drivers/gpu/drm/bridge/imx/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
  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 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 = 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");