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966 lines
30 KiB
966 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/moduleparam.h> |
|
|
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#include <drm/drm_bridge.h> |
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#include <drm/drm_client.h> |
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#include <drm/drm_crtc.h> |
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#include <drm/drm_edid.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_modeset_helper_vtables.h> |
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#include <drm/drm_print.h> |
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#include <drm/drm_probe_helper.h> |
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#include <drm/drm_sysfs.h> |
|
|
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#include "drm_crtc_helper_internal.h" |
|
|
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/** |
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* DOC: output probing helper overview |
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* |
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* This library provides some helper code for output probing. It provides an |
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* implementation of the core &drm_connector_funcs.fill_modes interface with |
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* drm_helper_probe_single_connector_modes(). |
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* |
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* It also provides support for polling connectors with a work item and for |
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* generic hotplug interrupt handling where the driver doesn't or cannot keep |
|
* track of a per-connector hpd interrupt. |
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* |
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* This helper library can be used independently of the modeset helper library. |
|
* Drivers can also overwrite different parts e.g. use their own hotplug |
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* handling code to avoid probing unrelated outputs. |
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* |
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* The probe helpers share the function table structures with other display |
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* helper libraries. See &struct drm_connector_helper_funcs for the details. |
|
*/ |
|
|
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static bool drm_kms_helper_poll = true; |
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module_param_named(poll, drm_kms_helper_poll, bool, 0600); |
|
|
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static enum drm_mode_status |
|
drm_mode_validate_flag(const struct drm_display_mode *mode, |
|
int flags) |
|
{ |
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if ((mode->flags & DRM_MODE_FLAG_INTERLACE) && |
|
!(flags & DRM_MODE_FLAG_INTERLACE)) |
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return MODE_NO_INTERLACE; |
|
|
|
if ((mode->flags & DRM_MODE_FLAG_DBLSCAN) && |
|
!(flags & DRM_MODE_FLAG_DBLSCAN)) |
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return MODE_NO_DBLESCAN; |
|
|
|
if ((mode->flags & DRM_MODE_FLAG_3D_MASK) && |
|
!(flags & DRM_MODE_FLAG_3D_MASK)) |
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return MODE_NO_STEREO; |
|
|
|
return MODE_OK; |
|
} |
|
|
|
static int |
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drm_mode_validate_pipeline(struct drm_display_mode *mode, |
|
struct drm_connector *connector, |
|
struct drm_modeset_acquire_ctx *ctx, |
|
enum drm_mode_status *status) |
|
{ |
|
struct drm_device *dev = connector->dev; |
|
struct drm_encoder *encoder; |
|
int ret; |
|
|
|
/* Step 1: Validate against connector */ |
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ret = drm_connector_mode_valid(connector, mode, ctx, status); |
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if (ret || *status != MODE_OK) |
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return ret; |
|
|
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/* Step 2: Validate against encoders and crtcs */ |
|
drm_connector_for_each_possible_encoder(connector, encoder) { |
|
struct drm_bridge *bridge; |
|
struct drm_crtc *crtc; |
|
|
|
*status = drm_encoder_mode_valid(encoder, mode); |
|
if (*status != MODE_OK) { |
|
/* No point in continuing for crtc check as this encoder |
|
* will not accept the mode anyway. If all encoders |
|
* reject the mode then, at exit, ret will not be |
|
* MODE_OK. */ |
|
continue; |
|
} |
|
|
|
bridge = drm_bridge_chain_get_first_bridge(encoder); |
|
*status = drm_bridge_chain_mode_valid(bridge, |
|
&connector->display_info, |
|
mode); |
|
if (*status != MODE_OK) { |
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/* There is also no point in continuing for crtc check |
|
* here. */ |
|
continue; |
|
} |
|
|
|
drm_for_each_crtc(crtc, dev) { |
|
if (!drm_encoder_crtc_ok(encoder, crtc)) |
|
continue; |
|
|
|
*status = drm_crtc_mode_valid(crtc, mode); |
|
if (*status == MODE_OK) { |
|
/* If we get to this point there is at least |
|
* one combination of encoder+crtc that works |
|
* for this mode. Lets return now. */ |
|
return 0; |
|
} |
|
} |
|
} |
|
|
|
return 0; |
|
} |
|
|
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static int drm_helper_probe_add_cmdline_mode(struct drm_connector *connector) |
|
{ |
|
struct drm_cmdline_mode *cmdline_mode; |
|
struct drm_display_mode *mode; |
|
|
|
cmdline_mode = &connector->cmdline_mode; |
|
if (!cmdline_mode->specified) |
|
return 0; |
|
|
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/* Only add a GTF mode if we find no matching probed modes */ |
|
list_for_each_entry(mode, &connector->probed_modes, head) { |
|
if (mode->hdisplay != cmdline_mode->xres || |
|
mode->vdisplay != cmdline_mode->yres) |
|
continue; |
|
|
|
if (cmdline_mode->refresh_specified) { |
|
/* The probed mode's vrefresh is set until later */ |
|
if (drm_mode_vrefresh(mode) != cmdline_mode->refresh) |
|
continue; |
|
} |
|
|
|
/* Mark the matching mode as being preferred by the user */ |
|
mode->type |= DRM_MODE_TYPE_USERDEF; |
|
return 0; |
|
} |
|
|
|
mode = drm_mode_create_from_cmdline_mode(connector->dev, |
|
cmdline_mode); |
|
if (mode == NULL) |
|
return 0; |
|
|
|
drm_mode_probed_add(connector, mode); |
|
return 1; |
|
} |
|
|
|
enum drm_mode_status drm_crtc_mode_valid(struct drm_crtc *crtc, |
|
const struct drm_display_mode *mode) |
|
{ |
|
const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private; |
|
|
|
if (!crtc_funcs || !crtc_funcs->mode_valid) |
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return MODE_OK; |
|
|
|
return crtc_funcs->mode_valid(crtc, mode); |
|
} |
|
|
|
enum drm_mode_status drm_encoder_mode_valid(struct drm_encoder *encoder, |
|
const struct drm_display_mode *mode) |
|
{ |
|
const struct drm_encoder_helper_funcs *encoder_funcs = |
|
encoder->helper_private; |
|
|
|
if (!encoder_funcs || !encoder_funcs->mode_valid) |
|
return MODE_OK; |
|
|
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return encoder_funcs->mode_valid(encoder, mode); |
|
} |
|
|
|
int |
|
drm_connector_mode_valid(struct drm_connector *connector, |
|
struct drm_display_mode *mode, |
|
struct drm_modeset_acquire_ctx *ctx, |
|
enum drm_mode_status *status) |
|
{ |
|
const struct drm_connector_helper_funcs *connector_funcs = |
|
connector->helper_private; |
|
int ret = 0; |
|
|
|
if (!connector_funcs) |
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*status = MODE_OK; |
|
else if (connector_funcs->mode_valid_ctx) |
|
ret = connector_funcs->mode_valid_ctx(connector, mode, ctx, |
|
status); |
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else if (connector_funcs->mode_valid) |
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*status = connector_funcs->mode_valid(connector, mode); |
|
else |
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*status = MODE_OK; |
|
|
|
return ret; |
|
} |
|
|
|
#define DRM_OUTPUT_POLL_PERIOD (10*HZ) |
|
/** |
|
* drm_kms_helper_poll_enable - re-enable output polling. |
|
* @dev: drm_device |
|
* |
|
* This function re-enables the output polling work, after it has been |
|
* temporarily disabled using drm_kms_helper_poll_disable(), for example over |
|
* suspend/resume. |
|
* |
|
* Drivers can call this helper from their device resume implementation. It is |
|
* not an error to call this even when output polling isn't enabled. |
|
* |
|
* Note that calls to enable and disable polling must be strictly ordered, which |
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* is automatically the case when they're only call from suspend/resume |
|
* callbacks. |
|
*/ |
|
void drm_kms_helper_poll_enable(struct drm_device *dev) |
|
{ |
|
bool poll = false; |
|
struct drm_connector *connector; |
|
struct drm_connector_list_iter conn_iter; |
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unsigned long delay = DRM_OUTPUT_POLL_PERIOD; |
|
|
|
if (!dev->mode_config.poll_enabled || !drm_kms_helper_poll) |
|
return; |
|
|
|
drm_connector_list_iter_begin(dev, &conn_iter); |
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drm_for_each_connector_iter(connector, &conn_iter) { |
|
if (connector->polled & (DRM_CONNECTOR_POLL_CONNECT | |
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DRM_CONNECTOR_POLL_DISCONNECT)) |
|
poll = true; |
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} |
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drm_connector_list_iter_end(&conn_iter); |
|
|
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if (dev->mode_config.delayed_event) { |
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/* |
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* FIXME: |
|
* |
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* Use short (1s) delay to handle the initial delayed event. |
|
* This delay should not be needed, but Optimus/nouveau will |
|
* fail in a mysterious way if the delayed event is handled as |
|
* soon as possible like it is done in |
|
* drm_helper_probe_single_connector_modes() in case the poll |
|
* was enabled before. |
|
*/ |
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poll = true; |
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delay = HZ; |
|
} |
|
|
|
if (poll) |
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schedule_delayed_work(&dev->mode_config.output_poll_work, delay); |
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} |
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EXPORT_SYMBOL(drm_kms_helper_poll_enable); |
|
|
|
static enum drm_connector_status |
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drm_helper_probe_detect_ctx(struct drm_connector *connector, bool force) |
|
{ |
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const struct drm_connector_helper_funcs *funcs = connector->helper_private; |
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struct drm_modeset_acquire_ctx ctx; |
|
int ret; |
|
|
|
drm_modeset_acquire_init(&ctx, 0); |
|
|
|
retry: |
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ret = drm_modeset_lock(&connector->dev->mode_config.connection_mutex, &ctx); |
|
if (!ret) { |
|
if (funcs->detect_ctx) |
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ret = funcs->detect_ctx(connector, &ctx, force); |
|
else if (connector->funcs->detect) |
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ret = connector->funcs->detect(connector, force); |
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else |
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ret = connector_status_connected; |
|
} |
|
|
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if (ret == -EDEADLK) { |
|
drm_modeset_backoff(&ctx); |
|
goto retry; |
|
} |
|
|
|
if (WARN_ON(ret < 0)) |
|
ret = connector_status_unknown; |
|
|
|
if (ret != connector->status) |
|
connector->epoch_counter += 1; |
|
|
|
drm_modeset_drop_locks(&ctx); |
|
drm_modeset_acquire_fini(&ctx); |
|
|
|
return ret; |
|
} |
|
|
|
/** |
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* drm_helper_probe_detect - probe connector status |
|
* @connector: connector to probe |
|
* @ctx: acquire_ctx, or NULL to let this function handle locking. |
|
* @force: Whether destructive probe operations should be performed. |
|
* |
|
* This function calls the detect callbacks of the connector. |
|
* This function returns &drm_connector_status, or |
|
* if @ctx is set, it might also return -EDEADLK. |
|
*/ |
|
int |
|
drm_helper_probe_detect(struct drm_connector *connector, |
|
struct drm_modeset_acquire_ctx *ctx, |
|
bool force) |
|
{ |
|
const struct drm_connector_helper_funcs *funcs = connector->helper_private; |
|
struct drm_device *dev = connector->dev; |
|
int ret; |
|
|
|
if (!ctx) |
|
return drm_helper_probe_detect_ctx(connector, force); |
|
|
|
ret = drm_modeset_lock(&dev->mode_config.connection_mutex, ctx); |
|
if (ret) |
|
return ret; |
|
|
|
if (funcs->detect_ctx) |
|
ret = funcs->detect_ctx(connector, ctx, force); |
|
else if (connector->funcs->detect) |
|
ret = connector->funcs->detect(connector, force); |
|
else |
|
ret = connector_status_connected; |
|
|
|
if (ret != connector->status) |
|
connector->epoch_counter += 1; |
|
|
|
return ret; |
|
} |
|
EXPORT_SYMBOL(drm_helper_probe_detect); |
|
|
|
/** |
|
* 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 |
|
* |
|
* Based on the helper callbacks implemented by @connector in struct |
|
* &drm_connector_helper_funcs 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 used as a generic implementation of the |
|
* &drm_connector_funcs.fill_modes() vfunc for drivers that use the CRTC helpers |
|
* for output mode filtering and detection. |
|
* |
|
* The basic procedure is as follows |
|
* |
|
* 1. All modes currently on the connector's modes list are marked as stale |
|
* |
|
* 2. New modes are added to the connector's probed_modes list with |
|
* drm_mode_probed_add(). New modes start their life with status as OK. |
|
* Modes are added from a single source using the following priority order. |
|
* |
|
* - &drm_connector_helper_funcs.get_modes vfunc |
|
* - if the connector status is connector_status_connected, standard |
|
* VESA DMT modes up to 1024x768 are automatically added |
|
* (drm_add_modes_noedid()) |
|
* |
|
* Finally modes specified via the kernel command line (video=...) are |
|
* added in addition to what the earlier probes produced |
|
* (drm_helper_probe_add_cmdline_mode()). These modes are generated |
|
* using the VESA GTF/CVT formulas. |
|
* |
|
* 3. Modes are moved from the probed_modes list to the modes list. Potential |
|
* duplicates are merged together (see drm_connector_list_update()). |
|
* After this step the probed_modes list will be empty again. |
|
* |
|
* 4. Any non-stale mode on the modes list then undergoes validation |
|
* |
|
* - drm_mode_validate_basic() performs basic sanity checks |
|
* - drm_mode_validate_size() filters out modes larger than @maxX and @maxY |
|
* (if specified) |
|
* - drm_mode_validate_flag() checks the modes against basic connector |
|
* capabilities (interlace_allowed,doublescan_allowed,stereo_allowed) |
|
* - the optional &drm_connector_helper_funcs.mode_valid or |
|
* &drm_connector_helper_funcs.mode_valid_ctx helpers can perform driver |
|
* and/or sink specific checks |
|
* - the optional &drm_crtc_helper_funcs.mode_valid, |
|
* &drm_bridge_funcs.mode_valid and &drm_encoder_helper_funcs.mode_valid |
|
* helpers can perform driver and/or source specific checks which are also |
|
* enforced by the modeset/atomic helpers |
|
* |
|
* 5. Any mode whose status is not OK is pruned from the connector's modes list, |
|
* accompanied by a debug message indicating the reason for the mode's |
|
* rejection (see drm_mode_prune_invalid()). |
|
* |
|
* Returns: |
|
* The 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; |
|
const struct drm_connector_helper_funcs *connector_funcs = |
|
connector->helper_private; |
|
int count = 0, ret; |
|
int mode_flags = 0; |
|
bool verbose_prune = true; |
|
enum drm_connector_status old_status; |
|
struct drm_modeset_acquire_ctx ctx; |
|
|
|
WARN_ON(!mutex_is_locked(&dev->mode_config.mutex)); |
|
|
|
drm_modeset_acquire_init(&ctx, 0); |
|
|
|
DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n", connector->base.id, |
|
connector->name); |
|
|
|
retry: |
|
ret = drm_modeset_lock(&dev->mode_config.connection_mutex, &ctx); |
|
if (ret == -EDEADLK) { |
|
drm_modeset_backoff(&ctx); |
|
goto retry; |
|
} else |
|
WARN_ON(ret < 0); |
|
|
|
/* set all old modes to the stale state */ |
|
list_for_each_entry(mode, &connector->modes, head) |
|
mode->status = MODE_STALE; |
|
|
|
old_status = connector->status; |
|
|
|
if (connector->force) { |
|
if (connector->force == DRM_FORCE_ON || |
|
connector->force == DRM_FORCE_ON_DIGITAL) |
|
connector->status = connector_status_connected; |
|
else |
|
connector->status = connector_status_disconnected; |
|
if (connector->funcs->force) |
|
connector->funcs->force(connector); |
|
} else { |
|
ret = drm_helper_probe_detect(connector, &ctx, true); |
|
|
|
if (ret == -EDEADLK) { |
|
drm_modeset_backoff(&ctx); |
|
goto retry; |
|
} else if (WARN(ret < 0, "Invalid return value %i for connector detection\n", ret)) |
|
ret = connector_status_unknown; |
|
|
|
connector->status = ret; |
|
} |
|
|
|
/* |
|
* Normally either the driver's hpd code or the poll loop should |
|
* pick up any changes and fire the hotplug event. But if |
|
* userspace sneaks in a probe, we might miss a change. Hence |
|
* check here, and if anything changed start the hotplug code. |
|
*/ |
|
if (old_status != connector->status) { |
|
DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %s to %s\n", |
|
connector->base.id, |
|
connector->name, |
|
drm_get_connector_status_name(old_status), |
|
drm_get_connector_status_name(connector->status)); |
|
|
|
/* |
|
* The hotplug event code might call into the fb |
|
* helpers, and so expects that we do not hold any |
|
* locks. Fire up the poll struct instead, it will |
|
* disable itself again. |
|
*/ |
|
dev->mode_config.delayed_event = true; |
|
if (dev->mode_config.poll_enabled) |
|
schedule_delayed_work(&dev->mode_config.output_poll_work, |
|
0); |
|
} |
|
|
|
/* Re-enable polling in case the global poll config changed. */ |
|
if (drm_kms_helper_poll != dev->mode_config.poll_running) |
|
drm_kms_helper_poll_enable(dev); |
|
|
|
dev->mode_config.poll_running = drm_kms_helper_poll; |
|
|
|
if (connector->status == connector_status_disconnected) { |
|
DRM_DEBUG_KMS("[CONNECTOR:%d:%s] disconnected\n", |
|
connector->base.id, connector->name); |
|
drm_connector_update_edid_property(connector, NULL); |
|
verbose_prune = false; |
|
goto prune; |
|
} |
|
|
|
count = (*connector_funcs->get_modes)(connector); |
|
|
|
/* |
|
* Fallback for when DDC probe failed in drm_get_edid() and thus skipped |
|
* override/firmware EDID. |
|
*/ |
|
if (count == 0 && connector->status == connector_status_connected) |
|
count = drm_add_override_edid_modes(connector); |
|
|
|
if (count == 0 && (connector->status == connector_status_connected || |
|
connector->status == connector_status_unknown)) |
|
count = drm_add_modes_noedid(connector, 1024, 768); |
|
count += drm_helper_probe_add_cmdline_mode(connector); |
|
if (count == 0) |
|
goto prune; |
|
|
|
drm_connector_list_update(connector); |
|
|
|
if (connector->interlace_allowed) |
|
mode_flags |= DRM_MODE_FLAG_INTERLACE; |
|
if (connector->doublescan_allowed) |
|
mode_flags |= DRM_MODE_FLAG_DBLSCAN; |
|
if (connector->stereo_allowed) |
|
mode_flags |= DRM_MODE_FLAG_3D_MASK; |
|
|
|
list_for_each_entry(mode, &connector->modes, head) { |
|
if (mode->status != MODE_OK) |
|
continue; |
|
|
|
mode->status = drm_mode_validate_driver(dev, mode); |
|
if (mode->status != MODE_OK) |
|
continue; |
|
|
|
mode->status = drm_mode_validate_size(mode, maxX, maxY); |
|
if (mode->status != MODE_OK) |
|
continue; |
|
|
|
mode->status = drm_mode_validate_flag(mode, mode_flags); |
|
if (mode->status != MODE_OK) |
|
continue; |
|
|
|
ret = drm_mode_validate_pipeline(mode, connector, &ctx, |
|
&mode->status); |
|
if (ret) { |
|
drm_dbg_kms(dev, |
|
"drm_mode_validate_pipeline failed: %d\n", |
|
ret); |
|
|
|
if (drm_WARN_ON_ONCE(dev, ret != -EDEADLK)) { |
|
mode->status = MODE_ERROR; |
|
} else { |
|
drm_modeset_backoff(&ctx); |
|
goto retry; |
|
} |
|
} |
|
|
|
if (mode->status != MODE_OK) |
|
continue; |
|
mode->status = drm_mode_validate_ycbcr420(mode, connector); |
|
} |
|
|
|
prune: |
|
drm_mode_prune_invalid(dev, &connector->modes, verbose_prune); |
|
|
|
drm_modeset_drop_locks(&ctx); |
|
drm_modeset_acquire_fini(&ctx); |
|
|
|
if (list_empty(&connector->modes)) |
|
return 0; |
|
|
|
drm_mode_sort(&connector->modes); |
|
|
|
DRM_DEBUG_KMS("[CONNECTOR:%d:%s] probed modes :\n", connector->base.id, |
|
connector->name); |
|
list_for_each_entry(mode, &connector->modes, head) { |
|
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_kms_helper_hotplug_event - fire off KMS hotplug events |
|
* @dev: drm_device whose connector state changed |
|
* |
|
* This function fires off the uevent for userspace and also calls the |
|
* output_poll_changed function, which is most commonly used to inform the fbdev |
|
* emulation code and allow it to update the fbcon output configuration. |
|
* |
|
* Drivers should call this from their hotplug handling code when a change is |
|
* detected. Note that this function does not do any output detection of its |
|
* own, like drm_helper_hpd_irq_event() does - this is assumed to be done by the |
|
* driver already. |
|
* |
|
* This function must be called from process context with no mode |
|
* setting locks held. |
|
* |
|
* If only a single connector has changed, consider calling |
|
* drm_kms_helper_connector_hotplug_event() instead. |
|
*/ |
|
void drm_kms_helper_hotplug_event(struct drm_device *dev) |
|
{ |
|
/* send a uevent + call fbdev */ |
|
drm_sysfs_hotplug_event(dev); |
|
if (dev->mode_config.funcs->output_poll_changed) |
|
dev->mode_config.funcs->output_poll_changed(dev); |
|
|
|
drm_client_dev_hotplug(dev); |
|
} |
|
EXPORT_SYMBOL(drm_kms_helper_hotplug_event); |
|
|
|
/** |
|
* drm_kms_helper_connector_hotplug_event - fire off a KMS connector hotplug event |
|
* @connector: drm_connector which has changed |
|
* |
|
* This is the same as drm_kms_helper_hotplug_event(), except it fires a more |
|
* fine-grained uevent for a single connector. |
|
*/ |
|
void drm_kms_helper_connector_hotplug_event(struct drm_connector *connector) |
|
{ |
|
struct drm_device *dev = connector->dev; |
|
|
|
/* send a uevent + call fbdev */ |
|
drm_sysfs_connector_hotplug_event(connector); |
|
if (dev->mode_config.funcs->output_poll_changed) |
|
dev->mode_config.funcs->output_poll_changed(dev); |
|
|
|
drm_client_dev_hotplug(dev); |
|
} |
|
EXPORT_SYMBOL(drm_kms_helper_connector_hotplug_event); |
|
|
|
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; |
|
struct drm_connector_list_iter conn_iter; |
|
enum drm_connector_status old_status; |
|
bool repoll = false, changed; |
|
u64 old_epoch_counter; |
|
|
|
if (!dev->mode_config.poll_enabled) |
|
return; |
|
|
|
/* Pick up any changes detected by the probe functions. */ |
|
changed = dev->mode_config.delayed_event; |
|
dev->mode_config.delayed_event = false; |
|
|
|
if (!drm_kms_helper_poll) |
|
goto out; |
|
|
|
if (!mutex_trylock(&dev->mode_config.mutex)) { |
|
repoll = true; |
|
goto out; |
|
} |
|
|
|
drm_connector_list_iter_begin(dev, &conn_iter); |
|
drm_for_each_connector_iter(connector, &conn_iter) { |
|
/* 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; |
|
|
|
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; |
|
|
|
repoll = true; |
|
|
|
old_epoch_counter = connector->epoch_counter; |
|
connector->status = drm_helper_probe_detect(connector, NULL, false); |
|
if (old_epoch_counter != connector->epoch_counter) { |
|
const char *old, *new; |
|
|
|
/* |
|
* The poll work sets force=false when calling detect so |
|
* that drivers can avoid to do disruptive tests (e.g. |
|
* when load detect cycles could cause flickering on |
|
* other, running displays). This bears the risk that we |
|
* flip-flop between unknown here in the poll work and |
|
* the real state when userspace forces a full detect |
|
* call after receiving a hotplug event due to this |
|
* change. |
|
* |
|
* Hence clamp an unknown detect status to the old |
|
* value. |
|
*/ |
|
if (connector->status == connector_status_unknown) { |
|
connector->status = old_status; |
|
continue; |
|
} |
|
|
|
old = drm_get_connector_status_name(old_status); |
|
new = drm_get_connector_status_name(connector->status); |
|
|
|
DRM_DEBUG_KMS("[CONNECTOR:%d:%s] " |
|
"status updated from %s to %s\n", |
|
connector->base.id, |
|
connector->name, |
|
old, new); |
|
DRM_DEBUG_KMS("[CONNECTOR:%d:%s] epoch counter %llu -> %llu\n", |
|
connector->base.id, connector->name, |
|
old_epoch_counter, connector->epoch_counter); |
|
|
|
changed = true; |
|
} |
|
} |
|
drm_connector_list_iter_end(&conn_iter); |
|
|
|
mutex_unlock(&dev->mode_config.mutex); |
|
|
|
out: |
|
if (changed) |
|
drm_kms_helper_hotplug_event(dev); |
|
|
|
if (repoll) |
|
schedule_delayed_work(delayed_work, DRM_OUTPUT_POLL_PERIOD); |
|
} |
|
|
|
/** |
|
* drm_kms_helper_is_poll_worker - is %current task an output poll worker? |
|
* |
|
* Determine if %current task is an output poll worker. This can be used |
|
* to select distinct code paths for output polling versus other contexts. |
|
* |
|
* One use case is to avoid a deadlock between the output poll worker and |
|
* the autosuspend worker wherein the latter waits for polling to finish |
|
* upon calling drm_kms_helper_poll_disable(), while the former waits for |
|
* runtime suspend to finish upon calling pm_runtime_get_sync() in a |
|
* connector ->detect hook. |
|
*/ |
|
bool drm_kms_helper_is_poll_worker(void) |
|
{ |
|
struct work_struct *work = current_work(); |
|
|
|
return work && work->func == output_poll_execute; |
|
} |
|
EXPORT_SYMBOL(drm_kms_helper_is_poll_worker); |
|
|
|
/** |
|
* drm_kms_helper_poll_disable - disable output polling |
|
* @dev: drm_device |
|
* |
|
* This function disables the output polling work. |
|
* |
|
* Drivers can call this helper from their device suspend implementation. It is |
|
* not an error to call this even when output polling isn't enabled or already |
|
* disabled. Polling is re-enabled by calling drm_kms_helper_poll_enable(). |
|
* |
|
* Note that calls to enable and disable polling must be strictly ordered, which |
|
* is automatically the case when they're only call from suspend/resume |
|
* callbacks. |
|
*/ |
|
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); |
|
|
|
/** |
|
* drm_kms_helper_poll_init - initialize and enable output polling |
|
* @dev: drm_device |
|
* |
|
* This function initializes and then also enables output polling support for |
|
* @dev. Drivers which do not have reliable hotplug support in hardware can use |
|
* this helper infrastructure to regularly poll such connectors for changes in |
|
* their connection state. |
|
* |
|
* Drivers can control which connectors are polled by setting the |
|
* DRM_CONNECTOR_POLL_CONNECT and DRM_CONNECTOR_POLL_DISCONNECT flags. On |
|
* connectors where probing live outputs can result in visual distortion drivers |
|
* should not set the DRM_CONNECTOR_POLL_DISCONNECT flag to avoid this. |
|
* Connectors which have no flag or only DRM_CONNECTOR_POLL_HPD set are |
|
* completely ignored by the polling logic. |
|
* |
|
* Note that a connector can be both polled and probed from the hotplug handler, |
|
* in case the hotplug interrupt is known to be unreliable. |
|
*/ |
|
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); |
|
|
|
/** |
|
* drm_kms_helper_poll_fini - disable output polling and clean it up |
|
* @dev: drm_device |
|
*/ |
|
void drm_kms_helper_poll_fini(struct drm_device *dev) |
|
{ |
|
if (!dev->mode_config.poll_enabled) |
|
return; |
|
|
|
dev->mode_config.poll_enabled = false; |
|
cancel_delayed_work_sync(&dev->mode_config.output_poll_work); |
|
} |
|
EXPORT_SYMBOL(drm_kms_helper_poll_fini); |
|
|
|
static bool check_connector_changed(struct drm_connector *connector) |
|
{ |
|
struct drm_device *dev = connector->dev; |
|
enum drm_connector_status old_status; |
|
u64 old_epoch_counter; |
|
|
|
/* Only handle HPD capable connectors. */ |
|
drm_WARN_ON(dev, !(connector->polled & DRM_CONNECTOR_POLL_HPD)); |
|
|
|
drm_WARN_ON(dev, !mutex_is_locked(&dev->mode_config.mutex)); |
|
|
|
old_status = connector->status; |
|
old_epoch_counter = connector->epoch_counter; |
|
connector->status = drm_helper_probe_detect(connector, NULL, false); |
|
|
|
if (old_epoch_counter == connector->epoch_counter) { |
|
drm_dbg_kms(dev, "[CONNECTOR:%d:%s] Same epoch counter %llu\n", |
|
connector->base.id, |
|
connector->name, |
|
connector->epoch_counter); |
|
|
|
return false; |
|
} |
|
|
|
drm_dbg_kms(dev, "[CONNECTOR:%d:%s] status updated from %s to %s\n", |
|
connector->base.id, |
|
connector->name, |
|
drm_get_connector_status_name(old_status), |
|
drm_get_connector_status_name(connector->status)); |
|
|
|
drm_dbg_kms(dev, "[CONNECTOR:%d:%s] Changed epoch counter %llu => %llu\n", |
|
connector->base.id, |
|
connector->name, |
|
old_epoch_counter, |
|
connector->epoch_counter); |
|
|
|
return true; |
|
} |
|
|
|
/** |
|
* drm_connector_helper_hpd_irq_event - hotplug processing |
|
* @connector: drm_connector |
|
* |
|
* Drivers can use this helper function to run a detect cycle on a connector |
|
* which has the DRM_CONNECTOR_POLL_HPD flag set in its &polled member. |
|
* |
|
* This helper function is useful for drivers which can track hotplug |
|
* interrupts for a single connector. Drivers that want to send a |
|
* hotplug event for all connectors or can't track hotplug interrupts |
|
* per connector need to use drm_helper_hpd_irq_event(). |
|
* |
|
* This function must be called from process context with no mode |
|
* setting locks held. |
|
* |
|
* Note that a connector can be both polled and probed from the hotplug |
|
* handler, in case the hotplug interrupt is known to be unreliable. |
|
* |
|
* Returns: |
|
* A boolean indicating whether the connector status changed or not |
|
*/ |
|
bool drm_connector_helper_hpd_irq_event(struct drm_connector *connector) |
|
{ |
|
struct drm_device *dev = connector->dev; |
|
bool changed; |
|
|
|
mutex_lock(&dev->mode_config.mutex); |
|
changed = check_connector_changed(connector); |
|
mutex_unlock(&dev->mode_config.mutex); |
|
|
|
if (changed) { |
|
drm_kms_helper_connector_hotplug_event(connector); |
|
drm_dbg_kms(dev, "[CONNECTOR:%d:%s] Sent hotplug event\n", |
|
connector->base.id, |
|
connector->name); |
|
} |
|
|
|
return changed; |
|
} |
|
EXPORT_SYMBOL(drm_connector_helper_hpd_irq_event); |
|
|
|
/** |
|
* drm_helper_hpd_irq_event - hotplug processing |
|
* @dev: drm_device |
|
* |
|
* Drivers can use this helper function to run a detect cycle on all connectors |
|
* which have the DRM_CONNECTOR_POLL_HPD flag set in their &polled member. All |
|
* other connectors are ignored, which is useful to avoid reprobing fixed |
|
* panels. |
|
* |
|
* This helper function is useful for drivers which can't or don't track hotplug |
|
* interrupts for each connector. |
|
* |
|
* Drivers which support hotplug interrupts for each connector individually and |
|
* which have a more fine-grained detect logic can use |
|
* drm_connector_helper_hpd_irq_event(). Alternatively, they should bypass this |
|
* code and directly call drm_kms_helper_hotplug_event() in case the connector |
|
* state changed. |
|
* |
|
* This function must be called from process context with no mode |
|
* setting locks held. |
|
* |
|
* Note that a connector can be both polled and probed from the hotplug handler, |
|
* in case the hotplug interrupt is known to be unreliable. |
|
* |
|
* Returns: |
|
* A boolean indicating whether the connector status changed or not |
|
*/ |
|
bool drm_helper_hpd_irq_event(struct drm_device *dev) |
|
{ |
|
struct drm_connector *connector, *first_changed_connector = NULL; |
|
struct drm_connector_list_iter conn_iter; |
|
int changed = 0; |
|
|
|
if (!dev->mode_config.poll_enabled) |
|
return false; |
|
|
|
mutex_lock(&dev->mode_config.mutex); |
|
drm_connector_list_iter_begin(dev, &conn_iter); |
|
drm_for_each_connector_iter(connector, &conn_iter) { |
|
/* Only handle HPD capable connectors. */ |
|
if (!(connector->polled & DRM_CONNECTOR_POLL_HPD)) |
|
continue; |
|
|
|
if (check_connector_changed(connector)) { |
|
if (!first_changed_connector) { |
|
drm_connector_get(connector); |
|
first_changed_connector = connector; |
|
} |
|
|
|
changed++; |
|
} |
|
} |
|
drm_connector_list_iter_end(&conn_iter); |
|
mutex_unlock(&dev->mode_config.mutex); |
|
|
|
if (changed == 1) |
|
drm_kms_helper_connector_hotplug_event(first_changed_connector); |
|
else if (changed > 0) |
|
drm_kms_helper_hotplug_event(dev); |
|
|
|
if (first_changed_connector) |
|
drm_connector_put(first_changed_connector); |
|
|
|
return changed; |
|
} |
|
EXPORT_SYMBOL(drm_helper_hpd_irq_event);
|
|
|