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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 0x019#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 227#define PVI_CTRL_EN BIT(0)28 29struct imx8mp_hdmi_pvi {30 struct drm_bridge bridge;31 struct device *dev;32 struct drm_bridge *next_bridge;33 void __iomem *regs;34};35 36static inline struct imx8mp_hdmi_pvi *37to_imx8mp_hdmi_pvi(struct drm_bridge *bridge)38{39 return container_of(bridge, struct imx8mp_hdmi_pvi, bridge);40}41 42static 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 51static 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 90static 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 100static u32 *101imx8mp_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 126static 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 136static 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 176static 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 185static const struct of_device_id imx8mp_hdmi_pvi_match[] = {186 {187 .compatible = "fsl,imx8mp-hdmi-pvi",188 }, {189 /* sentinel */190 }191};192MODULE_DEVICE_TABLE(of, imx8mp_hdmi_pvi_match);193 194static 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};202module_platform_driver(imx8mp_hdmi_pvi_driver);203 204MODULE_DESCRIPTION("i.MX8MP HDMI TX Parallel Video Interface bridge driver");205MODULE_LICENSE("GPL");206