1// SPDX-License-Identifier: GPL-2.0+
  2
  3/*
  4 * Copyright (C) 2022 Pengutronix, Lucas Stach <kernel@pengutronix.de>
  5 */
  6
  7#include <drm/drm_atomic_helper.h>
  8#include <drm/drm_bridge.h>
  9#include <drm/drm_crtc.h>
 10#include <linux/bitfield.h>
 11#include <linux/io.h>
 12#include <linux/module.h>
 13#include <linux/of.h>
 14#include <linux/of_graph.h>
 15#include <linux/platform_device.h>
 16#include <linux/pm_runtime.h>
 17
 18#define HTX_PVI_CTRL			0x0
 19#define  PVI_CTRL_OP_VSYNC_POL		BIT(18)
 20#define  PVI_CTRL_OP_HSYNC_POL		BIT(17)
 21#define  PVI_CTRL_OP_DE_POL		BIT(16)
 22#define  PVI_CTRL_INP_VSYNC_POL		BIT(14)
 23#define  PVI_CTRL_INP_HSYNC_POL		BIT(13)
 24#define  PVI_CTRL_INP_DE_POL		BIT(12)
 25#define  PVI_CTRL_MODE_MASK		GENMASK(2, 1)
 26#define  PVI_CTRL_MODE_LCDIF		2
 27#define  PVI_CTRL_EN			BIT(0)
 28
 29struct imx8mp_hdmi_pvi {
 30	struct drm_bridge	bridge;
 31	struct device		*dev;
 32	struct drm_bridge	*next_bridge;
 33	void __iomem		*regs;
 34};
 35
 36static inline struct imx8mp_hdmi_pvi *
 37to_imx8mp_hdmi_pvi(struct drm_bridge *bridge)
 38{
 39	return container_of(bridge, struct imx8mp_hdmi_pvi, bridge);
 40}
 41
 42static int imx8mp_hdmi_pvi_bridge_attach(struct drm_bridge *bridge,
 43					 enum drm_bridge_attach_flags flags)
 44{
 45	struct imx8mp_hdmi_pvi *pvi = to_imx8mp_hdmi_pvi(bridge);
 46
 47	return drm_bridge_attach(bridge->encoder, pvi->next_bridge,
 48				 bridge, flags);
 49}
 50
 51static void imx8mp_hdmi_pvi_bridge_enable(struct drm_bridge *bridge,
 52					  struct drm_bridge_state *bridge_state)
 53{
 54	struct drm_atomic_state *state = bridge_state->base.state;
 55	struct imx8mp_hdmi_pvi *pvi = to_imx8mp_hdmi_pvi(bridge);
 56	struct drm_connector_state *conn_state;
 57	const struct drm_display_mode *mode;
 58	struct drm_crtc_state *crtc_state;
 59	struct drm_connector *connector;
 60	u32 bus_flags = 0, val;
 61
 62	connector = drm_atomic_get_new_connector_for_encoder(state, bridge->encoder);
 63	conn_state = drm_atomic_get_new_connector_state(state, connector);
 64	crtc_state = drm_atomic_get_new_crtc_state(state, conn_state->crtc);
 65
 66	if (WARN_ON(pm_runtime_resume_and_get(pvi->dev)))
 67		return;
 68
 69	mode = &crtc_state->adjusted_mode;
 70
 71	val = FIELD_PREP(PVI_CTRL_MODE_MASK, PVI_CTRL_MODE_LCDIF) | PVI_CTRL_EN;
 72
 73	if (mode->flags & DRM_MODE_FLAG_PVSYNC)
 74		val |= PVI_CTRL_OP_VSYNC_POL | PVI_CTRL_INP_VSYNC_POL;
 75
 76	if (mode->flags & DRM_MODE_FLAG_PHSYNC)
 77		val |= PVI_CTRL_OP_HSYNC_POL | PVI_CTRL_INP_HSYNC_POL;
 78
 79	if (pvi->next_bridge->timings)
 80		bus_flags = pvi->next_bridge->timings->input_bus_flags;
 81	else if (bridge_state)
 82		bus_flags = bridge_state->input_bus_cfg.flags;
 83
 84	if (bus_flags & DRM_BUS_FLAG_DE_HIGH)
 85		val |= PVI_CTRL_OP_DE_POL | PVI_CTRL_INP_DE_POL;
 86
 87	writel(val, pvi->regs + HTX_PVI_CTRL);
 88}
 89
 90static void imx8mp_hdmi_pvi_bridge_disable(struct drm_bridge *bridge,
 91					   struct drm_bridge_state *bridge_state)
 92{
 93	struct imx8mp_hdmi_pvi *pvi = to_imx8mp_hdmi_pvi(bridge);
 94
 95	writel(0x0, pvi->regs + HTX_PVI_CTRL);
 96
 97	pm_runtime_put(pvi->dev);
 98}
 99
100static u32 *
101imx8mp_hdmi_pvi_bridge_get_input_bus_fmts(struct drm_bridge *bridge,
102					  struct drm_bridge_state *bridge_state,
103					  struct drm_crtc_state *crtc_state,
104					  struct drm_connector_state *conn_state,
105					  u32 output_fmt,
106					  unsigned int *num_input_fmts)
107{
108	struct imx8mp_hdmi_pvi *pvi = to_imx8mp_hdmi_pvi(bridge);
109	struct drm_bridge *next_bridge = pvi->next_bridge;
110	struct drm_bridge_state *next_state;
111
112	if (!next_bridge->funcs->atomic_get_input_bus_fmts)
113		return NULL;
114
115	next_state = drm_atomic_get_new_bridge_state(crtc_state->state,
116						     next_bridge);
117
118	return next_bridge->funcs->atomic_get_input_bus_fmts(next_bridge,
119							     next_state,
120							     crtc_state,
121							     conn_state,
122							     output_fmt,
123							     num_input_fmts);
124}
125
126static const struct drm_bridge_funcs imx_hdmi_pvi_bridge_funcs = {
127	.attach		= imx8mp_hdmi_pvi_bridge_attach,
128	.atomic_enable	= imx8mp_hdmi_pvi_bridge_enable,
129	.atomic_disable	= imx8mp_hdmi_pvi_bridge_disable,
130	.atomic_get_input_bus_fmts = imx8mp_hdmi_pvi_bridge_get_input_bus_fmts,
131	.atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
132	.atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
133	.atomic_reset = drm_atomic_helper_bridge_reset,
134};
135
136static int imx8mp_hdmi_pvi_probe(struct platform_device *pdev)
137{
138	struct device_node *remote;
139	struct imx8mp_hdmi_pvi *pvi;
140
141	pvi = devm_kzalloc(&pdev->dev, sizeof(*pvi), GFP_KERNEL);
142	if (!pvi)
143		return -ENOMEM;
144
145	platform_set_drvdata(pdev, pvi);
146	pvi->dev = &pdev->dev;
147
148	pvi->regs = devm_platform_ioremap_resource(pdev, 0);
149	if (IS_ERR(pvi->regs))
150		return PTR_ERR(pvi->regs);
151
152	/* Get the next bridge in the pipeline. */
153	remote = of_graph_get_remote_node(pdev->dev.of_node, 1, -1);
154	if (!remote)
155		return -EINVAL;
156
157	pvi->next_bridge = of_drm_find_bridge(remote);
158	of_node_put(remote);
159
160	if (!pvi->next_bridge)
161		return dev_err_probe(&pdev->dev, -EPROBE_DEFER,
162				     "could not find next bridge\n");
163
164	pm_runtime_enable(&pdev->dev);
165
166	/* Register the bridge. */
167	pvi->bridge.funcs = &imx_hdmi_pvi_bridge_funcs;
168	pvi->bridge.of_node = pdev->dev.of_node;
169	pvi->bridge.timings = pvi->next_bridge->timings;
170
171	drm_bridge_add(&pvi->bridge);
172
173	return 0;
174}
175
176static void imx8mp_hdmi_pvi_remove(struct platform_device *pdev)
177{
178	struct imx8mp_hdmi_pvi *pvi = platform_get_drvdata(pdev);
179
180	drm_bridge_remove(&pvi->bridge);
181
182	pm_runtime_disable(&pdev->dev);
183}
184
185static const struct of_device_id imx8mp_hdmi_pvi_match[] = {
186	{
187		.compatible = "fsl,imx8mp-hdmi-pvi",
188	}, {
189		/* sentinel */
190	}
191};
192MODULE_DEVICE_TABLE(of, imx8mp_hdmi_pvi_match);
193
194static struct platform_driver imx8mp_hdmi_pvi_driver = {
195	.probe	= imx8mp_hdmi_pvi_probe,
196	.remove = imx8mp_hdmi_pvi_remove,
197	.driver		= {
198		.name = "imx-hdmi-pvi",
199		.of_match_table	= imx8mp_hdmi_pvi_match,
200	},
201};
202module_platform_driver(imx8mp_hdmi_pvi_driver);
203
204MODULE_DESCRIPTION("i.MX8MP HDMI TX Parallel Video Interface bridge driver");
205MODULE_LICENSE("GPL");