linux-kernel - Re: [PATCH v7 09/10] clk: stm32: Fix ltdc's clock turn off by clk_disable

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Message-Id: <20211216064556.50385C36AE2@smtp.kernel.org>
Date:   Wed, 15 Dec 2021 22:45:55 -0800
From:   Stephen Boyd <sboyd@...nel.org>
To:     Dillon Min <dillon.minfei@...il.com>, alexandre.torgue@...s.st.com,
        ezequiel@...labora.com, gabriel.fernandez@...s.st.com,
        gabriel.fernandez@...com, gnurou@...il.com,
        hverkuil-cisco@...all.nl, mchehab+huawei@...nel.org,
        mchehab@...nel.org, mcoquelin.stm32@...il.com,
        mturquette@...libre.com, pihsun@...omium.org, robh+dt@...nel.org
Cc:     patrice.chotard@...s.st.com, hugues.fruchet@...s.st.com,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-clk@...r.kernel.org,
        devicetree@...r.kernel.org, lkp@...el.com, kbuild-all@...ts.01.org,
        llvm@...ts.linux.dev
Subject: Re: [PATCH v7 09/10] clk: stm32: Fix ltdc's clock turn off by clk_disable_unused() after system enter shell

Quoting Dillon Min (2021-10-26 00:11:21)
> 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.
> 
> stm32f469/746/769 have the same issue, fix it.
> 
> Fixes: daf2d117cbca ("clk: stm32f4: Add lcd-tft clock")
> Link: https://lore.kernel.org/linux-arm-kernel/1590564453-24499-7-git-send-email-dillon.minfei@gmail.com/
> Link: https://lore.kernel.org/lkml/CAPTRvHkf0cK_4ZidM17rPo99gWDmxgqFt4CDUjqFFwkOeQeFDg@mail.gmail.com/
> Signed-off-by: Dillon Min <dillon.minfei@...il.com>
> Reviewed-by: Patrice Chotard <patrice.chotard@...s.st.com>
> Acked-by: Gabriel Fernandez <gabriel.fernandez@...s.st.com>
> Acked-by: Stephen Boyd <sboyd@...nel.org>
> ---

Applied to clk-next