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https://github.com/brain-hackers/u-boot-brain
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![Thierry Reding](/assets/img/avatar_default.png)
Instead of storing the computed line length in a local variable, store it in the global lcd_line_length variable to make sure the LCD subsystem can properly draw content for the display resolution. This probably wasn't noticed yet because the only board where LCD support is currently enabled is Seaboard, which runs at a 1366x768 resolution. As it happens this is the maximum resolution supported and also the default that is used to initialize the framebuffer before the configuration from DT is available. Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de> Signed-off-by: Tom Warren <twarren@nvidia.com>
380 lines
9.8 KiB
C
380 lines
9.8 KiB
C
/*
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* Copyright (c) 2011 The Chromium OS Authors.
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <common.h>
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#include <fdtdec.h>
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#include <lcd.h>
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#include <asm/system.h>
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#include <asm/gpio.h>
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#include <asm/arch/clock.h>
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#include <asm/arch/funcmux.h>
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#include <asm/arch/pinmux.h>
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#include <asm/arch/pwm.h>
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#include <asm/arch/display.h>
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#include <asm/arch-tegra/timer.h>
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DECLARE_GLOBAL_DATA_PTR;
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/* These are the stages we go throuh in enabling the LCD */
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enum stage_t {
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STAGE_START,
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STAGE_PANEL_VDD,
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STAGE_LVDS,
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STAGE_BACKLIGHT_VDD,
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STAGE_PWM,
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STAGE_BACKLIGHT_EN,
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STAGE_DONE,
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};
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static enum stage_t stage; /* Current stage we are at */
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static unsigned long timer_next; /* Time we can move onto next stage */
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/* Our LCD config, set up in handle_stage() */
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static struct fdt_panel_config config;
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struct fdt_disp_config *disp_config; /* Display controller config */
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enum {
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/* Maximum LCD size we support */
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LCD_MAX_WIDTH = 1366,
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LCD_MAX_HEIGHT = 768,
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LCD_MAX_LOG2_BPP = 4, /* 2^4 = 16 bpp */
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};
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int lcd_line_length;
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int lcd_color_fg;
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int lcd_color_bg;
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void *lcd_base; /* Start of framebuffer memory */
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void *lcd_console_address; /* Start of console buffer */
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short console_col;
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short console_row;
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vidinfo_t panel_info = {
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/* Insert a value here so that we don't end up in the BSS */
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.vl_col = -1,
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};
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char lcd_cursor_enabled;
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ushort lcd_cursor_width;
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ushort lcd_cursor_height;
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#ifndef CONFIG_OF_CONTROL
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#error "You must enable CONFIG_OF_CONTROL to get Tegra LCD support"
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#endif
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void lcd_cursor_size(ushort width, ushort height)
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{
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lcd_cursor_width = width;
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lcd_cursor_height = height;
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}
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void lcd_toggle_cursor(void)
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{
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ushort x, y;
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uchar *dest;
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ushort row;
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x = console_col * lcd_cursor_width;
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y = console_row * lcd_cursor_height;
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dest = (uchar *)(lcd_base + y * lcd_line_length + x * (1 << LCD_BPP) /
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8);
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for (row = 0; row < lcd_cursor_height; ++row, dest += lcd_line_length) {
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ushort *d = (ushort *)dest;
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ushort color;
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int i;
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for (i = 0; i < lcd_cursor_width; ++i) {
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color = *d;
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color ^= lcd_color_fg;
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*d = color;
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++d;
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}
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}
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}
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void lcd_cursor_on(void)
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{
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lcd_cursor_enabled = 1;
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lcd_toggle_cursor();
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}
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void lcd_cursor_off(void)
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{
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lcd_cursor_enabled = 0;
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lcd_toggle_cursor();
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}
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char lcd_is_cursor_enabled(void)
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{
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return lcd_cursor_enabled;
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}
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static void update_panel_size(struct fdt_disp_config *config)
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{
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panel_info.vl_col = config->width;
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panel_info.vl_row = config->height;
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panel_info.vl_bpix = config->log2_bpp;
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}
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/*
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* Main init function called by lcd driver.
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* Inits and then prints test pattern if required.
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*/
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void lcd_ctrl_init(void *lcdbase)
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{
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int type = DCACHE_OFF;
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int size;
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assert(disp_config);
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lcd_base = (void *)disp_config->frame_buffer;
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/* Make sure that we can acommodate the selected LCD */
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assert(disp_config->width <= LCD_MAX_WIDTH);
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assert(disp_config->height <= LCD_MAX_HEIGHT);
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assert(disp_config->log2_bpp <= LCD_MAX_LOG2_BPP);
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if (disp_config->width <= LCD_MAX_WIDTH
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&& disp_config->height <= LCD_MAX_HEIGHT
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&& disp_config->log2_bpp <= LCD_MAX_LOG2_BPP)
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update_panel_size(disp_config);
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size = lcd_get_size(&lcd_line_length);
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/* Set up the LCD caching as requested */
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if (config.cache_type & FDT_LCD_CACHE_WRITE_THROUGH)
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type = DCACHE_WRITETHROUGH;
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else if (config.cache_type & FDT_LCD_CACHE_WRITE_BACK)
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type = DCACHE_WRITEBACK;
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mmu_set_region_dcache_behaviour(disp_config->frame_buffer, size, type);
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/* Enable flushing after LCD writes if requested */
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lcd_set_flush_dcache(config.cache_type & FDT_LCD_CACHE_FLUSH);
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debug("LCD frame buffer at %p\n", lcd_base);
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}
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ulong calc_fbsize(void)
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{
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return (panel_info.vl_col * panel_info.vl_row *
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NBITS(panel_info.vl_bpix)) / 8;
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}
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void lcd_setcolreg(ushort regno, ushort red, ushort green, ushort blue)
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{
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}
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void tegra_lcd_early_init(const void *blob)
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{
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/*
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* Go with the maximum size for now. We will fix this up after
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* relocation. These values are only used for memory alocation.
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*/
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panel_info.vl_col = LCD_MAX_WIDTH;
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panel_info.vl_row = LCD_MAX_HEIGHT;
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panel_info.vl_bpix = LCD_MAX_LOG2_BPP;
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}
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/**
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* Decode the panel information from the fdt.
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*
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* @param blob fdt blob
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* @param config structure to store fdt config into
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* @return 0 if ok, -ve on error
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*/
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static int fdt_decode_lcd(const void *blob, struct fdt_panel_config *config)
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{
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int display_node;
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disp_config = tegra_display_get_config();
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if (!disp_config) {
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debug("%s: Display controller is not configured\n", __func__);
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return -1;
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}
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display_node = disp_config->panel_node;
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if (display_node < 0) {
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debug("%s: No panel configuration available\n", __func__);
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return -1;
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}
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config->pwm_channel = pwm_request(blob, display_node, "nvidia,pwm");
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if (config->pwm_channel < 0) {
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debug("%s: Unable to request PWM channel\n", __func__);
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return -1;
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}
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config->cache_type = fdtdec_get_int(blob, display_node,
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"nvidia,cache-type",
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FDT_LCD_CACHE_WRITE_BACK_FLUSH);
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/* These GPIOs are all optional */
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fdtdec_decode_gpio(blob, display_node, "nvidia,backlight-enable-gpios",
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&config->backlight_en);
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fdtdec_decode_gpio(blob, display_node, "nvidia,lvds-shutdown-gpios",
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&config->lvds_shutdown);
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fdtdec_decode_gpio(blob, display_node, "nvidia,backlight-vdd-gpios",
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&config->backlight_vdd);
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fdtdec_decode_gpio(blob, display_node, "nvidia,panel-vdd-gpios",
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&config->panel_vdd);
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return fdtdec_get_int_array(blob, display_node, "nvidia,panel-timings",
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config->panel_timings, FDT_LCD_TIMINGS);
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}
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/**
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* Handle the next stage of device init
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*/
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static int handle_stage(const void *blob)
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{
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debug("%s: stage %d\n", __func__, stage);
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/* do the things for this stage */
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switch (stage) {
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case STAGE_START:
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/* Initialize the Tegra display controller */
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if (tegra_display_probe(gd->fdt_blob, (void *)gd->fb_base)) {
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printf("%s: Failed to probe display driver\n",
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__func__);
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return -1;
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}
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/* get panel details */
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if (fdt_decode_lcd(blob, &config)) {
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printf("No valid LCD information in device tree\n");
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return -1;
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}
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/*
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* It is possible that the FDT has requested that the LCD be
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* disabled. We currently don't support this. It would require
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* changes to U-Boot LCD subsystem to have LCD support
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* compiled in but not used. An easier option might be to
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* still have a frame buffer, but leave the backlight off and
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* remove all mention of lcd in the stdout environment
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* variable.
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*/
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funcmux_select(PERIPH_ID_DISP1, FUNCMUX_DEFAULT);
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fdtdec_setup_gpio(&config.panel_vdd);
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fdtdec_setup_gpio(&config.lvds_shutdown);
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fdtdec_setup_gpio(&config.backlight_vdd);
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fdtdec_setup_gpio(&config.backlight_en);
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/*
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* TODO: If fdt includes output flag we can omit this code
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* since fdtdec_setup_gpio will do it for us.
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*/
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if (fdt_gpio_isvalid(&config.panel_vdd))
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gpio_direction_output(config.panel_vdd.gpio, 0);
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if (fdt_gpio_isvalid(&config.lvds_shutdown))
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gpio_direction_output(config.lvds_shutdown.gpio, 0);
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if (fdt_gpio_isvalid(&config.backlight_vdd))
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gpio_direction_output(config.backlight_vdd.gpio, 0);
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if (fdt_gpio_isvalid(&config.backlight_en))
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gpio_direction_output(config.backlight_en.gpio, 0);
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break;
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case STAGE_PANEL_VDD:
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if (fdt_gpio_isvalid(&config.panel_vdd))
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gpio_direction_output(config.panel_vdd.gpio, 1);
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break;
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case STAGE_LVDS:
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if (fdt_gpio_isvalid(&config.lvds_shutdown))
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gpio_set_value(config.lvds_shutdown.gpio, 1);
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break;
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case STAGE_BACKLIGHT_VDD:
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if (fdt_gpio_isvalid(&config.backlight_vdd))
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gpio_set_value(config.backlight_vdd.gpio, 1);
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break;
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case STAGE_PWM:
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/* Enable PWM at 15/16 high, 32768 Hz with divider 1 */
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pinmux_set_func(PINGRP_GPU, PMUX_FUNC_PWM);
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pinmux_tristate_disable(PINGRP_GPU);
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pwm_enable(config.pwm_channel, 32768, 0xdf, 1);
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break;
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case STAGE_BACKLIGHT_EN:
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if (fdt_gpio_isvalid(&config.backlight_en))
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gpio_set_value(config.backlight_en.gpio, 1);
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break;
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case STAGE_DONE:
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break;
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}
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/* set up timer for next stage */
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timer_next = timer_get_us();
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if (stage < FDT_LCD_TIMINGS)
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timer_next += config.panel_timings[stage] * 1000;
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/* move to next stage */
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stage++;
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return 0;
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}
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int tegra_lcd_check_next_stage(const void *blob, int wait)
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{
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if (stage == STAGE_DONE)
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return 0;
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do {
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/* wait if we need to */
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debug("%s: stage %d\n", __func__, stage);
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if (stage != STAGE_START) {
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int delay = timer_next - timer_get_us();
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if (delay > 0) {
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if (wait)
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udelay(delay);
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else
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return 0;
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}
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}
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if (handle_stage(blob))
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return -1;
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} while (wait && stage != STAGE_DONE);
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if (stage == STAGE_DONE)
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debug("%s: LCD init complete\n", __func__);
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return 0;
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}
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void lcd_enable(void)
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{
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/*
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* Backlight and power init will be done separately in
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* tegra_lcd_check_next_stage(), which should be called in
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* board_late_init().
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*
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* U-Boot code supports only colour depth, selected at compile time.
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* The device tree setting should match this. Otherwise the display
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* will not look right, and U-Boot may crash.
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*/
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if (disp_config->log2_bpp != LCD_BPP) {
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printf("%s: Error: LCD depth configured in FDT (%d = %dbpp)"
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" must match setting of LCD_BPP (%d)\n", __func__,
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disp_config->log2_bpp, disp_config->bpp, LCD_BPP);
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}
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}
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