Quelle  imx8mp-hdmi-pvi.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0+

/*
 * Copyright (C) 2022 Pengutronix, Lucas Stach <kernel@pengutronix.de>
 */

#include <drm/drm_atomic_helper.h>
#include <drm/drm_bridge.h>
#include <drm/drm_crtc.h>
#include <linux/bitfield.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_graph.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>

#define HTX_PVI_CTRL   0x0
#define  PVI_CTRL_OP_VSYNC_POL  BIT(18)
#define  PVI_CTRL_OP_HSYNC_POL  BIT(17)
#define  PVI_CTRL_OP_DE_POL  BIT(16)
#define  PVI_CTRL_INP_VSYNC_POL  BIT(14)
#define  PVI_CTRL_INP_HSYNC_POL  BIT(13)
#define  PVI_CTRL_INP_DE_POL  BIT(12)
#define  PVI_CTRL_MODE_MASK  GENMASK(2, 1)
#define  PVI_CTRL_MODE_LCDIF  2
#define  PVI_CTRL_EN   BIT(0)

struct imx8mp_hdmi_pvi {
 struct drm_bridge bridge;
 struct device  *dev;
 struct drm_bridge *next_bridge;
 void __iomem  *regs;
};

static inline struct imx8mp_hdmi_pvi *
to_imx8mp_hdmi_pvi(struct drm_bridge *bridge)
{
 return container_of(bridge, struct imx8mp_hdmi_pvi, bridge);
}

static int imx8mp_hdmi_pvi_bridge_attach(struct drm_bridge *bridge,
      struct drm_encoder *encoder,
      enum drm_bridge_attach_flags flags)
{
 struct imx8mp_hdmi_pvi *pvi = to_imx8mp_hdmi_pvi(bridge);

 return drm_bridge_attach(encoder, pvi->next_bridge,
     bridge, flags);
}

static void imx8mp_hdmi_pvi_bridge_enable(struct drm_bridge *bridge,
       struct drm_atomic_state *state)
{
 struct imx8mp_hdmi_pvi *pvi = to_imx8mp_hdmi_pvi(bridge);
 struct drm_connector_state *conn_state;
 struct drm_bridge_state *bridge_state;
 const struct drm_display_mode *mode;
 struct drm_crtc_state *crtc_state;
 struct drm_connector *connector;
 u32 bus_flags = 0, val;

 bridge_state = drm_atomic_get_new_bridge_state(state, bridge);
 connector = drm_atomic_get_new_connector_for_encoder(state, bridge->encoder);
 conn_state = drm_atomic_get_new_connector_state(state, connector);
 crtc_state = drm_atomic_get_new_crtc_state(state, conn_state->crtc);

 if (WARN_ON(pm_runtime_resume_and_get(pvi->dev)))
  return;

 mode = &crtc_state->adjusted_mode;

 val = FIELD_PREP(PVI_CTRL_MODE_MASK, PVI_CTRL_MODE_LCDIF) | PVI_CTRL_EN;

 if (mode->flags & DRM_MODE_FLAG_PVSYNC)
  val |= PVI_CTRL_OP_VSYNC_POL | PVI_CTRL_INP_VSYNC_POL;

 if (mode->flags & DRM_MODE_FLAG_PHSYNC)
  val |= PVI_CTRL_OP_HSYNC_POL | PVI_CTRL_INP_HSYNC_POL;

 if (pvi->next_bridge->timings)
  bus_flags = pvi->next_bridge->timings->input_bus_flags;
 else if (bridge_state)
  bus_flags = bridge_state->input_bus_cfg.flags;

 if (bus_flags & DRM_BUS_FLAG_DE_HIGH)
  val |= PVI_CTRL_OP_DE_POL | PVI_CTRL_INP_DE_POL;

 writel(val, pvi->regs + HTX_PVI_CTRL);
}

static void imx8mp_hdmi_pvi_bridge_disable(struct drm_bridge *bridge,
        struct drm_atomic_state *state)
{
 struct imx8mp_hdmi_pvi *pvi = to_imx8mp_hdmi_pvi(bridge);

 writel(0x0, pvi->regs + HTX_PVI_CTRL);

 pm_runtime_put(pvi->dev);
}

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)
{
 struct imx8mp_hdmi_pvi *pvi = to_imx8mp_hdmi_pvi(bridge);
 struct drm_bridge *next_bridge = pvi->next_bridge;
 struct drm_bridge_state *next_state;

 if (!next_bridge->funcs->atomic_get_input_bus_fmts)
  return NULL;

 next_state = drm_atomic_get_new_bridge_state(crtc_state->state,
           next_bridge);

 return next_bridge->funcs->atomic_get_input_bus_fmts(next_bridge,
            next_state,
            crtc_state,
            conn_state,
            output_fmt,
            num_input_fmts);
}

static const struct drm_bridge_funcs imx_hdmi_pvi_bridge_funcs = {
 .attach  = imx8mp_hdmi_pvi_bridge_attach,
 .atomic_enable = imx8mp_hdmi_pvi_bridge_enable,
 .atomic_disable = imx8mp_hdmi_pvi_bridge_disable,
 .atomic_get_input_bus_fmts = imx8mp_hdmi_pvi_bridge_get_input_bus_fmts,
 .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
 .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
 .atomic_reset = drm_atomic_helper_bridge_reset,
};

static int imx8mp_hdmi_pvi_probe(struct platform_device *pdev)
{
 struct device_node *remote;
 struct imx8mp_hdmi_pvi *pvi;

 pvi = devm_drm_bridge_alloc(&pdev->dev, struct imx8mp_hdmi_pvi,
        bridge, &imx_hdmi_pvi_bridge_funcs);
 if (IS_ERR(pvi))
  return PTR_ERR(pvi);

 platform_set_drvdata(pdev, pvi);
 pvi->dev = &pdev->dev;

 pvi->regs = devm_platform_ioremap_resource(pdev, 0);
 if (IS_ERR(pvi->regs))
  return PTR_ERR(pvi->regs);

 /* Get the next bridge in the pipeline. */
 remote = of_graph_get_remote_node(pdev->dev.of_node, 1, -1);
 if (!remote)
  return -EINVAL;

 pvi->next_bridge = of_drm_find_bridge(remote);
 of_node_put(remote);

 if (!pvi->next_bridge)
  return dev_err_probe(&pdev->dev, -EPROBE_DEFER,
         "could not find next bridge\n");

 pm_runtime_enable(&pdev->dev);

 /* Register the bridge. */
 pvi->bridge.of_node = pdev->dev.of_node;
 pvi->bridge.timings = pvi->next_bridge->timings;

 drm_bridge_add(&pvi->bridge);

 return 0;
}

static void imx8mp_hdmi_pvi_remove(struct platform_device *pdev)
{
 struct imx8mp_hdmi_pvi *pvi = platform_get_drvdata(pdev);

 drm_bridge_remove(&pvi->bridge);

 pm_runtime_disable(&pdev->dev);
}

static const struct of_device_id imx8mp_hdmi_pvi_match[] = {
 {
  .compatible = "fsl,imx8mp-hdmi-pvi",
 }, {
  /* sentinel */
 }
};
MODULE_DEVICE_TABLE(of, imx8mp_hdmi_pvi_match);

static struct platform_driver imx8mp_hdmi_pvi_driver = {
 .probe = imx8mp_hdmi_pvi_probe,
 .remove = imx8mp_hdmi_pvi_remove,
 .driver  = {
  .name = "imx-hdmi-pvi",
  .of_match_table = imx8mp_hdmi_pvi_match,
 },
};
module_platform_driver(imx8mp_hdmi_pvi_driver);

MODULE_DESCRIPTION("i.MX8MP HDMI TX Parallel Video Interface bridge driver");
MODULE_LICENSE("GPL");