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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (c) 2018 Jernej Skrabec <jernej.skrabec@siol.net>
*/
#include <linux/component.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <drm/drm_of.h>
#include <drm/drmP.h>
#include <drm/drm_crtc_helper.h>
#include "sun8i_dw_hdmi.h"
#include "sun8i_tcon_top.h"
static void sun8i_dw_hdmi_encoder_mode_set(struct drm_encoder *encoder,
struct drm_display_mode *mode,
struct drm_display_mode *adj_mode)
{
struct sun8i_dw_hdmi *hdmi = encoder_to_sun8i_dw_hdmi(encoder);
clk_set_rate(hdmi->clk_tmds, mode->crtc_clock * 1000);
}
static const struct drm_encoder_helper_funcs
sun8i_dw_hdmi_encoder_helper_funcs = {
.mode_set = sun8i_dw_hdmi_encoder_mode_set,
};
static const struct drm_encoder_funcs sun8i_dw_hdmi_encoder_funcs = {
.destroy = drm_encoder_cleanup,
};
static enum drm_mode_status
sun8i_dw_hdmi_mode_valid(struct drm_connector *connector,
const struct drm_display_mode *mode)
{
if (mode->clock > 297000)
return MODE_CLOCK_HIGH;
return MODE_OK;
}
static bool sun8i_dw_hdmi_node_is_tcon_top(struct device_node *node)
{
return IS_ENABLED(CONFIG_DRM_SUN8I_TCON_TOP) &&
!!of_match_node(sun8i_tcon_top_of_table, node);
}
static u32 sun8i_dw_hdmi_find_possible_crtcs(struct drm_device *drm,
struct device_node *node)
{
struct device_node *port, *ep, *remote, *remote_port;
u32 crtcs = 0;
remote = of_graph_get_remote_node(node, 0, -1);
if (!remote)
return 0;
if (sun8i_dw_hdmi_node_is_tcon_top(remote)) {
port = of_graph_get_port_by_id(remote, 4);
if (!port)
goto crtcs_exit;
for_each_child_of_node(port, ep) {
remote_port = of_graph_get_remote_port(ep);
if (remote_port) {
crtcs |= drm_of_crtc_port_mask(drm, remote_port);
of_node_put(remote_port);
}
}
} else {
crtcs = drm_of_find_possible_crtcs(drm, node);
}
crtcs_exit:
of_node_put(remote);
return crtcs;
}
static int sun8i_dw_hdmi_bind(struct device *dev, struct device *master,
void *data)
{
struct platform_device *pdev = to_platform_device(dev);
struct dw_hdmi_plat_data *plat_data;
struct drm_device *drm = data;
struct device_node *phy_node;
struct drm_encoder *encoder;
struct sun8i_dw_hdmi *hdmi;
int ret;
if (!pdev->dev.of_node)
return -ENODEV;
hdmi = devm_kzalloc(&pdev->dev, sizeof(*hdmi), GFP_KERNEL);
if (!hdmi)
return -ENOMEM;
plat_data = &hdmi->plat_data;
hdmi->dev = &pdev->dev;
encoder = &hdmi->encoder;
encoder->possible_crtcs =
sun8i_dw_hdmi_find_possible_crtcs(drm, dev->of_node);
/*
* If we failed to find the CRTC(s) which this encoder is
* supposed to be connected to, it's because the CRTC has
* not been registered yet. Defer probing, and hope that
* the required CRTC is added later.
*/
if (encoder->possible_crtcs == 0)
return -EPROBE_DEFER;
hdmi->rst_ctrl = devm_reset_control_get(dev, "ctrl");
if (IS_ERR(hdmi->rst_ctrl)) {
dev_err(dev, "Could not get ctrl reset control\n");
return PTR_ERR(hdmi->rst_ctrl);
}
hdmi->clk_tmds = devm_clk_get(dev, "tmds");
if (IS_ERR(hdmi->clk_tmds)) {
dev_err(dev, "Couldn't get the tmds clock\n");
return PTR_ERR(hdmi->clk_tmds);
}
ret = reset_control_deassert(hdmi->rst_ctrl);
if (ret) {
dev_err(dev, "Could not deassert ctrl reset control\n");
return ret;
}
ret = clk_prepare_enable(hdmi->clk_tmds);
if (ret) {
dev_err(dev, "Could not enable tmds clock\n");
goto err_assert_ctrl_reset;
}
phy_node = of_parse_phandle(dev->of_node, "phys", 0);
if (!phy_node) {
dev_err(dev, "Can't found PHY phandle\n");
goto err_disable_clk_tmds;
}
ret = sun8i_hdmi_phy_probe(hdmi, phy_node);
of_node_put(phy_node);
if (ret) {
dev_err(dev, "Couldn't get the HDMI PHY\n");
goto err_disable_clk_tmds;
}
drm_encoder_helper_add(encoder, &sun8i_dw_hdmi_encoder_helper_funcs);
drm_encoder_init(drm, encoder, &sun8i_dw_hdmi_encoder_funcs,
DRM_MODE_ENCODER_TMDS, NULL);
sun8i_hdmi_phy_init(hdmi->phy);
plat_data->mode_valid = &sun8i_dw_hdmi_mode_valid;
plat_data->phy_ops = sun8i_hdmi_phy_get_ops();
plat_data->phy_name = "sun8i_dw_hdmi_phy";
plat_data->phy_data = hdmi->phy;
platform_set_drvdata(pdev, hdmi);
hdmi->hdmi = dw_hdmi_bind(pdev, encoder, plat_data);
/*
* If dw_hdmi_bind() fails we'll never call dw_hdmi_unbind(),
* which would have called the encoder cleanup. Do it manually.
*/
if (IS_ERR(hdmi->hdmi)) {
ret = PTR_ERR(hdmi->hdmi);
goto cleanup_encoder;
}
return 0;
cleanup_encoder:
drm_encoder_cleanup(encoder);
sun8i_hdmi_phy_remove(hdmi);
err_disable_clk_tmds:
clk_disable_unprepare(hdmi->clk_tmds);
err_assert_ctrl_reset:
reset_control_assert(hdmi->rst_ctrl);
return ret;
}
static void sun8i_dw_hdmi_unbind(struct device *dev, struct device *master,
void *data)
{
struct sun8i_dw_hdmi *hdmi = dev_get_drvdata(dev);
dw_hdmi_unbind(hdmi->hdmi);
sun8i_hdmi_phy_remove(hdmi);
clk_disable_unprepare(hdmi->clk_tmds);
reset_control_assert(hdmi->rst_ctrl);
}
static const struct component_ops sun8i_dw_hdmi_ops = {
.bind = sun8i_dw_hdmi_bind,
.unbind = sun8i_dw_hdmi_unbind,
};
static int sun8i_dw_hdmi_probe(struct platform_device *pdev)
{
return component_add(&pdev->dev, &sun8i_dw_hdmi_ops);
}
static int sun8i_dw_hdmi_remove(struct platform_device *pdev)
{
component_del(&pdev->dev, &sun8i_dw_hdmi_ops);
return 0;
}
static const struct of_device_id sun8i_dw_hdmi_dt_ids[] = {
{ .compatible = "allwinner,sun8i-a83t-dw-hdmi" },
{ /* sentinel */ },
};
MODULE_DEVICE_TABLE(of, sun8i_dw_hdmi_dt_ids);
static struct platform_driver sun8i_dw_hdmi_pltfm_driver = {
.probe = sun8i_dw_hdmi_probe,
.remove = sun8i_dw_hdmi_remove,
.driver = {
.name = "sun8i-dw-hdmi",
.of_match_table = sun8i_dw_hdmi_dt_ids,
},
};
module_platform_driver(sun8i_dw_hdmi_pltfm_driver);
MODULE_AUTHOR("Jernej Skrabec <jernej.skrabec@siol.net>");
MODULE_DESCRIPTION("Allwinner DW HDMI bridge");
MODULE_LICENSE("GPL");
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