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From: Stephen Boyd <sboyd@kernel.org>
To: Marek Szyprowski <m.szyprowski@samsung.com>,
	Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Cc: Guenter Roeck <linux@roeck-us.net>,
	mturquette@baylibre.com, linux-clk@vger.kernel.org,
	Neil Armstrong <narmstrong@baylibre.com>,
	jbrunet@baylibre.com, khilman@baylibre.com,
	linux-kernel@vger.kernel.org, linux-amlogic@lists.infradead.org,
	linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v3 2/3] clk: divider: Switch from .round_rate to .determine_rate by default
Date: Fri, 02 Jul 2021 14:00:53 -0700	[thread overview]
Message-ID: <162525965307.3570193.9588997729905273358@swboyd.mtv.corp.google.com> (raw)
In-Reply-To: <e21c34a3-2586-057d-013b-6c8ec094d1a8@samsung.com>

Quoting Marek Szyprowski (2021-07-02 05:46:11)
> Hi
> 
> On 02.07.2021 11:19, Martin Blumenstingl wrote:
> > Hi Stephen,
> >
> > On Fri, Jul 2, 2021 at 3:02 AM Stephen Boyd <sboyd@kernel.org> wrote:
> > [...]
> >> My guess is that we have drivers copying the clk_ops from the
> >> divider_ops structure and so they are copying over round_rate but not
> >> determine_rate.
> > I just learned something new - thanks for investigating this as well!
> >
> > $ git grep "clk_divider_ops\.round_rate" drivers/
> > drivers/clk/bcm/clk-bcm2835.c:  return clk_divider_ops.round_rate(hw,
> > rate, parent_rate);
> 
> I confirm that this issue appears also on Raspberry Pi 3b+ board. I was 
> about to write a bug report, but you were faster. The funny thing is 
> that is so nondeterministic, that automated bisecting failed to catch it.
> 

I'd think it was deterministic. The function pointer is NULL after this
patch so it should always try to set the PC to 0 and fail to execute.
Unless that is somehow executable?

  reply	other threads:[~2021-07-02 21:00 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-27 22:39 [PATCH v3 0/3] clk: meson: rounding for fast clocks on 32-bit SoCs Martin Blumenstingl
2021-06-27 22:39 ` [PATCH v3 1/3] clk: divider: Add re-usable determine_rate implementations Martin Blumenstingl
2021-06-30 18:39   ` Stephen Boyd
2021-06-27 22:39 ` [PATCH v3 2/3] clk: divider: Switch from .round_rate to .determine_rate by default Martin Blumenstingl
2021-06-30 18:39   ` Stephen Boyd
2021-07-01 20:25   ` Guenter Roeck
2021-07-01 20:57     ` Martin Blumenstingl
2021-07-01 21:43       ` Guenter Roeck
2021-07-02  0:53         ` Stephen Boyd
2021-07-02  1:02       ` Stephen Boyd
2021-07-02  9:19         ` Martin Blumenstingl
     [not found]           ` <CGME20210702124612eucas1p1762911deb37e4fb03adc9239bb715135@eucas1p1.samsung.com>
2021-07-02 12:46             ` Marek Szyprowski
2021-07-02 21:00               ` Stephen Boyd [this message]
2021-07-02 20:59           ` Stephen Boyd
2021-07-02 22:57             ` Martin Blumenstingl
2021-07-02  1:04   ` Stephen Boyd
2021-06-27 22:39 ` [PATCH v3 3/3] clk: meson: regmap: switch to determine_rate for the dividers Martin Blumenstingl
2021-06-30 18:39   ` Stephen Boyd

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