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|
// 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/of.h>
#include <linux/of_device.h>
#include <linux/of_graph.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <drm/drm_atomic.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_bridge.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_panel.h>
#include "rcar_lvds_regs.h"
/* 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,
};
#define RCAR_LVDS_QUIRK_LANES (1 << 0) /* LVDS lanes 1 and 3 inverted */
struct rcar_lvds_device_info {
unsigned int gen;
unsigned int quirks;
};
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 clk *clock;
bool enabled;
struct drm_display_mode display_mode;
enum rcar_lvds_mode mode;
};
#define bridge_to_rcar_lvds(bridge) \
container_of(bridge, struct rcar_lvds, bridge)
#define connector_to_rcar_lvds(connector) \
container_of(connector, 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);
}
static int rcar_lvds_connector_atomic_check(struct drm_connector *connector,
struct drm_connector_state *state)
{
struct rcar_lvds *lvds = connector_to_rcar_lvds(connector);
const struct drm_display_mode *panel_mode;
struct drm_crtc_state *crtc_state;
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->state, 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,
};
/* -----------------------------------------------------------------------------
* Bridge
*/
static u32 rcar_lvds_lvdpllcr_gen2(unsigned int freq)
{
if (freq < 39000)
return LVDPLLCR_CEEN | LVDPLLCR_COSEL | LVDPLLCR_PLLDLYCNT_38M;
else if (freq < 61000)
return LVDPLLCR_CEEN | LVDPLLCR_COSEL | LVDPLLCR_PLLDLYCNT_60M;
else if (freq < 121000)
return LVDPLLCR_CEEN | LVDPLLCR_COSEL | LVDPLLCR_PLLDLYCNT_121M;
else
return LVDPLLCR_PLLDLYCNT_150M;
}
static u32 rcar_lvds_lvdpllcr_gen3(unsigned int freq)
{
if (freq < 42000)
return LVDPLLCR_PLLDIVCNT_42M;
else if (freq < 85000)
return LVDPLLCR_PLLDIVCNT_85M;
else if (freq < 128000)
return LVDPLLCR_PLLDIVCNT_128M;
else
return LVDPLLCR_PLLDIVCNT_148M;
}
static void rcar_lvds_enable(struct drm_bridge *bridge)
{
struct rcar_lvds *lvds = bridge_to_rcar_lvds(bridge);
const struct drm_display_mode *mode = &lvds->display_mode;
/*
* FIXME: We should really retrieve the CRTC through the state, but how
* do we get a state pointer?
*/
struct drm_crtc *crtc = lvds->bridge.encoder->crtc;
u32 lvdpllcr;
u32 lvdhcr;
u32 lvdcr0;
int ret;
WARN_ON(lvds->enabled);
ret = clk_prepare_enable(lvds->clock);
if (ret < 0)
return;
/*
* Hardcode the channels and control signals routing for now.
*
* HSYNC -> CTRL0
* VSYNC -> CTRL1
* DISP -> CTRL2
* 0 -> CTRL3
*/
rcar_lvds_write(lvds, LVDCTRCR, LVDCTRCR_CTR3SEL_ZERO |
LVDCTRCR_CTR2SEL_DISP | LVDCTRCR_CTR1SEL_VSYNC |
LVDCTRCR_CTR0SEL_HSYNC);
if (lvds->info->quirks & RCAR_LVDS_QUIRK_LANES)
lvdhcr = LVDCHCR_CHSEL_CH(0, 0) | LVDCHCR_CHSEL_CH(1, 3)
| LVDCHCR_CHSEL_CH(2, 2) | LVDCHCR_CHSEL_CH(3, 1);
else
lvdhcr = LVDCHCR_CHSEL_CH(0, 0) | LVDCHCR_CHSEL_CH(1, 1)
| LVDCHCR_CHSEL_CH(2, 2) | LVDCHCR_CHSEL_CH(3, 3);
rcar_lvds_write(lvds, LVDCHCR, lvdhcr);
/* PLL clock configuration. */
if (lvds->info->gen < 3)
lvdpllcr = rcar_lvds_lvdpllcr_gen2(mode->clock);
else
lvdpllcr = rcar_lvds_lvdpllcr_gen3(mode->clock);
rcar_lvds_write(lvds, LVDPLLCR, lvdpllcr);
/* Set the LVDS mode and select the input. */
lvdcr0 = lvds->mode << LVDCR0_LVMD_SHIFT;
if (drm_crtc_index(crtc) == 2)
lvdcr0 |= LVDCR0_DUSEL;
rcar_lvds_write(lvds, LVDCR0, lvdcr0);
/* Turn all the channels on. */
rcar_lvds_write(lvds, LVDCR1,
LVDCR1_CHSTBY(3) | LVDCR1_CHSTBY(2) |
LVDCR1_CHSTBY(1) | LVDCR1_CHSTBY(0) | LVDCR1_CLKSTBY);
if (lvds->info->gen < 3) {
/* Enable LVDS operation and turn the bias circuitry on. */
lvdcr0 |= LVDCR0_BEN | LVDCR0_LVEN;
rcar_lvds_write(lvds, LVDCR0, lvdcr0);
}
/* Turn the PLL on. */
lvdcr0 |= LVDCR0_PLLON;
rcar_lvds_write(lvds, LVDCR0, lvdcr0);
if (lvds->info->gen > 2) {
/* Set LVDS normal mode. */
lvdcr0 |= LVDCR0_PWD;
rcar_lvds_write(lvds, LVDCR0, lvdcr0);
}
/* Wait for the startup delay. */
usleep_range(100, 150);
/* Turn the output on. */
lvdcr0 |= LVDCR0_LVRES;
rcar_lvds_write(lvds, LVDCR0, lvdcr0);
if (lvds->panel) {
drm_panel_prepare(lvds->panel);
drm_panel_enable(lvds->panel);
}
lvds->enabled = true;
}
static void rcar_lvds_disable(struct drm_bridge *bridge)
{
struct rcar_lvds *lvds = bridge_to_rcar_lvds(bridge);
WARN_ON(!lvds->enabled);
if (lvds->panel) {
drm_panel_disable(lvds->panel);
drm_panel_unprepare(lvds->panel);
}
rcar_lvds_write(lvds, LVDCR0, 0);
rcar_lvds_write(lvds, LVDCR1, 0);
clk_disable_unprepare(lvds->clock);
lvds->enabled
|