linux-kernel - Re: [PATCH v4 2/2] firmware: arm_scmi: Support 'reg-io-width' property for shared memory

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Message-ID: <Zxop6E83YId0et5o@bogus>
Date: Thu, 24 Oct 2024 12:05:12 +0100
From: Sudeep Holla <sudeep.holla@....com>
To: Florian Fainelli <florian.fainelli@...adcom.com>
Cc: linux-arm-kernel@...ts.infradead.org, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Cristian Marussi <cristian.marussi@....com>,
	"open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" <devicetree@...r.kernel.org>,
	open list <linux-kernel@...r.kernel.org>,
	"open list:SYSTEM CONTROL & POWER/MANAGEMENT INTERFACE" <arm-scmi@...r.kernel.org>,
	justin.chen@...adcom.com, opendmb@...il.com,
	Florian Fainelli <f.fainelli@...il.com>, kapil.hali@...adcom.com,
	bcm-kernel-feedback-list@...adcom.com,
	Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH v4 2/2] firmware: arm_scmi: Support 'reg-io-width'
 property for shared memory

Gentle ping! Not sure if my earlier email got into spam or didn't land
in lore/ML. Just thought of checking again.

On Fri, Oct 18, 2024 at 01:57:09PM +0100, Sudeep Holla wrote:
> On Tue, Sep 03, 2024 at 04:40:00PM +0100, Sudeep Holla wrote:
> > On Tue, Aug 27, 2024 at 11:24:50AM -0700, Florian Fainelli wrote:
> > > Some shared memory areas might only support a certain access width,
> > > such as 32-bit, which memcpy_{from,to}_io() does not adhere to at least
> > > on ARM64 by making both 8-bit and 64-bit accesses to such memory.
> > >
> > > Update the shmem layer to support reading from and writing to such
> > > shared memory area using the specified I/O width in the Device Tree. The
> > > various transport layers making use of the shmem.c code are updated
> > > accordingly to pass the I/O accessors that they store.
> > >
> > 
> > This looks good to me now, much simpler. I will push this to -next soon,
> > but it won't be for v6.12. I have already sent PR for that. I want this
> > to be in -next for longer just to see if anyone has any comments and
> > doesn't break any platform(which it shouldn't anyways).
> > 
> > Just hoping if anyone looks at it and have feedback once it is in -next.
> > I will apply formally at v6.12-rc1 and report back if no one complains
> > until then.
> > 
> 
> Hi Florian,
> 
> Just thought I will check with you if the content is -next are fine as I now
> recall I did the rebase as this patch was original posted before the rework
> of transport as modules were merged. Please confirm if you are happy with the
> rebase as you see in -next. I also had to rebase it on recent fixes that
> Justin added as there were trivial conflicts.
> 
> Another thing I wanted to check is if [1] series has any impact on this.
> IIUC no, but it would be good to give a go in terms of testing just in case
> that as well lands in -next.
> 
> --
> Regards,
> Sudeep
> 
> [1] https://lore.kernel.org/all/20241010123627.695191-1-jvetter@kalrayinc.com

-- 
Regards,
Sudeep