeset(dev)); |
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|
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/* |
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* We can expect this mutex to be locked if we are not panicking. |
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* Locking is currently fubar in the panic handler. |
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*/ |
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if (!oops_in_progress) { |
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WARN_ON(!mutex_is_locked(&dev->mode_config.mutex)); |
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WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex)); |
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} |
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|
|
|
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drm_connector_list_iter_begin(dev, &conn_iter); |
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drm_for_each_connector_iter(connector, &conn_iter) { |
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if (connector->encoder == encoder) { |
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drm_connector_list_iter_end(&conn_iter); |
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return true; |
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} |
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} |
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drm_connector_list_iter_end(&conn_iter); |
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return false; |
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} |
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EXPORT_SYMBOL(drm_helper_encoder_in_use); |
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|
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/** |
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* drm_helper_crtc_in_use - check if a given CRTC is in a mode_config |
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* @crtc: CRTC to check |
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* |
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* Checks whether @crtc is with the current mode setting output configuration |
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* in use by any connector. This doesn't mean that it is actually enabled since |
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* the DPMS state is tracked separately. |
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* |
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* Returns: |
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* True if @crtc is used, false otherwise. |
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*/ |
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bool drm_helper_crtc_in_use(struct drm_crtc *crtc) |
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{ |
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struct drm_encoder *encoder; |
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struct drm_device *dev = crtc->dev; |
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|
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WARN_ON(drm_drv_uses_atomic_modeset(dev)); |
|
|
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/* |
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* We can expect this mutex to be locked if we are not panicking. |
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* Locking is currently fubar in the panic handler. |
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*/ |
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if (!oops_in_progress) |
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WARN_ON(!mutex_is_locked(&dev->mode_config.mutex)); |
|
|
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drm_for_each_encoder(encoder, dev) |
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if (encoder->crtc == crtc && drm_helper_encoder_in_use(encoder)) |
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return true; |
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return false; |
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} |
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EXPORT_SYMBOL(drm_helper_crtc_in_use); |
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|
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static void |
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drm_encoder_disable(struct drm_encoder *encoder) |
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{ |
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const struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private; |
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|
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if (!encoder_funcs) |
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return; |
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|
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if (encoder_funcs->disable) |
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(*encoder_funcs->disable)(encoder); |
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else if (encoder_funcs->dpms) |
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(*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF); |
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} |
|
|
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static void __drm_helper_disable_unused_functions(struct drm_device *dev) |
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{ |
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struct drm_encoder *encoder; |
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struct drm_crtc *crtc; |
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|
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drm_warn_on_modeset_not_all_locked(dev); |
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|
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drm_for_each_encoder(encoder, dev) { |
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if (!drm_helper_encoder_in_use(encoder)) { |
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drm_encoder_disable(encoder); |
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/* disconnect encoder from any connector */ |
|
encoder->crtc = NULL; |
|
} |
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} |
|
|
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drm_for_each_crtc(crtc, dev) { |
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const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private; |
|
|
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crtc->enabled = drm_helper_crtc_in_use(crtc); |
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if (!crtc->enabled) { |
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if (crtc_funcs->disable) |
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(*crtc_funcs->disable)(crtc); |
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else |
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(*crtc_funcs->dpms)(crtc, DRM_MODE_DPMS_OFF); |
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crtc->primary->fb = NULL; |
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} |
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} |
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} |
|
|
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/** |
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* drm_helper_disable_unused_functions - disable unused objects |
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* @dev: DRM device |
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* |
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* This function walks through the entire mode setting configuration of @dev. It |
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* will remove any CRTC links of unused encoders and encoder links of |
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* disconnected connectors. Then it will disable all unused encoders and CRTCs |
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* either by calling their disable callback if available or by calling their |
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* dpms callback with DRM_MODE_DPMS_OFF. |
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* |
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* NOTE: |
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* |
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* This function is part of the legacy modeset helper library and will cause |
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* major confusion with atomic drivers. This is because atomic helpers guarantee |
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* to never call ->disable() hooks on a disabled function, or ->enable() hooks |
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* on an enabled functions. drm_helper_disable_unused_functions() on the other |
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* hand throws such guarantees into the wind and calls disable hooks |
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* unconditionally on unused functions. |
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*/ |
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void drm_helper_disable_unused_functions(struct drm_device *dev) |
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{ |
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WARN_ON(drm_drv_uses_atomic_modeset(dev)); |
|
|
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drm_modeset_lock_all(dev); |
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__drm_helper_disable_unused_functions(dev); |
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drm_modeset_unlock_all(dev); |
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} |
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EXPORT_SYMBOL(drm_helper_disable_unused_functions); |
|
|
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/* |
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* Check the CRTC we're going to map each output to vs. its current |
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* CRTC. If they don't match, we have to disable the output and the CRTC |
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* since the driver will have to re-route things. |
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*/ |
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static void |
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drm_crtc_prepare_encoders(struct drm_device *dev) |
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{ |
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const struct drm_encoder_helper_funcs *encoder_funcs; |
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struct drm_encoder *encoder; |
|
|
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drm_for_each_encoder(encoder, dev) { |
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encoder_funcs = encoder->helper_private; |
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if (!encoder_funcs) |
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continue; |
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|
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/* Disable unused encoders */ |
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if (encoder->crtc == NULL) |
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drm_encoder_disable(encoder); |
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} |
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} |
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|
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/** |
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* drm_crtc_helper_set_mode - internal helper to set a mode |
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* @crtc: CRTC to program |
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* @mode: mode to use |
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* @x: horizontal offset into the surface |
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* @y: vertical offset into the surface |
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* @old_fb: old framebuffer, for cleanup |
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* |
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* Try to set @mode on @crtc. Give @crtc and its associated connectors a chance |
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* to fixup or reject the mode prior to trying to set it. This is an internal |
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* helper that drivers could e.g. use to update properties that require the |
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* entire output pipe to be disabled and re-enabled in a new configuration. For |
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* example for changing whether audio is enabled on a hdmi link or for changing |
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* panel fitter or dither attributes. It is also called by the |
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* drm_crtc_helper_set_config() helper function to drive the mode setting |
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* sequence. |
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* |
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* Returns: |
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* True if the mode was set successfully, false otherwise. |
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*/ |
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bool drm_crtc_helper_set_mode(struct drm_crtc *crtc, |
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struct drm_display_mode *mode, |
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int x, int y, |
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struct drm_framebuffer *old_fb) |
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{ |
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struct drm_device *dev = crtc->dev; |
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struct drm_display_mode *adjusted_mode, saved_mode, saved_hwmode; |
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const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private; |
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const struct drm_encoder_helper_funcs *encoder_funcs; |
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int saved_x, saved_y; |
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bool saved_enabled; |
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struct drm_encoder *encoder; |
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bool ret = true; |
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|
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WARN_ON(drm_drv_uses_atomic_modeset(dev)); |
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|
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drm_warn_on_modeset_not_all_locked(dev); |
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|
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saved_enabled = crtc->enabled; |
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crtc->enabled = drm_helper_crtc_in_use(crtc); |
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if (!crtc->enabled) |
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return true; |
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|
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adjusted_mode = drm_mode_duplicate(dev, mode); |
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if (!adjusted_mode) { |
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crtc->enabled = saved_enabled; |
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return false; |
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} |
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|
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saved_mode = crtc->mode; |
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saved_hwmode = crtc->hwmode; |
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saved_x = crtc->x; |
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saved_y = crtc->y; |
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|
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/* Update crtc values up front so the driver can rely on them for mode |
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* setting. |
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*/ |
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crtc->mode = *mode; |
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crtc->x = x; |
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crtc->y = y; |
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|
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/* Pass our mode to the connectors and the CRTC to give them a chance to |
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* adjust it according to limitations or connector properties, and also |
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* a chance to reject the mode entirely. |
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*/ |
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drm_for_each_encoder(encoder, dev) { |
|
|
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if (encoder->crtc != crtc) |
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continue; |
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|
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encoder_funcs = encoder->helper_private; |
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if (!encoder_funcs) |
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continue; |
|
|
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encoder_funcs = encoder->helper_private; |
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if (encoder_funcs->mode_fixup) { |
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if (!(ret = encoder_funcs->mode_fixup(encoder, mode, |
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adjusted_mode))) { |
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DRM_DEBUG_KMS("Encoder fixup failed\n"); |
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goto done; |
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} |
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} |
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} |
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|
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if (crtc_funcs->mode_fixup) { |
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if (!(ret = crtc_funcs->mode_fixup(crtc, mode, |
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adjusted_mode))) { |
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DRM_DEBUG_KMS("CRTC fixup failed\n"); |
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goto done; |
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} |
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} |
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DRM_DEBUG_KMS("[CRTC:%d:%s]\n", crtc->base.id, crtc->name); |
|
|
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crtc->hwmode = *adjusted_mode; |
|
|
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/* Prepare the encoders and CRTCs before setting the mode. */ |
|
drm_for_each_encoder(encoder, dev) { |
|
|
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if (encoder->crtc != crtc) |
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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); |
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} |
|
|
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drm_crtc_prepare_encoders(dev); |
|
|
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crtc_funcs->prepare(crtc); |
|
|
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/* Set up the DPLL and any encoders state that needs to adjust or depend |
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* on the DPLL. |
|
*/ |
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ret = !crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y, old_fb); |
|
if (!ret) |
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goto done; |
|
|
|
drm_for_each_encoder(encoder, dev) { |
|
|
|
if (encoder->crtc != crtc) |
|
continue; |
|
|
|
encoder_funcs = encoder->helper_private; |
|
if (!encoder_funcs) |
|
continue; |
|
|
|
DRM_DEBUG_KMS("[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. |
|
*/ |
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drm_calc_timestamping_constants(crtc, &crtc->hwmode); |
|
|
|
/* FIXME: add subpixel order */ |
|
done: |
|
drm_mode_destroy(dev, adjusted_mode); |
|
if (!ret) { |
|
crtc->enabled = saved_enabled; |
|
crtc->mode = saved_mode; |
|
crtc->hwmode = saved_hwmode; |
|
crtc->x = saved_x; |
|
crtc->y = saved_y; |
|
} |
|
|
|
return ret; |
|
} |
|
EXPORT_SYMBOL(drm_crtc_helper_set_mode); |
|
|
|
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; |
|
|
|
WARN_ON(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; |
|
|
|
DRM_DEBUG_KMS("\n"); |
|
|
|
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; |
|
WARN_ON(drm_drv_uses_atomic_modeset(dev)); |
|
|
|
if (!set->mode) |
|
set->fb = NULL; |
|
|
|
if (set->fb) { |
|
DRM_DEBUG_KMS("[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_DEBUG_KMS("[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_DEBUG_KMS("crtc has no fb, full mode set\n"); |
|
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_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; |
|
} |
|
|
|
/* 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_DEBUG_KMS("connector dpms not on, full mode switch\n"); |
|
mode_changed = true; |
|
} |
|
|
|
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; |
|
} |
|
} |
|
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_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:%s]\n", |
|
connector->base.id, connector->name, |
|
new_crtc->base.id, new_crtc->name); |
|
} else { |
|
DRM_DEBUG_KMS("[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_DEBUG_KMS("attempting to set mode from" |
|
" userspace\n"); |
|
drm_mode_debug_printmodeline(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_ERROR("failed to set mode on [CRTC:%d:%s]\n", |
|
set->crtc->base.id, set->crtc->name); |
|
set->crtc->primary->fb = save_set.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, |
|
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_ERROR("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; |
|
|
|
WARN_ON(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; |
|
|
|
WARN_ON(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_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)) { |
|
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);
|
|
|