[PATCH v7 0/3] PCI: brcmstb: Configure appropriate HW CLKREQ# mode

[Florian Fainelli]

On 11/9/23 11:13, Jim Quinlan wrote:
> v7 -- Manivannan Sadhasivam suggested (a) making the property look like a
>        network phy-mode and (b) keeping the code simple (not counting clkreq
>        signal appearances, un-advertising capabilites, etc).  This is
>        what I have done.  The property is now "brcm,clkreq-mode" and
>        the values may be one of "safe", "default", and "no-l1ss".  The
>        default setting is to employ the most capable power savings mode.
> 
> v6 -- No code has been changed.
>     -- Changed commit subject and comment in "#PERST" commit (Bjorn, Cyril)
>     -- Changed sign-off and author email address for all commits.
>        This was due to a change in Broadcom's upstreaming policy.
> 
> v5 -- Remove DT property "brcm,completion-timeout-us" from	
>        "DT bindings" commit.  Although this error may be reported	
>        as a completion timeout, its cause was traced to an	
>        internal bus timeout which may occur even when there is	
>        no PCIe access being processed.  We set a timeout of four	
>        seconds only if we are operating in "L1SS CLKREQ#" mode.
>     -- Correct CEM 2.0 reference provided by HW engineer,
>        s/3.2.5.2.5/3.2.5.2.2/ (Bjorn)
>     -- Add newline to dev_info() string (Stefan)
>     -- Change variable rval to unsigned (Stefan)
>     -- s/implementaion/implementation/ (Bjorn)
>     -- s/superpowersave/powersupersave/ (Bjorn)
>     -- Slightly modify message on "PERST#" commit.
>     -- Rebase to torvalds master
> 
> v4 -- New commit that asserts PERST# for 2711/RPi SOCs at PCIe RC
>        driver probe() time.  This is done in Raspian Linux and its
>        absence may be the cause of a failing test case.
>     -- New commit that removes stale comment.
> 
> 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.

For the entire series:

Tested-by: Florian Fainelli <florian.fainelli at broadcom.com>

on all of my available devices:

- SUNIX Co., Ltd. Multiport serial controller
- Broadcom BCM4331 Wi-Fi
- Broadcom BCM43224 Wi-Fi
- Broadcom BCM4322 Wi-Fi
- Qualcomm Atheros AR5008
- Broadcom BCM4366 Wi-Fi
- Marvell Technology Group Ltd. 88SE9125 PCIe SATA 6.0 Gb/s controller
- Intel 7260 Wi-Fi
- Intel Corporation 82574L Gigabit Network Connection
- Broadcom NetXtreme BCM5751 Gigabit Ethernet
- Pepperl+Fuchs RocketPort EXPRESS 8-port w/Octa Cable
- Micron/Crucial Technology P2 NVMe PCIe SSD
- ASM1184e PCIe Switch Port
-- 
Florian

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