// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2017 NXP Semiconductors.
* Author: Marco Franchi <marco.franchi@nxp.com>
*
* Based on Panel Simple driver by Thierry Reding <treding@nvidia.com>
*/
#include <linux/backlight.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/regulator/consumer.h>
#include <drm/drmP.h>
#include <drm/drm_crtc.h>
#include <drm/drm_panel.h>
#include <video/display_timing.h>
#include <video/videomode.h>
struct seiko_panel_desc {
const struct drm_display_mode *modes;
unsigned int num_modes;
const struct display_timing *timings;
unsigned int num_timings;
unsigned int bpc;
/**
* @width: width (in millimeters) of the panel's active display area
* @height: height (in millimeters) of the panel's active display area
*/
struct {
unsigned int width;
unsigned int height;
} size;
u32 bus_format;
u32 bus_flags;
};
struct seiko_panel {
struct drm_panel base;
bool prepared;
bool enabled;
const struct seiko_panel_desc *desc;
struct backlight_device *backlight;
struct regulator *dvdd;
struct regulator *avdd;
};
static inline struct seiko_panel *to_seiko_panel(struct drm_panel *panel)
{
return container_of(panel, struct seiko_panel, base);
}
static int seiko_panel_get_fixed_modes(struct seiko_panel *panel)
{
struct drm_connector *connector = panel->base.connector;
struct drm_device *drm = panel->base.drm;
struct drm_display_mode *mode;
unsigned int i, num = 0;
if (!panel->desc)
return 0;
for (i = 0; i < panel->desc->num_timings; i++) {
const struct display_timing *dt = &panel->desc->timings[i];
struct videomode vm;
videomode_from_timing(dt, &vm);
mode = drm_mode_create(drm);
if (!mode) {
dev_err(drm->dev, "failed to add mode %ux%u\n",
dt->hactive.typ, dt->vactive.typ);
continue;
}
drm_display_mode_from_videomode(&vm, mode);
mode->type |= DRM_MODE_TYPE_DRIVER;
if (panel->desc->num_timings == 1)
mode->type |= DRM_MODE_TYPE_PREFERRED;
drm_mode_probed_add(connector, mode);
num++;
}
for (i = 0; i < panel->desc->num_modes; i++) {
const struct drm_display_mode *m = &panel->desc->modes[i];
mode = drm_mode_duplicate(drm, m);
if (!mode) {
dev_err(drm->dev, "failed to add mode %ux%u@%u\n",
m->hdisplay, m->vdisplay, m->vrefresh);
continue;
}
mode->type |= DRM_MODE_TYPE_DRIVER;
if (panel->desc->num_modes == 1)
mode->type |= DRM_MODE_TYPE_PREFERRED;
drm_mode_set_name(mode);
drm_mode_probed_add(connector, mode);
num++;
}
connector->display_info.bpc = panel->desc->bpc;
connector->display_info.width_mm = panel->desc->size.width;
connector->display_info.height_mm = panel->desc->size.height;
if (panel->desc->bus_format)
drm_display_info_set_bus_formats(&connector->display_info,
&panel->desc->bus_format, 1);
connector->display_info.bus_flags = panel->desc->bus_flags;
return num;
}
static int seiko_panel_disable(struct drm_panel *panel)
{
struct seiko_panel *p = to_seiko_panel(panel);
if (!p->enabled)
return 0;
if (p->backlight) {
p->backlight->props.power = FB_BLANK_POWERDOWN;
p->backlight->props.state |= BL_CORE_FBBLANK;
backlight_update_status(p->backlight);
}
p->enabled = false;
return 0;
}
static int seiko_panel_unprepare(struct drm_panel *panel)
{
struct seiko_panel *p = to_seiko_panel(panel);
if (!p->prepared)
return 0;
regulator_disable(p->avdd);
/* Add a 100ms delay as per the panel datasheet */
msleep(100);
regulator_disable(p->dvdd);
p->prepared = false;
return 0;
}
static int seiko_panel_prepare(struct drm_panel *panel)
{
struct seiko_panel *p = to_seiko_panel(panel);
int err;
if (p->prepared)
return 0;
err = regulator_enable(p->dvdd);
if (err < 0) {
dev_err(panel->dev, "failed to enable dvdd: %d\n", err);
return err;
}
/* Add a 100ms delay as per the panel datasheet */
msleep(100);
err = regulator_enable(p->avdd);
if (err < 0) {
dev_err(panel->dev, "failed to enable avdd: %d\n", err);
goto disable_dvdd;
}
p->prepared = true;
return 0;
disable_dvdd:
regulator_disable(p->dvdd);
return err;
}
static int seiko_panel_enable(struct drm_panel *panel)
{
struct seiko_panel *p = to_seiko_panel(panel);
if (p->enabled)
return 0;
if (p->backlight) {
p->backlight->props.state &= ~BL_CORE_FBBLANK;
p->backlight->props.power = FB_BLANK_UNBLANK;
backlight_update_status(p->backlight);
}
p->enabled = true;
return 0;
}
static int seiko_panel_get_modes(struct drm_panel *panel)
{
struct seiko_panel *p = to_seiko_panel(panel);
/* add hard-coded panel modes */
return seiko_panel_get_fixed_modes(p);
}
static int seiko_panel_get_timings(struct drm_panel *panel,
unsigned int num_timings,
struct display_timing *timings)
{
struct seiko_panel *p = to_seiko_panel(panel);
unsigned int i;
if (p->desc->num_timings < num_timings)
num_timings = p->desc->num_timings;
if (timings)
for (i = 0; i < num_timings; i++)
timings[i] = p->desc->timings[i];
return p->desc->num_timings;
}
static const struct drm_panel_funcs seiko_panel_funcs = {
.disable = seiko_panel_disable,
.unprepare = seiko_panel_unprepare,
.prepare = seiko_panel_prepare,
.enable = seiko_panel_enable,
.get_modes = seiko_panel_get_modes,
.get_timings = seiko_panel_get_timings,
};
static int seiko_panel_probe(struct device *dev,
const struct seiko_panel_desc *desc)
{
struct device_node *backlight;
struct seiko_panel *panel;
int err;
panel = devm_kzalloc(dev, sizeof(*panel), GFP_KERNEL);
if (!panel)
return -ENOMEM;
panel->enabled = false;
panel->prepared = false;
panel->desc = desc;
panel->dvdd = devm_regulator_get(dev, "dvdd");
if (IS_ERR(panel->dvdd))
return PTR_ERR(panel->dvdd);
panel->avdd = devm_regulator_get(dev, "avdd");
if (IS_ERR(panel->avdd))
return PTR_ERR(panel->avdd);
backlight = of_parse_phandle(dev->of_node, "backlight", 0);
if (backlight) {
panel->backlight = of_find_backlight_by_node(backlight);
of_node_put(backlight);
if (!panel->backlight)
return -EPROBE_DEFER;
}
drm_panel_init(&panel->base);
panel->base.dev = dev;
panel->base.funcs = &seiko_panel_funcs;
err = drm_panel_add(&panel->base);
if (err < 0)
return err;
dev_set_drvdata(dev, panel);
return 0;
}
static int seiko_panel_remove(struct platform_device *pdev)
{
struct seiko_panel *panel = dev_get_drvdata(&pdev->dev);
drm_panel_remove(&panel->base);
seiko_panel_disable(&panel->base);
if (panel->backlight)
put_device(&panel->backlight->dev);
return 0;
}
static void seiko_panel_shutdown(struct platform_device *pdev)
{
struct seiko_panel *panel = dev_get_drvdata(&pdev->dev);
seiko_panel_disable(&panel->base);
}
static const struct display_timing seiko_43wvf1g_timing = {
.pixelclock = { 33500000, 33500000, 33500000 },
.hactive = { 800, 800, 800 },
.hfront_porch = { 164, 164, 164 },
.hback_porch = { 89, 89, 89 },
.hsync_len = { 10, 10, 10 },
.vactive = { 480, 480, 480 },
.vfront_porch = { 10, 10, 10 },
.vback_porch = { 23, 23, 23 },
.vsync_len = { 10, 10, 10 },
.flags = DISPLAY_FLAGS_DE_LOW,
};
static const struct seiko_panel_desc seiko_43wvf1g = {
.timings = &seiko_43wvf1g_timing,
.num_timings = 1,
.bpc = 8,
.size = {
.width = 93,
.height = 57,
},
.bus_format = MEDIA_BUS_FMT_RGB888_1X24,
.bus_flags = DRM_BUS_FLAG_DE_HIGH | DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE,
};
static const struct of_device_id platform_of_match[] = {
{
.compatible = "sii,43wvf1g",
.data = &seiko_43wvf1g,
}, {
/* sentinel */
}
};
MODULE_DEVICE_TABLE(of, platform_of_match);
static int seiko_panel_platform_probe(struct platform_device *pdev)
{
const struct of_device_id *id;
id = of_match_node(platform_of_match, pdev->dev.of_node);
if (!id)
return -ENODEV;
return seiko_panel_probe(&pdev->dev, id->data);
}
static struct platform_driver seiko_panel_platform_driver = {
.driver = {
.name = "seiko_panel",
.of_match_table = platform_of_match,
},
.probe = seiko_panel_platform_probe,
.remove = seiko_panel_remove,
.shutdown = seiko_panel_shutdown,
};
module_platform_driver(seiko_panel_platform_driver);
MODULE_AUTHOR("Marco Franchi <marco.franchi@nxp.com>");
MODULE_DESCRIPTION("Seiko 43WVF1G panel driver");
MODULE_LICENSE("GPL v2");
