[PATCH RESEND2 v4 0/2] Use devm helpers for regulator get and enable

[PATCH RESEND2 v4 0/2] Use devm helpers for regulator get and enable

[Matti Vaittinen]

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Simplify couple of drivers by using the new devm_regulator_*get_enable*()

These patches were previously part of the series:
https://lore.kernel.org/lkml/cover.1660934107.git.mazziesaccount@gmail.com/
"Devm helpers for regulator get and enable". I did keep the patch series
versioning even though I changed the series name (subject of this mail)
to "Use devm helpers for regulator get and enable". Name was changed
because the devm helpers are already in 6.1-rc1.

Also, most of the patches in the series are already merged to subsystem
trees so this series now contains only the patches that have not yet
been merged. I hope they can be now directly taken sirectly into
respective subsystem trees as the dependencies should be in v6.1-rc1.

Please note that these changes are only compile-tested as I don't have
the HW to do proper testing. Thus, reviewing / testing is highly
appreciated.

Revision history:

v4: RESEND2:
	- resend code unchanged. Commit titles and and commit messages
	  improved.

v4: RESEND:
	- resend only the drm patches - others have been applied

v3 => v4:
	- Drop applied patches
	- rewrite cover-letter
	- rebase on v6.1-rc1
	- split meson and sii902x into own patches as requested.
	- slightly modify dev_err_probe() return in sii902x.

---


Matti Vaittinen (2):
  drm/bridge: sii902x: Use devm_regulator_bulk_get_enable()
  drm/meson: dw-hdmi: Use devm_regulator_*get_enable*()

 drivers/gpu/drm/bridge/sii902x.c      | 26 ++++----------------------
 drivers/gpu/drm/meson/meson_dw_hdmi.c | 23 +++--------------------
 2 files changed, 7 insertions(+), 42 deletions(-)


base-commit: 094226ad94f471a9f19e8f8e7140a09c2625abaa
-- 
2.38.1


-- 
Matti Vaittinen, Linux device drivers
ROHM Semiconductors, Finland SWDC
Kiviharjunlenkki 1E
90220 OULU
FINLAND

~~~ "I don't think so," said Rene Descartes. Just then he vanished ~~~
Simon says - in Latin please.
~~~ "non cogito me" dixit Rene Descarte, deinde evanescavit ~~~
Thanks to Simon Glass for the translation =] 

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[PATCH RESEND2 v4 2/2] drm/meson: dw-hdmi: Use devm_regulator_*get_enable*()

[Matti Vaittinen]

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Simplify using the devm_regulator_get_enable_optional(). Also drop the
now unused struct member 'hdmi_supply'.

Signed-off-by: Matti Vaittinen <mazziesaccount@gmail.com>
Martin Blumenstingl <martin.blumenstingl@googlemail.com>

---
v4 resend 2:
Respinning unchanged code with the commit title changed as wa suggested
by Robert Foss and commit message changed as was suggested by Martin.

I am doing a clean-up for my local git and encountered this one.
Respinning as it seems this one fell through the cracks.
---
 drivers/gpu/drm/meson/meson_dw_hdmi.c | 23 +++--------------------
 1 file changed, 3 insertions(+), 20 deletions(-)

diff --git a/drivers/gpu/drm/meson/meson_dw_hdmi.c b/drivers/gpu/drm/meson/meson_dw_hdmi.c
index 5cd2b2ebbbd3..7642f740272b 100644
--- a/drivers/gpu/drm/meson/meson_dw_hdmi.c
+++ b/drivers/gpu/drm/meson/meson_dw_hdmi.c
@@ -140,7 +140,6 @@ struct meson_dw_hdmi {
 	struct reset_control *hdmitx_apb;
 	struct reset_control *hdmitx_ctrl;
 	struct reset_control *hdmitx_phy;
-	struct regulator *hdmi_supply;
 	u32 irq_stat;
 	struct dw_hdmi *hdmi;
 	struct drm_bridge *bridge;
@@ -665,11 +664,6 @@ static void meson_dw_hdmi_init(struct meson_dw_hdmi *meson_dw_hdmi)
 
 }
 
-static void meson_disable_regulator(void *data)
-{
-	regulator_disable(data);
-}
-
 static void meson_disable_clk(void *data)
 {
 	clk_disable_unprepare(data);
@@ -723,20 +717,9 @@ static int meson_dw_hdmi_bind(struct device *dev, struct device *master,
 	meson_dw_hdmi->data = match;
 	dw_plat_data = &meson_dw_hdmi->dw_plat_data;
 
-	meson_dw_hdmi->hdmi_supply = devm_regulator_get_optional(dev, "hdmi");
-	if (IS_ERR(meson_dw_hdmi->hdmi_supply)) {
-		if (PTR_ERR(meson_dw_hdmi->hdmi_supply) == -EPROBE_DEFER)
-			return -EPROBE_DEFER;
-		meson_dw_hdmi->hdmi_supply = NULL;
-	} else {
-		ret = regulator_enable(meson_dw_hdmi->hdmi_supply);
-		if (ret)
-			return ret;
-		ret = devm_add_action_or_reset(dev, meson_disable_regulator,
-					       meson_dw_hdmi->hdmi_supply);
-		if (ret)
-			return ret;
-	}
+	ret = devm_regulator_get_enable_optional(dev, "hdmi");
+	if (ret != -ENODEV)
+		return ret;
 
 	meson_dw_hdmi->hdmitx_apb = devm_reset_control_get_exclusive(dev,
 						"hdmitx_apb");
-- 
2.38.1


-- 
Matti Vaittinen, Linux device drivers
ROHM Semiconductors, Finland SWDC
Kiviharjunlenkki 1E
90220 OULU
FINLAND

~~~ "I don't think so," said Rene Descartes. Just then he vanished ~~~
Simon says - in Latin please.
~~~ "non cogito me" dixit Rene Descarte, deinde evanescavit ~~~
Thanks to Simon Glass for the translation =] 

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Re: [PATCH RESEND2 v4 2/2] drm/meson: dw-hdmi: Use devm_regulator_*get_enable*()

[Neil Armstrong]

On 30/11/2022 10:23, Matti Vaittinen wrote:
> Simplify using the devm_regulator_get_enable_optional(). Also drop the
> now unused struct member 'hdmi_supply'.
> 
> Signed-off-by: Matti Vaittinen <mazziesaccount@gmail.com>
> Martin Blumenstingl <martin.blumenstingl@googlemail.com>

Missing Acked-by, I'll add it while applying.

Neil

> 
> ---
> v4 resend 2:
> Respinning unchanged code with the commit title changed as wa suggested
> by Robert Foss and commit message changed as was suggested by Martin.
> 
> I am doing a clean-up for my local git and encountered this one.
> Respinning as it seems this one fell through the cracks.
> ---
>   drivers/gpu/drm/meson/meson_dw_hdmi.c | 23 +++--------------------
>   1 file changed, 3 insertions(+), 20 deletions(-)
> 
> diff --git a/drivers/gpu/drm/meson/meson_dw_hdmi.c b/drivers/gpu/drm/meson/meson_dw_hdmi.c
> index 5cd2b2ebbbd3..7642f740272b 100644
> --- a/drivers/gpu/drm/meson/meson_dw_hdmi.c
> +++ b/drivers/gpu/drm/meson/meson_dw_hdmi.c
> @@ -140,7 +140,6 @@ struct meson_dw_hdmi {
>   	struct reset_control *hdmitx_apb;
>   	struct reset_control *hdmitx_ctrl;
>   	struct reset_control *hdmitx_phy;
> -	struct regulator *hdmi_supply;
>   	u32 irq_stat;
>   	struct dw_hdmi *hdmi;
>   	struct drm_bridge *bridge;
> @@ -665,11 +664,6 @@ static void meson_dw_hdmi_init(struct meson_dw_hdmi *meson_dw_hdmi)
>   
>   }
>   
> -static void meson_disable_regulator(void *data)
> -{
> -	regulator_disable(data);
> -}
> -
>   static void meson_disable_clk(void *data)
>   {
>   	clk_disable_unprepare(data);
> @@ -723,20 +717,9 @@ static int meson_dw_hdmi_bind(struct device *dev, struct device *master,
>   	meson_dw_hdmi->data = match;
>   	dw_plat_data = &meson_dw_hdmi->dw_plat_data;
>   
> -	meson_dw_hdmi->hdmi_supply = devm_regulator_get_optional(dev, "hdmi");
> -	if (IS_ERR(meson_dw_hdmi->hdmi_supply)) {
> -		if (PTR_ERR(meson_dw_hdmi->hdmi_supply) == -EPROBE_DEFER)
> -			return -EPROBE_DEFER;
> -		meson_dw_hdmi->hdmi_supply = NULL;
> -	} else {
> -		ret = regulator_enable(meson_dw_hdmi->hdmi_supply);
> -		if (ret)
> -			return ret;
> -		ret = devm_add_action_or_reset(dev, meson_disable_regulator,
> -					       meson_dw_hdmi->hdmi_supply);
> -		if (ret)
> -			return ret;
> -	}
> +	ret = devm_regulator_get_enable_optional(dev, "hdmi");
> +	if (ret != -ENODEV)
> +		return ret;
>   
>   	meson_dw_hdmi->hdmitx_apb = devm_reset_control_get_exclusive(dev,
>   						"hdmitx_apb");


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Re: [PATCH RESEND2 v4 0/2] Use devm helpers for regulator get and enable

[Neil Armstrong]

Hi,

On Wed, 30 Nov 2022 11:21:51 +0200, Matti Vaittinen wrote:
> Simplify couple of drivers by using the new devm_regulator_*get_enable*()
> 
> These patches were previously part of the series:
> https://lore.kernel.org/lkml/cover.1660934107.git.mazziesaccount@gmail.com/
> "Devm helpers for regulator get and enable". I did keep the patch series
> versioning even though I changed the series name (subject of this mail)
> to "Use devm helpers for regulator get and enable". Name was changed
> because the devm helpers are already in 6.1-rc1.
> 
> [...]

Thanks, Applied to https://anongit.freedesktop.org/git/drm/drm-misc.git (drm-misc-next)

[1/2] drm/bridge: sii902x: Use devm_regulator_bulk_get_enable()
      https://cgit.freedesktop.org/drm/drm-misc/commit/?id=ff1eae1201a46f997126297d2d3440baa2d1b9a9
[2/2] drm/meson: dw-hdmi: Use devm_regulator_*get_enable*()
      https://cgit.freedesktop.org/drm/drm-misc/commit/?id=429e8706366166494314a46c82a9a9929aedbb8c

-- 
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Re: [PATCH RESEND2 v4 2/2] drm/meson: dw-hdmi: Use devm_regulator_*get_enable*()

[Matti Vaittinen]

On 12/1/22 10:38, Neil Armstrong wrote:
> On 30/11/2022 10:23, Matti Vaittinen wrote:
>> Simplify using the devm_regulator_get_enable_optional(). Also drop the
>> now unused struct member 'hdmi_supply'.
>>
>> Signed-off-by: Matti Vaittinen <mazziesaccount@gmail.com>
>> Martin Blumenstingl <martin.blumenstingl@googlemail.com>
> 
> Missing Acked-by, I'll add it while applying.

Oh, well spotted. I should've been more careful.. Sorry and thanks for 
sorting it out!

--Matti

-- 
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Linux kernel developer at ROHM Semiconductors
Oulu Finland

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Re: [RESEND2,v4,2/2] drm/meson: dw-hdmi: Use devm_regulator_*get_enable*()

[Marek Szyprowski]

Hi Matti,

On 30.11.2022 10:23, Matti Vaittinen wrote:
> Simplify using the devm_regulator_get_enable_optional(). Also drop the
> now unused struct member 'hdmi_supply'.
>
> Signed-off-by: Matti Vaittinen <mazziesaccount@gmail.com>
> Martin Blumenstingl <martin.blumenstingl@googlemail.com>
> ---
> v4 resend 2:
> Respinning unchanged code with the commit title changed as wa suggested
> by Robert Foss and commit message changed as was suggested by Martin.
>
> I am doing a clean-up for my local git and encountered this one.
> Respinning as it seems this one fell through the cracks.
> ---
>   drivers/gpu/drm/meson/meson_dw_hdmi.c | 23 +++--------------------
>   1 file changed, 3 insertions(+), 20 deletions(-)
>
> diff --git a/drivers/gpu/drm/meson/meson_dw_hdmi.c b/drivers/gpu/drm/meson/meson_dw_hdmi.c
> index 5cd2b2ebbbd3..7642f740272b 100644
> --- a/drivers/gpu/drm/meson/meson_dw_hdmi.c
> +++ b/drivers/gpu/drm/meson/meson_dw_hdmi.c
> @@ -140,7 +140,6 @@ struct meson_dw_hdmi {
>   	struct reset_control *hdmitx_apb;
>   	struct reset_control *hdmitx_ctrl;
>   	struct reset_control *hdmitx_phy;
> -	struct regulator *hdmi_supply;
>   	u32 irq_stat;
>   	struct dw_hdmi *hdmi;
>   	struct drm_bridge *bridge;
> @@ -665,11 +664,6 @@ static void meson_dw_hdmi_init(struct meson_dw_hdmi *meson_dw_hdmi)
>   
>   }
>   
> -static void meson_disable_regulator(void *data)
> -{
> -	regulator_disable(data);
> -}
> -
>   static void meson_disable_clk(void *data)
>   {
>   	clk_disable_unprepare(data);
> @@ -723,20 +717,9 @@ static int meson_dw_hdmi_bind(struct device *dev, struct device *master,
>   	meson_dw_hdmi->data = match;
>   	dw_plat_data = &meson_dw_hdmi->dw_plat_data;
>   
> -	meson_dw_hdmi->hdmi_supply = devm_regulator_get_optional(dev, "hdmi");
> -	if (IS_ERR(meson_dw_hdmi->hdmi_supply)) {
> -		if (PTR_ERR(meson_dw_hdmi->hdmi_supply) == -EPROBE_DEFER)
> -			return -EPROBE_DEFER;
> -		meson_dw_hdmi->hdmi_supply = NULL;
> -	} else {
> -		ret = regulator_enable(meson_dw_hdmi->hdmi_supply);
> -		if (ret)
> -			return ret;
> -		ret = devm_add_action_or_reset(dev, meson_disable_regulator,
> -					       meson_dw_hdmi->hdmi_supply);
> -		if (ret)
> -			return ret;
> -	}
> +	ret = devm_regulator_get_enable_optional(dev, "hdmi");
> +	if (ret != -ENODEV)

The above line should be "if (ret < 0)", otherwise it breaks hdmi support.

I've noticed this once this change has been merged to linux-next and all 
my Amlogic Meson based boards failed to initialize HDMI. Is it possible 
to fix this in drm tree or do I need to send the incremental fixup?

> +		return ret;
>   
>   	meson_dw_hdmi->hdmitx_apb = devm_reset_control_get_exclusive(dev,
>   						"hdmitx_apb");

Best regards
-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland


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Re: [RESEND2,v4,2/2] drm/meson: dw-hdmi: Use devm_regulator_*get_enable*()

[Neil Armstrong]

On 09/01/2023 14:46, Marek Szyprowski wrote:
> Hi Matti,
> 
> On 30.11.2022 10:23, Matti Vaittinen wrote:
>> Simplify using the devm_regulator_get_enable_optional(). Also drop the
>> now unused struct member 'hdmi_supply'.
>>
>> Signed-off-by: Matti Vaittinen <mazziesaccount@gmail.com>
>> Martin Blumenstingl <martin.blumenstingl@googlemail.com>
>> ---
>> v4 resend 2:
>> Respinning unchanged code with the commit title changed as wa suggested
>> by Robert Foss and commit message changed as was suggested by Martin.
>>
>> I am doing a clean-up for my local git and encountered this one.
>> Respinning as it seems this one fell through the cracks.
>> ---
>>    drivers/gpu/drm/meson/meson_dw_hdmi.c | 23 +++--------------------
>>    1 file changed, 3 insertions(+), 20 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/meson/meson_dw_hdmi.c b/drivers/gpu/drm/meson/meson_dw_hdmi.c
>> index 5cd2b2ebbbd3..7642f740272b 100644
>> --- a/drivers/gpu/drm/meson/meson_dw_hdmi.c
>> +++ b/drivers/gpu/drm/meson/meson_dw_hdmi.c
>> @@ -140,7 +140,6 @@ struct meson_dw_hdmi {
>>    	struct reset_control *hdmitx_apb;
>>    	struct reset_control *hdmitx_ctrl;
>>    	struct reset_control *hdmitx_phy;
>> -	struct regulator *hdmi_supply;
>>    	u32 irq_stat;
>>    	struct dw_hdmi *hdmi;
>>    	struct drm_bridge *bridge;
>> @@ -665,11 +664,6 @@ static void meson_dw_hdmi_init(struct meson_dw_hdmi *meson_dw_hdmi)
>>    
>>    }
>>    
>> -static void meson_disable_regulator(void *data)
>> -{
>> -	regulator_disable(data);
>> -}
>> -
>>    static void meson_disable_clk(void *data)
>>    {
>>    	clk_disable_unprepare(data);
>> @@ -723,20 +717,9 @@ static int meson_dw_hdmi_bind(struct device *dev, struct device *master,
>>    	meson_dw_hdmi->data = match;
>>    	dw_plat_data = &meson_dw_hdmi->dw_plat_data;
>>    
>> -	meson_dw_hdmi->hdmi_supply = devm_regulator_get_optional(dev, "hdmi");
>> -	if (IS_ERR(meson_dw_hdmi->hdmi_supply)) {
>> -		if (PTR_ERR(meson_dw_hdmi->hdmi_supply) == -EPROBE_DEFER)
>> -			return -EPROBE_DEFER;
>> -		meson_dw_hdmi->hdmi_supply = NULL;
>> -	} else {
>> -		ret = regulator_enable(meson_dw_hdmi->hdmi_supply);
>> -		if (ret)
>> -			return ret;
>> -		ret = devm_add_action_or_reset(dev, meson_disable_regulator,
>> -					       meson_dw_hdmi->hdmi_supply);
>> -		if (ret)
>> -			return ret;
>> -	}
>> +	ret = devm_regulator_get_enable_optional(dev, "hdmi");
>> +	if (ret != -ENODEV)
> 
> The above line should be "if (ret < 0)", otherwise it breaks hdmi support.
> 
> I've noticed this once this change has been merged to linux-next and all
> my Amlogic Meson based boards failed to initialize HDMI. Is it possible
> to fix this in drm tree or do I need to send the incremental fixup?

Nop, please send an incremental fix and I'll apply it asap.

Thanks,
Neil


> 
>> +		return ret;
>>    
>>    	meson_dw_hdmi->hdmitx_apb = devm_reset_control_get_exclusive(dev,
>>    						"hdmitx_apb");
> 
> Best regards


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Re: [RESEND2,v4,2/2] drm/meson: dw-hdmi: Use devm_regulator_*get_enable*()

[Matti Vaittinen]

Hi Marek & All,

ma 9. tammik. 2023 klo 17.23 Neil Armstrong
(neil.armstrong@linaro.org) kirjoitti:
>
> On 09/01/2023 14:46, Marek Szyprowski wrote:
> > Hi Matti,
> >
> > On 30.11.2022 10:23, Matti Vaittinen wrote:
> >> Simplify using the devm_regulator_get_enable_optional(). Also drop the
> >> now unused struct member 'hdmi_supply'.
> >>
> >> Signed-off-by: Matti Vaittinen <mazziesaccount@gmail.com>
> >> Martin Blumenstingl <martin.blumenstingl@googlemail.com>
> >> ---
> >> v4 resend 2:
> >> Respinning unchanged code with the commit title changed as wa suggested
> >> by Robert Foss and commit message changed as was suggested by Martin.
> >>
> >> I am doing a clean-up for my local git and encountered this one.
> >> Respinning as it seems this one fell through the cracks.
> >> ---
> >>    drivers/gpu/drm/meson/meson_dw_hdmi.c | 23 +++--------------------
> >>    1 file changed, 3 insertions(+), 20 deletions(-)
> >>
> >> diff --git a/drivers/gpu/drm/meson/meson_dw_hdmi.c b/drivers/gpu/drm/meson/meson_dw_hdmi.c
> >> index 5cd2b2ebbbd3..7642f740272b 100644
> >> --- a/drivers/gpu/drm/meson/meson_dw_hdmi.c
> >> +++ b/drivers/gpu/drm/meson/meson_dw_hdmi.c
> >> @@ -140,7 +140,6 @@ struct meson_dw_hdmi {
> >>      struct reset_control *hdmitx_apb;
> >>      struct reset_control *hdmitx_ctrl;
> >>      struct reset_control *hdmitx_phy;
> >> -    struct regulator *hdmi_supply;
> >>      u32 irq_stat;
> >>      struct dw_hdmi *hdmi;
> >>      struct drm_bridge *bridge;
> >> @@ -665,11 +664,6 @@ static void meson_dw_hdmi_init(struct meson_dw_hdmi *meson_dw_hdmi)
> >>
> >>    }
> >>
> >> -static void meson_disable_regulator(void *data)
> >> -{
> >> -    regulator_disable(data);
> >> -}
> >> -
> >>    static void meson_disable_clk(void *data)
> >>    {
> >>      clk_disable_unprepare(data);
> >> @@ -723,20 +717,9 @@ static int meson_dw_hdmi_bind(struct device *dev, struct device *master,
> >>      meson_dw_hdmi->data = match;
> >>      dw_plat_data = &meson_dw_hdmi->dw_plat_data;
> >>
> >> -    meson_dw_hdmi->hdmi_supply = devm_regulator_get_optional(dev, "hdmi");
> >> -    if (IS_ERR(meson_dw_hdmi->hdmi_supply)) {
> >> -            if (PTR_ERR(meson_dw_hdmi->hdmi_supply) == -EPROBE_DEFER)
> >> -                    return -EPROBE_DEFER;
> >> -            meson_dw_hdmi->hdmi_supply = NULL;
> >> -    } else {
> >> -            ret = regulator_enable(meson_dw_hdmi->hdmi_supply);
> >> -            if (ret)
> >> -                    return ret;
> >> -            ret = devm_add_action_or_reset(dev, meson_disable_regulator,
> >> -                                           meson_dw_hdmi->hdmi_supply);
> >> -            if (ret)
> >> -                    return ret;
> >> -    }
> >> +    ret = devm_regulator_get_enable_optional(dev, "hdmi");
> >> +    if (ret != -ENODEV)
> >
> > The above line should be "if (ret < 0)", otherwise it breaks hdmi support.
> >

Sorry for the trouble and thanks for pointing this out! I believe the
condition I was looking for was
if (ret && ret != -ENODEV).

At least in my eyes the use of regulator_get_optional() sounds like
the -ENODEV should not be treated as an error. The obvious mistake is
regarding return value 0 as such. Thanks for spotting this!

> > I've noticed this once this change has been merged to linux-next and all
> > my Amlogic Meson based boards failed to initialize HDMI. Is it possible
> > to fix this in drm tree or do I need to send the incremental fixup?
>
> Nop, please send an incremental fix and I'll apply it asap.

Thanks for cleaning-up the mess I caused Marek! Please, let me know if
you want me to cook the fix.

Yours,
- -Matti

-- 

Matti Vaittinen
Linux kernel developer at ROHM Semiconductors
Oulu Finland

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