linux-kernel - Re: [PATCH] clk: tegra: fix disable unused for clocks sharing enable bit

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Date:   Mon, 20 Mar 2017 14:15:02 +0100
From:   Thierry Reding <thierry.reding@...il.com>
To:     Peter De Schrijver <pdeschrijver@...dia.com>
Cc:     Prashant Gaikwad <pgaikwad@...dia.com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...eaurora.org>,
        Stephen Warren <swarren@...dotorg.org>,
        Alexandre Courbot <gnurou@...il.com>,
        linux-clk@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] clk: tegra: fix disable unused for clocks sharing enable
 bit

On Thu, Mar 02, 2017 at 03:22:05PM +0200, Peter De Schrijver wrote:
> In case 2 clocks share an enable bit and one of them is enabled by a driver
> and the other one is not, CCF will think it's enabled because it will only
> look at the hw state. Therefor it will disable the clock and thus also
> disable the other clock which was enabled. Solve this by reading the
> initial state of the enable bit and incrementing the refcount if it's set.
> 
> Signed-off-by: Peter De Schrijver <pdeschrijver@...dia.com>
> ---
>  drivers/clk/tegra/clk-periph-gate.c | 3 +++
>  1 file changed, 3 insertions(+)

Applied, thanks.

Thierry

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