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38d6fd406a
It's the default. Signed-off-by: Daniel Vetter <daniel.vetter@intel.com> Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Cc: Maxime Ripard <mripard@kernel.org> Cc: Thomas Zimmermann <tzimmermann@suse.de> Cc: David Airlie <airlied@linux.ie> Cc: Daniel Vetter <daniel@ffwll.ch> Reviewed-by: Michael J. Ruhl <michael.j.ruhl@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20200511091142.208787-1-daniel.vetter@ffwll.ch
419 lines
14 KiB
C
419 lines
14 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* (C) COPYRIGHT 2016 ARM Limited. All rights reserved.
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* Author: Brian Starkey <brian.starkey@arm.com>
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*
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* This program is free software and is provided to you under the terms of the
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* GNU General Public License version 2 as published by the Free Software
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* Foundation, and any use by you of this program is subject to the terms
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* of such GNU licence.
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*/
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#include <linux/dma-fence.h>
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#include <drm/drm_crtc.h>
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#include <drm/drm_device.h>
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#include <drm/drm_drv.h>
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#include <drm/drm_modeset_helper_vtables.h>
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#include <drm/drm_property.h>
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#include <drm/drm_writeback.h>
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/**
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* DOC: overview
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*
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* Writeback connectors are used to expose hardware which can write the output
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* from a CRTC to a memory buffer. They are used and act similarly to other
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* types of connectors, with some important differences:
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*
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* * Writeback connectors don't provide a way to output visually to the user.
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*
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* * Writeback connectors are visible to userspace only when the client sets
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* DRM_CLIENT_CAP_WRITEBACK_CONNECTORS.
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*
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* * Writeback connectors don't have EDID.
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*
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* A framebuffer may only be attached to a writeback connector when the
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* connector is attached to a CRTC. The WRITEBACK_FB_ID property which sets the
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* framebuffer applies only to a single commit (see below). A framebuffer may
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* not be attached while the CRTC is off.
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*
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* Unlike with planes, when a writeback framebuffer is removed by userspace DRM
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* makes no attempt to remove it from active use by the connector. This is
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* because no method is provided to abort a writeback operation, and in any
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* case making a new commit whilst a writeback is ongoing is undefined (see
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* WRITEBACK_OUT_FENCE_PTR below). As soon as the current writeback is finished,
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* the framebuffer will automatically no longer be in active use. As it will
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* also have already been removed from the framebuffer list, there will be no
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* way for any userspace application to retrieve a reference to it in the
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* intervening period.
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*
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* Writeback connectors have some additional properties, which userspace
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* can use to query and control them:
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*
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* "WRITEBACK_FB_ID":
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* Write-only object property storing a DRM_MODE_OBJECT_FB: it stores the
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* framebuffer to be written by the writeback connector. This property is
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* similar to the FB_ID property on planes, but will always read as zero
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* and is not preserved across commits.
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* Userspace must set this property to an output buffer every time it
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* wishes the buffer to get filled.
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*
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* "WRITEBACK_PIXEL_FORMATS":
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* Immutable blob property to store the supported pixel formats table. The
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* data is an array of u32 DRM_FORMAT_* fourcc values.
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* Userspace can use this blob to find out what pixel formats are supported
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* by the connector's writeback engine.
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*
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* "WRITEBACK_OUT_FENCE_PTR":
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* Userspace can use this property to provide a pointer for the kernel to
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* fill with a sync_file file descriptor, which will signal once the
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* writeback is finished. The value should be the address of a 32-bit
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* signed integer, cast to a u64.
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* Userspace should wait for this fence to signal before making another
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* commit affecting any of the same CRTCs, Planes or Connectors.
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* **Failure to do so will result in undefined behaviour.**
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* For this reason it is strongly recommended that all userspace
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* applications making use of writeback connectors *always* retrieve an
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* out-fence for the commit and use it appropriately.
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* From userspace, this property will always read as zero.
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*/
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#define fence_to_wb_connector(x) container_of(x->lock, \
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struct drm_writeback_connector, \
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fence_lock)
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static const char *drm_writeback_fence_get_driver_name(struct dma_fence *fence)
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{
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struct drm_writeback_connector *wb_connector =
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fence_to_wb_connector(fence);
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return wb_connector->base.dev->driver->name;
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}
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static const char *
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drm_writeback_fence_get_timeline_name(struct dma_fence *fence)
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{
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struct drm_writeback_connector *wb_connector =
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fence_to_wb_connector(fence);
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return wb_connector->timeline_name;
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}
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static bool drm_writeback_fence_enable_signaling(struct dma_fence *fence)
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{
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return true;
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}
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static const struct dma_fence_ops drm_writeback_fence_ops = {
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.get_driver_name = drm_writeback_fence_get_driver_name,
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.get_timeline_name = drm_writeback_fence_get_timeline_name,
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.enable_signaling = drm_writeback_fence_enable_signaling,
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};
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static int create_writeback_properties(struct drm_device *dev)
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{
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struct drm_property *prop;
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if (!dev->mode_config.writeback_fb_id_property) {
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prop = drm_property_create_object(dev, DRM_MODE_PROP_ATOMIC,
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"WRITEBACK_FB_ID",
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DRM_MODE_OBJECT_FB);
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if (!prop)
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return -ENOMEM;
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dev->mode_config.writeback_fb_id_property = prop;
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}
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if (!dev->mode_config.writeback_pixel_formats_property) {
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prop = drm_property_create(dev, DRM_MODE_PROP_BLOB |
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DRM_MODE_PROP_ATOMIC |
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DRM_MODE_PROP_IMMUTABLE,
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"WRITEBACK_PIXEL_FORMATS", 0);
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if (!prop)
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return -ENOMEM;
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dev->mode_config.writeback_pixel_formats_property = prop;
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}
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if (!dev->mode_config.writeback_out_fence_ptr_property) {
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prop = drm_property_create_range(dev, DRM_MODE_PROP_ATOMIC,
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"WRITEBACK_OUT_FENCE_PTR", 0,
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U64_MAX);
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if (!prop)
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return -ENOMEM;
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dev->mode_config.writeback_out_fence_ptr_property = prop;
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}
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return 0;
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}
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static const struct drm_encoder_funcs drm_writeback_encoder_funcs = {
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.destroy = drm_encoder_cleanup,
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};
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/**
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* drm_writeback_connector_init - Initialize a writeback connector and its properties
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* @dev: DRM device
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* @wb_connector: Writeback connector to initialize
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* @con_funcs: Connector funcs vtable
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* @enc_helper_funcs: Encoder helper funcs vtable to be used by the internal encoder
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* @formats: Array of supported pixel formats for the writeback engine
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* @n_formats: Length of the formats array
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*
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* This function creates the writeback-connector-specific properties if they
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* have not been already created, initializes the connector as
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* type DRM_MODE_CONNECTOR_WRITEBACK, and correctly initializes the property
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* values. It will also create an internal encoder associated with the
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* drm_writeback_connector and set it to use the @enc_helper_funcs vtable for
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* the encoder helper.
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*
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* Drivers should always use this function instead of drm_connector_init() to
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* set up writeback connectors.
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*
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* Returns: 0 on success, or a negative error code
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*/
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int drm_writeback_connector_init(struct drm_device *dev,
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struct drm_writeback_connector *wb_connector,
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const struct drm_connector_funcs *con_funcs,
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const struct drm_encoder_helper_funcs *enc_helper_funcs,
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const u32 *formats, int n_formats)
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{
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struct drm_property_blob *blob;
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struct drm_connector *connector = &wb_connector->base;
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struct drm_mode_config *config = &dev->mode_config;
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int ret = create_writeback_properties(dev);
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if (ret != 0)
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return ret;
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blob = drm_property_create_blob(dev, n_formats * sizeof(*formats),
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formats);
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if (IS_ERR(blob))
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return PTR_ERR(blob);
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drm_encoder_helper_add(&wb_connector->encoder, enc_helper_funcs);
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ret = drm_encoder_init(dev, &wb_connector->encoder,
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&drm_writeback_encoder_funcs,
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DRM_MODE_ENCODER_VIRTUAL, NULL);
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if (ret)
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goto fail;
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connector->interlace_allowed = 0;
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ret = drm_connector_init(dev, connector, con_funcs,
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DRM_MODE_CONNECTOR_WRITEBACK);
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if (ret)
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goto connector_fail;
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ret = drm_connector_attach_encoder(connector,
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&wb_connector->encoder);
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if (ret)
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goto attach_fail;
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INIT_LIST_HEAD(&wb_connector->job_queue);
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spin_lock_init(&wb_connector->job_lock);
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wb_connector->fence_context = dma_fence_context_alloc(1);
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spin_lock_init(&wb_connector->fence_lock);
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snprintf(wb_connector->timeline_name,
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sizeof(wb_connector->timeline_name),
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"CONNECTOR:%d-%s", connector->base.id, connector->name);
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drm_object_attach_property(&connector->base,
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config->writeback_out_fence_ptr_property, 0);
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drm_object_attach_property(&connector->base,
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config->writeback_fb_id_property, 0);
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drm_object_attach_property(&connector->base,
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config->writeback_pixel_formats_property,
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blob->base.id);
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wb_connector->pixel_formats_blob_ptr = blob;
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return 0;
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attach_fail:
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drm_connector_cleanup(connector);
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connector_fail:
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drm_encoder_cleanup(&wb_connector->encoder);
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fail:
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drm_property_blob_put(blob);
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return ret;
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}
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EXPORT_SYMBOL(drm_writeback_connector_init);
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int drm_writeback_set_fb(struct drm_connector_state *conn_state,
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struct drm_framebuffer *fb)
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{
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WARN_ON(conn_state->connector->connector_type != DRM_MODE_CONNECTOR_WRITEBACK);
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if (!conn_state->writeback_job) {
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conn_state->writeback_job =
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kzalloc(sizeof(*conn_state->writeback_job), GFP_KERNEL);
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if (!conn_state->writeback_job)
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return -ENOMEM;
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conn_state->writeback_job->connector =
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drm_connector_to_writeback(conn_state->connector);
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}
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drm_framebuffer_assign(&conn_state->writeback_job->fb, fb);
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return 0;
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}
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int drm_writeback_prepare_job(struct drm_writeback_job *job)
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{
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struct drm_writeback_connector *connector = job->connector;
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const struct drm_connector_helper_funcs *funcs =
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connector->base.helper_private;
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int ret;
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if (funcs->prepare_writeback_job) {
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ret = funcs->prepare_writeback_job(connector, job);
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if (ret < 0)
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return ret;
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}
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job->prepared = true;
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return 0;
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}
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EXPORT_SYMBOL(drm_writeback_prepare_job);
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/**
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* drm_writeback_queue_job - Queue a writeback job for later signalling
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* @wb_connector: The writeback connector to queue a job on
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* @conn_state: The connector state containing the job to queue
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*
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* This function adds the job contained in @conn_state to the job_queue for a
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* writeback connector. It takes ownership of the writeback job and sets the
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* @conn_state->writeback_job to NULL, and so no access to the job may be
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* performed by the caller after this function returns.
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*
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* Drivers must ensure that for a given writeback connector, jobs are queued in
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* exactly the same order as they will be completed by the hardware (and
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* signaled via drm_writeback_signal_completion).
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*
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* For every call to drm_writeback_queue_job() there must be exactly one call to
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* drm_writeback_signal_completion()
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*
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* See also: drm_writeback_signal_completion()
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*/
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void drm_writeback_queue_job(struct drm_writeback_connector *wb_connector,
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struct drm_connector_state *conn_state)
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{
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struct drm_writeback_job *job;
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unsigned long flags;
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job = conn_state->writeback_job;
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conn_state->writeback_job = NULL;
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spin_lock_irqsave(&wb_connector->job_lock, flags);
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list_add_tail(&job->list_entry, &wb_connector->job_queue);
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spin_unlock_irqrestore(&wb_connector->job_lock, flags);
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}
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EXPORT_SYMBOL(drm_writeback_queue_job);
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void drm_writeback_cleanup_job(struct drm_writeback_job *job)
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{
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struct drm_writeback_connector *connector = job->connector;
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const struct drm_connector_helper_funcs *funcs =
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connector->base.helper_private;
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if (job->prepared && funcs->cleanup_writeback_job)
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funcs->cleanup_writeback_job(connector, job);
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if (job->fb)
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drm_framebuffer_put(job->fb);
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if (job->out_fence)
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dma_fence_put(job->out_fence);
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kfree(job);
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}
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EXPORT_SYMBOL(drm_writeback_cleanup_job);
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/*
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* @cleanup_work: deferred cleanup of a writeback job
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*
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* The job cannot be cleaned up directly in drm_writeback_signal_completion,
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* because it may be called in interrupt context. Dropping the framebuffer
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* reference can sleep, and so the cleanup is deferred to a workqueue.
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*/
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static void cleanup_work(struct work_struct *work)
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{
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struct drm_writeback_job *job = container_of(work,
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struct drm_writeback_job,
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cleanup_work);
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drm_writeback_cleanup_job(job);
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}
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/**
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* drm_writeback_signal_completion - Signal the completion of a writeback job
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* @wb_connector: The writeback connector whose job is complete
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* @status: Status code to set in the writeback out_fence (0 for success)
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*
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* Drivers should call this to signal the completion of a previously queued
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* writeback job. It should be called as soon as possible after the hardware
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* has finished writing, and may be called from interrupt context.
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* It is the driver's responsibility to ensure that for a given connector, the
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* hardware completes writeback jobs in the same order as they are queued.
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*
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* Unless the driver is holding its own reference to the framebuffer, it must
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* not be accessed after calling this function.
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*
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* See also: drm_writeback_queue_job()
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*/
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void
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drm_writeback_signal_completion(struct drm_writeback_connector *wb_connector,
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int status)
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{
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unsigned long flags;
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struct drm_writeback_job *job;
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struct dma_fence *out_fence;
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spin_lock_irqsave(&wb_connector->job_lock, flags);
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job = list_first_entry_or_null(&wb_connector->job_queue,
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struct drm_writeback_job,
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list_entry);
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if (job)
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list_del(&job->list_entry);
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spin_unlock_irqrestore(&wb_connector->job_lock, flags);
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if (WARN_ON(!job))
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return;
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out_fence = job->out_fence;
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if (out_fence) {
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if (status)
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dma_fence_set_error(out_fence, status);
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dma_fence_signal(out_fence);
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dma_fence_put(out_fence);
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job->out_fence = NULL;
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}
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INIT_WORK(&job->cleanup_work, cleanup_work);
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queue_work(system_long_wq, &job->cleanup_work);
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}
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EXPORT_SYMBOL(drm_writeback_signal_completion);
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struct dma_fence *
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drm_writeback_get_out_fence(struct drm_writeback_connector *wb_connector)
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{
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struct dma_fence *fence;
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if (WARN_ON(wb_connector->base.connector_type !=
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DRM_MODE_CONNECTOR_WRITEBACK))
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return NULL;
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fence = kzalloc(sizeof(*fence), GFP_KERNEL);
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if (!fence)
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return NULL;
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dma_fence_init(fence, &drm_writeback_fence_ops,
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&wb_connector->fence_lock, wb_connector->fence_context,
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++wb_connector->fence_seqno);
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return fence;
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}
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EXPORT_SYMBOL(drm_writeback_get_out_fence);
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