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References: <1635232282-3992-1-git-send-email-dillon.minfei@gmail.com> <1635232282-3992-10-git-send-email-dillon.minfei@gmail.com>
In-Reply-To: <1635232282-3992-10-git-send-email-dillon.minfei@gmail.com>
From:   Dillon Min <dillon.minfei@gmail.com>
Date:   Fri, 12 Nov 2021 10:40:09 +0800
Message-ID: <CAL9mu0LVBSorMK9KbZ3kXYcnubi44yPDxzMroKYVYB2c=o+xjQ@mail.gmail.com>
Subject: Re: [PATCH v7 09/10] clk: stm32: Fix ltdc's clock turn off by
 clk_disable_unused() after system enter shell
To:     Stephen Boyd <sboyd@kernel.org>
Cc:     Patrice CHOTARD <patrice.chotard@foss.st.com>,
        Pi-Hsun Shih <pihsun@chromium.org>,
        Maxime Coquelin <mcoquelin.stm32@gmail.com>, gnurou@gmail.com,
        ezequiel@collabora.com, Hans Verkuil <hverkuil-cisco@xs4all.nl>,
        mchehab+huawei@kernel.org,
        Mauro Carvalho Chehab <mchehab@kernel.org>,
        hugues.fruchet@foss.st.com,
        linux-media <linux-media@vger.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        linux-stm32@st-md-mailman.stormreply.com,
        Linux ARM <linux-arm-kernel@lists.infradead.org>,
        linux-clk <linux-clk@vger.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@vger.kernel.org>, kernel test robot <lkp@intel.com>,
        kbuild-all@lists.01.org, llvm@lists.linux.dev,
        Alexandre TORGUE <alexandre.torgue@foss.st.com>
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Hi Stephen

Would you pick up this patch? Thanks.

Best Regards.
Dillon

On Tue, 26 Oct 2021 at 15:12, Dillon Min <dillon.minfei@gmail.com> wrote:
>
> 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@gmail.com>
> Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com>
> Acked-by: Gabriel Fernandez <gabriel.fernandez@foss.st.com>
> Acked-by: Stephen Boyd <sboyd@kernel.org>
> ---
> v7:
> - collect acked-by, reviewed-by from Gabriel, Patrice.
>
>  drivers/clk/clk-stm32f4.c | 4 ----
>  1 file changed, 4 deletions(-)
>
> diff --git a/drivers/clk/clk-stm32f4.c b/drivers/clk/clk-stm32f4.c
> index af46176ad053..473dfe632cc5 100644
> --- a/drivers/clk/clk-stm32f4.c
> +++ b/drivers/clk/clk-stm32f4.c
> @@ -129,7 +129,6 @@ static const struct stm32f4_gate_data stm32f429_gates[] __initconst = {
>         { STM32F4_RCC_APB2ENR, 20,      "spi5",         "apb2_div" },
>         { STM32F4_RCC_APB2ENR, 21,      "spi6",         "apb2_div" },
>         { STM32F4_RCC_APB2ENR, 22,      "sai1",         "apb2_div" },
> -       { STM32F4_RCC_APB2ENR, 26,      "ltdc",         "apb2_div" },
>  };
>
>  static const struct stm32f4_gate_data stm32f469_gates[] __initconst = {
> @@ -211,7 +210,6 @@ static const struct stm32f4_gate_data stm32f469_gates[] __initconst = {
>         { STM32F4_RCC_APB2ENR, 20,      "spi5",         "apb2_div" },
>         { STM32F4_RCC_APB2ENR, 21,      "spi6",         "apb2_div" },
>         { STM32F4_RCC_APB2ENR, 22,      "sai1",         "apb2_div" },
> -       { STM32F4_RCC_APB2ENR, 26,      "ltdc",         "apb2_div" },
>  };
>
>  static const struct stm32f4_gate_data stm32f746_gates[] __initconst = {
> @@ -286,7 +284,6 @@ static const struct stm32f4_gate_data stm32f746_gates[] __initconst = {
>         { STM32F4_RCC_APB2ENR, 21,      "spi6",         "apb2_div" },
>         { STM32F4_RCC_APB2ENR, 22,      "sai1",         "apb2_div" },
>         { STM32F4_RCC_APB2ENR, 23,      "sai2",         "apb2_div" },
> -       { STM32F4_RCC_APB2ENR, 26,      "ltdc",         "apb2_div" },
>  };
>
>  static const struct stm32f4_gate_data stm32f769_gates[] __initconst = {
> @@ -364,7 +361,6 @@ static const struct stm32f4_gate_data stm32f769_gates[] __initconst = {
>         { STM32F4_RCC_APB2ENR, 21,      "spi6",         "apb2_div" },
>         { STM32F4_RCC_APB2ENR, 22,      "sai1",         "apb2_div" },
>         { STM32F4_RCC_APB2ENR, 23,      "sai2",         "apb2_div" },
> -       { STM32F4_RCC_APB2ENR, 26,      "ltdc",         "apb2_div" },
>         { STM32F4_RCC_APB2ENR, 30,      "mdio",         "apb2_div" },
>  };
>
> --
> 2.7.4
>