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,enum drm_bridge_attach_flags flags)42 static 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
imx8mp_hdmi_pvi_bridge_enable(struct drm_bridge * bridge,struct drm_atomic_state * state)51 static void imx8mp_hdmi_pvi_bridge_enable(struct drm_bridge *bridge,
52 struct drm_atomic_state *state)
53 {
54 struct imx8mp_hdmi_pvi *pvi = to_imx8mp_hdmi_pvi(bridge);
55 struct drm_connector_state *conn_state;
56 struct drm_bridge_state *bridge_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 bridge_state = drm_atomic_get_new_bridge_state(state, bridge);
63 connector = drm_atomic_get_new_connector_for_encoder(state, bridge->encoder);
64 conn_state = drm_atomic_get_new_connector_state(state, connector);
65 crtc_state = drm_atomic_get_new_crtc_state(state, conn_state->crtc);
66
67 if (WARN_ON(pm_runtime_resume_and_get(pvi->dev)))
68 return;
69
70 mode = &crtc_state->adjusted_mode;
71
72 val = FIELD_PREP(PVI_CTRL_MODE_MASK, PVI_CTRL_MODE_LCDIF) | PVI_CTRL_EN;
73
74 if (mode->flags & DRM_MODE_FLAG_PVSYNC)
75 val |= PVI_CTRL_OP_VSYNC_POL | PVI_CTRL_INP_VSYNC_POL;
76
77 if (mode->flags & DRM_MODE_FLAG_PHSYNC)
78 val |= PVI_CTRL_OP_HSYNC_POL | PVI_CTRL_INP_HSYNC_POL;
79
80 if (pvi->next_bridge->timings)
81 bus_flags = pvi->next_bridge->timings->input_bus_flags;
82 else if (bridge_state)
83 bus_flags = bridge_state->input_bus_cfg.flags;
84
85 if (bus_flags & DRM_BUS_FLAG_DE_HIGH)
86 val |= PVI_CTRL_OP_DE_POL | PVI_CTRL_INP_DE_POL;
87
88 writel(val, pvi->regs + HTX_PVI_CTRL);
89 }
90
imx8mp_hdmi_pvi_bridge_disable(struct drm_bridge * bridge,struct drm_atomic_state * state)91 static void imx8mp_hdmi_pvi_bridge_disable(struct drm_bridge *bridge,
92 struct drm_atomic_state *state)
93 {
94 struct imx8mp_hdmi_pvi *pvi = to_imx8mp_hdmi_pvi(bridge);
95
96 writel(0x0, pvi->regs + HTX_PVI_CTRL);
97
98 pm_runtime_put(pvi->dev);
99 }
100
101 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)102 imx8mp_hdmi_pvi_bridge_get_input_bus_fmts(struct drm_bridge *bridge,
103 struct drm_bridge_state *bridge_state,
104 struct drm_crtc_state *crtc_state,
105 struct drm_connector_state *conn_state,
106 u32 output_fmt,
107 unsigned int *num_input_fmts)
108 {
109 struct imx8mp_hdmi_pvi *pvi = to_imx8mp_hdmi_pvi(bridge);
110 struct drm_bridge *next_bridge = pvi->next_bridge;
111 struct drm_bridge_state *next_state;
112
113 if (!next_bridge->funcs->atomic_get_input_bus_fmts)
114 return NULL;
115
116 next_state = drm_atomic_get_new_bridge_state(crtc_state->state,
117 next_bridge);
118
119 return next_bridge->funcs->atomic_get_input_bus_fmts(next_bridge,
120 next_state,
121 crtc_state,
122 conn_state,
123 output_fmt,
124 num_input_fmts);
125 }
126
127 static const struct drm_bridge_funcs imx_hdmi_pvi_bridge_funcs = {
128 .attach = imx8mp_hdmi_pvi_bridge_attach,
129 .atomic_enable = imx8mp_hdmi_pvi_bridge_enable,
130 .atomic_disable = imx8mp_hdmi_pvi_bridge_disable,
131 .atomic_get_input_bus_fmts = imx8mp_hdmi_pvi_bridge_get_input_bus_fmts,
132 .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
133 .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
134 .atomic_reset = drm_atomic_helper_bridge_reset,
135 };
136
imx8mp_hdmi_pvi_probe(struct platform_device * pdev)137 static int imx8mp_hdmi_pvi_probe(struct platform_device *pdev)
138 {
139 struct device_node *remote;
140 struct imx8mp_hdmi_pvi *pvi;
141
142 pvi = devm_kzalloc(&pdev->dev, sizeof(*pvi), GFP_KERNEL);
143 if (!pvi)
144 return -ENOMEM;
145
146 platform_set_drvdata(pdev, pvi);
147 pvi->dev = &pdev->dev;
148
149 pvi->regs = devm_platform_ioremap_resource(pdev, 0);
150 if (IS_ERR(pvi->regs))
151 return PTR_ERR(pvi->regs);
152
153 /* Get the next bridge in the pipeline. */
154 remote = of_graph_get_remote_node(pdev->dev.of_node, 1, -1);
155 if (!remote)
156 return -EINVAL;
157
158 pvi->next_bridge = of_drm_find_bridge(remote);
159 of_node_put(remote);
160
161 if (!pvi->next_bridge)
162 return dev_err_probe(&pdev->dev, -EPROBE_DEFER,
163 "could not find next bridge\n");
164
165 pm_runtime_enable(&pdev->dev);
166
167 /* Register the bridge. */
168 pvi->bridge.funcs = &imx_hdmi_pvi_bridge_funcs;
169 pvi->bridge.of_node = pdev->dev.of_node;
170 pvi->bridge.timings = pvi->next_bridge->timings;
171
172 drm_bridge_add(&pvi->bridge);
173
174 return 0;
175 }
176
imx8mp_hdmi_pvi_remove(struct platform_device * pdev)177 static void imx8mp_hdmi_pvi_remove(struct platform_device *pdev)
178 {
179 struct imx8mp_hdmi_pvi *pvi = platform_get_drvdata(pdev);
180
181 drm_bridge_remove(&pvi->bridge);
182
183 pm_runtime_disable(&pdev->dev);
184 }
185
186 static const struct of_device_id imx8mp_hdmi_pvi_match[] = {
187 {
188 .compatible = "fsl,imx8mp-hdmi-pvi",
189 }, {
190 /* sentinel */
191 }
192 };
193 MODULE_DEVICE_TABLE(of, imx8mp_hdmi_pvi_match);
194
195 static struct platform_driver imx8mp_hdmi_pvi_driver = {
196 .probe = imx8mp_hdmi_pvi_probe,
197 .remove = imx8mp_hdmi_pvi_remove,
198 .driver = {
199 .name = "imx-hdmi-pvi",
200 .of_match_table = imx8mp_hdmi_pvi_match,
201 },
202 };
203 module_platform_driver(imx8mp_hdmi_pvi_driver);
204
205 MODULE_DESCRIPTION("i.MX8MP HDMI TX Parallel Video Interface bridge driver");
206 MODULE_LICENSE("GPL");
207