From: Zev Weiss <zev@bewilderbeest.net>
To: Guenter Roeck <linux@roeck-us.net>
Cc: linux-i2c@vger.kernel.org, Peter Rosin <peda@axentia.se>,
Rob Herring <robh+dt@kernel.org>,
openbmc@lists.ozlabs.org, linux-kernel@vger.kernel.org,
devicetree@vger.kernel.org, Wolfram Sang <wsa@kernel.org>
Subject: Re: [PATCH v2 0/2] ic2: mux: pca9541: add delayed-release support
Date: Mon, 28 Feb 2022 09:11:47 -0800 [thread overview]
Message-ID: <Yh0CUzBzGJc4zyTR@hatter.bewilderbeest.net> (raw)
In-Reply-To: <fbb305e3-73b3-7a2d-99cf-a7205b7344ff@roeck-us.net>
On Mon, Feb 28, 2022 at 05:57:27AM PST, Guenter Roeck wrote:
>On 2/28/22 00:43, Zev Weiss wrote:
>>On Mon, Jan 31, 2022 at 04:18:08PM PST, Zev Weiss wrote:
>>>Hello,
>>>
>>>This series adds support for a new pca9541 device-tree property
>>>("release-delay-us"), which delays releasing ownership of the bus
>>>after a transaction for a configurable duration, anticipating that
>>>another transaction may follow shortly. By avoiding a
>>>release/reacquisition between transactions, this can provide a
>>>substantial performance improvement for back-to-back operations -- on
>>>a Delta AHE-50DC (ASPEED AST1250) system running OpenBMC with dozens
>>>of LM25066 PMICs on PCA9541-arbitrated busses, a setting of 10000 (10
>>>ms) reduces the median latency the psusensor daemon's hwmon sysfs file
>>>reads from 2.28 ms to 0.99 ms (a 57% improvement).
>>>
>>
>>Ping...Guenter, any thoughts on this?
>>
>
>It sounds reasonable to me, but I don't have access to hardware anymore
>to test it, so I have no means to confirm that it actually works.
>
Ack, thanks. In that case, what's the path forward on getting changes
to this driver merged? I see sign-offs from Wolfram and Peter on the
last few commits that touched it -- any input from the i2c/i2c-mux
maintainers?
Zev
WARNING: multiple messages have this Message-ID (diff)
From: Zev Weiss <zev@bewilderbeest.net>
To: Guenter Roeck <linux@roeck-us.net>
Cc: devicetree@vger.kernel.org, openbmc@lists.ozlabs.org,
linux-kernel@vger.kernel.org, Wolfram Sang <wsa@kernel.org>,
Rob Herring <robh+dt@kernel.org>,
linux-i2c@vger.kernel.org, Peter Rosin <peda@axentia.se>
Subject: Re: [PATCH v2 0/2] ic2: mux: pca9541: add delayed-release support
Date: Mon, 28 Feb 2022 09:11:47 -0800 [thread overview]
Message-ID: <Yh0CUzBzGJc4zyTR@hatter.bewilderbeest.net> (raw)
In-Reply-To: <fbb305e3-73b3-7a2d-99cf-a7205b7344ff@roeck-us.net>
On Mon, Feb 28, 2022 at 05:57:27AM PST, Guenter Roeck wrote:
>On 2/28/22 00:43, Zev Weiss wrote:
>>On Mon, Jan 31, 2022 at 04:18:08PM PST, Zev Weiss wrote:
>>>Hello,
>>>
>>>This series adds support for a new pca9541 device-tree property
>>>("release-delay-us"), which delays releasing ownership of the bus
>>>after a transaction for a configurable duration, anticipating that
>>>another transaction may follow shortly. By avoiding a
>>>release/reacquisition between transactions, this can provide a
>>>substantial performance improvement for back-to-back operations -- on
>>>a Delta AHE-50DC (ASPEED AST1250) system running OpenBMC with dozens
>>>of LM25066 PMICs on PCA9541-arbitrated busses, a setting of 10000 (10
>>>ms) reduces the median latency the psusensor daemon's hwmon sysfs file
>>>reads from 2.28 ms to 0.99 ms (a 57% improvement).
>>>
>>
>>Ping...Guenter, any thoughts on this?
>>
>
>It sounds reasonable to me, but I don't have access to hardware anymore
>to test it, so I have no means to confirm that it actually works.
>
Ack, thanks. In that case, what's the path forward on getting changes
to this driver merged? I see sign-offs from Wolfram and Peter on the
last few commits that touched it -- any input from the i2c/i2c-mux
maintainers?
Zev
next prev parent reply other threads:[~2022-02-28 17:11 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-02-01 0:18 [PATCH v2 0/2] ic2: mux: pca9541: add delayed-release support Zev Weiss
2022-02-01 0:18 ` Zev Weiss
2022-02-01 0:18 ` [PATCH v2 1/2] i2c: " Zev Weiss
2022-02-01 0:18 ` Zev Weiss
2022-02-01 0:18 ` [PATCH v2 2/2] dt-bindings: i2c: add nxp,pca9541 release-delay-us property Zev Weiss
2022-02-01 0:18 ` [PATCH v2 2/2] dt-bindings: i2c: add nxp, pca9541 " Zev Weiss
2022-02-09 21:47 ` [PATCH v2 2/2] dt-bindings: i2c: add nxp,pca9541 " Rob Herring
2022-02-09 21:47 ` Rob Herring
2022-02-28 8:43 ` [PATCH v2 0/2] ic2: mux: pca9541: add delayed-release support Zev Weiss
2022-02-28 8:43 ` Zev Weiss
2022-02-28 13:57 ` Guenter Roeck
2022-02-28 13:57 ` Guenter Roeck
2022-02-28 17:11 ` Zev Weiss [this message]
2022-02-28 17:11 ` Zev Weiss
2022-02-28 17:19 ` Wolfram Sang
2022-02-28 17:19 ` Wolfram Sang
2022-02-28 18:10 ` Guenter Roeck
2022-02-28 18:10 ` Guenter Roeck
2022-02-28 21:54 ` Peter Rosin
2022-02-28 21:54 ` Peter Rosin
2022-02-28 22:38 ` Zev Weiss
2022-02-28 22:38 ` Zev Weiss
2022-03-02 14:43 ` Peter Rosin
2022-03-02 14:43 ` Peter Rosin
2022-03-03 0:43 ` Zev Weiss
2022-03-03 0:43 ` Zev Weiss
2022-03-18 11:00 ` Wolfram Sang
2022-03-18 11:00 ` Wolfram Sang
2022-03-21 22:32 ` Zev Weiss
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