diff mbox series

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

Message ID df0096b5aea2a18d1540cde379c5abf589ccd7c4.1669799805.git.mazziesaccount@gmail.com
State New
Headers
Series Use devm helpers for regulator get and enable |

Commit Message

Matti Vaittinen Nov. 30, 2022, 9:23 a.m. UTC 
  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(-)

Comments

Neil Armstrong Dec. 1, 2022, 8:38 a.m. UTC | #1 
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");
Matti Vaittinen Dec. 1, 2022, 8:41 a.m. UTC | #2 
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
Marek Szyprowski Jan. 9, 2023, 1:46 p.m. UTC | #3 
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
Neil Armstrong Jan. 9, 2023, 3:23 p.m. UTC | #4 
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
Matti Vaittinen Jan. 9, 2023, 6:30 p.m. UTC | #5 
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
diff mbox series

Patch

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");