u-boot/drivers/video/tegra124/display.c

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/*
* Copyright 2014 Google Inc.
*
* SPDX-License-Identifier: GPL-2.0+
*
* Extracted from Chromium coreboot commit 3f59b13d
*/
#include <common.h>
#include <dm.h>
#include <edid.h>
#include <errno.h>
#include <displayport.h>
#include <edid.h>
#include <fdtdec.h>
#include <lcd.h>
#include <asm/gpio.h>
#include <asm/io.h>
#include <asm/arch/clock.h>
#include <asm/arch/pwm.h>
#include <asm/arch-tegra/dc.h>
#include "displayport.h"
DECLARE_GLOBAL_DATA_PTR;
/* return in 1000ths of a Hertz */
static int tegra_dc_calc_refresh(const struct display_timing *timing)
{
int h_total, v_total, refresh;
int pclk = timing->pixelclock.typ;
h_total = timing->hactive.typ + timing->hfront_porch.typ +
timing->hback_porch.typ + timing->hsync_len.typ;
v_total = timing->vactive.typ + timing->vfront_porch.typ +
timing->vback_porch.typ + timing->vsync_len.typ;
if (!pclk || !h_total || !v_total)
return 0;
refresh = pclk / h_total;
refresh *= 1000;
refresh /= v_total;
return refresh;
}
static void print_mode(const struct display_timing *timing)
{
int refresh = tegra_dc_calc_refresh(timing);
debug("MODE:%dx%d@%d.%03uHz pclk=%d\n",
timing->hactive.typ, timing->vactive.typ, refresh / 1000,
refresh % 1000, timing->pixelclock.typ);
}
static int update_display_mode(struct dc_ctlr *disp_ctrl,
const struct display_timing *timing,
int href_to_sync, int vref_to_sync)
{
print_mode(timing);
writel(0x1, &disp_ctrl->disp.disp_timing_opt);
writel(vref_to_sync << 16 | href_to_sync,
&disp_ctrl->disp.ref_to_sync);
writel(timing->vsync_len.typ << 16 | timing->hsync_len.typ,
&disp_ctrl->disp.sync_width);
writel(((timing->vback_porch.typ - vref_to_sync) << 16) |
timing->hback_porch.typ, &disp_ctrl->disp.back_porch);
writel(((timing->vfront_porch.typ + vref_to_sync) << 16) |
timing->hfront_porch.typ, &disp_ctrl->disp.front_porch);
writel(timing->hactive.typ | (timing->vactive.typ << 16),
&disp_ctrl->disp.disp_active);
/**
* We want to use PLLD_out0, which is PLLD / 2:
* PixelClock = (PLLD / 2) / ShiftClockDiv / PixelClockDiv.
*
* Currently most panels work inside clock range 50MHz~100MHz, and PLLD
* has some requirements to have VCO in range 500MHz~1000MHz (see
* clock.c for more detail). To simplify calculation, we set
* PixelClockDiv to 1 and ShiftClockDiv to 1. In future these values
* may be calculated by clock_display, to allow wider frequency range.
*
* Note ShiftClockDiv is a 7.1 format value.
*/
const u32 shift_clock_div = 1;
writel((PIXEL_CLK_DIVIDER_PCD1 << PIXEL_CLK_DIVIDER_SHIFT) |
((shift_clock_div - 1) * 2) << SHIFT_CLK_DIVIDER_SHIFT,
&disp_ctrl->disp.disp_clk_ctrl);
debug("%s: PixelClock=%u, ShiftClockDiv=%u\n", __func__,
timing->pixelclock.typ, shift_clock_div);
return 0;
}
static u32 tegra_dc_poll_register(void *reg,
u32 mask, u32 exp_val, u32 poll_interval_us, u32 timeout_us)
{
u32 temp = timeout_us;
u32 reg_val = 0;
do {
udelay(poll_interval_us);
reg_val = readl(reg);
if (timeout_us > poll_interval_us)
timeout_us -= poll_interval_us;
else
break;
} while ((reg_val & mask) != exp_val);
if ((reg_val & mask) == exp_val)
return 0; /* success */
return temp;
}
int tegra_dc_sor_general_act(struct dc_ctlr *disp_ctrl)
{
writel(GENERAL_ACT_REQ, &disp_ctrl->cmd.state_ctrl);
if (tegra_dc_poll_register(&disp_ctrl->cmd.state_ctrl,
GENERAL_ACT_REQ, 0, 100,
DC_POLL_TIMEOUT_MS * 1000)) {
debug("dc timeout waiting for DC to stop\n");
return -ETIMEDOUT;
}
return 0;
}
static struct display_timing min_mode = {
.hsync_len = { .typ = 1 },
.vsync_len = { .typ = 1 },
.hback_porch = { .typ = 20 },
.vback_porch = { .typ = 0 },
.hactive = { .typ = 16 },
.vactive = { .typ = 16 },
.hfront_porch = { .typ = 1 },
.vfront_porch = { .typ = 2 },
};
/* Disable windows and set minimum raster timings */
void tegra_dc_sor_disable_win_short_raster(struct dc_ctlr *disp_ctrl,
int *dc_reg_ctx)
{
const int href_to_sync = 0, vref_to_sync = 1;
int selected_windows, i;
selected_windows = readl(&disp_ctrl->cmd.disp_win_header);
/* Store and clear window options */
for (i = 0; i < DC_N_WINDOWS; ++i) {
writel(WINDOW_A_SELECT << i, &disp_ctrl->cmd.disp_win_header);
dc_reg_ctx[i] = readl(&disp_ctrl->win.win_opt);
writel(0, &disp_ctrl->win.win_opt);
writel(WIN_A_ACT_REQ << i, &disp_ctrl->cmd.state_ctrl);
}
writel(selected_windows, &disp_ctrl->cmd.disp_win_header);
/* Store current raster timings and set minimum timings */
dc_reg_ctx[i++] = readl(&disp_ctrl->disp.ref_to_sync);
writel(href_to_sync | (vref_to_sync << 16),
&disp_ctrl->disp.ref_to_sync);
dc_reg_ctx[i++] = readl(&disp_ctrl->disp.sync_width);
writel(min_mode.hsync_len.typ | (min_mode.vsync_len.typ << 16),
&disp_ctrl->disp.sync_width);
dc_reg_ctx[i++] = readl(&disp_ctrl->disp.back_porch);
writel(min_mode.hback_porch.typ | (min_mode.vback_porch.typ << 16),
&disp_ctrl->disp.back_porch);
dc_reg_ctx[i++] = readl(&disp_ctrl->disp.front_porch);
writel(min_mode.hfront_porch.typ | (min_mode.vfront_porch.typ << 16),
&disp_ctrl->disp.front_porch);
dc_reg_ctx[i++] = readl(&disp_ctrl->disp.disp_active);
writel(min_mode.hactive.typ | (min_mode.vactive.typ << 16),
&disp_ctrl->disp.disp_active);
writel(GENERAL_ACT_REQ, &disp_ctrl->cmd.state_ctrl);
}
/* Restore previous windows status and raster timings */
void tegra_dc_sor_restore_win_and_raster(struct dc_ctlr *disp_ctrl,
int *dc_reg_ctx)
{
int selected_windows, i;
selected_windows = readl(&disp_ctrl->cmd.disp_win_header);
for (i = 0; i < DC_N_WINDOWS; ++i) {
writel(WINDOW_A_SELECT << i, &disp_ctrl->cmd.disp_win_header);
writel(dc_reg_ctx[i], &disp_ctrl->win.win_opt);
writel(WIN_A_ACT_REQ << i, &disp_ctrl->cmd.state_ctrl);
}
writel(selected_windows, &disp_ctrl->cmd.disp_win_header);
writel(dc_reg_ctx[i++], &disp_ctrl->disp.ref_to_sync);
writel(dc_reg_ctx[i++], &disp_ctrl->disp.sync_width);
writel(dc_reg_ctx[i++], &disp_ctrl->disp.back_porch);
writel(dc_reg_ctx[i++], &disp_ctrl->disp.front_porch);
writel(dc_reg_ctx[i++], &disp_ctrl->disp.disp_active);
writel(GENERAL_UPDATE, &disp_ctrl->cmd.state_ctrl);
}
static int tegra_depth_for_bpp(int bpp)
{
switch (bpp) {
case 32:
return COLOR_DEPTH_R8G8B8A8;
case 16:
return COLOR_DEPTH_B5G6R5;
default:
debug("Unsupported LCD bit depth");
return -1;
}
}
static int update_window(struct dc_ctlr *disp_ctrl,
u32 frame_buffer, int fb_bits_per_pixel,
const struct display_timing *timing)
{
const u32 colour_white = 0xffffff;
int colour_depth;
u32 val;
writel(WINDOW_A_SELECT, &disp_ctrl->cmd.disp_win_header);
writel(((timing->vactive.typ << 16) | timing->hactive.typ),
&disp_ctrl->win.size);
writel(((timing->vactive.typ << 16) |
(timing->hactive.typ * fb_bits_per_pixel / 8)),
&disp_ctrl->win.prescaled_size);
writel(((timing->hactive.typ * fb_bits_per_pixel / 8 + 31) /
32 * 32), &disp_ctrl->win.line_stride);
colour_depth = tegra_depth_for_bpp(fb_bits_per_pixel);
if (colour_depth == -1)
return -EINVAL;
writel(colour_depth, &disp_ctrl->win.color_depth);
writel(frame_buffer, &disp_ctrl->winbuf.start_addr);
writel(0x1000 << V_DDA_INC_SHIFT | 0x1000 << H_DDA_INC_SHIFT,
&disp_ctrl->win.dda_increment);
writel(colour_white, &disp_ctrl->disp.blend_background_color);
writel(CTRL_MODE_C_DISPLAY << CTRL_MODE_SHIFT,
&disp_ctrl->cmd.disp_cmd);
writel(WRITE_MUX_ACTIVE, &disp_ctrl->cmd.state_access);
val = GENERAL_ACT_REQ | WIN_A_ACT_REQ;
val |= GENERAL_UPDATE | WIN_A_UPDATE;
writel(val, &disp_ctrl->cmd.state_ctrl);
/* Enable win_a */
val = readl(&disp_ctrl->win.win_opt);
writel(val | WIN_ENABLE, &disp_ctrl->win.win_opt);
return 0;
}
static int tegra_dc_init(struct dc_ctlr *disp_ctrl)
{
/* do not accept interrupts during initialization */
writel(0x00000000, &disp_ctrl->cmd.int_mask);
writel(WRITE_MUX_ASSEMBLY | READ_MUX_ASSEMBLY,
&disp_ctrl->cmd.state_access);
writel(WINDOW_A_SELECT, &disp_ctrl->cmd.disp_win_header);
writel(0x00000000, &disp_ctrl->win.win_opt);
writel(0x00000000, &disp_ctrl->win.byte_swap);
writel(0x00000000, &disp_ctrl->win.buffer_ctrl);
writel(0x00000000, &disp_ctrl->win.pos);
writel(0x00000000, &disp_ctrl->win.h_initial_dda);
writel(0x00000000, &disp_ctrl->win.v_initial_dda);
writel(0x00000000, &disp_ctrl->win.dda_increment);
writel(0x00000000, &disp_ctrl->win.dv_ctrl);
writel(0x01000000, &disp_ctrl->win.blend_layer_ctrl);
writel(0x00000000, &disp_ctrl->win.blend_match_select);
writel(0x00000000, &disp_ctrl->win.blend_nomatch_select);
writel(0x00000000, &disp_ctrl->win.blend_alpha_1bit);
writel(0x00000000, &disp_ctrl->winbuf.start_addr_hi);
writel(0x00000000, &disp_ctrl->winbuf.addr_h_offset);
writel(0x00000000, &disp_ctrl->winbuf.addr_v_offset);
writel(0x00000000, &disp_ctrl->com.crc_checksum);
writel(0x00000000, &disp_ctrl->com.pin_output_enb[0]);
writel(0x00000000, &disp_ctrl->com.pin_output_enb[1]);
writel(0x00000000, &disp_ctrl->com.pin_output_enb[2]);
writel(0x00000000, &disp_ctrl->com.pin_output_enb[3]);
writel(0x00000000, &disp_ctrl->disp.disp_signal_opt0);
return 0;
}
static void dump_config(int panel_bpp, struct display_timing *timing)
{
printf("timing->hactive.typ = %d\n", timing->hactive.typ);
printf("timing->vactive.typ = %d\n", timing->vactive.typ);
printf("timing->pixelclock.typ = %d\n", timing->pixelclock.typ);
printf("timing->hfront_porch.typ = %d\n", timing->hfront_porch.typ);
printf("timing->hsync_len.typ = %d\n", timing->hsync_len.typ);
printf("timing->hback_porch.typ = %d\n", timing->hback_porch.typ);
printf("timing->vfront_porch.typ %d\n", timing->vfront_porch.typ);
printf("timing->vsync_len.typ = %d\n", timing->vsync_len.typ);
printf("timing->vback_porch.typ = %d\n", timing->vback_porch.typ);
printf("panel_bits_per_pixel = %d\n", panel_bpp);
}
static int display_update_config_from_edid(struct udevice *dp_dev,
int *panel_bppp,
struct display_timing *timing)
{
u8 buf[EDID_SIZE];
int bpc, ret;
ret = display_port_read_edid(dp_dev, buf, sizeof(buf));
if (ret < 0)
return ret;
ret = edid_get_timing(buf, ret, timing, &bpc);
if (ret)
return ret;
/* Use this information if valid */
if (bpc != -1)
*panel_bppp = bpc * 3;
return 0;
}
/* Somewhat torturous method */
static int get_backlight_info(const void *blob, struct gpio_desc *vdd,
struct gpio_desc *enable, int *pwmp)
{
int sor, panel, backlight, power;
const u32 *prop;
int len;
int ret;
*pwmp = 0;
sor = fdtdec_next_compatible(blob, 0, COMPAT_NVIDIA_TEGRA124_SOR);
if (sor < 0)
return -ENOENT;
panel = fdtdec_lookup_phandle(blob, sor, "nvidia,panel");
if (panel < 0)
return -ENOENT;
backlight = fdtdec_lookup_phandle(blob, panel, "backlight");
if (backlight < 0)
return -ENOENT;
ret = gpio_request_by_name_nodev(blob, backlight, "enable-gpios", 0,
enable, GPIOD_IS_OUT);
if (ret)
return ret;
prop = fdt_getprop(blob, backlight, "pwms", &len);
if (!prop || len != 3 * sizeof(u32))
return -EINVAL;
*pwmp = fdt32_to_cpu(prop[1]);
power = fdtdec_lookup_phandle(blob, backlight, "power-supply");
if (power < 0)
return -ENOENT;
ret = gpio_request_by_name_nodev(blob, power, "gpio", 0, vdd,
GPIOD_IS_OUT);
if (ret)
goto err;
return 0;
err:
dm_gpio_free(NULL, enable);
return ret;
}
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_PORT, 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_port_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;
}