![Jernej Skrabec](/assets/img/avatar_default.png)
A83T has DW HDMI IP block with a custom PHY similar to Synopsys gen2 HDMI PHY. Only video output was tested, while HW also supports audio and CEC. Support for them will be added later. Signed-off-by: Jernej Skrabec <jernej.skrabec@siol.net> Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com> Link: https://patchwork.freedesktop.org/patch/msgid/20180214200906.31509-11-jernej.skrabec@siol.net
197 lines
4.9 KiB
C
197 lines
4.9 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (c) 2018 Jernej Skrabec <jernej.skrabec@siol.net>
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*/
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#include <linux/component.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <drm/drm_of.h>
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#include <drm/drmP.h>
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#include <drm/drm_crtc_helper.h>
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#include "sun8i_dw_hdmi.h"
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static void sun8i_dw_hdmi_encoder_mode_set(struct drm_encoder *encoder,
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struct drm_display_mode *mode,
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struct drm_display_mode *adj_mode)
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{
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struct sun8i_dw_hdmi *hdmi = encoder_to_sun8i_dw_hdmi(encoder);
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clk_set_rate(hdmi->clk_tmds, mode->crtc_clock * 1000);
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}
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static const struct drm_encoder_helper_funcs
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sun8i_dw_hdmi_encoder_helper_funcs = {
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.mode_set = sun8i_dw_hdmi_encoder_mode_set,
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};
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static const struct drm_encoder_funcs sun8i_dw_hdmi_encoder_funcs = {
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.destroy = drm_encoder_cleanup,
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};
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static enum drm_mode_status
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sun8i_dw_hdmi_mode_valid(struct drm_connector *connector,
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const struct drm_display_mode *mode)
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{
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if (mode->clock > 297000)
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return MODE_CLOCK_HIGH;
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return MODE_OK;
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}
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static int sun8i_dw_hdmi_bind(struct device *dev, struct device *master,
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void *data)
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{
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struct platform_device *pdev = to_platform_device(dev);
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struct dw_hdmi_plat_data *plat_data;
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struct drm_device *drm = data;
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struct device_node *phy_node;
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struct drm_encoder *encoder;
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struct sun8i_dw_hdmi *hdmi;
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int ret;
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if (!pdev->dev.of_node)
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return -ENODEV;
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hdmi = devm_kzalloc(&pdev->dev, sizeof(*hdmi), GFP_KERNEL);
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if (!hdmi)
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return -ENOMEM;
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plat_data = &hdmi->plat_data;
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hdmi->dev = &pdev->dev;
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encoder = &hdmi->encoder;
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encoder->possible_crtcs = drm_of_find_possible_crtcs(drm, dev->of_node);
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/*
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* If we failed to find the CRTC(s) which this encoder is
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* supposed to be connected to, it's because the CRTC has
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* not been registered yet. Defer probing, and hope that
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* the required CRTC is added later.
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*/
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if (encoder->possible_crtcs == 0)
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return -EPROBE_DEFER;
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hdmi->rst_ctrl = devm_reset_control_get(dev, "ctrl");
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if (IS_ERR(hdmi->rst_ctrl)) {
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dev_err(dev, "Could not get ctrl reset control\n");
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return PTR_ERR(hdmi->rst_ctrl);
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}
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hdmi->clk_tmds = devm_clk_get(dev, "tmds");
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if (IS_ERR(hdmi->clk_tmds)) {
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dev_err(dev, "Couldn't get the tmds clock\n");
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return PTR_ERR(hdmi->clk_tmds);
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}
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ret = reset_control_deassert(hdmi->rst_ctrl);
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if (ret) {
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dev_err(dev, "Could not deassert ctrl reset control\n");
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return ret;
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}
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ret = clk_prepare_enable(hdmi->clk_tmds);
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if (ret) {
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dev_err(dev, "Could not enable tmds clock\n");
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goto err_assert_ctrl_reset;
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}
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phy_node = of_parse_phandle(dev->of_node, "phys", 0);
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if (!phy_node) {
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dev_err(dev, "Can't found PHY phandle\n");
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goto err_disable_clk_tmds;
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}
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ret = sun8i_hdmi_phy_probe(hdmi, phy_node);
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of_node_put(phy_node);
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if (ret) {
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dev_err(dev, "Couldn't get the HDMI PHY\n");
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goto err_disable_clk_tmds;
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}
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drm_encoder_helper_add(encoder, &sun8i_dw_hdmi_encoder_helper_funcs);
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drm_encoder_init(drm, encoder, &sun8i_dw_hdmi_encoder_funcs,
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DRM_MODE_ENCODER_TMDS, NULL);
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sun8i_hdmi_phy_init(hdmi->phy);
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plat_data->mode_valid = &sun8i_dw_hdmi_mode_valid;
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plat_data->phy_ops = sun8i_hdmi_phy_get_ops();
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plat_data->phy_name = "sun8i_dw_hdmi_phy";
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plat_data->phy_data = hdmi->phy;
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platform_set_drvdata(pdev, hdmi);
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hdmi->hdmi = dw_hdmi_bind(pdev, encoder, plat_data);
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/*
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* If dw_hdmi_bind() fails we'll never call dw_hdmi_unbind(),
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* which would have called the encoder cleanup. Do it manually.
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*/
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if (IS_ERR(hdmi->hdmi)) {
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ret = PTR_ERR(hdmi->hdmi);
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goto cleanup_encoder;
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}
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return 0;
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cleanup_encoder:
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drm_encoder_cleanup(encoder);
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sun8i_hdmi_phy_remove(hdmi);
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err_disable_clk_tmds:
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clk_disable_unprepare(hdmi->clk_tmds);
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err_assert_ctrl_reset:
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reset_control_assert(hdmi->rst_ctrl);
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return ret;
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}
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static void sun8i_dw_hdmi_unbind(struct device *dev, struct device *master,
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void *data)
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{
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struct sun8i_dw_hdmi *hdmi = dev_get_drvdata(dev);
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dw_hdmi_unbind(hdmi->hdmi);
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sun8i_hdmi_phy_remove(hdmi);
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clk_disable_unprepare(hdmi->clk_tmds);
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reset_control_assert(hdmi->rst_ctrl);
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}
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static const struct component_ops sun8i_dw_hdmi_ops = {
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.bind = sun8i_dw_hdmi_bind,
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.unbind = sun8i_dw_hdmi_unbind,
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};
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static int sun8i_dw_hdmi_probe(struct platform_device *pdev)
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{
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return component_add(&pdev->dev, &sun8i_dw_hdmi_ops);
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}
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static int sun8i_dw_hdmi_remove(struct platform_device *pdev)
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{
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component_del(&pdev->dev, &sun8i_dw_hdmi_ops);
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return 0;
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}
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static const struct of_device_id sun8i_dw_hdmi_dt_ids[] = {
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{ .compatible = "allwinner,sun8i-a83t-dw-hdmi" },
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{ /* sentinel */ },
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};
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MODULE_DEVICE_TABLE(of, sun8i_dw_hdmi_dt_ids);
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struct platform_driver sun8i_dw_hdmi_pltfm_driver = {
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.probe = sun8i_dw_hdmi_probe,
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.remove = sun8i_dw_hdmi_remove,
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.driver = {
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.name = "sun8i-dw-hdmi",
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.of_match_table = sun8i_dw_hdmi_dt_ids,
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},
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};
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module_platform_driver(sun8i_dw_hdmi_pltfm_driver);
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MODULE_AUTHOR("Jernej Skrabec <jernej.skrabec@siol.net>");
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MODULE_DESCRIPTION("Allwinner DW HDMI bridge");
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MODULE_LICENSE("GPL");
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