static int tegra_lcd_probe(struct udevice *dev) { struct video_uc_platdata *plat = dev_get_uclass_platdata(dev); struct video_priv *uc_priv = dev_get_uclass_priv(dev); struct tegra_lcd_priv *priv = dev_get_priv(dev); const void *blob = gd->fdt_blob; int type = DCACHE_OFF; /* Initialize the Tegra display controller */ if (tegra_display_probe(blob, priv, (void *)plat->base)) { printf("%s: Failed to probe display driver\n", __func__); return -1; } tegra_lcd_check_next_stage(blob, priv, 1); /* Set up the LCD caching as requested */ if (priv->cache_type & FDT_LCD_CACHE_WRITE_THROUGH) type = DCACHE_WRITETHROUGH; else if (priv->cache_type & FDT_LCD_CACHE_WRITE_BACK) type = DCACHE_WRITEBACK; mmu_set_region_dcache_behaviour(priv->frame_buffer, plat->size, type); /* Enable flushing after LCD writes if requested */ video_set_flush_dcache(dev, priv->cache_type & FDT_LCD_CACHE_FLUSH); uc_priv->xsize = priv->width; uc_priv->ysize = priv->height; uc_priv->bpix = priv->log2_bpp; debug("LCD frame buffer at %pa, size %x\n", &priv->frame_buffer, plat->size); return 0; }
/** * Handle the next stage of device init */ static int handle_stage(const void *blob) { debug("%s: stage %d\n", __func__, stage); /* do the things for this stage */ switch (stage) { case STAGE_START: /* Initialize the Tegra display controller */ if (tegra_display_probe(gd->fdt_blob, (void *)gd->fb_base)) { printf("%s: Failed to probe display driver\n", __func__); return -1; } /* get panel details */ if (fdt_decode_lcd(blob, &config)) { printf("No valid LCD information in device tree\n"); return -1; } /* * It is possible that the FDT has requested that the LCD be * disabled. We currently don't support this. It would require * changes to U-Boot LCD subsystem to have LCD support * compiled in but not used. An easier option might be to * still have a frame buffer, but leave the backlight off and * remove all mention of lcd in the stdout environment * variable. */ funcmux_select(PERIPH_ID_DISP1, FUNCMUX_DEFAULT); fdtdec_setup_gpio(&config.panel_vdd); fdtdec_setup_gpio(&config.lvds_shutdown); fdtdec_setup_gpio(&config.backlight_vdd); fdtdec_setup_gpio(&config.backlight_en); /* * TODO: If fdt includes output flag we can omit this code * since fdtdec_setup_gpio will do it for us. */ if (fdt_gpio_isvalid(&config.panel_vdd)) gpio_direction_output(config.panel_vdd.gpio, 0); if (fdt_gpio_isvalid(&config.lvds_shutdown)) gpio_direction_output(config.lvds_shutdown.gpio, 0); if (fdt_gpio_isvalid(&config.backlight_vdd)) gpio_direction_output(config.backlight_vdd.gpio, 0); if (fdt_gpio_isvalid(&config.backlight_en)) gpio_direction_output(config.backlight_en.gpio, 0); break; case STAGE_PANEL_VDD: if (fdt_gpio_isvalid(&config.panel_vdd)) gpio_direction_output(config.panel_vdd.gpio, 1); break; case STAGE_LVDS: if (fdt_gpio_isvalid(&config.lvds_shutdown)) gpio_set_value(config.lvds_shutdown.gpio, 1); break; case STAGE_BACKLIGHT_VDD: if (fdt_gpio_isvalid(&config.backlight_vdd)) gpio_set_value(config.backlight_vdd.gpio, 1); break; case STAGE_PWM: /* Enable PWM at 15/16 high, 32768 Hz with divider 1 */ pinmux_set_func(PINGRP_GPU, PMUX_FUNC_PWM); pinmux_tristate_disable(PINGRP_GPU); pwm_enable(config.pwm_channel, 32768, 0xdf, 1); break; case STAGE_BACKLIGHT_EN: if (fdt_gpio_isvalid(&config.backlight_en)) gpio_set_value(config.backlight_en.gpio, 1); break; case STAGE_DONE: break; } /* set up timer for next stage */ timer_next = timer_get_us(); if (stage < FDT_LCD_TIMINGS) timer_next += config.panel_timings[stage] * 1000; /* move to next stage */ stage++; return 0; }