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_bridge_state * bridge_state)51 static 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
imx8mp_hdmi_pvi_bridge_disable(struct drm_bridge * bridge,struct drm_bridge_state * bridge_state)90 static 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
100 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)101 imx8mp_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
126 static 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
imx8mp_hdmi_pvi_probe(struct platform_device * pdev)136 static 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
imx8mp_hdmi_pvi_remove(struct platform_device * pdev)176 static 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
185 static const struct of_device_id imx8mp_hdmi_pvi_match[] = {
186 {
187 .compatible = "fsl,imx8mp-hdmi-pvi",
188 }, {
189 /* sentinel */
190 }
191 };
192 MODULE_DEVICE_TABLE(of, imx8mp_hdmi_pvi_match);
193
194 static struct platform_driver imx8mp_hdmi_pvi_driver = {
195 .probe = imx8mp_hdmi_pvi_probe,
196 .remove_new = imx8mp_hdmi_pvi_remove,
197 .driver = {
198 .name = "imx-hdmi-pvi",
199 .of_match_table = imx8mp_hdmi_pvi_match,
200 },
201 };
202 module_platform_driver(imx8mp_hdmi_pvi_driver);
203
204 MODULE_DESCRIPTION("i.MX8MP HDMI TX Parallel Video Interface bridge driver");
205 MODULE_LICENSE("GPL");
206