// SPDX-License-Identifier: GPL-2.0
/*
* rcar_lvds.c -- R-Car LVDS Encoder
*
* Copyright (C) 2013-2018 Renesas Electronics Corporation
*
* Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com)
*/
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/of_graph.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/sys_soc.h>
#include <drm/drm_atomic.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_bridge.h>
#include <drm/drm_of.h>
#include <drm/drm_panel.h>
#include <drm/drm_print.h>
#include <drm/drm_probe_helper.h>
#include "rcar_lvds.h"
#include "rcar_lvds_regs.h"
struct rcar_lvds;
/* Keep in sync with the LVDCR0.LVMD hardware register values. */
enum rcar_lvds_mode {
RCAR_LVDS_MODE_JEIDA = 0,
RCAR_LVDS_MODE_MIRROR = 1,
RCAR_LVDS_MODE_VESA = 4,
};
enum rcar_lvds_link_type {
RCAR_LVDS_SINGLE_LINK = 0,
RCAR_LVDS_DUAL_LINK_EVEN_ODD_PIXELS = 1,
RCAR_LVDS_DUAL_LINK_ODD_EVEN_PIXELS = 2,
};
#define RCAR_LVDS_QUIRK_LANES BIT(0) /* LVDS lanes 1 and 3 inverted */
#define RCAR_LVDS_QUIRK_GEN3_LVEN BIT(1) /* LVEN bit needs to be set on R8A77970/R8A7799x */
#define RCAR_LVDS_QUIRK_PWD BIT(2) /* PWD bit available (all of Gen3 but E3) */
#define RCAR_LVDS_QUIRK_EXT_PLL BIT(3) /* Has extended PLL */
#define RCAR_LVDS_QUIRK_DUAL_LINK BIT(4) /* Supports dual-link operation */
struct rcar_lvds_device_info {
unsigned int gen;
unsigned int quirks;
void (*pll_setup)(struct rcar_lvds *lvds, unsigned int freq);
};
struct rcar_lvds {
struct device *dev;
const struct rcar_lvds_device_info *info;
struct drm_bridge bridge;
struct drm_bridge *next_bridge;
struct drm_connector connector;
struct drm_panel *panel;
void __iomem *mmio;
struct {
struct clk *mod; /* CPG module clock */
struct clk *extal; /* External clock */
struct clk *dotclkin[2]; /* External DU clocks */
} clocks;
struct drm_bridge *companion;
enum rcar_lvds_link_type link_type;
};
#define bridge_to_rcar_lvds(b) \
container_of(b, struct rcar_lvds, bridge)
#define connector_to_rcar_lvds(c) \
container_of(c, struct rcar_lvds, connector)
static void rcar_lvds_write(struct rcar_lvds *lvds, u32 reg, u32 data)
{
iowrite32(data, lvds->mmio + reg);
}
/* -----------------------------------------------------------------------------
* Connector & Panel
*/
static int rcar_lvds_connector_get_modes(struct drm_connector *connector)
{
struct rcar_lvds *lvds = connector_to_rcar_lvds(connector);
return drm_panel_get_modes(lvds->panel, connector);
}
static int rcar_lvds_connector_atomic_check(struct drm_connector *connector,
struct drm_atomic_state *state)
{
struct rcar_lvds *lvds = connector_to_rcar_lvds(connector);
const struct drm_display_mode *panel_mode;
struct drm_connector_state *conn_state;
struct drm_crtc_state *crtc_state;
conn_state = drm_atomic_get_new_connector_state(state, connector);
if (!conn_state->crtc)
return 0;
if (list_empty(&connector->modes)) {
dev_dbg(lvds->dev, "connector: empty modes list\n");
return -EINVAL;
}
panel_mode = list_first_entry(&connector->modes,
struct drm_display_mode, head);
/* We're not allowed to modify the resolution. */
crtc_state = drm_atomic_get_crtc_state(state, conn_state->crtc);
if (IS_ERR(crtc_state))
return PTR_ERR(crtc_state);
if (crtc_state->mode.hdisplay != panel_mode->hdisplay ||
crtc_state->mode.vdisplay != panel_mode->vdisplay)
return -EINVAL;
/* The flat panel mode is fixed, just copy it to the adjusted mode. */
drm_mode_copy(&crtc_state->adjusted_mode, panel_mode);
return 0;
}
static const struct drm_connector_helper_funcs rcar_lvds_conn_helper_funcs = {
.get_modes = rcar_lvds_connector_get_modes,
.atomic_check = rcar_lvds_connector_atomic_check,
};
static const struct drm_connector_funcs rcar_lvds_conn_funcs = {
.reset = drm_atomic_helper_connector_reset,
.fill_modes = drm_helper_probe_single_connector_modes,
.destroy = drm_connector_cleanup,
.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
};
/* -----------------------------------------------------------------------------
* PLL Setup
*/
static void rcar_lvds_pll_setup_gen2(struct rcar_lvds *lvds, unsigned int freq)
{
u32 val;
if (freq < 39000000)
val = LVDPLLCR_CEEN | LVDPLLCR_COSEL | LVDPLLCR_PLLDLYCNT_38M;
else if (freq