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From: Stephen Boyd <sboyd@kernel.org>
To: Ansuel Smith <ansuelsmth@gmail.com>,
	Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Cc: Rob Herring <robh+dt@kernel.org>,
	Bjorn Andersson <bjorn.andersson@linaro.org>,
	Andy Gross <agross@kernel.org>,
	Michael Turquette <mturquette@baylibre.com>,
	Peter De Schrijver <pdeschrijver@nvidia.com>,
	Prashant Gaikwad <pgaikwad@nvidia.com>,
	Thierry Reding <thierry.reding@gmail.com>,
	Jonathan Hunter <jonathanh@nvidia.com>,
	devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-arm-msm@vger.kernel.org, linux-clk@vger.kernel.org,
	linux-tegra@vger.kernel.org
Subject: Re: [PATCH 12/16] clk: qcom: clk-krait: add 8064 errata workaround
Date: Tue, 15 Mar 2022 14:34:30 -0700	[thread overview]
Message-ID: <20220315213431.DB6C4C340EE@smtp.kernel.org> (raw)
In-Reply-To: <Yi84aNrJ7p+3jy2A@Ansuel-xps.localdomain>

Quoting Ansuel Smith (2022-03-14 05:43:20)
> On Mon, Mar 14, 2022 at 11:20:21AM +0300, Dmitry Baryshkov wrote:
> > On 13/03/2022 22:04, Ansuel Smith wrote:
> > > Add 8064 errata workaround where the sec_src clock gating needs to be
> > 
> > Could you please be more specific whether the errata applies only to the
> > ipq8064 or to the apq8064 too? 8064 is not specific enough.
> >
> 
> That's a good question... Problem is that we really don't know the
> answer. This errata comes from qsdk on an old sourcecode. I assume this
> is specific to ipq8064 and apq8064 have different mux configuration.
> 

I think it was some glitch that happened when the automatic clk gating
was enabled during a switch. The automatic clk gating didn't know that
software was running and switching the input so it killed the CPU and
stopped the clk. That lead to hangs and super badness. I assume it was
applicable to apq8064 as well because ipq8064 is basically apq8064 with
the multimedia subsystem replaced by the networking subsystem. Also I
wouldn't remember all these details because I worked on apq8064 but not
so much on ipq8064 :)

  reply	other threads:[~2022-03-15 21:34 UTC|newest]

Thread overview: 31+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-03-13 19:04 [PATCH 00/16] Modernize rest of the krait drivers Ansuel Smith
2022-03-13 19:04 ` [PATCH 01/16] clk: permit to define a custom parent for clk_hw_get_parent_index Ansuel Smith
2022-03-15 17:55   ` Stephen Boyd
2022-03-15 18:07     ` Ansuel Smith
2022-03-15 21:30       ` Stephen Boyd
2022-03-13 19:04 ` [PATCH 02/16] clk: qcom: gcc-ipq806x: skip pxo/cxo fixed clk if already present Ansuel Smith
2022-03-13 19:04 ` [PATCH 03/16] clk: qcom: gcc-ipq806x: add PXO_SRC in clk table Ansuel Smith
2022-03-13 19:04 ` [PATCH 04/16] clk: qcom: clk-hfpll: use poll_timeout macro Ansuel Smith
2022-03-13 19:04 ` [PATCH 05/16] clk: qcom: kpss-xcc: convert to parent data API Ansuel Smith
2022-03-13 19:04 ` [PATCH 06/16] clk: qcom: clk-krait: unlock spin after mux completion Ansuel Smith
2022-03-13 19:04 ` [PATCH 07/16] clk: qcom: clk-krait: add hw_parent check for div2_round_rate Ansuel Smith
2022-03-15 22:43   ` Stephen Boyd
2022-03-13 19:04 ` [PATCH 08/16] clk: qcom: krait-cc: convert to parent_data API Ansuel Smith
2022-03-13 19:04 ` [PATCH 09/16] clk: qcom: krait-cc: drop pr_info and register qsb only if needed Ansuel Smith
2022-03-15 22:45   ` Stephen Boyd
2022-03-13 19:04 ` [PATCH 10/16] clk: qcom: krait-cc: drop hardcoded safe_sel Ansuel Smith
2022-03-13 19:04 ` [PATCH 11/16] clk: qcom: krait-cc: force sec_mux to QSB Ansuel Smith
2022-03-15 22:47   ` Stephen Boyd
2022-03-13 19:04 ` [PATCH 12/16] clk: qcom: clk-krait: add 8064 errata workaround Ansuel Smith
2022-03-14  8:20   ` Dmitry Baryshkov
2022-03-14 12:43     ` Ansuel Smith
2022-03-15 21:34       ` Stephen Boyd [this message]
2022-03-15 21:47         ` Ansuel Smith
2022-03-15 22:41           ` Stephen Boyd
2022-03-16 15:46             ` Ansuel Smith
2022-03-17 19:34               ` Stephen Boyd
2022-03-13 19:04 ` [PATCH 13/16] clk: qcom: clk-krait: add enable disable ops Ansuel Smith
2022-03-13 19:04 ` [PATCH 14/16] dt-bindings: clock: Convert qcom,krait-cc to yaml Ansuel Smith
2022-03-13 19:04 ` [PATCH 15/16] dts: qcom-ipq8064: add missing krait-cc compatible and clocks Ansuel Smith
2022-03-13 19:04 ` [PATCH 16/16] dt-bindings: arm: msm: Convert kpss driver Documentation to yaml Ansuel Smith
2022-03-14 14:42   ` Rob Herring

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