/**
* Register a new display based on device tree configuration.
*
* The frame buffer can be positioned by U-Boot or overriden by the fdt.
* You should pass in the U-Boot address here, and check the contents of
* struct tegra_lcd_priv to see what was actually chosen.
*
* @param blob Device tree blob
* @param priv Driver's private data
* @param default_lcd_base Default address of LCD frame buffer
* @return 0 if ok, -1 on error (unsupported bits per pixel)
*/
static int tegra_display_probe(const void *blob, struct tegra_lcd_priv *priv,
void *default_lcd_base)
{
struct disp_ctl_win window;
struct dc_ctlr *dc;
priv->frame_buffer = (u32)default_lcd_base;
dc = (struct dc_ctlr *)priv->disp;
/*
* A header file for clock constants was NAKed upstream.
* TODO: Put this into the FDT and fdt_lcd struct when we have clock
* support there
*/
clock_start_periph_pll(PERIPH_ID_HOST1X, CLOCK_ID_PERIPH,
144 * 1000000);
clock_start_periph_pll(PERIPH_ID_DISP1, CLOCK_ID_CGENERAL,
600 * 1000000);
basic_init(&dc->cmd);
basic_init_timer(&dc->disp);
rgb_enable(&dc->com);
if (priv->pixel_clock)
update_display_mode(&dc->disp, priv);
if (setup_window(&window, priv))
return -1;
update_window(dc, &window);
return 0;
}
static int sevseg_reset_resume(struct usb_interface *intf)
{
struct usb_sevsegdev *mydev;
mydev = usb_get_intfdata(intf);
mydev->shadow_power = 1;
update_display_mode(mydev);
update_display_visual(mydev, GFP_NOIO);
return 0;
}
/* this is really aimed at the lcd panel. That said, there are two display
* devices on this part and we may someday want to extend it for other boards.
*/
void display_startup(device_t dev)
{
struct soc_nvidia_tegra124_config *config = dev->chip_info;
struct display_controller *disp_ctrl = (void *)config->display_controller;
struct pwm_controller *pwm = (void *)TEGRA_PWM_BASE;
struct tegra_dc *dc = &dc_data;
u32 plld_rate;
/* init dc */
dc->base = (void *)TEGRA_ARM_DISPLAYA;
dc->config = config;
config->dc_data = dc;
/* Note dp_init may read EDID and change some config values. */
dp_init(config);
/* should probably just make it all MiB ... in future */
u32 framebuffer_size_mb = config->framebuffer_size / MiB;
u32 framebuffer_base_mb= config->framebuffer_base / MiB;
/* light it all up */
/* This one may have been done in romstage but that's ok for now. */
if (config->panel_vdd_gpio){
gpio_output(config->panel_vdd_gpio, 1);
printk(BIOS_SPEW,"%s: panel_vdd setting gpio %08x to %d\n",
__func__, config->panel_vdd_gpio, 1);
}
udelay(config->vdd_delay_ms * 1000);
if (config->backlight_vdd_gpio){
gpio_output(config->backlight_vdd_gpio, 1);
printk(BIOS_SPEW,"%s: backlight vdd setting gpio %08x to %d\n",
__func__, config->backlight_vdd_gpio, 1);
}
if (config->lvds_shutdown_gpio){
gpio_output(config->lvds_shutdown_gpio, 0);
printk(BIOS_SPEW,"%s: lvds shutdown setting gpio %08x to %d\n",
__func__, config->lvds_shutdown_gpio, 0);
}
if (framebuffer_size_mb == 0){
framebuffer_size_mb = ALIGN_UP(config->xres * config->yres *
(config->framebuffer_bits_per_pixel / 8), MiB)/MiB;
}
if (! framebuffer_base_mb)
framebuffer_base_mb = fb_base_mb();
config->framebuffer_size = framebuffer_size_mb * MiB;
config->framebuffer_base = framebuffer_base_mb * MiB;
mmu_config_range(framebuffer_base_mb, framebuffer_size_mb,
config->cache_policy);
printk(BIOS_SPEW, "LCD frame buffer at %dMiB to %dMiB\n", framebuffer_base_mb,
framebuffer_base_mb + framebuffer_size_mb);
/* GPIO magic here if needed to start powering up things. You
* really only want to enable vdd, wait a bit, and then enable
* the panel. However ... the timings in the tegra20 dts make
* no sense to me. I'm pretty sure they're wrong.
* The panel_vdd is done in the romstage, so we need only
* light things up here once we're sure it's all working.
*/
/* The plld is programmed with the assumption of the SHIFT_CLK_DIVIDER
* and PIXEL_CLK_DIVIDER are zero (divide by 1). See the
* update_display_mode() for detail.
*/
plld_rate = clock_display(config->pixel_clock * 2);
if (plld_rate == 0) {
printk(BIOS_ERR, "dc: clock init failed\n");
return;
} else if (plld_rate != config->pixel_clock * 2) {
printk(BIOS_WARNING, "dc: plld rounded to %u\n", plld_rate);
config->pixel_clock = plld_rate / 2;
}
/* Init dc */
if (tegra_dc_init(disp_ctrl)) {
printk(BIOS_ERR, "dc: init failed\n");
return;
}
/* Configure dc mode */
if (update_display_mode(disp_ctrl, config)) {
printk(BIOS_ERR, "dc: failed to configure display mode.\n");
return;
}
/* Enable dp */
dp_enable(dc->out);
/* Init frame buffer */
memset((void *)(framebuffer_base_mb*MiB), 0x00,
framebuffer_size_mb*MiB);
update_window(disp_ctrl, config);
/* Set up Tegra PWM n (where n is specified in config->pwm) to drive the
* panel backlight.
*/
printk(BIOS_SPEW, "%s: enable panel backlight pwm\n", __func__);
WRITEL(((1 << NV_PWM_CSR_ENABLE_SHIFT) |
(220 << NV_PWM_CSR_PULSE_WIDTH_SHIFT) | /* 220/256 */
0x02e), /* frequency divider */
&pwm->pwm[config->pwm].csr);
udelay(config->pwm_to_bl_delay_ms * 1000);
if (config->backlight_en_gpio){
gpio_output(config->backlight_en_gpio, 1);
printk(BIOS_SPEW,"%s: backlight enable setting gpio %08x to %d\n",
__func__, config->backlight_en_gpio, 1);
}
printk(BIOS_INFO, "%s: display init done.\n", __func__);
/* tell depthcharge ...
*/
struct edid edid;
edid.bytes_per_line = ((config->xres * config->framebuffer_bits_per_pixel / 8 + 31) /
32 * 32);
edid.x_resolution = edid.bytes_per_line / (config->framebuffer_bits_per_pixel / 8);
edid.y_resolution = config->yres;
edid.framebuffer_bits_per_pixel = config->framebuffer_bits_per_pixel;
set_vbe_mode_info_valid(&edid, (uintptr_t)(framebuffer_base_mb*MiB));
}
int display_init(void *lcdbase, int fb_bits_per_pixel,
struct display_timing *timing)
{
struct dc_ctlr *dc_ctlr;
const void *blob = gd->fdt_blob;
struct udevice *dp_dev;
const int href_to_sync = 1, vref_to_sync = 1;
int panel_bpp = 18; /* default 18 bits per pixel */
u32 plld_rate;
struct gpio_desc vdd_gpio, enable_gpio;
int pwm;
int node;
int ret;
ret = uclass_get_device(UCLASS_DISPLAY, 0, &dp_dev);
if (ret)
return ret;
node = fdtdec_next_compatible(blob, 0, COMPAT_NVIDIA_TEGRA124_DC);
if (node < 0)
return -ENOENT;
dc_ctlr = (struct dc_ctlr *)fdtdec_get_addr(blob, node, "reg");
if (fdtdec_decode_display_timing(blob, node, 0, timing))
return -EINVAL;
ret = display_update_config_from_edid(dp_dev, &panel_bpp, timing);
if (ret) {
debug("%s: Failed to decode EDID, using defaults\n", __func__);
dump_config(panel_bpp, timing);
}
if (!get_backlight_info(blob, &vdd_gpio, &enable_gpio, &pwm)) {
dm_gpio_set_value(&vdd_gpio, 1);
debug("%s: backlight vdd setting gpio %08x to %d\n",
__func__, gpio_get_number(&vdd_gpio), 1);
}
/*
* The plld is programmed with the assumption of the SHIFT_CLK_DIVIDER
* and PIXEL_CLK_DIVIDER are zero (divide by 1). See the
* update_display_mode() for detail.
*/
plld_rate = clock_set_display_rate(timing->pixelclock.typ * 2);
if (plld_rate == 0) {
printf("dc: clock init failed\n");
return -EIO;
} else if (plld_rate != timing->pixelclock.typ * 2) {
debug("dc: plld rounded to %u\n", plld_rate);
timing->pixelclock.typ = plld_rate / 2;
}
/* Init dc */
ret = tegra_dc_init(dc_ctlr);
if (ret) {
debug("dc: init failed\n");
return ret;
}
/* Configure dc mode */
ret = update_display_mode(dc_ctlr, timing, href_to_sync, vref_to_sync);
if (ret) {
debug("dc: failed to configure display mode\n");
return ret;
}
/* Enable dp */
ret = display_enable(dp_dev, panel_bpp, timing);
if (ret)
return ret;
ret = update_window(dc_ctlr, (ulong)lcdbase, fb_bits_per_pixel, timing);
if (ret)
return ret;
/* Set up Tegra PWM to drive the panel backlight */
pwm_enable(pwm, 0, 220, 0x2e);
udelay(10 * 1000);
if (dm_gpio_is_valid(&enable_gpio)) {
dm_gpio_set_value(&enable_gpio, 1);
debug("%s: backlight enable setting gpio %08x to %d\n",
__func__, gpio_get_number(&enable_gpio), 1);
}
return 0;
}
static int display_init(struct udevice *dev, void *lcdbase,
int fb_bits_per_pixel, struct display_timing *timing)
{
struct display_plat *disp_uc_plat;
struct dc_ctlr *dc_ctlr;
struct udevice *dp_dev;
const int href_to_sync = 1, vref_to_sync = 1;
int panel_bpp = 18; /* default 18 bits per pixel */
u32 plld_rate;
int ret;
/*
* Before we probe the display device (eDP), tell it that this device
* is the source of the display data.
*/
ret = uclass_find_first_device(UCLASS_DISPLAY, &dp_dev);
if (ret) {
debug("%s: device '%s' display not found (ret=%d)\n", __func__,
dev->name, ret);
return ret;
}
disp_uc_plat = dev_get_uclass_platdata(dp_dev);
debug("Found device '%s', disp_uc_priv=%p\n", dp_dev->name,
disp_uc_plat);
disp_uc_plat->src_dev = dev;
ret = uclass_get_device(UCLASS_DISPLAY, 0, &dp_dev);
if (ret) {
debug("%s: Failed to probe eDP, ret=%d\n", __func__, ret);
return ret;
}
dc_ctlr = (struct dc_ctlr *)dev_read_addr(dev);
if (ofnode_decode_display_timing(dev_ofnode(dev), 0, timing)) {
debug("%s: Failed to decode display timing\n", __func__);
return -EINVAL;
}
ret = display_update_config_from_edid(dp_dev, &panel_bpp, timing);
if (ret) {
debug("%s: Failed to decode EDID, using defaults\n", __func__);
dump_config(panel_bpp, timing);
}
/*
* The plld is programmed with the assumption of the SHIFT_CLK_DIVIDER
* and PIXEL_CLK_DIVIDER are zero (divide by 1). See the
* update_display_mode() for detail.
*/
plld_rate = clock_set_display_rate(timing->pixelclock.typ * 2);
if (plld_rate == 0) {
printf("dc: clock init failed\n");
return -EIO;
} else if (plld_rate != timing->pixelclock.typ * 2) {
debug("dc: plld rounded to %u\n", plld_rate);
timing->pixelclock.typ = plld_rate / 2;
}
/* Init dc */
ret = tegra_dc_init(dc_ctlr);
if (ret) {
debug("dc: init failed\n");
return ret;
}
/* Configure dc mode */
ret = update_display_mode(dc_ctlr, timing, href_to_sync, vref_to_sync);
if (ret) {
debug("dc: failed to configure display mode\n");
return ret;
}
/* Enable dp */
ret = display_enable(dp_dev, panel_bpp, timing);
if (ret) {
debug("dc: failed to enable display: ret=%d\n", ret);
return ret;
}
ret = update_window(dc_ctlr, (ulong)lcdbase, fb_bits_per_pixel, timing);
if (ret) {
debug("dc: failed to update window\n");
return ret;
}
debug("%s: ready\n", __func__);
return 0;
}