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The Bayhub LV2 has a known errata wherein PCI config registers at
offsets 0x234, 0x238, and 0x24C will only correctly accept writes
when they are addressed via a DWORD (32-bit) wide write operation
on the PCIe bus. Offset 0x234 is the LTR max snoop and max no-snoop
latency register, therefore add a finalize callback to this driver
which will program the LTR max-snoop/no-snoop register with a 32-bit
write using the values from pciexp_get_ltr_max_latencies().
BUG=b:204343849
TEST=verified the PCI config space writes took effect on google/taeko
Change-Id: I1813f798faa534fb212cb1a074bc7bcadd17a517
Signed-off-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/60016
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Menzel <paulepanter@mailbox.org>
Reviewed-by: Nick Vaccaro <nvaccaro@google.com>
Reviewed-by: Karthik Ramasubramanian <kramasub@google.com>
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coreboot sets up CLK_PM, ASPM, and L1ss automatically based on related
bits in "Link Capability Register" and "L1 PM Substates Capabilities
Register". coreboot overrides these configs even if the driver sets
them. Therefore, setting up CLK_PM, ASPM, and L1ss in the driver is
redundant and useless.
BUG=b:177955523
BRANCH=zork
TEST="lspci -vvvv" prints are identical with and without this patch;
LV2_LINK_CTRL(0x90) is 0x00110102 with and without this patch.
Signed-off-by: Victor Ding <victording@google.com>
Change-Id: I17c19f4271da426ac2b926b948378dc88131e95a
Reviewed-on: https://review.coreboot.org/c/coreboot/+/50871
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: EricR Lai <ericr_lai@compal.corp-partner.google.com>
Reviewed-by: Kangheui Won <khwon@chromium.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
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coreboot sets up certain configs (e.g. L1ss) based on the device's
reported capacities; however, this BayHub lv2 driver modifies some
of its capacities after coreboot uses them. Therefore, coreboot may
make incorrect configs based on out-of-date capacities.
This patch moves the driver from ".init" to ".enable" so that the
capacities are set before the rest of coreboot queries them.
BUG=b:177955523
BRANCH=zork
TEST="lspci -vvvv" reported "PCI-PM_L1.2-" and "ASPM_L1.2-" on L1SubCtl1
of both PCI device "00:01.3" and "02.00.0"
Signed-off-by: Victor Ding <victording@google.com>
Change-Id: I857b7c7c6732bbd26de561052affa3a3e7e25737
Reviewed-on: https://review.coreboot.org/c/coreboot/+/50869
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Kangheui Won <khwon@chromium.org>
Reviewed-by: EricR Lai <ericr_lai@compal.corp-partner.google.com>
Reviewed-by: John Su <john_su@compal.corp-partner.google.com>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
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Add a driver which puts the device into power-saving mode.
BUG=b:177955523
BRANCH=zork
TEST=boot and see this message:
BayHub LV2: Power-saving enabled 110102
Signed-off-by: John Su <john_su@compal.corp-partner.google.com>
Change-Id: Idc1340b1a6fe7063d16c8ea16488d6e2b8b308cc
Reviewed-on: https://review.coreboot.org/c/coreboot/+/49783
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
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