Note: (a) With this series, all downstream devices should work w/o DT changes.
Only if the user desires L1SS savings and has an L1SS-capable
device is a DT change required (brcm,enable-l1ss).
(b) No code changes between V2->V3 except to remove a dev_info()
and change the string of another dev_info().
v3 -- Rewrote commit msgs and comments refering panics if L1SS
is enabled/disabled; the code snippet that unadvertises L1SS
eliminates the panic scenario. (Bjorn)
-- Add reference for "400ns of CLKREQ# assertion" blurb (Bjorn)
-- Put binding names in DT commit Subject (Bjorn)
-- Add a verb to a commit's subject line (Bjorn)
-- s/accomodat(\w+)/accommodat$1/g (Bjorn)
-- Rewrote commit msgs and comments refering panics if L1SS
is enabled/disabled; the code snippet that unadvertises L1SS
eliminates the panic scenario. (Bjorn)
v2 -- Changed binding property 'brcm,completion-timeout-msec' to
'brcm,completion-timeout-us'. (StefanW for standard suffix).
-- Warn when clamping timeout value, and include clamped
region in message. Also add min and max in YAML. (StefanW)
-- Qualify description of "brcm,completion-timeout-us" so that
it refers to PCIe transactions. (StefanW)
-- Remvove mention of Linux specifics in binding description. (StefanW)
-- s/clkreq#/CLKREQ#/g (Bjorn)
-- Refactor completion-timeout-us code to compare max and min to
value given by the property (as opposed to the computed value).
v1 -- The current driver assumes the downstream devices can
provide CLKREQ# for ASPM. These commits accomodate devices
w/ or w/o clkreq# and also handle L1SS-capable devices.
-- The Raspian Linux folks have already been using a PCIe RC
property "brcm,enable-l1ss". These commits use the same
property, in a backward-compatible manner, and the implementaion
adds more detail and also automatically identifies devices w/o
a clkreq# signal, i.e. most devices plugged into an RPi CM4
IO board.
Jim Quinlan (3):
dt-bindings: PCI: brcmstb: brcm,{enable-l1ss,completion-timeout-us}
props
PCI: brcmstb: Configure HW CLKREQ# mode appropriate for downstream
device
PCI: brcmstb: Set PCIe transaction completion timeout
.../bindings/pci/brcm,stb-pcie.yaml | 16 +++
drivers/pci/controller/pcie-brcmstb.c | 99 +++++++++++++++++--
2 files changed, 105 insertions(+), 10 deletions(-)
base-commit: 76f598ba7d8e2bfb4855b5298caedd5af0c374a8
prerequisite-patch-id: f38de8681d8746126d60b3430eaf218d2dd169cd
prerequisite-patch-id: 23e13189f200358976abf5bf3600973a20cf386c
prerequisite-patch-id: edfbe6ea39ed6a4937e2cec3bb8ee0e60091546d
prerequisite-patch-id: c87dd155e8506a2a277726c47d85bf3fa83727d5
prerequisite-patch-id: 579841e1dc179517506a7a7c42e0e651b3bc3649
prerequisite-patch-id: b5b079998ea451821edffd7c52cd3d89d06046a1
prerequisite-patch-id: b51b3918e554e279b2ace1f68ed6b4176f8ccc24
prerequisite-patch-id: 333e5188fb27d0ed010f5359e83e539172a67690
prerequisite-patch-id: bb107ee7b4811a9719508ea667cad2466933dec0
--
2.17.1
