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 * 37 to_imx8mp_hdmi_pvi(struct drm_bridge *bridge) 38 { 39 return container_of(bridge, struct imx8mp_hdmi_pvi, bridge); 40 } 41 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 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 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 * 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 }; 135 136 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 } 175 176 static int 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 return 0; 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