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

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Message-ID: <159056850835.88029.9264848839121822798@swboyd.mtv.corp.google.com>
Date:   Wed, 27 May 2020 01:35:08 -0700
From:   Stephen Boyd <sboyd@...nel.org>
To:     airlied@...ux.ie, alexandre.torgue@...com,
        andy.shevchenko@...il.com, broonie@...nel.org, daniel@...ll.ch,
        dillon.minfei@...il.com, linus.walleij@...aro.org,
        mcoquelin.stm32@...il.com, mturquette@...libre.com,
        noralf@...nnes.org, p.zabel@...gutronix.de, robh+dt@...nel.org,
        sam@...nborg.org, thierry.reding@...il.com
Cc:     devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-spi@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        dri-devel@...ts.freedesktop.org, linux-clk@...r.kernel.org,
        dillonhua@...il.com, dillon min <dillon.minfei@...il.com>
Subject: Re: [PATCH v6 6/9] clk: stm32: Fix ltdc's clock turn off by clk_disable_unused() after kernel startup

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>