1// SPDX-License-Identifier: GPL-2.0-only
  2
  3#include <drm/drm_atomic_helper.h>
  4#include <drm/drm_edid.h>
  5#include <drm/drm_modeset_helper_vtables.h>
  6#include <drm/drm_probe_helper.h>
  7
  8#include "mgag200_ddc.h"
  9#include "mgag200_drv.h"
 10
 11static void mgag200_vga_bmc_encoder_atomic_disable(struct drm_encoder *encoder,
 12						   struct drm_atomic_state *state)
 13{
 14	struct mga_device *mdev = to_mga_device(encoder->dev);
 15
 16	if (mdev->info->sync_bmc)
 17		mgag200_bmc_stop_scanout(mdev);
 18}
 19
 20static void mgag200_vga_bmc_encoder_atomic_enable(struct drm_encoder *encoder,
 21						  struct drm_atomic_state *state)
 22{
 23	struct mga_device *mdev = to_mga_device(encoder->dev);
 24
 25	if (mdev->info->sync_bmc)
 26		mgag200_bmc_start_scanout(mdev);
 27}
 28
 29static int mgag200_vga_bmc_encoder_atomic_check(struct drm_encoder *encoder,
 30						struct drm_crtc_state *new_crtc_state,
 31						struct drm_connector_state *new_connector_state)
 32{
 33	struct mga_device *mdev = to_mga_device(encoder->dev);
 34	struct mgag200_crtc_state *new_mgag200_crtc_state = to_mgag200_crtc_state(new_crtc_state);
 35
 36	new_mgag200_crtc_state->set_vidrst = mdev->info->sync_bmc;
 37
 38	return 0;
 39}
 40
 41static const struct drm_encoder_helper_funcs mgag200_dac_encoder_helper_funcs = {
 42	.atomic_disable = mgag200_vga_bmc_encoder_atomic_disable,
 43	.atomic_enable = mgag200_vga_bmc_encoder_atomic_enable,
 44	.atomic_check = mgag200_vga_bmc_encoder_atomic_check,
 45};
 46
 47static const struct drm_encoder_funcs mgag200_dac_encoder_funcs = {
 48	.destroy = drm_encoder_cleanup
 49};
 50
 51static int mgag200_vga_bmc_connector_helper_get_modes(struct drm_connector *connector)
 52{
 53	struct mga_device *mdev = to_mga_device(connector->dev);
 54	const struct mgag200_device_info *minfo = mdev->info;
 55	int count;
 56
 57	count = drm_connector_helper_get_modes(connector);
 58
 59	if (!count) {
 60		/*
 61		 * There's no EDID data without a connected monitor. Set BMC-
 62		 * compatible modes in this case. The XGA default resolution
 63		 * should work well for all BMCs.
 64		 */
 65		count = drm_add_modes_noedid(connector, minfo->max_hdisplay, minfo->max_vdisplay);
 66		if (count)
 67			drm_set_preferred_mode(connector, 1024, 768);
 68	}
 69
 70	return count;
 71}
 72
 73/*
 74 * There's no monitor connected if the DDC did not return an EDID. Still
 75 * return 'connected' as there's always a BMC. Incrementing the connector's
 76 * epoch counter triggers an update of the related properties.
 77 */
 78static int mgag200_vga_bmc_connector_helper_detect_ctx(struct drm_connector *connector,
 79						       struct drm_modeset_acquire_ctx *ctx,
 80						       bool force)
 81{
 82	enum drm_connector_status old_status, status;
 83
 84	if (connector->edid_blob_ptr)
 85		old_status = connector_status_connected;
 86	else
 87		old_status = connector_status_disconnected;
 88
 89	status = drm_connector_helper_detect_from_ddc(connector, ctx, force);
 90
 91	if (status != old_status)
 92		++connector->epoch_counter;
 93	return connector_status_connected;
 94}
 95
 96static const struct drm_connector_helper_funcs mgag200_vga_connector_helper_funcs = {
 97	.get_modes = mgag200_vga_bmc_connector_helper_get_modes,
 98	.detect_ctx = mgag200_vga_bmc_connector_helper_detect_ctx,
 99};
100
101static const struct drm_connector_funcs mgag200_vga_connector_funcs = {
102	.reset                  = drm_atomic_helper_connector_reset,
103	.fill_modes             = drm_helper_probe_single_connector_modes,
104	.destroy                = drm_connector_cleanup,
105	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
106	.atomic_destroy_state   = drm_atomic_helper_connector_destroy_state
107};
108
109int mgag200_vga_bmc_output_init(struct mga_device *mdev)
110{
111	struct drm_device *dev = &mdev->base;
112	struct drm_crtc *crtc = &mdev->crtc;
113	struct drm_encoder *encoder;
114	struct drm_connector *connector;
115	struct i2c_adapter *ddc;
116	int ret;
117
118	encoder = &mdev->output.vga.encoder;
119	ret = drm_encoder_init(dev, encoder, &mgag200_dac_encoder_funcs,
120			       DRM_MODE_ENCODER_DAC, NULL);
121	if (ret) {
122		drm_err(dev, "drm_encoder_init() failed: %d\n", ret);
123		return ret;
124	}
125	drm_encoder_helper_add(encoder, &mgag200_dac_encoder_helper_funcs);
126
127	encoder->possible_crtcs = drm_crtc_mask(crtc);
128
129	ddc = mgag200_ddc_create(mdev);
130	if (IS_ERR(ddc)) {
131		ret = PTR_ERR(ddc);
132		drm_err(dev, "failed to add DDC bus: %d\n", ret);
133		return ret;
134	}
135
136	connector = &mdev->output.vga.connector;
137	ret = drm_connector_init_with_ddc(dev, connector,
138					  &mgag200_vga_connector_funcs,
139					  DRM_MODE_CONNECTOR_VGA, ddc);
140	if (ret) {
141		drm_err(dev, "drm_connector_init_with_ddc() failed: %d\n", ret);
142		return ret;
143	}
144	drm_connector_helper_add(connector, &mgag200_vga_connector_helper_funcs);
145
146	connector->polled = DRM_CONNECTOR_POLL_CONNECT |
147			    DRM_CONNECTOR_POLL_DISCONNECT;
148
149	ret = drm_connector_attach_encoder(connector, encoder);
150	if (ret) {
151		drm_err(dev, "drm_connector_attach_encoder() failed: %d\n", ret);
152		return ret;
153	}
154
155	return 0;
156}