Re: [PATCH v5 09/10] clk: stm32: Fix ltdc's clock turn off by clk_disable_unused() after system enter shell

[Dillon Min <dillon.minfei@gmail.com>]

Hi Hans

On Mon, 18 Oct 2021 at 17:37, Hans Verkuil <hverkuil-cisco@xs4all.nl> wrote:
>
> Hi Dillon,
>
> On 18/10/2021 07:04, dillon.minfei@gmail.com wrote:
> > From: Dillon Min <dillon.minfei@gmail.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.
> >
> > stm32f469/746/769 have the same issue, fix it.
> >
> > Fixes: daf2d117cbca ("clk: stm32f4: Add lcd-tft clock")
> > Acked-by: Stephen Boyd <sboyd@kernel.org>
>
> Just to double check (I asked as well when v1 was posted, but that's a long time ago):
> I can ignore this patch, right? If so, then make sure you follow up on this in the clk
> subsystem since it is not yet merged in mainline.
>
> If you DO want me to pick it up, then I see that the clk maintainer has already Acked
> it, so I take it as well.

Appreciate, please help to pick it up.

Thanks & Regards
Dillon

>
> Regards,
>
>         Hans
>
> > 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>
> > ---
> > v5: no change.
> >
> >  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" },
> >  };
> >
> >
>