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author | Bin Meng <bmeng.cn@gmail.com> | 2015-10-01 07:36:04 (GMT) |
---|---|---|
committer | Simon Glass <sjg@chromium.org> | 2015-10-21 13:46:25 (GMT) |
commit | 1f124eba11cb1619e6d575770756230484e47bf7 (patch) | |
tree | 17162d5ac8901917b505736b240ce8bf907359d1 /arch/x86/cpu/queensbay/tnc.c | |
parent | 5bf935925ba48711b1bf3e17338b6f2faf74f39d (diff) | |
download | u-boot-1f124eba11cb1619e6d575770756230484e47bf7.tar.xz |
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/cpu/queensbay/tnc.c')
-rw-r--r-- | arch/x86/cpu/queensbay/tnc.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/arch/x86/cpu/queensbay/tnc.c b/arch/x86/cpu/queensbay/tnc.c index 9682cff..0c02a44 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; |