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
29 struct imx8mp_hdmi_pvi {
30 struct drm_bridge bridge;
31 struct device *dev;
32 struct drm_bridge *next_bridge;
33 void __iomem *regs;
34 };
35
36 static inline struct imx8mp_hdmi_pvi *
to_imx8mp_hdmi_pvi(struct drm_bridge * bridge)37 to_imx8mp_hdmi_pvi(struct drm_bridge *bridge)
38 {
39 return container_of(bridge, struct imx8mp_hdmi_pvi, bridge);
40 }
41
imx8mp_hdmi_pvi_bridge_attach(struct drm_bridge * bridge,struct drm_encoder * encoder,enum drm_bridge_attach_flags flags)42 static 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
imx8mp_hdmi_pvi_bridge_enable(struct drm_bridge * bridge,struct drm_atomic_state * state)52 static 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
imx8mp_hdmi_pvi_bridge_disable(struct drm_bridge * bridge,struct drm_atomic_state * state)92 static 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
102 static u32 *
imx8mp_hdmi_pvi_bridge_get_input_bus_fmts(struct drm_bridge * bridge,struct drm_bridge_state * bridge_state,struct drm_crtc_state * crtc_state,struct drm_connector_state * conn_state,u32 output_fmt,unsigned int * num_input_fmts)103 imx8mp_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
128 static 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
imx8mp_hdmi_pvi_probe(struct platform_device * pdev)138 static 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
imx8mp_hdmi_pvi_remove(struct platform_device * pdev)178 static 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
187 static const struct of_device_id imx8mp_hdmi_pvi_match[] = {
188 {
189 .compatible = "fsl,imx8mp-hdmi-pvi",
190 }, {
191 /* sentinel */
192 }
193 };
194 MODULE_DEVICE_TABLE(of, imx8mp_hdmi_pvi_match);
195
196 static 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 };
204 module_platform_driver(imx8mp_hdmi_pvi_driver);
205
206 MODULE_DESCRIPTION("i.MX8MP HDMI TX Parallel Video Interface bridge driver");
207 MODULE_LICENSE("GPL");
208