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| author | Bin Meng <bmeng.cn@gmail.com> | 2015-10-01 00:36:04 -0700 |
|---|---|---|
| committer | Simon Glass <sjg@chromium.org> | 2015-10-21 07:46:25 -0600 |
| commit | 1f124eba11cb1619e6d575770756230484e47bf7 (patch) | |
| tree | 17162d5ac8901917b505736b240ce8bf907359d1 /arch/x86 | |
| parent | 5bf935925ba48711b1bf3e17338b6f2faf74f39d (diff) | |
| download | blackbird-obmc-uboot-1f124eba11cb1619e6d575770756230484e47bf7.tar.gz blackbird-obmc-uboot-1f124eba11cb1619e6d575770756230484e47bf7.zip | |
x86: Allow disabling IGD on Intel Queensbay
Add a Kconfig option to disable the Integrated Graphics Device (IGD)
so that it does not show in the PCI configuration space as a VGA
disaplay controller. This gives a chance for U-Boot to run PCI/PCIe
based graphics card's VGA BIOS and use that for the graphics console.
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Acked-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/cpu/queensbay/Kconfig | 8 | ||||
| -rw-r--r-- | arch/x86/cpu/queensbay/tnc.c | 19 | ||||
| -rw-r--r-- | arch/x86/include/asm/arch-queensbay/tnc.h | 5 |
3 files changed, 32 insertions, 0 deletions
diff --git a/arch/x86/cpu/queensbay/Kconfig b/arch/x86/cpu/queensbay/Kconfig index fbf85f233f..6136d75422 100644 --- a/arch/x86/cpu/queensbay/Kconfig +++ b/arch/x86/cpu/queensbay/Kconfig @@ -42,4 +42,12 @@ config CPU_ADDR_BITS int default 32 +config DISABLE_IGD + bool "Disable Integrated Graphics Device (IGD)" + help + Disable the Integrated Graphics Device (IGD) so that it does not + show in the PCI configuration space as a VGA disaplay controller. + This gives a chance for U-Boot to run PCI/PCIe based graphics + card's VGA BIOS and use that card for the graphics console. + endif diff --git a/arch/x86/cpu/queensbay/tnc.c b/arch/x86/cpu/queensbay/tnc.c index 9682cfff26..0c02a44f63 100644 --- a/arch/x86/cpu/queensbay/tnc.c +++ b/arch/x86/cpu/queensbay/tnc.c @@ -23,6 +23,16 @@ static void unprotect_spi_flash(void) x86_pci_write_config32(TNC_LPC, 0xd8, bc); } +static void __maybe_unused disable_igd(void) +{ + u32 gc; + + gc = x86_pci_read_config32(TNC_IGD, IGD_GC); + gc &= ~GMS_MASK; + gc |= VGA_DISABLE; + x86_pci_write_config32(TNC_IGD, IGD_GC, gc); +} + int arch_cpu_init(void) { int ret; @@ -39,6 +49,15 @@ int arch_cpu_init(void) return 0; } +int arch_early_init_r(void) +{ +#ifdef CONFIG_DISABLE_IGD + disable_igd(); +#endif + + return 0; +} + void cpu_irq_init(void) { struct tnc_rcba *rcba; diff --git a/arch/x86/include/asm/arch-queensbay/tnc.h b/arch/x86/include/asm/arch-queensbay/tnc.h index ad9a6c4892..23653949de 100644 --- a/arch/x86/include/asm/arch-queensbay/tnc.h +++ b/arch/x86/include/asm/arch-queensbay/tnc.h @@ -7,6 +7,11 @@ #ifndef _X86_ARCH_TNC_H_ #define _X86_ARCH_TNC_H_ +/* IGD Control Register */ +#define IGD_GC 0x50 +#define VGA_DISABLE 0x00020000 +#define GMS_MASK 0x00700000 + /* Memory BAR Enable */ #define MEM_BAR_EN 0x00000001 |
