drivers/gpu/drm/arm/display/komeda/komeda_wb_connector.c

Source file repositories/reference/linux-study-clean/drivers/gpu/drm/arm/display/komeda/komeda_wb_connector.c

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/arm/display/komeda/komeda_wb_connector.c
Extension
.c
Size
5314 bytes
Lines
203
Domain
Driver Families
Bucket
drivers/gpu
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0
/*
 * (C) COPYRIGHT 2018 ARM Limited. All rights reserved.
 * Author: James.Qian.Wang <james.qian.wang@arm.com>
 *
 */
#include <drm/drm_framebuffer.h>
#include "komeda_dev.h"
#include "komeda_kms.h"

static int
komeda_wb_init_data_flow(struct komeda_layer *wb_layer,
			 struct drm_connector_state *conn_st,
			 struct komeda_crtc_state *kcrtc_st,
			 struct komeda_data_flow_cfg *dflow)
{
	struct drm_framebuffer *fb = conn_st->writeback_job->fb;

	memset(dflow, 0, sizeof(*dflow));

	dflow->out_w = fb->width;
	dflow->out_h = fb->height;

	/* the write back data comes from the compiz */
	pipeline_composition_size(kcrtc_st, &dflow->in_w, &dflow->in_h);
	dflow->input.component = &wb_layer->base.pipeline->compiz->base;
	/* compiz doesn't output alpha */
	dflow->pixel_blend_mode = DRM_MODE_BLEND_PIXEL_NONE;
	dflow->rot = DRM_MODE_ROTATE_0;

	komeda_complete_data_flow_cfg(wb_layer, dflow, fb);

	return 0;
}

static int
komeda_wb_encoder_atomic_check(struct drm_encoder *encoder,
			       struct drm_crtc_state *crtc_st,
			       struct drm_connector_state *conn_st)
{
	struct komeda_crtc_state *kcrtc_st = to_kcrtc_st(crtc_st);
	struct drm_writeback_job *writeback_job = conn_st->writeback_job;
	struct komeda_layer *wb_layer;
	struct komeda_data_flow_cfg dflow;
	int err;

	if (!writeback_job)
		return 0;

	if (!crtc_st->active) {
		DRM_DEBUG_ATOMIC("Cannot write the composition result out on a inactive CRTC.\n");
		return -EINVAL;
	}

	wb_layer = to_kconn(to_wb_conn(conn_st->connector))->wb_layer;

	/*
	 * No need for a full modested when the only connector changed is the
	 * writeback connector.
	 */
	if (crtc_st->connectors_changed &&
	    is_only_changed_connector(crtc_st, conn_st->connector))
		crtc_st->connectors_changed = false;

	err = komeda_wb_init_data_flow(wb_layer, conn_st, kcrtc_st, &dflow);
	if (err)
		return err;

	if (dflow.en_split)
		err = komeda_build_wb_split_data_flow(wb_layer,
				conn_st, kcrtc_st, &dflow);
	else
		err = komeda_build_wb_data_flow(wb_layer,
				conn_st, kcrtc_st, &dflow);

	return err;
}

static const struct drm_encoder_helper_funcs komeda_wb_encoder_helper_funcs = {
	.atomic_check = komeda_wb_encoder_atomic_check,
};

static int
komeda_wb_connector_get_modes(struct drm_connector *connector)
{
	return 0;
}

static enum drm_mode_status
komeda_wb_connector_mode_valid(struct drm_connector *connector,

Annotation

Implementation Notes