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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/drivers/gpu/drm/ast/ast_vga.c
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// SPDX-License-Identifier: MIT

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#include <drm/drm_atomic_state_helper.h>

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#include <drm/drm_edid.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 "ast_ddc.h"

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#include "ast_drv.h"

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/*

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 * Encoder

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 */

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static const struct drm_encoder_funcs ast_vga_encoder_funcs = {

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	.destroy = drm_encoder_cleanup,

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};

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/*

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 * Connector

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 */

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static int ast_vga_connector_helper_get_modes(struct drm_connector *connector)

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{

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	struct ast_connector *ast_connector = to_ast_connector(connector);

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	int count;

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	if (ast_connector->physical_status == connector_status_connected) {

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		count = drm_connector_helper_get_modes(connector);

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	} else {

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		drm_edid_connector_update(connector, NULL);

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		/*

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		 * There's no EDID data without a connected monitor. Set BMC-

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		 * compatible modes in this case. The XGA default resolution

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		 * should work well for all BMCs.

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		 */

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		count = drm_add_modes_noedid(connector, 4096, 4096);

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		if (count)

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			drm_set_preferred_mode(connector, 1024, 768);

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	}

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	return count;

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}

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static int ast_vga_connector_helper_detect_ctx(struct drm_connector *connector,

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					       struct drm_modeset_acquire_ctx *ctx,

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					       bool force)

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{

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	struct ast_connector *ast_connector = to_ast_connector(connector);

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	enum drm_connector_status status;

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	status = drm_connector_helper_detect_from_ddc(connector, ctx, force);

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	if (status != ast_connector->physical_status)

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		++connector->epoch_counter;

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	ast_connector->physical_status = status;

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	return connector_status_connected;

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}

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static const struct drm_connector_helper_funcs ast_vga_connector_helper_funcs = {

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	.get_modes = ast_vga_connector_helper_get_modes,

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	.detect_ctx = ast_vga_connector_helper_detect_ctx,

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};

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static const struct drm_connector_funcs ast_vga_connector_funcs = {

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	.reset = drm_atomic_helper_connector_reset,

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	.fill_modes = drm_helper_probe_single_connector_modes,

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	.destroy = drm_connector_cleanup,

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	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,

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	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,

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};

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/*

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 * Output

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 */

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int ast_vga_output_init(struct ast_device *ast)

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{

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	struct drm_device *dev = &ast->base;

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	struct drm_crtc *crtc = &ast->crtc;

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	struct i2c_adapter *ddc;

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	struct drm_encoder *encoder;

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	struct ast_connector *ast_connector;

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	struct drm_connector *connector;

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	int ret;

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	/* DDC */

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	ddc = ast_ddc_create(ast);

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	if (IS_ERR(ddc))

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		return PTR_ERR(ddc);

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	/* encoder */

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	encoder = &ast->output.vga.encoder;

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	ret = drm_encoder_init(dev, encoder, &ast_vga_encoder_funcs,

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			       DRM_MODE_ENCODER_DAC, NULL);

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	if (ret)

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		return ret;

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	encoder->possible_crtcs = drm_crtc_mask(crtc);

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	/* connector */

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	ast_connector = &ast->output.vga.connector;

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	connector = &ast_connector->base;

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	ret = drm_connector_init_with_ddc(dev, connector, &ast_vga_connector_funcs,

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					  DRM_MODE_CONNECTOR_VGA, ddc);

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	if (ret)

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		return ret;

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	drm_connector_helper_add(connector, &ast_vga_connector_helper_funcs);

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	connector->interlace_allowed = 0;

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	connector->doublescan_allowed = 0;

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	connector->polled = DRM_CONNECTOR_POLL_CONNECT | DRM_CONNECTOR_POLL_DISCONNECT;

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	ast_connector->physical_status = connector->status;

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	ret = drm_connector_attach_encoder(connector, encoder);

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	if (ret)

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		return ret;

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	return 0;

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}

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