linux-kernel - Re: [PATCH v6 6/9] clk: stm32: Fix ltdc's clock turn off by clk_disable

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Message-ID: <CAL9mu0KBKVufGx96=_5dWokC0uJBW35TnFxEofXA44QhpEK6-g@mail.gmail.com>
Date:   Wed, 10 Mar 2021 19:43:42 +0800
From:   dillon min <dillon.minfei@...il.com>
To:     Stephen Boyd <sboyd@...nel.org>
Cc:     Dave Airlie <airlied@...ux.ie>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Daniel Vetter <daniel@...ll.ch>,
        Linus Walleij <linus.walleij@...aro.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Michael Turquette <mturquette@...libre.com>,
        Noralf Trønnes <noralf@...nnes.org>,
        p.zabel@...gutronix.de, Rob Herring <robh+dt@...nel.org>,
        Sam Ravnborg <sam@...nborg.org>, thierry.reding@...il.com,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-spi <linux-spi@...r.kernel.org>,
        linux-stm32@...md-mailman.stormreply.com,
        "open list:DRM PANEL DRIVERS" <dri-devel@...ts.freedesktop.org>,
        linux-clk <linux-clk@...r.kernel.org>,
        Hua Dillon <dillonhua@...il.com>
Subject: Re: [PATCH v6 6/9] clk: stm32: Fix ltdc's clock turn off by
 clk_disable_unused() after kernel startup

still need more expert to review, so just a gentle ping for this patch

On Wed, May 27, 2020 at 4:35 PM Stephen Boyd <sboyd@...nel.org> wrote:
>
> Quoting dillon.minfei@...il.com (2020-05-27 00:27:30)
> > From: dillon min <dillon.minfei@...il.com>
> >
> > stm32's clk driver register two ltdc gate clk to clk core by
> > clk_hw_register_gate() and clk_hw_register_composite()
> >
> > first: 'stm32f429_gates[]', clk name is 'ltdc', which no user to use.
> > second: 'stm32f429_aux_clk[]', clk name is 'lcd-tft', used by ltdc driver
> >
> > both of them point to the same offset of stm32's RCC register. after
> > kernel enter console, clk core turn off ltdc's clk as 'stm32f429_gates[]'
> > is no one to use. but, actually 'stm32f429_aux_clk[]' is in use.
> >
> > Fixes: daf2d117cbca ("clk: stm32f4: Add lcd-tft clock")
> > Signed-off-by: dillon min <dillon.minfei@...il.com>
> > ---
>
> Acked-by: Stephen Boyd <sboyd@...nel.org>