imx8mp-hdmi-pvi.c

  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					 struct drm_encoder *encoder,
 44					 enum drm_bridge_attach_flags flags)
 45{
 46	struct imx8mp_hdmi_pvi *pvi = to_imx8mp_hdmi_pvi(bridge);
 47
 48	return drm_bridge_attach(encoder, pvi->next_bridge,
 49				 bridge, flags);
 50}
 51
 52static void imx8mp_hdmi_pvi_bridge_enable(struct drm_bridge *bridge,
 53					  struct drm_atomic_state *state)
 54{
 55	struct imx8mp_hdmi_pvi *pvi = to_imx8mp_hdmi_pvi(bridge);
 56	struct drm_connector_state *conn_state;
 57	struct drm_bridge_state *bridge_state;
 58	const struct drm_display_mode *mode;
 59	struct drm_crtc_state *crtc_state;
 60	struct drm_connector *connector;
 61	u32 bus_flags = 0, val;
 62
 63	bridge_state = drm_atomic_get_new_bridge_state(state, bridge);
 64	connector = drm_atomic_get_new_connector_for_encoder(state, bridge->encoder);
 65	conn_state = drm_atomic_get_new_connector_state(state, connector);
 66	crtc_state = drm_atomic_get_new_crtc_state(state, conn_state->crtc);
 67
 68	if (WARN_ON(pm_runtime_resume_and_get(pvi->dev)))
 69		return;
 70
 71	mode = &crtc_state->adjusted_mode;
 72
 73	val = FIELD_PREP(PVI_CTRL_MODE_MASK, PVI_CTRL_MODE_LCDIF) | PVI_CTRL_EN;
 74
 75	if (mode->flags & DRM_MODE_FLAG_PVSYNC)
 76		val |= PVI_CTRL_OP_VSYNC_POL | PVI_CTRL_INP_VSYNC_POL;
 77
 78	if (mode->flags & DRM_MODE_FLAG_PHSYNC)
 79		val |= PVI_CTRL_OP_HSYNC_POL | PVI_CTRL_INP_HSYNC_POL;
 80
 81	if (pvi->next_bridge->timings)
 82		bus_flags = pvi->next_bridge->timings->input_bus_flags;
 83	else if (bridge_state)
 84		bus_flags = bridge_state->input_bus_cfg.flags;
 85
 86	if (bus_flags & DRM_BUS_FLAG_DE_HIGH)
 87		val |= PVI_CTRL_OP_DE_POL | PVI_CTRL_INP_DE_POL;
 88
 89	writel(val, pvi->regs + HTX_PVI_CTRL);
 90}
 91
 92static void imx8mp_hdmi_pvi_bridge_disable(struct drm_bridge *bridge,
 93					   struct drm_atomic_state *state)
 94{
 95	struct imx8mp_hdmi_pvi *pvi = to_imx8mp_hdmi_pvi(bridge);
 96
 97	writel(0x0, pvi->regs + HTX_PVI_CTRL);
 98
 99	pm_runtime_put(pvi->dev);
100}
101
102static u32 *
103imx8mp_hdmi_pvi_bridge_get_input_bus_fmts(struct drm_bridge *bridge,
104					  struct drm_bridge_state *bridge_state,
105					  struct drm_crtc_state *crtc_state,
106					  struct drm_connector_state *conn_state,
107					  u32 output_fmt,
108					  unsigned int *num_input_fmts)
109{
110	struct imx8mp_hdmi_pvi *pvi = to_imx8mp_hdmi_pvi(bridge);
111	struct drm_bridge *next_bridge = pvi->next_bridge;
112	struct drm_bridge_state *next_state;
113
114	if (!next_bridge->funcs->atomic_get_input_bus_fmts)
115		return NULL;
116
117	next_state = drm_atomic_get_new_bridge_state(crtc_state->state,
118						     next_bridge);
119
120	return next_bridge->funcs->atomic_get_input_bus_fmts(next_bridge,
121							     next_state,
122							     crtc_state,
123							     conn_state,
124							     output_fmt,
125							     num_input_fmts);
126}
127
128static const struct drm_bridge_funcs imx_hdmi_pvi_bridge_funcs = {
129	.attach		= imx8mp_hdmi_pvi_bridge_attach,
130	.atomic_enable	= imx8mp_hdmi_pvi_bridge_enable,
131	.atomic_disable	= imx8mp_hdmi_pvi_bridge_disable,
132	.atomic_get_input_bus_fmts = imx8mp_hdmi_pvi_bridge_get_input_bus_fmts,
133	.atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
134	.atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
135	.atomic_reset = drm_atomic_helper_bridge_reset,
136};
137
138static int imx8mp_hdmi_pvi_probe(struct platform_device *pdev)
139{
140	struct device_node *remote;
141	struct imx8mp_hdmi_pvi *pvi;
142
143	pvi = devm_drm_bridge_alloc(&pdev->dev, struct imx8mp_hdmi_pvi,
144				    bridge, &imx_hdmi_pvi_bridge_funcs);
145	if (IS_ERR(pvi))
146		return PTR_ERR(pvi);
147
148	platform_set_drvdata(pdev, pvi);
149	pvi->dev = &pdev->dev;
150
151	pvi->regs = devm_platform_ioremap_resource(pdev, 0);
152	if (IS_ERR(pvi->regs))
153		return PTR_ERR(pvi->regs);
154
155	/* Get the next bridge in the pipeline. */
156	remote = of_graph_get_remote_node(pdev->dev.of_node, 1, -1);
157	if (!remote)
158		return -EINVAL;
159
160	pvi->next_bridge = of_drm_find_bridge(remote);
161	of_node_put(remote);
162
163	if (!pvi->next_bridge)
164		return dev_err_probe(&pdev->dev, -EPROBE_DEFER,
165				     "could not find next bridge\n");
166
167	pm_runtime_enable(&pdev->dev);
168
169	/* Register the bridge. */
170	pvi->bridge.of_node = pdev->dev.of_node;
171	pvi->bridge.timings = pvi->next_bridge->timings;
172
173	drm_bridge_add(&pvi->bridge);
174
175	return 0;
176}
177
178static void imx8mp_hdmi_pvi_remove(struct platform_device *pdev)
179{
180	struct imx8mp_hdmi_pvi *pvi = platform_get_drvdata(pdev);
181
182	drm_bridge_remove(&pvi->bridge);
183
184	pm_runtime_disable(&pdev->dev);
185}
186
187static const struct of_device_id imx8mp_hdmi_pvi_match[] = {
188	{
189		.compatible = "fsl,imx8mp-hdmi-pvi",
190	}, {
191		/* sentinel */
192	}
193};
194MODULE_DEVICE_TABLE(of, imx8mp_hdmi_pvi_match);
195
196static struct platform_driver imx8mp_hdmi_pvi_driver = {
197	.probe	= imx8mp_hdmi_pvi_probe,
198	.remove = imx8mp_hdmi_pvi_remove,
199	.driver		= {
200		.name = "imx-hdmi-pvi",
201		.of_match_table	= imx8mp_hdmi_pvi_match,
202	},
203};
204module_platform_driver(imx8mp_hdmi_pvi_driver);
205
206MODULE_DESCRIPTION("i.MX8MP HDMI TX Parallel Video Interface bridge driver");
207MODULE_LICENSE("GPL");