From: Tom Rini <trini@konsulko.com>
To: u-boot@lists.denx.de
Subject: [PATCH V2] spi: Update speed/mode on change
Date: Sun, 28 Mar 2021 17:30:55 -0400 [thread overview]
Message-ID: <20210328213055.GB1310@bill-the-cat> (raw)
In-Reply-To: <20210226142124.56305-1-marex@denx.de>
On Fri, Feb 26, 2021 at 03:21:24PM +0100, Marek Vasut wrote:
> The spi_get_bus_and_cs() may be called on the same bus and chipselect
> with different frequency or mode. This is valid usecase, but the code
> fails to notify the controller of such a configuration change. Call
> spi_set_speed_mode() in case bus frequency or bus mode changed to let
> the controller update the configuration.
>
> The problem can easily be triggered using the sspi command:
> => sspi 0:0 at 1000
> => sspi 0:0 at 2000
> Without this patch, both transfers happen at 1000 Hz. With this patch,
> the later transfer happens correctly at 2000 Hz.
>
> Signed-off-by: Marek Vasut <marex@denx.de>
> Cc: Jagan Teki <jagan@amarulasolutions.com>
> Cc: Patrick Delaunay <patrick.delaunay@st.com>
So, very reliably I can make:
https://source.denx.de/u-boot/u-boot/-/jobs/245517
happen locally as well building with clang. It's not obvious to me why
the test now fails however.
--
Tom
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next prev parent reply other threads:[~2021-03-28 21:30 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-26 14:21 [PATCH V2] spi: Update speed/mode on change Marek Vasut
2021-03-25 17:41 ` Marek Vasut
2021-03-28 21:30 ` Tom Rini [this message]
2021-03-29 1:32 ` Marek Vasut
2021-03-29 1:59 ` Tom Rini
2021-03-29 2:09 ` Marek Vasut
2021-03-29 2:40 ` Marek Vasut
2021-03-31 19:18 ` Marek Vasut
2021-03-31 19:26 ` Tom Rini
2021-03-31 19:40 ` Tom Rini
2021-03-31 20:05 ` Marek Vasut
2021-03-31 21:45 ` Tom Rini
2021-03-31 22:19 ` Simon Glass
2021-04-01 14:18 ` Tom Rini
2021-03-31 22:39 ` Marek Vasut
2021-03-31 22:50 ` Simon Glass
2021-03-31 23:19 ` Marek Vasut
2021-03-31 23:41 ` Simon Glass
2021-03-31 23:47 ` Marek Vasut
2021-03-31 23:54 ` Tom Rini
-- strict thread matches above, loose matches on Subject: below --
2021-06-10 12:00 Marek Vasut
2021-06-30 16:49 ` Tom Rini
2021-07-02 17:24 ` Da Xue
2021-07-02 17:44 ` Marek Vasut
[not found] ` <CACdvmAh4MZ-rACRAY1nv1d0myCMyNnXjR5htkHTpe3A-wm=B1g@mail.gmail.com>
2021-07-02 18:10 ` Marek Vasut
2021-07-02 18:28 ` Da Xue
2021-07-02 19:06 ` Marek Vasut
2021-07-02 19:35 ` Da Xue
2021-07-02 19:40 ` Marek Vasut
2021-07-02 20:10 ` Da Xue
2021-07-02 20:20 ` Marek Vasut
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