| /* SPDX-License-Identifier: GPL-2.0-or-later */ |
| |
| #include <bootstate.h> |
| #include <arch/mmio.h> |
| #include <delay.h> |
| #include <bootmode.h> |
| #include <device/device.h> |
| #include <device/pci.h> |
| #include <soc/pci_devs.h> |
| #include <drivers/intel/gma/i915_reg.h> |
| |
| static void panel_power_on(uintptr_t igd_bar) |
| { |
| setbits32((void *)(igd_bar + PCH_PP_CONTROL), PANEL_POWER_ON); |
| } |
| |
| static void panel_reset_assert(uintptr_t igd_bar) |
| { |
| clrsetbits32((void *)(igd_bar + PCH_GPIOB), |
| GPIO_CLOCK_VAL_OUT, |
| GPIO_CLOCK_DIR_MASK | GPIO_CLOCK_DIR_OUT | GPIO_CLOCK_VAL_MASK); |
| } |
| |
| static void panel_reset_deassert(uintptr_t igd_bar) |
| { |
| const uint32_t data32 = GPIO_CLOCK_VAL_OUT | |
| GPIO_CLOCK_DIR_MASK | GPIO_CLOCK_DIR_OUT | GPIO_CLOCK_VAL_MASK; |
| setbits32((void *)(igd_bar + PCH_GPIOB), data32); |
| } |
| |
| /* |
| * Bugzzy uses panel-built-in touch screen, it needs to set panel power and |
| * reset signal to high for touch screen to work. |
| * On user mode, coreboot doesn't initialize graphics since there is no screen |
| * display before OS. We would add this WA to initialize required signals on |
| * user mode. |
| */ |
| static void wa_init_display_signal(void *unused) |
| { |
| struct device *igd_dev = pcidev_path_on_root(SA_DEVFN_IGD); |
| uintptr_t igd_bar; |
| |
| if (display_init_required() || !igd_dev) |
| return; |
| |
| igd_bar = find_resource(igd_dev, PCI_BASE_ADDRESS_0)->base; |
| if (!igd_bar) |
| return; |
| |
| panel_power_on(igd_bar); |
| mdelay(20); |
| panel_reset_deassert(igd_bar); |
| mdelay(2); |
| panel_reset_assert(igd_bar); |
| mdelay(2); |
| panel_reset_deassert(igd_bar); |
| } |
| |
| BOOT_STATE_INIT_ENTRY(BS_POST_DEVICE, BS_ON_ENTRY, wa_init_display_signal, NULL); |