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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Copyright (C) 2011 Texas Instruments Incorporated - https://www.ti.com/4 * Author: Rob Clark <rob@ti.com>5 */6 7#include <linux/list.h>8 9#include <drm/drm_bridge.h>10#include <drm/drm_crtc.h>11#include <drm/drm_modeset_helper_vtables.h>12#include <drm/drm_edid.h>13 14#include "omap_drv.h"15 16/*17 * encoder funcs18 */19 20#define to_omap_encoder(x) container_of(x, struct omap_encoder, base)21 22/* The encoder and connector both map to same dssdev.. the encoder23 * handles the 'active' parts, ie. anything the modifies the state24 * of the hw, and the connector handles the 'read-only' parts, like25 * detecting connection and reading edid.26 */27struct omap_encoder {28	struct drm_encoder base;29	struct omap_dss_device *output;30};31 32static void omap_encoder_destroy(struct drm_encoder *encoder)33{34	struct omap_encoder *omap_encoder = to_omap_encoder(encoder);35 36	drm_encoder_cleanup(encoder);37	kfree(omap_encoder);38}39 40static const struct drm_encoder_funcs omap_encoder_funcs = {41	.destroy = omap_encoder_destroy,42};43 44static void omap_encoder_update_videomode_flags(struct videomode *vm,45						u32 bus_flags)46{47	if (!(vm->flags & (DISPLAY_FLAGS_DE_LOW |48			   DISPLAY_FLAGS_DE_HIGH))) {49		if (bus_flags & DRM_BUS_FLAG_DE_LOW)50			vm->flags |= DISPLAY_FLAGS_DE_LOW;51		else if (bus_flags & DRM_BUS_FLAG_DE_HIGH)52			vm->flags |= DISPLAY_FLAGS_DE_HIGH;53	}54 55	if (!(vm->flags & (DISPLAY_FLAGS_PIXDATA_POSEDGE |56			   DISPLAY_FLAGS_PIXDATA_NEGEDGE))) {57		if (bus_flags & DRM_BUS_FLAG_PIXDATA_DRIVE_POSEDGE)58			vm->flags |= DISPLAY_FLAGS_PIXDATA_POSEDGE;59		else if (bus_flags & DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE)60			vm->flags |= DISPLAY_FLAGS_PIXDATA_NEGEDGE;61	}62 63	if (!(vm->flags & (DISPLAY_FLAGS_SYNC_POSEDGE |64			   DISPLAY_FLAGS_SYNC_NEGEDGE))) {65		if (bus_flags & DRM_BUS_FLAG_SYNC_DRIVE_POSEDGE)66			vm->flags |= DISPLAY_FLAGS_SYNC_POSEDGE;67		else if (bus_flags & DRM_BUS_FLAG_SYNC_DRIVE_NEGEDGE)68			vm->flags |= DISPLAY_FLAGS_SYNC_NEGEDGE;69	}70}71 72static void omap_encoder_mode_set(struct drm_encoder *encoder,73				  struct drm_display_mode *mode,74				  struct drm_display_mode *adjusted_mode)75{76	struct omap_encoder *omap_encoder = to_omap_encoder(encoder);77	struct omap_dss_device *output = omap_encoder->output;78	struct drm_device *dev = encoder->dev;79	struct drm_connector *connector;80	struct drm_bridge *bridge;81	struct videomode vm = { 0 };82	u32 bus_flags;83 84	list_for_each_entry(connector, &dev->mode_config.connector_list, head) {85		if (connector->encoder == encoder)86			break;87	}88 89	drm_display_mode_to_videomode(adjusted_mode, &vm);90 91	/*92	 * HACK: This fixes the vm flags.93	 * struct drm_display_mode does not contain the VSYNC/HSYNC/DE flags and94	 * they get lost when converting back and forth between struct95	 * drm_display_mode and struct videomode. The hack below goes and96	 * fetches the missing flags.97	 *98	 * A better solution is to use DRM's bus-flags through the whole driver.99	 */100	for (bridge = output->bridge; bridge;101	     bridge = drm_bridge_get_next_bridge(bridge)) {102		if (!bridge->timings)103			continue;104 105		bus_flags = bridge->timings->input_bus_flags;106		omap_encoder_update_videomode_flags(&vm, bus_flags);107	}108 109	bus_flags = connector->display_info.bus_flags;110	omap_encoder_update_videomode_flags(&vm, bus_flags);111 112	/* Set timings for all devices in the display pipeline. */113	dss_mgr_set_timings(output, &vm);114}115 116static const struct drm_encoder_helper_funcs omap_encoder_helper_funcs = {117	.mode_set = omap_encoder_mode_set,118};119 120/* initialize encoder */121struct drm_encoder *omap_encoder_init(struct drm_device *dev,122				      struct omap_dss_device *output)123{124	struct drm_encoder *encoder = NULL;125	struct omap_encoder *omap_encoder;126 127	omap_encoder = kzalloc(sizeof(*omap_encoder), GFP_KERNEL);128	if (!omap_encoder)129		goto fail;130 131	omap_encoder->output = output;132 133	encoder = &omap_encoder->base;134 135	drm_encoder_init(dev, encoder, &omap_encoder_funcs,136			 DRM_MODE_ENCODER_TMDS, NULL);137	drm_encoder_helper_add(encoder, &omap_encoder_helper_funcs);138 139	return encoder;140 141fail:142	if (encoder)143		omap_encoder_destroy(encoder);144 145	return NULL;146}147