From: Henrik Rydberg <rydberg@bitmath.org>
To: Brad Campbell <brad@fnarfbargle.com>
Cc: Arnd Bergmann <arnd@arndb.de>,
linux-hwmon@vger.kernel.org,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
hns@goldelico.com, Guenter Roeck <linux@roeck-us.net>,
Andreas Kemnade <andreas@kemnade.info>,
Jean Delvare <jdelvare@suse.com>
Subject: Re: [PATCH] applesmc: Re-work SMC comms v2
Date: Sun, 8 Nov 2020 09:22:14 +0100 [thread overview]
Message-ID: <bddf0050-4189-4ca4-8077-71683bcc4b10@bitmath.org> (raw)
In-Reply-To: <26d3f4f5-2e9a-cd20-1531-74cf44ef738c@fnarfbargle.com>
Hi Brad,
> G'day Henrik,
>
> Which kernel was this based on? It won't apply to my 5.9 tree.
I was being lazy and applied the diff to linus/master on top of my
current stable branch. More importantly, I sent the mail out from an
email client that may not format the patch properly; I'll fix that.
> I assume the sprinkling of udelay(APPLESMC_MIN_WAIT) means the SMC is
> slow in getting its status register set up. Could we instead just put
> a single one of those up-front in wait_status?
That works fine, just a matter of taste.
> Any chance you could try this one? I've added a retry to send_command and
> added a single global APPLESMC_MIN_WAIT before each status read.
>
> From looking at your modified send_command, it appears the trigger for a
> retry is sending a command and the SMC doing absolutely nothing. This
> should do the same thing.
Not quite, unfortunately. The patch that works waits for a drop of
IB_CLOSED, then checks the BUSY status. If not seen, it resends
immediately, never expecting to see it. The patch in this email creates
a dreadfully sluggish probe, and the occasional failure.
> Interestingly enough, by adding the udelay to wait_status on my machine I've
> gone from 24 reads/s to 50 reads/s.
Yep, I experience the same positive effect.
> I've left out the remainder of the cleanups. Once we get a minimally working
> patch I was going to look at a few cleanups, and I have some patches pending
> to allow writing to the SMC from userspace (for setting BCLM and BFCL mainly)
All fine. I will respond to the v3 mail separately.
Henrik
next prev parent reply other threads:[~2020-11-08 8:22 UTC|newest]
Thread overview: 58+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-30 8:54 [REGRESSION] hwmon: (applesmc) avoid overlong udelay() Andreas Kemnade
2020-09-30 16:44 ` Guenter Roeck
2020-09-30 20:00 ` Arnd Bergmann
2020-10-01 22:22 ` Andreas Kemnade
2020-10-02 4:07 ` Guenter Roeck
2020-10-06 7:02 ` Andreas Kemnade
2020-11-02 23:56 ` Brad Campbell
2020-11-03 5:56 ` Brad Campbell
2020-11-04 13:20 ` Andreas Kemnade
2020-11-05 2:18 ` Brad Campbell
2020-11-05 4:22 ` Brad Campbell
2020-11-05 4:43 ` Guenter Roeck
2020-11-05 5:05 ` Brad Campbell
2020-11-05 5:26 ` Guenter Roeck
2020-11-05 5:47 ` [PATCH] applesmc: Re-work SMC comms v1 Brad Campbell
2020-11-05 7:26 ` [PATCH] applesmc: Re-work SMC comms v2 Brad Campbell
2020-11-05 7:56 ` Henrik Rydberg
2020-11-05 8:15 ` Andreas Kemnade
2020-11-05 8:30 ` Brad Campbell
2020-11-05 10:31 ` Henrik Rydberg
2020-11-06 16:26 ` Henrik Rydberg
2020-11-06 20:02 ` Henrik Rydberg
2020-11-07 18:31 ` Henrik Rydberg
2020-11-08 0:09 ` Brad Campbell
2020-11-08 8:22 ` Henrik Rydberg [this message]
2020-11-08 1:00 ` [PATCH v3] applesmc: Re-work SMC comms Brad Campbell
2020-11-08 8:35 ` Henrik Rydberg
2020-11-08 10:14 ` Henrik Rydberg
2020-11-08 11:57 ` Brad Campbell
2020-11-08 12:04 ` Henrik Rydberg
2020-11-09 13:06 ` Brad Campbell
2020-11-09 17:08 ` Henrik Rydberg
2020-11-09 22:52 ` Brad Campbell
2020-11-08 16:06 ` Guenter Roeck
2020-11-09 0:25 ` Brad Campbell
2020-11-10 2:04 ` Brad Campbell
2020-11-10 4:55 ` Guenter Roeck
2020-11-10 5:40 ` Brad Campbell
2020-11-10 16:02 ` Guenter Roeck
2020-11-09 8:44 ` Andreas Kemnade
2020-11-09 9:51 ` Brad Campbell
2020-11-11 3:37 ` [PATCH v4 0/1] " Brad Campbell
2020-11-11 4:55 ` [PATCH v1] applesmc: Cleanups on top of re-work comms Brad Campbell
2020-11-11 3:38 ` [PATCH v4 1/1] applesmc: Re-work SMC comms Brad Campbell
2020-11-11 5:56 ` Guenter Roeck
2020-11-11 7:05 ` Brad Campbell
2020-11-11 13:06 ` [PATCH v5 " Brad Campbell
2020-11-11 20:05 ` Henrik Rydberg
2020-11-11 23:28 ` Brad Campbell
2020-11-12 3:08 ` [PATCH v6 " Brad Campbell
2020-11-12 17:20 ` Guenter Roeck
2020-11-06 23:11 ` [PATCH] applesmc: Re-work SMC comms v2 Brad Campbell
2020-11-05 8:12 ` Andreas Kemnade
2020-11-05 16:12 ` Guenter Roeck
2020-11-06 0:02 ` Brad Campbell
2020-11-06 3:08 ` Guenter Roeck
2020-11-09 9:27 ` [PATCH] applesmc: Re-work SMC comms v1 kernel test robot
2020-11-05 9:48 ` [REGRESSION] hwmon: (applesmc) avoid overlong udelay() Arnd Bergmann
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