From: Mark Brown <broonie@kernel.org>
To: Tudor Ambarus <tudor.ambarus@linaro.org>
Cc: akinobu.mita@gmail.com,
"linux-spi@vger.kernel.org" <linux-spi@vger.kernel.org>,
kernel@martin.sperl.org
Subject: Re: [PATCH 5/6] spi: loopback-test: add elapsed time check
Date: Thu, 18 Jan 2024 12:42:06 +0000 [thread overview]
Message-ID: <a176ecb0-08ed-4e1a-bd0a-aaf70186f5bd@sirena.org.uk> (raw)
In-Reply-To: <f0a9f2af-f737-496e-a1bf-7758826089b9@linaro.org>
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On Thu, Jan 18, 2024 at 08:30:39AM +0000, Tudor Ambarus wrote:
> On 1/12/24 18:37, Mark Brown wrote:
> >> [ 6748.913400] spi-loopback-test spi13.0: elapsed time 532837 ns is
> >> shorter than minimum estimated time 82240000 ns
> > That's a *very* substantial error, it makes me suspect that the hardware
> > might be doing loopback at a stage before it actually clocks the bus and
> > doing something like just connecting the TX and RX FIFOs.
> Thanks, Mark! It was a problem on how the clocks were handled, I ended
> up with a higher frequency than I requested.
Ouch, hopefully that's only affecting loopback mode and not normal
operation for everyone.
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next prev parent reply other threads:[~2024-01-18 12:42 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-03-17 18:17 [PATCH 0/6] spi: loopback-test: add new tests and bug fixes Akinobu Mita
[not found] ` <1489774651-30170-1-git-send-email-akinobu.mita-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2017-03-17 18:17 ` [PATCH 1/6] spi: loopback-test: correct mismatched test description and configuration Akinobu Mita
[not found] ` <1489774651-30170-2-git-send-email-akinobu.mita-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2017-03-17 21:55 ` Applied "spi: loopback-test: correct mismatched test description and configuration" to the spi tree Mark Brown
2017-03-17 18:17 ` [PATCH 2/6] spi: loopback-test: don't skip comparing the first byte of rx_buf Akinobu Mita
[not found] ` <1489774651-30170-3-git-send-email-akinobu.mita-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2017-03-17 21:54 ` Applied "spi: loopback-test: don't skip comparing the first byte of rx_buf" to the spi tree Mark Brown
2017-03-17 18:17 ` [PATCH 3/6] spi: loopback-test: add ability to test zero-length transfer Akinobu Mita
[not found] ` <1489774651-30170-4-git-send-email-akinobu.mita-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2017-03-17 21:54 ` Applied "spi: loopback-test: add ability to test zero-length transfer" to the spi tree Mark Brown
2017-03-17 18:17 ` [PATCH 4/6] spi: loopback-test: test zero-length transfer Akinobu Mita
[not found] ` <1489774651-30170-5-git-send-email-akinobu.mita-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2017-03-17 21:54 ` Applied "spi: loopback-test: test zero-length transfer" to the spi tree Mark Brown
2017-03-17 18:17 ` [PATCH 5/6] spi: loopback-test: add elapsed time check Akinobu Mita
[not found] ` <1489774651-30170-6-git-send-email-akinobu.mita-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2017-03-17 21:54 ` Applied "spi: loopback-test: add elapsed time check" to the spi tree Mark Brown
2024-01-12 16:19 ` [PATCH 5/6] spi: loopback-test: add elapsed time check Tudor Ambarus
2024-01-12 18:37 ` Mark Brown
2024-01-18 8:30 ` Tudor Ambarus
2024-01-18 12:42 ` Mark Brown [this message]
2024-01-18 13:43 ` Tudor Ambarus
2017-03-17 18:17 ` [PATCH 6/6] spi: loopback-test: add test spi_message with delay after transfers Akinobu Mita
[not found] ` <1489774651-30170-7-git-send-email-akinobu.mita-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2017-03-17 21:54 ` Applied "spi: loopback-test: add test spi_message with delay after transfers" to the spi tree Mark Brown
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