diff options
| author | Angel Pons <th3fanbus@gmail.com> | 2020-08-29 02:52:09 +0200 |
|---|---|---|
| committer | Angel Pons <th3fanbus@gmail.com> | 2020-10-22 20:05:25 +0000 |
| commit | 84641c81834841fa6cdad19d06b06c05ba899825 (patch) | |
| tree | d845feb660275cfd59e8d6502d9f4f09bab85ac5 /src/northbridge/intel/haswell/Kconfig | |
| parent | 6c4028dd3ddf571ef2e992de8d9927b598f7cd6b (diff) | |
nb/intel/haswell: Add HASWELL_HIDE_PEG_FROM_MRC option
The MRC will perform PCI enumeration, and if it detects a VGA device in
a PEG slot, it will disable the IGD and not reserve any memory for it.
Since the memory map is locked by the time MRC finishes, the IGD can not
be enabled afterwards. Changing this behavior requires patching the MRC.
Hiding the PEG devices from MRC allows the IGD to be used even when a
dedicated graphics card is present. However, MRC will not program the
PEG AFE settings as it should, which can cause stability problems at
higher PCIe link speeds. Thus, restrict this workaround to only run when
the HASWELL_HIDE_PEG_FROM_MRC option is enabled. This allows the IGD to
be disabled and the PEG AFE settings to be programmed when a dedicated
graphics card is to be enabled, which results in increased stability.
The most ideal way to fix this problem for good is to implement native
platform init. Native init is necessary to make Nvidia Optimus usable.
Tested on Asrock B85M Pro4, using the PEG slot with a dedicated graphics
card as well as without. Graphics in both situations function properly.
Change-Id: I4d825b1c41d8705bfafe28d8ecb0a511788901f0
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/45534
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Nico Huber <nico.h@gmx.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Diffstat (limited to 'src/northbridge/intel/haswell/Kconfig')
| -rw-r--r-- | src/northbridge/intel/haswell/Kconfig | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/src/northbridge/intel/haswell/Kconfig b/src/northbridge/intel/haswell/Kconfig index 84be33df4e..04ab373ce2 100644 --- a/src/northbridge/intel/haswell/Kconfig +++ b/src/northbridge/intel/haswell/Kconfig @@ -78,6 +78,15 @@ config MRC_FILE The path and filename of the file to use as System Agent binary. +config HASWELL_HIDE_PEG_FROM_MRC + bool "Hide PEG devices from MRC to work around hardcoded MRC behavior" + default y + help + If set, hides all PEG devices from MRC. This allows the iGPU + to be used even when a dedicated graphics card is present. + However, it prevents MRC from programming PEG AFE registers, + which can make PEG devices unstable. When unsure, choose N. + config PRE_GRAPHICS_DELAY int "Graphics initialization delay in ms" default 0 |