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- // SPDX-License-Identifier: GPL-2.0-only
- /*
- * Exynos DRM Parallel output support.
- *
- * Copyright (c) 2014 Samsung Electronics Co., Ltd
- *
- * Contacts: Andrzej Hajda <a.hajda@samsung.com>
- */
- #include <linux/of_graph.h>
- #include <linux/regulator/consumer.h>
- #include <drm/drm_atomic_helper.h>
- #include <drm/drm_panel.h>
- #include <drm/drm_print.h>
- #include <drm/drm_probe_helper.h>
- #include <drm/drm_simple_kms_helper.h>
- #include <video/of_videomode.h>
- #include <video/videomode.h>
- #include "exynos_drm_crtc.h"
- struct exynos_dpi {
- struct drm_encoder encoder;
- struct device *dev;
- struct device_node *panel_node;
- struct drm_panel *panel;
- struct drm_connector connector;
- struct videomode *vm;
- };
- #define connector_to_dpi(c) container_of(c, struct exynos_dpi, connector)
- static inline struct exynos_dpi *encoder_to_dpi(struct drm_encoder *e)
- {
- return container_of(e, struct exynos_dpi, encoder);
- }
- static enum drm_connector_status
- exynos_dpi_detect(struct drm_connector *connector, bool force)
- {
- return connector_status_connected;
- }
- static void exynos_dpi_connector_destroy(struct drm_connector *connector)
- {
- drm_connector_unregister(connector);
- drm_connector_cleanup(connector);
- }
- static const struct drm_connector_funcs exynos_dpi_connector_funcs = {
- .detect = exynos_dpi_detect,
- .fill_modes = drm_helper_probe_single_connector_modes,
- .destroy = exynos_dpi_connector_destroy,
- .reset = drm_atomic_helper_connector_reset,
- .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
- .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
- };
- static int exynos_dpi_get_modes(struct drm_connector *connector)
- {
- struct exynos_dpi *ctx = connector_to_dpi(connector);
- /* fimd timings gets precedence over panel modes */
- if (ctx->vm) {
- struct drm_display_mode *mode;
- mode = drm_mode_create(connector->dev);
- if (!mode) {
- DRM_DEV_ERROR(ctx->dev,
- "failed to create a new display mode\n");
- return 0;
- }
- drm_display_mode_from_videomode(ctx->vm, mode);
- mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
- drm_mode_probed_add(connector, mode);
- return 1;
- }
- if (ctx->panel)
- return drm_panel_get_modes(ctx->panel, connector);
- return 0;
- }
- static const struct drm_connector_helper_funcs exynos_dpi_connector_helper_funcs = {
- .get_modes = exynos_dpi_get_modes,
- };
- static int exynos_dpi_create_connector(struct drm_encoder *encoder)
- {
- struct exynos_dpi *ctx = encoder_to_dpi(encoder);
- struct drm_connector *connector = &ctx->connector;
- int ret;
- connector->polled = DRM_CONNECTOR_POLL_HPD;
- ret = drm_connector_init(encoder->dev, connector,
- &exynos_dpi_connector_funcs,
- DRM_MODE_CONNECTOR_VGA);
- if (ret) {
- DRM_DEV_ERROR(ctx->dev,
- "failed to initialize connector with drm\n");
- return ret;
- }
- drm_connector_helper_add(connector, &exynos_dpi_connector_helper_funcs);
- drm_connector_attach_encoder(connector, encoder);
- return 0;
- }
- static void exynos_dpi_mode_set(struct drm_encoder *encoder,
- struct drm_display_mode *mode,
- struct drm_display_mode *adjusted_mode)
- {
- }
- static void exynos_dpi_enable(struct drm_encoder *encoder)
- {
- struct exynos_dpi *ctx = encoder_to_dpi(encoder);
- if (ctx->panel) {
- drm_panel_prepare(ctx->panel);
- drm_panel_enable(ctx->panel);
- }
- }
- static void exynos_dpi_disable(struct drm_encoder *encoder)
- {
- struct exynos_dpi *ctx = encoder_to_dpi(encoder);
- if (ctx->panel) {
- drm_panel_disable(ctx->panel);
- drm_panel_unprepare(ctx->panel);
- }
- }
- static const struct drm_encoder_helper_funcs exynos_dpi_encoder_helper_funcs = {
- .mode_set = exynos_dpi_mode_set,
- .enable = exynos_dpi_enable,
- .disable = exynos_dpi_disable,
- };
- enum {
- FIMD_PORT_IN0,
- FIMD_PORT_IN1,
- FIMD_PORT_IN2,
- FIMD_PORT_RGB,
- FIMD_PORT_WRB,
- };
- static int exynos_dpi_parse_dt(struct exynos_dpi *ctx)
- {
- struct device *dev = ctx->dev;
- struct device_node *dn = dev->of_node;
- struct device_node *np;
- ctx->panel_node = of_graph_get_remote_node(dn, FIMD_PORT_RGB, 0);
- np = of_get_child_by_name(dn, "display-timings");
- if (np) {
- struct videomode *vm;
- int ret;
- of_node_put(np);
- vm = devm_kzalloc(dev, sizeof(*ctx->vm), GFP_KERNEL);
- if (!vm)
- return -ENOMEM;
- ret = of_get_videomode(dn, vm, 0);
- if (ret < 0) {
- devm_kfree(dev, vm);
- return ret;
- }
- ctx->vm = vm;
- return 0;
- }
- if (!ctx->panel_node)
- return -EINVAL;
- return 0;
- }
- int exynos_dpi_bind(struct drm_device *dev, struct drm_encoder *encoder)
- {
- int ret;
- drm_simple_encoder_init(dev, encoder, DRM_MODE_ENCODER_TMDS);
- drm_encoder_helper_add(encoder, &exynos_dpi_encoder_helper_funcs);
- ret = exynos_drm_set_possible_crtcs(encoder, EXYNOS_DISPLAY_TYPE_LCD);
- if (ret < 0)
- return ret;
- ret = exynos_dpi_create_connector(encoder);
- if (ret) {
- DRM_DEV_ERROR(encoder_to_dpi(encoder)->dev,
- "failed to create connector ret = %d\n", ret);
- drm_encoder_cleanup(encoder);
- return ret;
- }
- return 0;
- }
- struct drm_encoder *exynos_dpi_probe(struct device *dev)
- {
- struct exynos_dpi *ctx;
- int ret;
- ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
- if (!ctx)
- return ERR_PTR(-ENOMEM);
- ctx->dev = dev;
- ret = exynos_dpi_parse_dt(ctx);
- if (ret < 0) {
- devm_kfree(dev, ctx);
- return NULL;
- }
- if (ctx->panel_node) {
- ctx->panel = of_drm_find_panel(ctx->panel_node);
- if (IS_ERR(ctx->panel))
- return ERR_CAST(ctx->panel);
- }
- return &ctx->encoder;
- }
- int exynos_dpi_remove(struct drm_encoder *encoder)
- {
- struct exynos_dpi *ctx = encoder_to_dpi(encoder);
- exynos_dpi_disable(&ctx->encoder);
- return 0;
- }
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