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skylake: Increase IGD stolen size to 64MB 

The FBC hardware for skylake does not have access to the bios_reserved
range so it always assumes 8MB is used and so the kernel will
therefore need to avoid using the last 8MB of the stolen window.
With the default stolen size of 32MB(-8MB) there is not enough space
for FBC to work with a high resolution panel.

Kernel reference:
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=a9da512b3ed73045253afd778e40d4298f42905b

BUG=chrome-os-partner:50396
BRANCH=glados
TEST=build and boot on chell DVT

Change-Id: I3049d7d9e7c551aad5b8fd1630d5fbd88ccb2692
Signed-off-by: Patrick Georgi <pgeorgi@google.com>
Original-Commit-Id: fff1f4b35e23e77cdc72c5bcc290f199494cdbbb
Original-Change-Id: If468cca5759a320f3cd2d7eb09f4bcc0117b24cb
Original-Signed-off-by: Duncan Laurie <dlaurie@chromium.org>
Original-Reviewed-on: https://chromium-review.googlesource.com/328813
Original-Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://review.coreboot.org/13833
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
This commit is contained in:
Duncan Laurie 2016-02-20 09:10:53 -08:00 committed by Martin Roth
parent 689b26f57b
commit efcddd9717
1 changed files with 9 additions and 0 deletions
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9
src/soc/intel/skylake/romstage/romstage.c
View File

@ -85,6 +85,15 @@ void soc_memory_init_params(struct romstage_params *params,
dev = dev_find_slot(0, PCI_DEVFN(PCH_DEV_SLOT_LPC, 0)); dev = dev_find_slot(0, PCI_DEVFN(PCH_DEV_SLOT_LPC, 0));
config = dev->chip_info; config = dev->chip_info;
/*
* Set IGD stolen size to 64MB. The FBC hardware for skylake does not
* have access to the bios_reserved range so it always assumes 8MB is
* used and so the kernel will avoid the last 8MB of the stolen window.
* With the default stolen size of 32MB(-8MB) there is not enough space
* for FBC to work with a high resolution panel.
*/
upd->IgdDvmt50PreAlloc = 2;
upd->MmioSize = 0x800; /* 2GB in MB */ upd->MmioSize = 0x800; /* 2GB in MB */
upd->TsegSize = CONFIG_SMM_TSEG_SIZE; upd->TsegSize = CONFIG_SMM_TSEG_SIZE;
upd->IedSize = CONFIG_IED_REGION_SIZE; upd->IedSize = CONFIG_IED_REGION_SIZE;