[v6,09/10] clk: stm32: Fix ltdc's clock turn off by clk_disable_unused() after system enter shell
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From: Dillon Min <dillon.minfei@gmail.com>
To: mchehab@kernel.org, mchehab+huawei@kernel.org,
hverkuil-cisco@xs4all.nl, ezequiel@collabora.com, gnurou@gmail.com,
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Subject: [PATCH v6 09/10] clk: stm32: Fix ltdc's clock turn off by
clk_disable_unused() after system enter shell
Date: Tue, 19 Oct 2021 16:43:22 +0800
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| Series |
Add support for DMA2D of STMicroelectronics STM32 Soc series
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Commit Message
Dillon Min
Oct. 19, 2021, 8:43 a.m. UTC
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>
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>
---
v6: no change.
drivers/clk/clk-stm32f4.c | 4 ----
1 file changed, 4 deletions(-)
Comments
Hi Gabriel I guess you are the maintainer of stm32 clk subsystem from [1], Could you help to review this patch, just give a brief of the history: - this patch was acked by Stephen Boyd at [2]. - reviewed by Patrice Chotard at [3]. Without this patch , the kernel will turn off ltdc's clk after the system reach shell. [1] https://lore.kernel.org/lkml/AM8PR10MB4785545DC980090C1E7D66B281009@AM8PR10MB4785.EURPRD10.PROD.OUTLOOK.COM/ [2] https://lore.kernel.org/linux-arm-kernel/159056850835.88029.9264848839121822798@swboyd.mtv.corp.google.com/ [3] https://lore.kernel.org/lkml/6915fa2a-e211-476f-8317-6825e280c322@foss.st.com/#t Best Regards Dillon On Tue, 19 Oct 2021 at 16:44, 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") > Acked-by: Stephen Boyd <sboyd@kernel.org> > 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> > --- > v6: 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" }, > }; > > -- > 2.7.4 >
Hi Dillon, You can add my Acked-by: Gabriel Fernandez <gabriel.fernandez@foss.st.com> Best Regards Gabriel On 10/22/21 9:25 AM, Dillon Min wrote: > Hi Gabriel > > I guess you are the maintainer of stm32 clk subsystem from [1], Could > you help to review this patch, just give a brief of the history: > > - this patch was acked by Stephen Boyd at [2]. > - reviewed by Patrice Chotard at [3]. > > Without this patch , the kernel will turn off ltdc's clk after the > system reach shell. > > [1] https://lore.kernel.org/lkml/AM8PR10MB4785545DC980090C1E7D66B281009@AM8PR10MB4785.EURPRD10.PROD.OUTLOOK.COM/ > > [2] https://lore.kernel.org/linux-arm-kernel/159056850835.88029.9264848839121822798@swboyd.mtv.corp.google.com/ > > [3] https://lore.kernel.org/lkml/6915fa2a-e211-476f-8317-6825e280c322@foss.st.com/#t > > Best Regards > Dillon > > On Tue, 19 Oct 2021 at 16:44, 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") >> Acked-by: Stephen Boyd <sboyd@kernel.org> >> 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> >> --- >> v6: 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" }, >> }; >> >> -- >> 2.7.4 >>
Hi Gabriel Thanks for the quick response. Best Regards Dillon On Fri, 22 Oct 2021 at 17:10, gabriel.fernandez@foss.st.com <gabriel.fernandez@foss.st.com> wrote: > > Hi Dillon, > > You can add my Acked-by: Gabriel Fernandez <gabriel.fernandez@foss.st.com> > > Best Regards > Gabriel > > On 10/22/21 9:25 AM, Dillon Min wrote: > > Hi Gabriel > > > > I guess you are the maintainer of stm32 clk subsystem from [1], Could > > you help to review this patch, just give a brief of the history: > > > > - this patch was acked by Stephen Boyd at [2]. > > - reviewed by Patrice Chotard at [3]. > > > > Without this patch , the kernel will turn off ltdc's clk after the > > system reach shell. > > > > [1] https://lore.kernel.org/lkml/AM8PR10MB4785545DC980090C1E7D66B281009@AM8PR10MB4785.EURPRD10.PROD.OUTLOOK.COM/ > > > > [2] https://lore.kernel.org/linux-arm-kernel/159056850835.88029.9264848839121822798@swboyd.mtv.corp.google.com/ > > > > [3] https://lore.kernel.org/lkml/6915fa2a-e211-476f-8317-6825e280c322@foss.st.com/#t > > > > Best Regards > > Dillon > > > > On Tue, 19 Oct 2021 at 16:44, 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") > >> Acked-by: Stephen Boyd <sboyd@kernel.org> > >> 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> > >> --- > >> v6: 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" }, > >> }; > >> > >> -- > >> 2.7.4 > >>
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" }, };