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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/drivers/gpu/drm/bridge/imx/imx-legacy-bridge.c
26517 views
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// SPDX-License-Identifier: GPL-2.0+

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/*

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 * Freescale i.MX drm driver

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 *

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 * bridge driver for legacy DT bindings, utilizing display-timings node

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 */

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#include <linux/export.h>

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#include <drm/drm_bridge.h>

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#include <drm/drm_modes.h>

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#include <drm/drm_probe_helper.h>

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#include <drm/bridge/imx.h>

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#include <video/of_display_timing.h>

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#include <video/of_videomode.h>

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struct imx_legacy_bridge {

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	struct drm_bridge base;

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	struct drm_display_mode mode;

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	u32 bus_flags;

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};

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#define to_imx_legacy_bridge(bridge)	container_of(bridge, struct imx_legacy_bridge, base)

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static int imx_legacy_bridge_attach(struct drm_bridge *bridge,

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				    struct drm_encoder *encoder,

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				    enum drm_bridge_attach_flags flags)

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{

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	if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR))

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		return -EINVAL;

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	return 0;

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}

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static int imx_legacy_bridge_get_modes(struct drm_bridge *bridge,

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				       struct drm_connector *connector)

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{

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	struct imx_legacy_bridge *imx_bridge = to_imx_legacy_bridge(bridge);

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	int ret;

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	ret = drm_connector_helper_get_modes_fixed(connector, &imx_bridge->mode);

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	if (ret)

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		return ret;

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	connector->display_info.bus_flags = imx_bridge->bus_flags;

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	return 0;

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}

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struct drm_bridge_funcs imx_legacy_bridge_funcs = {

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	.attach = imx_legacy_bridge_attach,

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	.get_modes = imx_legacy_bridge_get_modes,

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};

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struct drm_bridge *devm_imx_drm_legacy_bridge(struct device *dev,

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					      struct device_node *np,

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					      int type)

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{

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	struct imx_legacy_bridge *imx_bridge;

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	int ret;

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	imx_bridge = devm_drm_bridge_alloc(dev, struct imx_legacy_bridge,

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					   base, &imx_legacy_bridge_funcs);

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	if (IS_ERR(imx_bridge))

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		return ERR_CAST(imx_bridge);

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	ret = of_get_drm_display_mode(np,

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				      &imx_bridge->mode,

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				      &imx_bridge->bus_flags,

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				      OF_USE_NATIVE_MODE);

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	if (ret)

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		return ERR_PTR(ret);

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	imx_bridge->mode.type |= DRM_MODE_TYPE_DRIVER;

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	imx_bridge->base.of_node = np;

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	imx_bridge->base.ops = DRM_BRIDGE_OP_MODES;

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	imx_bridge->base.type = type;

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	ret = devm_drm_bridge_add(dev, &imx_bridge->base);

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	if (ret)

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		return ERR_PTR(ret);

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	return &imx_bridge->base;

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}

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EXPORT_SYMBOL_GPL(devm_imx_drm_legacy_bridge);

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MODULE_LICENSE("GPL");

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MODULE_DESCRIPTION("Freescale i.MX DRM bridge driver for legacy DT bindings");

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