From: Wolfram Sang <wsa@kernel.org>
To: Ulrich Hecht <uli+renesas@fpond.eu>
Cc: linux-renesas-soc@vger.kernel.org, linux-mmc@vger.kernel.org,
ulf.hansson@linaro.org
Subject: Re: [PATCH] mmc: renesas_sdhi: increase suspend/resume latency limit
Date: Wed, 19 May 2021 16:25:57 +0200 [thread overview]
Message-ID: <YKUf9TVcKetApd1J@ninjato> (raw)
In-Reply-To: <20210514155318.16812-1-uli+renesas@fpond.eu>
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Hi Uli,
On Fri, May 14, 2021 at 05:53:18PM +0200, Ulrich Hecht wrote:
> The TMIO core sets a very low latency limit (100 us), but when using R-Car
> SDHI hosts with SD cards, I have observed typical latencies of around 20-30
> ms. This prevents runtime PM from working properly, and the devices remain
> on continuously.
>
> This patch sets the default latency limit to 100 ms to avoid that.
>
> Signed-off-by: Ulrich Hecht <uli+renesas@fpond.eu>
Well, yes, I can confirm that this helps wrt the "always-enabled" clock.
However, when removing UHS cards, I now see this regression:
[ 8.659916] mmcblk2: mmc2:0001 00000 29.8 GiB
[ 8.677304] mmcblk2: p1
[ 9.622918] mmc2: tuning execution failed: -5
[ 9.627385] mmc2: card 0001 removed
It is interesting to see the "execution failed" error when *removing*
the card. Before removing, access to the card seems fine. I haven't
checked further, so I can't say yet if this is a related or seperate but
now undiscovered issue.
Thanks for the work so far!
Wolfram
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next prev parent reply other threads:[~2021-05-19 14:26 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-14 15:53 [PATCH] mmc: renesas_sdhi: increase suspend/resume latency limit Ulrich Hecht
2021-05-19 14:25 ` Wolfram Sang [this message]
2021-06-02 15:40 ` Ulrich Hecht
2021-06-18 8:17 ` Wolfram Sang
2021-06-18 10:40 ` Wolfram Sang
2021-06-30 4:44 ` Wolfram Sang
2021-07-30 15:28 ` Wolfram Sang
2021-08-02 5:34 ` Yoshihiro Shimoda
2021-08-02 11:18 ` Ulrich Hecht
2021-08-03 11:16 ` Yoshihiro Shimoda
2021-08-04 5:29 ` Yoshihiro Shimoda
2021-08-04 16:17 ` Ulrich Hecht
2021-08-02 12:53 ` Wolfram Sang
2021-08-03 11:16 ` Yoshihiro Shimoda
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