From: Rob Herring <robh@kernel.org>
To: Jim Quinlan <jim2101024@gmail.com>
Cc: "Krzysztof Kozlowski" <krzysztof.kozlowski@linaro.org>,
"Florian Fainelli" <f.fainelli@gmail.com>,
linux-pci@vger.kernel.org,
"Nicolas Saenz Julienne" <nsaenz@kernel.org>,
"Bjorn Helgaas" <bhelgaas@google.com>,
"Lorenzo Pieralisi" <lorenzo.pieralisi@arm.com>,
"Cyril Brulebois" <kibi@debian.org>,
"Phil Elwell" <phil@raspberrypi.com>,
bcm-kernel-feedback-list@broadcom.com,
james.quinlan@broadcom.com,
"Lorenzo Pieralisi" <lpieralisi@kernel.org>,
"Krzysztof Wilczyński" <kw@linux.com>,
"Krzysztof Kozlowski" <krzysztof.kozlowski+dt@linaro.org>,
"moderated list:BROADCOM BCM7XXX ARM ARCHITECTURE"
<linux-arm-kernel@lists.infradead.org>,
"moderated list:BROADCOM BCM2711/BCM2835 ARM ARCHITECTURE"
<linux-rpi-kernel@lists.infradead.org>,
"open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS"
<devicetree@vger.kernel.org>,
"open list" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v2 1/3] dt-bindings: PCI: brcmstb: Add two optional props
Date: Wed, 12 Apr 2023 10:37:23 -0500 [thread overview]
Message-ID: <20230412153723.GA2473030-robh@kernel.org> (raw)
In-Reply-To: <CANCKTBtZt9QRkT4yAW5LsfHGf5TTL7tQ025H42+PPEi-=rWE8A@mail.gmail.com>
On Wed, Apr 12, 2023 at 10:14:46AM -0400, Jim Quinlan wrote:
> On Wed, Apr 12, 2023 at 7:56 AM Krzysztof Kozlowski
> <krzysztof.kozlowski@linaro.org> wrote:
> >
> > On 12/04/2023 13:49, Florian Fainelli wrote:
> > >
> > >
> > > On 4/12/2023 1:09 AM, Krzysztof Kozlowski wrote:
> > >> On 11/04/2023 18:59, Jim Quinlan wrote:
> > >>> Regarding "brcm,enable-l1ss":
> > >>>
> > >>> The Broadcom STB/CM PCIe HW -- a core that is also used by RPi SOCs --
> > >>> requires the driver probe() to deliberately place the HW one of three
> > >>> CLKREQ# modes:
> > >>>
> > >>> (a) CLKREQ# driven by the RC unconditionally
> > >>> (b) CLKREQ# driven by the EP for ASPM L0s, L1
> > >>> (c) Bidirectional CLKREQ#, as used for L1 Substates (L1SS).
> > >>>
> > >>> The HW+driver can tell the difference between downstream devices that
> > >>> need (a) and (b), but does not know when to configure (c). Further, the
> > >>> HW may cause a CPU abort on boot if guesses wrong regarding the need for
> > >>> (c). So we introduce the boolean "brcm,enable-l1ss" property to indicate
> > >>> that (c) is desired. Setting this property only makes sense when the
> > >>> downstream device is L1SS-capable and the OS is configured to activate
> > >>> this mode (e.g. policy==superpowersave).
> > >>>
> > >>> This property is already present in the Raspian version of Linux, but the
> > >>> upstream driver implementaion that will follow adds more details and
> > >>
> > >> typo, implementation
> > >>
> > >>> discerns between (a) and (b).
> > >>>
> > >>> Regarding "brcm,completion-timeout-us"
> > >>>
> > >>> Our HW will cause a CPU abort if the L1SS exit time is longer than the
> > >>> PCIe transaction completion abort timeout. We've been asked to make this
> > >>> configurable, so we are introducing "brcm,completion-timeout-us".
> > >>>
> > >>> Signed-off-by: Jim Quinlan <jim2101024@gmail.com>
> > >>
> > >> What happened here? Where is the changelog?
> > >
> > > It is in the cover letter:
> > >
> > > https://lore.kernel.org/all/20230411165919.23955-1-jim2101024@gmail.com/
> > >
> > > but it does not look like the cover letter was copied to you or Rob.
> >
> > As you said, I did not get it.
>
> Yes, sorry about that; I use a wrapper over the "cocci_cc" script and
> I need to modify one or both scripts to send the cover to the
> superset of recipients in the constituent commits.
Try out 'b4'. It's much easier.
In any case, I don't read cover letters. Changes to a patch belong with
the patch.
Rob
next prev parent reply other threads:[~2023-04-12 15:37 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-04-11 16:59 [PATCH v2 0/3] PCI: brcmstb: CLKREQ# accomodations of downstream device Jim Quinlan
2023-04-11 16:59 ` [PATCH v2 1/3] dt-bindings: PCI: brcmstb: Add two optional props Jim Quinlan
2023-04-12 8:09 ` Krzysztof Kozlowski
2023-04-12 11:49 ` Florian Fainelli
2023-04-12 11:56 ` Krzysztof Kozlowski
2023-04-12 14:14 ` Jim Quinlan
2023-04-12 15:37 ` Rob Herring [this message]
2023-04-12 16:12 ` Florian Fainelli
2023-04-18 18:35 ` Rob Herring
2023-04-21 19:07 ` Konstantin Ryabitsev
2023-04-14 20:14 ` Bjorn Helgaas
2023-04-11 16:59 ` [PATCH v2 2/3] PCI: brcmstb: CLKREQ# accomodations of downstream device Jim Quinlan
2023-04-13 14:39 ` Cyril Brulebois
2023-04-13 14:57 ` Jim Quinlan
[not found] ` <20230413200646.ddgsoqgmaae343nl@mraw.org>
2023-04-14 12:14 ` Jim Quinlan
2023-04-14 12:27 ` Florian Fainelli
2023-04-14 13:31 ` Jim Quinlan
2023-04-14 16:19 ` Cyril Brulebois
2023-04-19 14:23 ` Jim Quinlan
2023-04-19 15:57 ` Cyril Brulebois
2023-04-13 14:58 ` Florian Fainelli
2023-04-14 20:27 ` Bjorn Helgaas
2023-04-14 20:33 ` Florian Fainelli
2023-04-17 21:41 ` Bjorn Helgaas
2023-04-14 23:14 ` Jim Quinlan
2023-04-11 16:59 ` [PATCH v2 3/3] PCI: brcmstb: Set PCIe transaction completion timeout Jim Quinlan
2023-04-12 0:26 ` Cyril Brulebois
2023-04-13 18:40 ` [PATCH v2 0/3] PCI: brcmstb: CLKREQ# accomodations of downstream device Florian Fainelli
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