[PATCH v1 1/2] drm/panel: simple-panel: add the delay timing for Sharp LQ123P1JX31

[PATCH v1 1/2] drm/panel: simple-panel: add the delay timing for Sharp LQ123P1JX31

[Yakir Yang]

According to page 16 of Sharp LQ123P1JX31 datasheet, we need to add the
missing delay timing. Panel prepare time should be t1 (0.5ms~10ms) plus
t3 (0ms~100ms), and panel enable time should equal to t7 (0ms~50ms), and
panel unprepare time should be t11 (1ms~50ms) plus t12 (500ms~).

Signed-off-by: Yakir Yang <ykk@rock-chips.com>
---
 drivers/gpu/drm/panel/panel-simple.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c
index 85143d1..f178998 100644
--- a/drivers/gpu/drm/panel/panel-simple.c
+++ b/drivers/gpu/drm/panel/panel-simple.c
@@ -1384,6 +1384,11 @@ static const struct panel_desc sharp_lq123p1jx31 = {
 		.width = 259,
 		.height = 173,
 	},
+	.delay = {
+		.prepare = 110,
+		.enable = 50,
+		.unprepare = 550,
+	},
 };
 
 static const struct drm_display_mode shelly_sca07010_bfn_lnn_mode = {
-- 
1.9.1

[PATCH v1 2/2] drm/bridge: analogix_dp: turn off the panel when eDP need to disable

[Yakir Yang]

Some panels (like Sharp LQ123P1JX31) need to be turn off when eDP
controller stop to send valid video signal, otherwhise panel would
go burn in, and keep flicker and flicker.

So it's better to turn off the panel when eDP need to disable, and
we need to turn on the panel in connector->detect() callback, so
that driver would detect panel status rightly.

Signed-off-by: Yakir Yang <ykk@rock-chips.com>
---
 drivers/gpu/drm/bridge/analogix/analogix_dp_core.c | 18 ++++++++++--------
 1 file changed, 10 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
index 32715da..ea059b3 100644
--- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
+++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
@@ -961,6 +961,14 @@ analogix_dp_detect(struct drm_connector *connector, bool force)
 {
 	struct analogix_dp_device *dp = to_dp(connector);
 
+	/*
+	 * Panle would prepare for several times here, but don't worry it
+	 * would only enable the hardware at the first prepare time.
+	 */
+	if (dp->plat_data->panel)
+		if (drm_panel_prepare(dp->plat_data->panel))
+			DRM_ERROR("failed to setup the panel\n");
+
 	if (analogix_dp_detect_hpd(dp))
 		return connector_status_disconnected;
 
@@ -1063,7 +1071,8 @@ static void analogix_dp_bridge_disable(struct drm_bridge *bridge)
 		return;
 
 	if (dp->plat_data->panel) {
-		if (drm_panel_disable(dp->plat_data->panel)) {
+		if (drm_panel_disable(dp->plat_data->panel) ||
+		    drm_panel_unprepare(dp->plat_data->panel)) {
 			DRM_ERROR("failed to disable the panel\n");
 			return;
 		}
@@ -1333,13 +1342,6 @@ int analogix_dp_bind(struct device *dev, struct drm_device *drm_dev,
 
 	phy_power_on(dp->phy);
 
-	if (dp->plat_data->panel) {
-		if (drm_panel_prepare(dp->plat_data->panel)) {
-			DRM_ERROR("failed to setup the panel\n");
-			return -EBUSY;
-		}
-	}
-
 	analogix_dp_init_dp(dp);
 
 	ret = devm_request_threaded_irq(&pdev->dev, dp->irq,
-- 
1.9.1

Re: [PATCH v1 2/2] drm/bridge: analogix_dp: turn off the panel when eDP need to disable

[Sean Paul]

On Thu, Jul 21, 2016 at 9:14 AM, Yakir Yang <ykk@rock-chips.com> wrote:
> Some panels (like Sharp LQ123P1JX31) need to be turn off when eDP
> controller stop to send valid video signal, otherwhise panel would
> go burn in, and keep flicker and flicker.
>
> So it's better to turn off the panel when eDP need to disable, and
> we need to turn on the panel in connector->detect() callback, so
> that driver would detect panel status rightly.
>
> Signed-off-by: Yakir Yang <ykk@rock-chips.com>
> ---
>  drivers/gpu/drm/bridge/analogix/analogix_dp_core.c | 18 ++++++++++--------
>  1 file changed, 10 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
> index 32715da..ea059b3 100644
> --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
> +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
> @@ -961,6 +961,14 @@ analogix_dp_detect(struct drm_connector *connector, bool force)
>  {
>         struct analogix_dp_device *dp = to_dp(connector);
>
> +       /*
> +        * Panle would prepare for several times here, but don't worry it

s/Panle/Panel/

> +        * would only enable the hardware at the first prepare time.


Errr, this shouldn't go in detect. How about putting this in
bridge_enable instead?

> +        */
> +       if (dp->plat_data->panel)
> +               if (drm_panel_prepare(dp->plat_data->panel))

Personally, I don't like doing work in a conditional since you're
throwing the return code away. Could you break this out into:

ret = drm_panel_prepare(dp->plat_data->panel);
if (ret)
  DRM_ERROR("failed to setup the panel ret=%d\n", ret);

> +                       DRM_ERROR("failed to setup the panel\n");
> +
>         if (analogix_dp_detect_hpd(dp))
>                 return connector_status_disconnected;
>
> @@ -1063,7 +1071,8 @@ static void analogix_dp_bridge_disable(struct drm_bridge *bridge)
>                 return;
>
>         if (dp->plat_data->panel) {
> -               if (drm_panel_disable(dp->plat_data->panel)) {
> +               if (drm_panel_disable(dp->plat_data->panel) ||
> +                   drm_panel_unprepare(dp->plat_data->panel)) {

Same comment here, please break this out into separate statements for
better readability/logging.

>                         DRM_ERROR("failed to disable the panel\n");
>                         return;
>                 }
> @@ -1333,13 +1342,6 @@ int analogix_dp_bind(struct device *dev, struct drm_device *drm_dev,
>
>         phy_power_on(dp->phy);
>
> -       if (dp->plat_data->panel) {
> -               if (drm_panel_prepare(dp->plat_data->panel)) {
> -                       DRM_ERROR("failed to setup the panel\n");
> -                       return -EBUSY;
> -               }
> -       }
> -
>         analogix_dp_init_dp(dp);
>
>         ret = devm_request_threaded_irq(&pdev->dev, dp->irq,
> --
> 1.9.1
>
>

Re: [PATCH v1 2/2] drm/bridge: analogix_dp: turn off the panel when eDP need to disable

[Yakir Yang]

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Sean,

Thanks for your fast respond :-)

But this patch is not the latest one, I have upgraded this to "v1.1" 
version to fix the eDP can't be disabled problem:
     [PATCH v1.1 2/2] drm/bridge: analogix_dp: turn off the panel when 
eDP need to disable
         Changes in v1.1: - unprepare the panel at the end of 
bridge->disable() function

In spite of this, I would take your comments with my "v1.1" patch.

On 07/21/2016 10:28 PM, Sean Paul wrote:
> On Thu, Jul 21, 2016 at 9:14 AM, Yakir Yang <ykk@rock-chips.com> wrote:
>> Some panels (like Sharp LQ123P1JX31) need to be turn off when eDP
>> controller stop to send valid video signal, otherwhise panel would
>> go burn in, and keep flicker and flicker.
>>
>> So it's better to turn off the panel when eDP need to disable, and
>> we need to turn on the panel in connector->detect() callback, so
>> that driver would detect panel status rightly.
>>
>> Signed-off-by: Yakir Yang <ykk@rock-chips.com>
>> ---
>>   drivers/gpu/drm/bridge/analogix/analogix_dp_core.c | 18 ++++++++++--------
>>   1 file changed, 10 insertions(+), 8 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
>> index 32715da..ea059b3 100644
>> --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
>> +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
>> @@ -961,6 +961,14 @@ analogix_dp_detect(struct drm_connector *connector, bool force)
>>   {
>>          struct analogix_dp_device *dp = to_dp(connector);
>>
>> +       /*
>> +        * Panle would prepare for several times here, but don't worry it
> s/Panle/Panel/

Done

>> +        * would only enable the hardware at the first prepare time.
>
> Errr, this shouldn't go in detect. How about putting this in
> bridge_enable instead?

Nope, if we put this in bridge_enable, then eDP would never be enabled. 
Here're the calling flow.

--> analogix_dp_probe
   --> analogix_dp_bind  # we still haven't prepared the panel here, 
that means panel have been powered up
     --> analogix_dp_detect  # Oops, losing panel valid hotplug signal, 
cause panel have been powered up
     --> ** Keep detecting **

>> +        */
>> +       if (dp->plat_data->panel)
>> +               if (drm_panel_prepare(dp->plat_data->panel))
> Personally, I don't like doing work in a conditional since you're
> throwing the return code away. Could you break this out into:
>
> ret = drm_panel_prepare(dp->plat_data->panel);
> if (ret)
>    DRM_ERROR("failed to setup the panel ret=%d\n", ret);

Okay

>
>> +                       DRM_ERROR("failed to setup the panel\n");
>> +
>>          if (analogix_dp_detect_hpd(dp))
>>                  return connector_status_disconnected;
>>
>> @@ -1063,7 +1071,8 @@ static void analogix_dp_bridge_disable(struct drm_bridge *bridge)
>>                  return;
>>
>>          if (dp->plat_data->panel) {
>> -               if (drm_panel_disable(dp->plat_data->panel)) {
>> +               if (drm_panel_disable(dp->plat_data->panel) ||
>> +                   drm_panel_unprepare(dp->plat_data->panel)) {
> Same comment here, please break this out into separate statements for
> better readability/logging.

Okay,


Thanks,
- Yakir

>
>>                          DRM_ERROR("failed to disable the panel\n");
>>                          return;
>>                  }
>> @@ -1333,13 +1342,6 @@ int analogix_dp_bind(struct device *dev, struct drm_device *drm_dev,
>>
>>          phy_power_on(dp->phy);
>>
>> -       if (dp->plat_data->panel) {
>> -               if (drm_panel_prepare(dp->plat_data->panel)) {
>> -                       DRM_ERROR("failed to setup the panel\n");
>> -                       return -EBUSY;
>> -               }
>> -       }
>> -
>>          analogix_dp_init_dp(dp);
>>
>>          ret = devm_request_threaded_irq(&pdev->dev, dp->irq,
>> --
>> 1.9.1
>>
>>
>
>


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Re: [PATCH v1 2/2] drm/bridge: analogix_dp: turn off the panel when eDP need to disable

[Sean Paul]

On Thu, Jul 21, 2016 at 9:00 PM, Yakir Yang <ykk@rock-chips.com> wrote:
> Sean,
>
> Thanks for your fast respond :-)
>
> But this patch is not the latest one, I have upgraded this to "v1.1" version
> to fix the eDP can't be disabled problem:
>     [PATCH v1.1 2/2] drm/bridge: analogix_dp: turn off the panel when eDP
> need to disable
>         Changes in v1.1: - unprepare the panel at the end of
> bridge->disable() function
>
> In spite of this, I would take your comments with my "v1.1" patch.
>
> On 07/21/2016 10:28 PM, Sean Paul wrote:
>
> On Thu, Jul 21, 2016 at 9:14 AM, Yakir Yang <ykk@rock-chips.com> wrote:
>
> Some panels (like Sharp LQ123P1JX31) need to be turn off when eDP
> controller stop to send valid video signal, otherwhise panel would
> go burn in, and keep flicker and flicker.
>
> So it's better to turn off the panel when eDP need to disable, and
> we need to turn on the panel in connector->detect() callback, so
> that driver would detect panel status rightly.
>
> Signed-off-by: Yakir Yang <ykk@rock-chips.com>
> ---
>  drivers/gpu/drm/bridge/analogix/analogix_dp_core.c | 18 ++++++++++--------
>  1 file changed, 10 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
> b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
> index 32715da..ea059b3 100644
> --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
> +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
> @@ -961,6 +961,14 @@ analogix_dp_detect(struct drm_connector *connector,
> bool force)
>  {
>         struct analogix_dp_device *dp = to_dp(connector);
>
> +       /*
> +        * Panle would prepare for several times here, but don't worry it
>
> s/Panle/Panel/
>
>
> Done
>
> +        * would only enable the hardware at the first prepare time.
>
> Errr, this shouldn't go in detect. How about putting this in
> bridge_enable instead?
>
>
> Nope, if we put this in bridge_enable, then eDP would never be enabled.
> Here're the calling flow.
>
> --> analogix_dp_probe
>   --> analogix_dp_bind  # we still haven't prepared the panel here, that
> means panel have been powered up
>     --> analogix_dp_detect  # Oops, losing panel valid hotplug signal, cause
> panel have been powered up
>     --> ** Keep detecting **


Yeah, after playing around with the patch yesterday I discovered this
for myself. I still don't think detect() should be changing hardware
state. Perhaps you could add a matching unprepare() after you attempt
to detect the panel?

Sean

>
> +        */
> +       if (dp->plat_data->panel)
> +               if (drm_panel_prepare(dp->plat_data->panel))
>
> Personally, I don't like doing work in a conditional since you're
> throwing the return code away. Could you break this out into:
>
> ret = drm_panel_prepare(dp->plat_data->panel);
> if (ret)
>   DRM_ERROR("failed to setup the panel ret=%d\n", ret);
>
>
> Okay
>
>
> +                       DRM_ERROR("failed to setup the panel\n");
> +
>         if (analogix_dp_detect_hpd(dp))
>                 return connector_status_disconnected;
>
> @@ -1063,7 +1071,8 @@ static void analogix_dp_bridge_disable(struct
> drm_bridge *bridge)
>                 return;
>
>         if (dp->plat_data->panel) {
> -               if (drm_panel_disable(dp->plat_data->panel)) {
> +               if (drm_panel_disable(dp->plat_data->panel) ||
> +                   drm_panel_unprepare(dp->plat_data->panel)) {
>
> Same comment here, please break this out into separate statements for
> better readability/logging.
>
>
> Okay,
>
>
> Thanks,
> - Yakir
>
>
>                         DRM_ERROR("failed to disable the panel\n");
>                         return;
>                 }
> @@ -1333,13 +1342,6 @@ int analogix_dp_bind(struct device *dev, struct
> drm_device *drm_dev,
>
>         phy_power_on(dp->phy);
>
> -       if (dp->plat_data->panel) {
> -               if (drm_panel_prepare(dp->plat_data->panel)) {
> -                       DRM_ERROR("failed to setup the panel\n");
> -                       return -EBUSY;
> -               }
> -       }
> -
>         analogix_dp_init_dp(dp);
>
>         ret = devm_request_threaded_irq(&pdev->dev, dp->irq,
> --
> 1.9.1
>
>
>
>
>

Re: [PATCH v1 2/2] drm/bridge: analogix_dp: turn off the panel when eDP need to disable

[Yakir Yang]

Sean,

Oops, sorry about miss your suggest :(

On 07/22/2016 11:03 PM, Sean Paul wrote:
> On Thu, Jul 21, 2016 at 9:00 PM, Yakir Yang <ykk@rock-chips.com> wrote:
>> Sean,
>>
>> Thanks for your fast respond :-)
>>
>> But this patch is not the latest one, I have upgraded this to "v1.1" version
>> to fix the eDP can't be disabled problem:
>>      [PATCH v1.1 2/2] drm/bridge: analogix_dp: turn off the panel when eDP
>> need to disable
>>          Changes in v1.1: - unprepare the panel at the end of
>> bridge->disable() function
>>
>> In spite of this, I would take your comments with my "v1.1" patch.
>>
>> On 07/21/2016 10:28 PM, Sean Paul wrote:
>>
>> On Thu, Jul 21, 2016 at 9:14 AM, Yakir Yang <ykk@rock-chips.com> wrote:
>>
>> Some panels (like Sharp LQ123P1JX31) need to be turn off when eDP
>> controller stop to send valid video signal, otherwhise panel would
>> go burn in, and keep flicker and flicker.
>>
>> So it's better to turn off the panel when eDP need to disable, and
>> we need to turn on the panel in connector->detect() callback, so
>> that driver would detect panel status rightly.
>>
>> Signed-off-by: Yakir Yang <ykk@rock-chips.com>
>> ---
>>   drivers/gpu/drm/bridge/analogix/analogix_dp_core.c | 18 ++++++++++--------
>>   1 file changed, 10 insertions(+), 8 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
>> b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
>> index 32715da..ea059b3 100644
>> --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
>> +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
>> @@ -961,6 +961,14 @@ analogix_dp_detect(struct drm_connector *connector,
>> bool force)
>>   {
>>          struct analogix_dp_device *dp = to_dp(connector);
>>
>> +       /*
>> +        * Panle would prepare for several times here, but don't worry it
>>
>> s/Panle/Panel/
>>
>>
>> Done
>>
>> +        * would only enable the hardware at the first prepare time.
>>
>> Errr, this shouldn't go in detect. How about putting this in
>> bridge_enable instead?
>>
>>
>> Nope, if we put this in bridge_enable, then eDP would never be enabled.
>> Here're the calling flow.
>>
>> --> analogix_dp_probe
>>    --> analogix_dp_bind  # we still haven't prepared the panel here, that
>> means panel have been powered up
>>      --> analogix_dp_detect  # Oops, losing panel valid hotplug signal, cause
>> panel have been powered up
>>      --> ** Keep detecting **
>
> Yeah, after playing around with the patch yesterday I discovered this
> for myself. I still don't think detect() should be changing hardware
> state. Perhaps you could add a matching unprepare() after you attempt
> to detect the panel?

Hmm, I don't understand the meaning of "add a matching unprepare()".

I didn't see there is an unprepare() callback in drm_crtc_helper.h, would
you like to share some simple code :-D

Thanks,
- Yakir

> Sean
>
>> +        */
>> +       if (dp->plat_data->panel)
>> +               if (drm_panel_prepare(dp->plat_data->panel))
>>
>> Personally, I don't like doing work in a conditional since you're
>> throwing the return code away. Could you break this out into:
>>
>> ret = drm_panel_prepare(dp->plat_data->panel);
>> if (ret)
>>    DRM_ERROR("failed to setup the panel ret=%d\n", ret);
>>
>>
>> Okay
>>
>>
>> +                       DRM_ERROR("failed to setup the panel\n");
>> +
>>          if (analogix_dp_detect_hpd(dp))
>>                  return connector_status_disconnected;
>>
>> @@ -1063,7 +1071,8 @@ static void analogix_dp_bridge_disable(struct
>> drm_bridge *bridge)
>>                  return;
>>
>>          if (dp->plat_data->panel) {
>> -               if (drm_panel_disable(dp->plat_data->panel)) {
>> +               if (drm_panel_disable(dp->plat_data->panel) ||
>> +                   drm_panel_unprepare(dp->plat_data->panel)) {
>>
>> Same comment here, please break this out into separate statements for
>> better readability/logging.
>>
>>
>> Okay,
>>
>>
>> Thanks,
>> - Yakir
>>
>>
>>                          DRM_ERROR("failed to disable the panel\n");
>>                          return;
>>                  }
>> @@ -1333,13 +1342,6 @@ int analogix_dp_bind(struct device *dev, struct
>> drm_device *drm_dev,
>>
>>          phy_power_on(dp->phy);
>>
>> -       if (dp->plat_data->panel) {
>> -               if (drm_panel_prepare(dp->plat_data->panel)) {
>> -                       DRM_ERROR("failed to setup the panel\n");
>> -                       return -EBUSY;
>> -               }
>> -       }
>> -
>>          analogix_dp_init_dp(dp);
>>
>>          ret = devm_request_threaded_irq(&pdev->dev, dp->irq,
>> --
>> 1.9.1
>>
>>
>>
>>
>>
>
>

Re: [PATCH v1 2/2] drm/bridge: analogix_dp: turn off the panel when eDP need to disable

[Sean Paul]

On Wed, Jul 27, 2016 at 11:28 PM, Yakir Yang <ykk@rock-chips.com> wrote:
> Sean,
>
> Oops, sorry about miss your suggest :(
>
>
> On 07/22/2016 11:03 PM, Sean Paul wrote:
>>
>> On Thu, Jul 21, 2016 at 9:00 PM, Yakir Yang <ykk@rock-chips.com> wrote:
>>>
>>> Sean,
>>>
>>> Thanks for your fast respond :-)
>>>
>>> But this patch is not the latest one, I have upgraded this to "v1.1"
>>> version
>>> to fix the eDP can't be disabled problem:
>>>      [PATCH v1.1 2/2] drm/bridge: analogix_dp: turn off the panel when
>>> eDP
>>> need to disable
>>>          Changes in v1.1: - unprepare the panel at the end of
>>> bridge->disable() function
>>>
>>> In spite of this, I would take your comments with my "v1.1" patch.
>>>
>>> On 07/21/2016 10:28 PM, Sean Paul wrote:
>>>
>>> On Thu, Jul 21, 2016 at 9:14 AM, Yakir Yang <ykk@rock-chips.com> wrote:
>>>
>>> Some panels (like Sharp LQ123P1JX31) need to be turn off when eDP
>>> controller stop to send valid video signal, otherwhise panel would
>>> go burn in, and keep flicker and flicker.
>>>
>>> So it's better to turn off the panel when eDP need to disable, and
>>> we need to turn on the panel in connector->detect() callback, so
>>> that driver would detect panel status rightly.
>>>
>>> Signed-off-by: Yakir Yang <ykk@rock-chips.com>
>>> ---
>>>   drivers/gpu/drm/bridge/analogix/analogix_dp_core.c | 18
>>> ++++++++++--------
>>>   1 file changed, 10 insertions(+), 8 deletions(-)
>>>
>>> diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
>>> b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
>>> index 32715da..ea059b3 100644
>>> --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
>>> +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
>>> @@ -961,6 +961,14 @@ analogix_dp_detect(struct drm_connector *connector,
>>> bool force)
>>>   {
>>>          struct analogix_dp_device *dp = to_dp(connector);
>>>
>>> +       /*
>>> +        * Panle would prepare for several times here, but don't worry it
>>>
>>> s/Panle/Panel/
>>>
>>>
>>> Done
>>>
>>> +        * would only enable the hardware at the first prepare time.
>>>
>>> Errr, this shouldn't go in detect. How about putting this in
>>> bridge_enable instead?
>>>
>>>
>>> Nope, if we put this in bridge_enable, then eDP would never be enabled.
>>> Here're the calling flow.
>>>
>>> --> analogix_dp_probe
>>>    --> analogix_dp_bind  # we still haven't prepared the panel here, that
>>> means panel have been powered up
>>>      --> analogix_dp_detect  # Oops, losing panel valid hotplug signal,
>>> cause
>>> panel have been powered up
>>>      --> ** Keep detecting **
>>
>>
>> Yeah, after playing around with the patch yesterday I discovered this
>> for myself. I still don't think detect() should be changing hardware
>> state. Perhaps you could add a matching unprepare() after you attempt
>> to detect the panel?
>
>
> Hmm, I don't understand the meaning of "add a matching unprepare()".
>
> I didn't see there is an unprepare() callback in drm_crtc_helper.h, would
> you like to share some simple code :-D
>

In other words, make sure the hardware is in the same state at the
beginning and end of detect(). You shouldn't have the panel in a
different state when you exit detect().

Sean



> Thanks,
> - Yakir
>
>
>> Sean
>>
>>> +        */
>>> +       if (dp->plat_data->panel)
>>> +               if (drm_panel_prepare(dp->plat_data->panel))
>>>
>>> Personally, I don't like doing work in a conditional since you're
>>> throwing the return code away. Could you break this out into:
>>>
>>> ret = drm_panel_prepare(dp->plat_data->panel);
>>> if (ret)
>>>    DRM_ERROR("failed to setup the panel ret=%d\n", ret);
>>>
>>>
>>> Okay
>>>
>>>
>>> +                       DRM_ERROR("failed to setup the panel\n");
>>> +
>>>          if (analogix_dp_detect_hpd(dp))
>>>                  return connector_status_disconnected;
>>>
>>> @@ -1063,7 +1071,8 @@ static void analogix_dp_bridge_disable(struct
>>> drm_bridge *bridge)
>>>                  return;
>>>
>>>          if (dp->plat_data->panel) {
>>> -               if (drm_panel_disable(dp->plat_data->panel)) {
>>> +               if (drm_panel_disable(dp->plat_data->panel) ||
>>> +                   drm_panel_unprepare(dp->plat_data->panel)) {
>>>
>>> Same comment here, please break this out into separate statements for
>>> better readability/logging.
>>>
>>>
>>> Okay,
>>>
>>>
>>> Thanks,
>>> - Yakir
>>>
>>>
>>>                          DRM_ERROR("failed to disable the panel\n");
>>>                          return;
>>>                  }
>>> @@ -1333,13 +1342,6 @@ int analogix_dp_bind(struct device *dev, struct
>>> drm_device *drm_dev,
>>>
>>>          phy_power_on(dp->phy);
>>>
>>> -       if (dp->plat_data->panel) {
>>> -               if (drm_panel_prepare(dp->plat_data->panel)) {
>>> -                       DRM_ERROR("failed to setup the panel\n");
>>> -                       return -EBUSY;
>>> -               }
>>> -       }
>>> -
>>>          analogix_dp_init_dp(dp);
>>>
>>>          ret = devm_request_threaded_irq(&pdev->dev, dp->irq,
>>> --
>>> 1.9.1
>>>
>>>
>>>
>>>
>>>
>>
>>
>
>
> --
> To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc"
> in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html

Re: [PATCH v1 2/2] drm/bridge: analogix_dp: turn off the panel when eDP need to disable

[Sean Paul]

On Wed, Jul 27, 2016 at 11:28 PM, Yakir Yang <ykk@rock-chips.com> wrote:
> Sean,
>
> Oops, sorry about miss your suggest :(
>
>
> On 07/22/2016 11:03 PM, Sean Paul wrote:
>>
>> On Thu, Jul 21, 2016 at 9:00 PM, Yakir Yang <ykk@rock-chips.com> wrote:
>>>
>>> Sean,
>>>
>>> Thanks for your fast respond :-)
>>>
>>> But this patch is not the latest one, I have upgraded this to "v1.1"
>>> version
>>> to fix the eDP can't be disabled problem:
>>>      [PATCH v1.1 2/2] drm/bridge: analogix_dp: turn off the panel when
>>> eDP
>>> need to disable
>>>          Changes in v1.1: - unprepare the panel at the end of
>>> bridge->disable() function
>>>
>>> In spite of this, I would take your comments with my "v1.1" patch.
>>>
>>> On 07/21/2016 10:28 PM, Sean Paul wrote:
>>>
>>> On Thu, Jul 21, 2016 at 9:14 AM, Yakir Yang <ykk@rock-chips.com> wrote:
>>>
>>> Some panels (like Sharp LQ123P1JX31) need to be turn off when eDP
>>> controller stop to send valid video signal, otherwhise panel would
>>> go burn in, and keep flicker and flicker.
>>>
>>> So it's better to turn off the panel when eDP need to disable, and
>>> we need to turn on the panel in connector->detect() callback, so
>>> that driver would detect panel status rightly.
>>>
>>> Signed-off-by: Yakir Yang <ykk@rock-chips.com>
>>> ---
>>>   drivers/gpu/drm/bridge/analogix/analogix_dp_core.c | 18
>>> ++++++++++--------
>>>   1 file changed, 10 insertions(+), 8 deletions(-)
>>>
>>> diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
>>> b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
>>> index 32715da..ea059b3 100644
>>> --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
>>> +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
>>> @@ -961,6 +961,14 @@ analogix_dp_detect(struct drm_connector *connector,
>>> bool force)
>>>   {
>>>          struct analogix_dp_device *dp = to_dp(connector);
>>>
>>> +       /*
>>> +        * Panle would prepare for several times here, but don't worry it
>>>
>>> s/Panle/Panel/
>>>
>>>
>>> Done
>>>
>>> +        * would only enable the hardware at the first prepare time.
>>>
>>> Errr, this shouldn't go in detect. How about putting this in
>>> bridge_enable instead?
>>>
>>>
>>> Nope, if we put this in bridge_enable, then eDP would never be enabled.
>>> Here're the calling flow.
>>>
>>> --> analogix_dp_probe
>>>    --> analogix_dp_bind  # we still haven't prepared the panel here, that
>>> means panel have been powered up
>>>      --> analogix_dp_detect  # Oops, losing panel valid hotplug signal,
>>> cause
>>> panel have been powered up
>>>      --> ** Keep detecting **
>>
>>
>> Yeah, after playing around with the patch yesterday I discovered this
>> for myself. I still don't think detect() should be changing hardware
>> state. Perhaps you could add a matching unprepare() after you attempt
>> to detect the panel?
>
>
> Hmm, I don't understand the meaning of "add a matching unprepare()".
>
> I didn't see there is an unprepare() callback in drm_crtc_helper.h, would
> you like to share some simple code :-D
>

In other words, make sure the hardware is in the same state at the
beginning and end of detect(). You shouldn't have the panel in a
different state when you exit detect().

Sean



> Thanks,
> - Yakir
>
>
>> Sean
>>
>>> +        */
>>> +       if (dp->plat_data->panel)
>>> +               if (drm_panel_prepare(dp->plat_data->panel))
>>>
>>> Personally, I don't like doing work in a conditional since you're
>>> throwing the return code away. Could you break this out into:
>>>
>>> ret = drm_panel_prepare(dp->plat_data->panel);
>>> if (ret)
>>>    DRM_ERROR("failed to setup the panel ret=%d\n", ret);
>>>
>>>
>>> Okay
>>>
>>>
>>> +                       DRM_ERROR("failed to setup the panel\n");
>>> +
>>>          if (analogix_dp_detect_hpd(dp))
>>>                  return connector_status_disconnected;
>>>
>>> @@ -1063,7 +1071,8 @@ static void analogix_dp_bridge_disable(struct
>>> drm_bridge *bridge)
>>>                  return;
>>>
>>>          if (dp->plat_data->panel) {
>>> -               if (drm_panel_disable(dp->plat_data->panel)) {
>>> +               if (drm_panel_disable(dp->plat_data->panel) ||
>>> +                   drm_panel_unprepare(dp->plat_data->panel)) {
>>>
>>> Same comment here, please break this out into separate statements for
>>> better readability/logging.
>>>
>>>
>>> Okay,
>>>
>>>
>>> Thanks,
>>> - Yakir
>>>
>>>
>>>                          DRM_ERROR("failed to disable the panel\n");
>>>                          return;
>>>                  }
>>> @@ -1333,13 +1342,6 @@ int analogix_dp_bind(struct device *dev, struct
>>> drm_device *drm_dev,
>>>
>>>          phy_power_on(dp->phy);
>>>
>>> -       if (dp->plat_data->panel) {
>>> -               if (drm_panel_prepare(dp->plat_data->panel)) {
>>> -                       DRM_ERROR("failed to setup the panel\n");
>>> -                       return -EBUSY;
>>> -               }
>>> -       }
>>> -
>>>          analogix_dp_init_dp(dp);
>>>
>>>          ret = devm_request_threaded_irq(&pdev->dev, dp->irq,
>>> --
>>> 1.9.1
>>>
>>>
>>>
>>>
>>>
>>
>>
>
>
> --
> To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc"
> in
> the body of a message to majordomo@vger.kernel.org
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[PATCH] drm/analogix_dp: Ensure the panel is properly prepared/unprepared

[Sean Paul]

Instead of just preparing the panel on bind, actually prepare/unprepare
during modeset/disable. The panel must be prepared in order to read hpd
status, so we need to refcount the prepares in order to ensure we don't
accidentally turn the panel off at the wrong time.

Signed-off-by: Sean Paul <seanpaul@chromium.org>
---


Hi Yakir,
This is what I was talking about upthread. I've tested it and it seems to be working.

What do you think?

Sean



drivers/gpu/drm/bridge/analogix/analogix_dp_core.c | 48 +++++++++++++++++-----
 1 file changed, 37 insertions(+), 11 deletions(-)

diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
index 32715da..7b764a4 100644
--- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
+++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
@@ -960,11 +960,27 @@ enum drm_connector_status
 analogix_dp_detect(struct drm_connector *connector, bool force)
 {
 	struct analogix_dp_device *dp = to_dp(connector);
+	enum drm_connector_status status = connector_status_disconnected;
+	int ret;
 
-	if (analogix_dp_detect_hpd(dp))
-		return connector_status_disconnected;
+	if (dp->plat_data->panel && dp->dpms_mode != DRM_MODE_DPMS_ON) {
+		ret = drm_panel_prepare(dp->plat_data->panel);
+		if (ret) {
+			DRM_ERROR("failed to setup panel (%d)\n", ret);
+			return connector_status_disconnected;
+		}
+	}
+
+	if (!analogix_dp_detect_hpd(dp))
+		status = connector_status_connected;
+
+	if (dp->plat_data->panel && dp->dpms_mode != DRM_MODE_DPMS_ON) {
+		ret = drm_panel_unprepare(dp->plat_data->panel);
+		if (ret)
+			DRM_ERROR("failed to setup the panel ret = %d\n", ret);
+	}
 
-	return connector_status_connected;
+	return status;
 }
 
 static void analogix_dp_connector_destroy(struct drm_connector *connector)
@@ -1035,6 +1051,18 @@ static int analogix_dp_bridge_attach(struct drm_bridge *bridge)
 	return 0;
 }
 
+static void analogix_dp_bridge_pre_enable(struct drm_bridge *bridge)
+{
+	struct analogix_dp_device *dp = bridge->driver_private;
+	int ret;
+
+	if (dp->plat_data->panel) {
+		ret = drm_panel_prepare(dp->plat_data->panel);
+		if (ret)
+			DRM_ERROR("failed to setup the panel ret = %d\n", ret);
+	}
+}
+
 static void analogix_dp_bridge_enable(struct drm_bridge *bridge)
 {
 	struct analogix_dp_device *dp = bridge->driver_private;
@@ -1058,6 +1086,7 @@ static void analogix_dp_bridge_enable(struct drm_bridge *bridge)
 static void analogix_dp_bridge_disable(struct drm_bridge *bridge)
 {
 	struct analogix_dp_device *dp = bridge->driver_private;
+	int ret;
 
 	if (dp->dpms_mode != DRM_MODE_DPMS_ON)
 		return;
@@ -1077,6 +1106,10 @@ static void analogix_dp_bridge_disable(struct drm_bridge *bridge)
 
 	pm_runtime_put_sync(dp->dev);
 
+	ret = drm_panel_unprepare(dp->plat_data->panel);
+	if (ret)
+		DRM_ERROR("failed to setup the panel ret = %d\n", ret);
+
 	dp->dpms_mode = DRM_MODE_DPMS_OFF;
 }
 
@@ -1165,9 +1198,9 @@ static void analogix_dp_bridge_nop(struct drm_bridge *bridge)
 }
 
 static const struct drm_bridge_funcs analogix_dp_bridge_funcs = {
+	.pre_enable = analogix_dp_bridge_pre_enable,
 	.enable = analogix_dp_bridge_enable,
 	.disable = analogix_dp_bridge_disable,
-	.pre_enable = analogix_dp_bridge_nop,
 	.post_disable = analogix_dp_bridge_nop,
 	.mode_set = analogix_dp_bridge_mode_set,
 	.attach = analogix_dp_bridge_attach,
@@ -1333,13 +1366,6 @@ int analogix_dp_bind(struct device *dev, struct drm_device *drm_dev,
 
 	phy_power_on(dp->phy);
 
-	if (dp->plat_data->panel) {
-		if (drm_panel_prepare(dp->plat_data->panel)) {
-			DRM_ERROR("failed to setup the panel\n");
-			return -EBUSY;
-		}
-	}
-
 	analogix_dp_init_dp(dp);
 
 	ret = devm_request_threaded_irq(&pdev->dev, dp->irq,
-- 
2.8.0.rc3.226.g39d4020

Re: [PATCH] drm/analogix_dp: Ensure the panel is properly prepared/unprepared

[Yakir Yang]

Sean,

On 07/30/2016 03:16 AM, Sean Paul wrote:
> Instead of just preparing the panel on bind, actually prepare/unprepare
> during modeset/disable. The panel must be prepared in order to read hpd
> status, so we need to refcount the prepares in order to ensure we don't
> accidentally turn the panel off at the wrong time.
>
> Signed-off-by: Sean Paul <seanpaul@chromium.org>
> ---
>
>
> Hi Yakir,
> This is what I was talking about upthread. I've tested it and it seems to be working.
>
> What do you think?

Thanks for your patch, and it works. But I have introduced two 
questions, and I haven't found a way to fixed them.

> Sean
>
>
>
> drivers/gpu/drm/bridge/analogix/analogix_dp_core.c | 48 +++++++++++++++++-----
>   1 file changed, 37 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
> index 32715da..7b764a4 100644
> --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
> +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
> @@ -960,11 +960,27 @@ enum drm_connector_status
>   analogix_dp_detect(struct drm_connector *connector, bool force)
>   {
>   	struct analogix_dp_device *dp = to_dp(connector);
> +	enum drm_connector_status status = connector_status_disconnected;
> +	int ret;
>   
> -	if (analogix_dp_detect_hpd(dp))
> -		return connector_status_disconnected;
> +	if (dp->plat_data->panel && dp->dpms_mode != DRM_MODE_DPMS_ON) {
> +		ret = drm_panel_prepare(dp->plat_data->panel);
> +		if (ret) {
> +			DRM_ERROR("failed to setup panel (%d)\n", ret);
> +			return connector_status_disconnected;
> +		}
> +	}
> +
> +	if (!analogix_dp_detect_hpd(dp))
> +		status = connector_status_connected;
> +
> +	if (dp->plat_data->panel && dp->dpms_mode != DRM_MODE_DPMS_ON) {
> +		ret = drm_panel_unprepare(dp->plat_data->panel);
> +		if (ret)
> +			DRM_ERROR("failed to setup the panel ret = %d\n", ret);
> +	}
>   
> -	return connector_status_connected;
> +	return status;

1. Panel would flicker at system boot time. Your patch would flash the 
panel power in connector->detect() function when dp->dpms_mode isn't 
DRM_MODE_DPMS_OFF. So when userspace keep detect the connector status in 
boot time, we could see panel would flicker (light up for a while, and 
turn off again, and keep loop for several time). I have copied some 
kernel logs:


[   11.065267] YKK --------- analogix_dp_detect:1052
[   11.729596] YKK --------- analogix_dp_get_modes:1016
[   11.737608] rockchip-dp ff970000.edp: 
analogix_dp_read_bytes_from_dpcd: Aux Transaction fail!
[   11.749229] rockchip-dp ff970000.edp: 
analogix_dp_read_bytes_from_dpcd: Aux Transaction fail!
[   11.760799] rockchip-dp ff970000.edp: 
analogix_dp_read_bytes_from_dpcd: Aux Transaction fail!
[   13.315962] YKK --------- analogix_dp_detect:1052
[   13.984702] YKK --------- analogix_dp_get_modes:1016
[   13.992977] rockchip-dp ff970000.edp: 
analogix_dp_read_bytes_from_dpcd: Aux Transaction fail!
[   14.004414] rockchip-dp ff970000.edp: 
analogix_dp_read_bytes_from_dpcd: Aux Transaction fail!
[   14.015842] rockchip-dp ff970000.edp: 
analogix_dp_read_bytes_from_dpcd: Aux Transaction fail!
[   14.183109] YKK --------- analogix_dp_bridge_pre_enable:1147
[   14.306301] rockchip-dp ff970000.edp: Link Training Clock Recovery 
success
[   14.319130] rockchip-dp ff970000.edp: Link Training success!
[   14.326388] rockchip-dp ff970000.edp: wait SYS_CTL_2.
[   14.437247] rockchip-dp ff970000.edp: Timeout of video streamclk ok
[   14.443585] rockchip-dp ff970000.edp: unable to config video


>   }
>   
>   static void analogix_dp_connector_destroy(struct drm_connector *connector)
> @@ -1035,6 +1051,18 @@ static int analogix_dp_bridge_attach(struct drm_bridge *bridge)
>   	return 0;
>   }
>   
> +static void analogix_dp_bridge_pre_enable(struct drm_bridge *bridge)
> +{
> +	struct analogix_dp_device *dp = bridge->driver_private;
> +	int ret;
> +
> +	if (dp->plat_data->panel) {
> +		ret = drm_panel_prepare(dp->plat_data->panel);
> +		if (ret)
> +			DRM_ERROR("failed to setup the panel ret = %d\n", ret);
> +	}

2. Driver would failed to read EDID in some case. Panel would only be 
powered up in bridge->pre_enable() function which later than 
connector->get_modes() function, and this would caused DPCD transfer 
failed in analogix_dp_handle_edid(). This seem won't caused too big 
issue, cause userspace would read EDID again after bridge/encoder is 
enabled. But it's better to avoid this potential bug.


[   11.065267] YKK --------- analogix_dp_detect:1052
[   11.729596] YKK --------- analogix_dp_get_modes:1016
[   11.737608] rockchip-dp ff970000.edp: 
analogix_dp_read_bytes_from_dpcd: Aux Transaction fail!
[   11.749229] rockchip-dp ff970000.edp: 
analogix_dp_read_bytes_from_dpcd: Aux Transaction fail!
[   11.760799] rockchip-dp ff970000.edp: 
analogix_dp_read_bytes_from_dpcd: Aux Transaction fail!
[   13.315962] YKK --------- analogix_dp_detect:1052
[   13.984702] YKK --------- analogix_dp_get_modes:1016
[   13.992977] rockchip-dp ff970000.edp: 
analogix_dp_read_bytes_from_dpcd: Aux Transaction fail!
[   14.004414] rockchip-dp ff970000.edp: 
analogix_dp_read_bytes_from_dpcd: Aux Transaction fail!
[   14.015842] rockchip-dp ff970000.edp: 
analogix_dp_read_bytes_from_dpcd: Aux Transaction fail!
[   14.183109] YKK --------- analogix_dp_bridge_pre_enable:1147
[   14.306301] rockchip-dp ff970000.edp: Link Training Clock Recovery 
success
[   14.319130] rockchip-dp ff970000.edp: Link Training success!
[   14.326388] rockchip-dp ff970000.edp: wait SYS_CTL_2.
[   14.437247] rockchip-dp ff970000.edp: Timeout of video streamclk ok
[   14.443585] rockchip-dp ff970000.edp: unable to config video
[   14.520565] YKK --------- analogix_dp_detect:1052
[   14.525339] YKK --------- analogix_dp_get_modes:1016
[   14.531233] rockchip-dp ff970000.edp: EDID data does not include any 
extensions.
[   15.595724] YKK --------- analogix_dp_detect:1052
[   15.600488] YKK --------- analogix_dp_get_modes:1016
[   15.606451] rockchip-dp ff970000.edp: EDID data does not include any 
extensions.
[   17.327354] YKK --------- analogix_dp_detect:1052
[   17.332105] YKK --------- analogix_dp_get_modes:1016
[   17.338171] rockchip-dp ff970000.edp: EDID data does not include any 
extensions.
[   56.236024] YKK --------- analogix_dp_detect:1052
[   56.240820] YKK --------- analogix_dp_get_modes:1016
[   56.246855] rockchip-dp ff970000.edp: EDID data does not include any 
extensions.
[   64.092477] YKK --------- analogix_dp_detect:1052
[   64.763712] YKK --------- analogix_dp_get_modes:1016



BR,
- Yakir

> +}
> +
>   static void analogix_dp_bridge_enable(struct drm_bridge *bridge)
>   {
>   	struct analogix_dp_device *dp = bridge->driver_private;
> @@ -1058,6 +1086,7 @@ static void analogix_dp_bridge_enable(struct drm_bridge *bridge)
>   static void analogix_dp_bridge_disable(struct drm_bridge *bridge)
>   {
>   	struct analogix_dp_device *dp = bridge->driver_private;
> +	int ret;
>   
>   	if (dp->dpms_mode != DRM_MODE_DPMS_ON)
>   		return;
> @@ -1077,6 +1106,10 @@ static void analogix_dp_bridge_disable(struct drm_bridge *bridge)
>   
>   	pm_runtime_put_sync(dp->dev);
>   
> +	ret = drm_panel_unprepare(dp->plat_data->panel);
> +	if (ret)
> +		DRM_ERROR("failed to setup the panel ret = %d\n", ret);
> +
>   	dp->dpms_mode = DRM_MODE_DPMS_OFF;
>   }
>   
> @@ -1165,9 +1198,9 @@ static void analogix_dp_bridge_nop(struct drm_bridge *bridge)
>   }
>   
>   static const struct drm_bridge_funcs analogix_dp_bridge_funcs = {
> +	.pre_enable = analogix_dp_bridge_pre_enable,
>   	.enable = analogix_dp_bridge_enable,
>   	.disable = analogix_dp_bridge_disable,
> -	.pre_enable = analogix_dp_bridge_nop,
>   	.post_disable = analogix_dp_bridge_nop,
>   	.mode_set = analogix_dp_bridge_mode_set,
>   	.attach = analogix_dp_bridge_attach,
> @@ -1333,13 +1366,6 @@ int analogix_dp_bind(struct device *dev, struct drm_device *drm_dev,
>   
>   	phy_power_on(dp->phy);
>   
> -	if (dp->plat_data->panel) {
> -		if (drm_panel_prepare(dp->plat_data->panel)) {
> -			DRM_ERROR("failed to setup the panel\n");
> -			return -EBUSY;
> -		}
> -	}
> -
>   	analogix_dp_init_dp(dp);
>   
>   	ret = devm_request_threaded_irq(&pdev->dev, dp->irq,

Re: [PATCH] drm/analogix_dp: Ensure the panel is properly prepared/unprepared

[Yakir Yang]

Sean,

On 07/30/2016 03:16 AM, Sean Paul wrote:
> Instead of just preparing the panel on bind, actually prepare/unprepare
> during modeset/disable. The panel must be prepared in order to read hpd
> status, so we need to refcount the prepares in order to ensure we don't
> accidentally turn the panel off at the wrong time.
>
> Signed-off-by: Sean Paul <seanpaul@chromium.org>
> ---
>
>
> Hi Yakir,
> This is what I was talking about upthread. I've tested it and it seems to be working.
>
> What do you think?

Thanks for your patch, and it works. But I have introduced two 
questions, and I haven't found a way to fixed them.

> Sean
>
>
>
> drivers/gpu/drm/bridge/analogix/analogix_dp_core.c | 48 +++++++++++++++++-----
>   1 file changed, 37 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
> index 32715da..7b764a4 100644
> --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
> +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
> @@ -960,11 +960,27 @@ enum drm_connector_status
>   analogix_dp_detect(struct drm_connector *connector, bool force)
>   {
>   	struct analogix_dp_device *dp = to_dp(connector);
> +	enum drm_connector_status status = connector_status_disconnected;
> +	int ret;
>   
> -	if (analogix_dp_detect_hpd(dp))
> -		return connector_status_disconnected;
> +	if (dp->plat_data->panel && dp->dpms_mode != DRM_MODE_DPMS_ON) {
> +		ret = drm_panel_prepare(dp->plat_data->panel);
> +		if (ret) {
> +			DRM_ERROR("failed to setup panel (%d)\n", ret);
> +			return connector_status_disconnected;
> +		}
> +	}
> +
> +	if (!analogix_dp_detect_hpd(dp))
> +		status = connector_status_connected;
> +
> +	if (dp->plat_data->panel && dp->dpms_mode != DRM_MODE_DPMS_ON) {
> +		ret = drm_panel_unprepare(dp->plat_data->panel);
> +		if (ret)
> +			DRM_ERROR("failed to setup the panel ret = %d\n", ret);
> +	}
>   
> -	return connector_status_connected;
> +	return status;

1. Panel would flicker at system boot time. Your patch would flash the 
panel power in connector->detect() function when dp->dpms_mode isn't 
DRM_MODE_DPMS_OFF. So when userspace keep detect the connector status in 
boot time, we could see panel would flicker (light up for a while, and 
turn off again, and keep loop for several time). I have copied some 
kernel logs:


[   11.065267] YKK --------- analogix_dp_detect:1052
[   11.729596] YKK --------- analogix_dp_get_modes:1016
[   11.737608] rockchip-dp ff970000.edp: 
analogix_dp_read_bytes_from_dpcd: Aux Transaction fail!
[   11.749229] rockchip-dp ff970000.edp: 
analogix_dp_read_bytes_from_dpcd: Aux Transaction fail!
[   11.760799] rockchip-dp ff970000.edp: 
analogix_dp_read_bytes_from_dpcd: Aux Transaction fail!
[   13.315962] YKK --------- analogix_dp_detect:1052
[   13.984702] YKK --------- analogix_dp_get_modes:1016
[   13.992977] rockchip-dp ff970000.edp: 
analogix_dp_read_bytes_from_dpcd: Aux Transaction fail!
[   14.004414] rockchip-dp ff970000.edp: 
analogix_dp_read_bytes_from_dpcd: Aux Transaction fail!
[   14.015842] rockchip-dp ff970000.edp: 
analogix_dp_read_bytes_from_dpcd: Aux Transaction fail!
[   14.183109] YKK --------- analogix_dp_bridge_pre_enable:1147
[   14.306301] rockchip-dp ff970000.edp: Link Training Clock Recovery 
success
[   14.319130] rockchip-dp ff970000.edp: Link Training success!
[   14.326388] rockchip-dp ff970000.edp: wait SYS_CTL_2.
[   14.437247] rockchip-dp ff970000.edp: Timeout of video streamclk ok
[   14.443585] rockchip-dp ff970000.edp: unable to config video


>   }
>   
>   static void analogix_dp_connector_destroy(struct drm_connector *connector)
> @@ -1035,6 +1051,18 @@ static int analogix_dp_bridge_attach(struct drm_bridge *bridge)
>   	return 0;
>   }
>   
> +static void analogix_dp_bridge_pre_enable(struct drm_bridge *bridge)
> +{
> +	struct analogix_dp_device *dp = bridge->driver_private;
> +	int ret;
> +
> +	if (dp->plat_data->panel) {
> +		ret = drm_panel_prepare(dp->plat_data->panel);
> +		if (ret)
> +			DRM_ERROR("failed to setup the panel ret = %d\n", ret);
> +	}

2. Driver would failed to read EDID in some case. Panel would only be 
powered up in bridge->pre_enable() function which later than 
connector->get_modes() function, and this would caused DPCD transfer 
failed in analogix_dp_handle_edid(). This seem won't caused too big 
issue, cause userspace would read EDID again after bridge/encoder is 
enabled. But it's better to avoid this potential bug.


[   11.065267] YKK --------- analogix_dp_detect:1052
[   11.729596] YKK --------- analogix_dp_get_modes:1016
[   11.737608] rockchip-dp ff970000.edp: 
analogix_dp_read_bytes_from_dpcd: Aux Transaction fail!
[   11.749229] rockchip-dp ff970000.edp: 
analogix_dp_read_bytes_from_dpcd: Aux Transaction fail!
[   11.760799] rockchip-dp ff970000.edp: 
analogix_dp_read_bytes_from_dpcd: Aux Transaction fail!
[   13.315962] YKK --------- analogix_dp_detect:1052
[   13.984702] YKK --------- analogix_dp_get_modes:1016
[   13.992977] rockchip-dp ff970000.edp: 
analogix_dp_read_bytes_from_dpcd: Aux Transaction fail!
[   14.004414] rockchip-dp ff970000.edp: 
analogix_dp_read_bytes_from_dpcd: Aux Transaction fail!
[   14.015842] rockchip-dp ff970000.edp: 
analogix_dp_read_bytes_from_dpcd: Aux Transaction fail!
[   14.183109] YKK --------- analogix_dp_bridge_pre_enable:1147
[   14.306301] rockchip-dp ff970000.edp: Link Training Clock Recovery 
success
[   14.319130] rockchip-dp ff970000.edp: Link Training success!
[   14.326388] rockchip-dp ff970000.edp: wait SYS_CTL_2.
[   14.437247] rockchip-dp ff970000.edp: Timeout of video streamclk ok
[   14.443585] rockchip-dp ff970000.edp: unable to config video
[   14.520565] YKK --------- analogix_dp_detect:1052
[   14.525339] YKK --------- analogix_dp_get_modes:1016
[   14.531233] rockchip-dp ff970000.edp: EDID data does not include any 
extensions.
[   15.595724] YKK --------- analogix_dp_detect:1052
[   15.600488] YKK --------- analogix_dp_get_modes:1016
[   15.606451] rockchip-dp ff970000.edp: EDID data does not include any 
extensions.
[   17.327354] YKK --------- analogix_dp_detect:1052
[   17.332105] YKK --------- analogix_dp_get_modes:1016
[   17.338171] rockchip-dp ff970000.edp: EDID data does not include any 
extensions.
[   56.236024] YKK --------- analogix_dp_detect:1052
[   56.240820] YKK --------- analogix_dp_get_modes:1016
[   56.246855] rockchip-dp ff970000.edp: EDID data does not include any 
extensions.
[   64.092477] YKK --------- analogix_dp_detect:1052
[   64.763712] YKK --------- analogix_dp_get_modes:1016



BR,
- Yakir

> +}
> +
>   static void analogix_dp_bridge_enable(struct drm_bridge *bridge)
>   {
>   	struct analogix_dp_device *dp = bridge->driver_private;
> @@ -1058,6 +1086,7 @@ static void analogix_dp_bridge_enable(struct drm_bridge *bridge)
>   static void analogix_dp_bridge_disable(struct drm_bridge *bridge)
>   {
>   	struct analogix_dp_device *dp = bridge->driver_private;
> +	int ret;
>   
>   	if (dp->dpms_mode != DRM_MODE_DPMS_ON)
>   		return;
> @@ -1077,6 +1106,10 @@ static void analogix_dp_bridge_disable(struct drm_bridge *bridge)
>   
>   	pm_runtime_put_sync(dp->dev);
>   
> +	ret = drm_panel_unprepare(dp->plat_data->panel);
> +	if (ret)
> +		DRM_ERROR("failed to setup the panel ret = %d\n", ret);
> +
>   	dp->dpms_mode = DRM_MODE_DPMS_OFF;
>   }
>   
> @@ -1165,9 +1198,9 @@ static void analogix_dp_bridge_nop(struct drm_bridge *bridge)
>   }
>   
>   static const struct drm_bridge_funcs analogix_dp_bridge_funcs = {
> +	.pre_enable = analogix_dp_bridge_pre_enable,
>   	.enable = analogix_dp_bridge_enable,
>   	.disable = analogix_dp_bridge_disable,
> -	.pre_enable = analogix_dp_bridge_nop,
>   	.post_disable = analogix_dp_bridge_nop,
>   	.mode_set = analogix_dp_bridge_mode_set,
>   	.attach = analogix_dp_bridge_attach,
> @@ -1333,13 +1366,6 @@ int analogix_dp_bind(struct device *dev, struct drm_device *drm_dev,
>   
>   	phy_power_on(dp->phy);
>   
> -	if (dp->plat_data->panel) {
> -		if (drm_panel_prepare(dp->plat_data->panel)) {
> -			DRM_ERROR("failed to setup the panel\n");
> -			return -EBUSY;
> -		}
> -	}
> -
>   	analogix_dp_init_dp(dp);
>   
>   	ret = devm_request_threaded_irq(&pdev->dev, dp->irq,


_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
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Re: [PATCH] drm/analogix_dp: Ensure the panel is properly prepared/unprepared

[Sean Paul]

On Sun, Jul 31, 2016 at 11:27 PM, Yakir Yang <ykk@rock-chips.com> wrote:
> Sean,
>
> On 07/30/2016 03:16 AM, Sean Paul wrote:
>>
>> Instead of just preparing the panel on bind, actually prepare/unprepare
>> during modeset/disable. The panel must be prepared in order to read hpd
>> status, so we need to refcount the prepares in order to ensure we don't
>> accidentally turn the panel off at the wrong time.
>>
>> Signed-off-by: Sean Paul <seanpaul@chromium.org>
>> ---
>>
>>
>> Hi Yakir,
>> This is what I was talking about upthread. I've tested it and it seems to
>> be working.
>>
>> What do you think?
>
>
> Thanks for your patch, and it works. But I have introduced two questions,
> and I haven't found a way to fixed them.
>
>
>> Sean
>>
>>
>>
>> drivers/gpu/drm/bridge/analogix/analogix_dp_core.c | 48
>> +++++++++++++++++-----
>>   1 file changed, 37 insertions(+), 11 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
>> b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
>> index 32715da..7b764a4 100644
>> --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
>> +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
>> @@ -960,11 +960,27 @@ enum drm_connector_status
>>   analogix_dp_detect(struct drm_connector *connector, bool force)
>>   {
>>         struct analogix_dp_device *dp = to_dp(connector);
>> +       enum drm_connector_status status = connector_status_disconnected;
>> +       int ret;
>>   -     if (analogix_dp_detect_hpd(dp))
>> -               return connector_status_disconnected;
>> +       if (dp->plat_data->panel && dp->dpms_mode != DRM_MODE_DPMS_ON) {
>> +               ret = drm_panel_prepare(dp->plat_data->panel);
>> +               if (ret) {
>> +                       DRM_ERROR("failed to setup panel (%d)\n", ret);
>> +                       return connector_status_disconnected;
>> +               }
>> +       }
>> +
>> +       if (!analogix_dp_detect_hpd(dp))
>> +               status = connector_status_connected;
>> +
>> +       if (dp->plat_data->panel && dp->dpms_mode != DRM_MODE_DPMS_ON) {
>> +               ret = drm_panel_unprepare(dp->plat_data->panel);
>> +               if (ret)
>> +                       DRM_ERROR("failed to setup the panel ret = %d\n",
>> ret);
>> +       }
>>   -     return connector_status_connected;
>> +       return status;
>
>
> 1. Panel would flicker at system boot time. Your patch would flash the panel
> power in connector->detect() function when dp->dpms_mode isn't
> DRM_MODE_DPMS_OFF. So when userspace keep detect the connector status in
> boot time, we could see panel would flicker (light up for a while, and turn
> off again, and keep loop for several time). I have copied some kernel logs:
>


Hmm, yeah, the backlight does seem to flash. It seems like backlight
shouldn't be on if the panel isn't enabled. this would also fix the
issue below since you could add panel prepare/unprepare in get_modes.

Alternatively, have you played around with moving things around in
prepare/unprepare? Perhaps just enabling the supply regulator (without
the enable gpio set) is sufficient to read HPD/EDID, but will still
prevent the original backlight flicker/burn-in issue?

Sean



>
> [   11.065267] YKK --------- analogix_dp_detect:1052
> [   11.729596] YKK --------- analogix_dp_get_modes:1016
> [   11.737608] rockchip-dp ff970000.edp: analogix_dp_read_bytes_from_dpcd:
> Aux Transaction fail!
> [   11.749229] rockchip-dp ff970000.edp: analogix_dp_read_bytes_from_dpcd:
> Aux Transaction fail!
> [   11.760799] rockchip-dp ff970000.edp: analogix_dp_read_bytes_from_dpcd:
> Aux Transaction fail!
> [   13.315962] YKK --------- analogix_dp_detect:1052
> [   13.984702] YKK --------- analogix_dp_get_modes:1016
> [   13.992977] rockchip-dp ff970000.edp: analogix_dp_read_bytes_from_dpcd:
> Aux Transaction fail!
> [   14.004414] rockchip-dp ff970000.edp: analogix_dp_read_bytes_from_dpcd:
> Aux Transaction fail!
> [   14.015842] rockchip-dp ff970000.edp: analogix_dp_read_bytes_from_dpcd:
> Aux Transaction fail!
> [   14.183109] YKK --------- analogix_dp_bridge_pre_enable:1147
> [   14.306301] rockchip-dp ff970000.edp: Link Training Clock Recovery
> success
> [   14.319130] rockchip-dp ff970000.edp: Link Training success!
> [   14.326388] rockchip-dp ff970000.edp: wait SYS_CTL_2.
> [   14.437247] rockchip-dp ff970000.edp: Timeout of video streamclk ok
> [   14.443585] rockchip-dp ff970000.edp: unable to config video
>
>
>>   }
>>     static void analogix_dp_connector_destroy(struct drm_connector
>> *connector)
>> @@ -1035,6 +1051,18 @@ static int analogix_dp_bridge_attach(struct
>> drm_bridge *bridge)
>>         return 0;
>>   }
>>   +static void analogix_dp_bridge_pre_enable(struct drm_bridge *bridge)
>> +{
>> +       struct analogix_dp_device *dp = bridge->driver_private;
>> +       int ret;
>> +
>> +       if (dp->plat_data->panel) {
>> +               ret = drm_panel_prepare(dp->plat_data->panel);
>> +               if (ret)
>> +                       DRM_ERROR("failed to setup the panel ret = %d\n",
>> ret);
>> +       }
>
>
> 2. Driver would failed to read EDID in some case. Panel would only be
> powered up in bridge->pre_enable() function which later than
> connector->get_modes() function, and this would caused DPCD transfer failed
> in analogix_dp_handle_edid(). This seem won't caused too big issue, cause
> userspace would read EDID again after bridge/encoder is enabled. But it's
> better to avoid this potential bug.
>
>
> [   11.065267] YKK --------- analogix_dp_detect:1052
> [   11.729596] YKK --------- analogix_dp_get_modes:1016
> [   11.737608] rockchip-dp ff970000.edp: analogix_dp_read_bytes_from_dpcd:
> Aux Transaction fail!
> [   11.749229] rockchip-dp ff970000.edp: analogix_dp_read_bytes_from_dpcd:
> Aux Transaction fail!
> [   11.760799] rockchip-dp ff970000.edp: analogix_dp_read_bytes_from_dpcd:
> Aux Transaction fail!
> [   13.315962] YKK --------- analogix_dp_detect:1052
> [   13.984702] YKK --------- analogix_dp_get_modes:1016
> [   13.992977] rockchip-dp ff970000.edp: analogix_dp_read_bytes_from_dpcd:
> Aux Transaction fail!
> [   14.004414] rockchip-dp ff970000.edp: analogix_dp_read_bytes_from_dpcd:
> Aux Transaction fail!
> [   14.015842] rockchip-dp ff970000.edp: analogix_dp_read_bytes_from_dpcd:
> Aux Transaction fail!
> [   14.183109] YKK --------- analogix_dp_bridge_pre_enable:1147
> [   14.306301] rockchip-dp ff970000.edp: Link Training Clock Recovery
> success
> [   14.319130] rockchip-dp ff970000.edp: Link Training success!
> [   14.326388] rockchip-dp ff970000.edp: wait SYS_CTL_2.
> [   14.437247] rockchip-dp ff970000.edp: Timeout of video streamclk ok
> [   14.443585] rockchip-dp ff970000.edp: unable to config video
> [   14.520565] YKK --------- analogix_dp_detect:1052
> [   14.525339] YKK --------- analogix_dp_get_modes:1016
> [   14.531233] rockchip-dp ff970000.edp: EDID data does not include any
> extensions.
> [   15.595724] YKK --------- analogix_dp_detect:1052
> [   15.600488] YKK --------- analogix_dp_get_modes:1016
> [   15.606451] rockchip-dp ff970000.edp: EDID data does not include any
> extensions.
> [   17.327354] YKK --------- analogix_dp_detect:1052
> [   17.332105] YKK --------- analogix_dp_get_modes:1016
> [   17.338171] rockchip-dp ff970000.edp: EDID data does not include any
> extensions.
> [   56.236024] YKK --------- analogix_dp_detect:1052
> [   56.240820] YKK --------- analogix_dp_get_modes:1016
> [   56.246855] rockchip-dp ff970000.edp: EDID data does not include any
> extensions.
> [   64.092477] YKK --------- analogix_dp_detect:1052
> [   64.763712] YKK --------- analogix_dp_get_modes:1016
>
>
>
> BR,
> - Yakir
>
>
>> +}
>> +
>>   static void analogix_dp_bridge_enable(struct drm_bridge *bridge)
>>   {
>>         struct analogix_dp_device *dp = bridge->driver_private;
>> @@ -1058,6 +1086,7 @@ static void analogix_dp_bridge_enable(struct
>> drm_bridge *bridge)
>>   static void analogix_dp_bridge_disable(struct drm_bridge *bridge)
>>   {
>>         struct analogix_dp_device *dp = bridge->driver_private;
>> +       int ret;
>>         if (dp->dpms_mode != DRM_MODE_DPMS_ON)
>>                 return;
>> @@ -1077,6 +1106,10 @@ static void analogix_dp_bridge_disable(struct
>> drm_bridge *bridge)
>>         pm_runtime_put_sync(dp->dev);
>>   +     ret = drm_panel_unprepare(dp->plat_data->panel);
>> +       if (ret)
>> +               DRM_ERROR("failed to setup the panel ret = %d\n", ret);
>> +
>>         dp->dpms_mode = DRM_MODE_DPMS_OFF;
>>   }
>>   @@ -1165,9 +1198,9 @@ static void analogix_dp_bridge_nop(struct
>> drm_bridge *bridge)
>>   }
>>     static const struct drm_bridge_funcs analogix_dp_bridge_funcs = {
>> +       .pre_enable = analogix_dp_bridge_pre_enable,
>>         .enable = analogix_dp_bridge_enable,
>>         .disable = analogix_dp_bridge_disable,
>> -       .pre_enable = analogix_dp_bridge_nop,
>>         .post_disable = analogix_dp_bridge_nop,
>>         .mode_set = analogix_dp_bridge_mode_set,
>>         .attach = analogix_dp_bridge_attach,
>> @@ -1333,13 +1366,6 @@ int analogix_dp_bind(struct device *dev, struct
>> drm_device *drm_dev,
>>         phy_power_on(dp->phy);
>>   -     if (dp->plat_data->panel) {
>> -               if (drm_panel_prepare(dp->plat_data->panel)) {
>> -                       DRM_ERROR("failed to setup the panel\n");
>> -                       return -EBUSY;
>> -               }
>> -       }
>> -
>>         analogix_dp_init_dp(dp);
>>         ret = devm_request_threaded_irq(&pdev->dev, dp->irq,
>
>
>
> --
> To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc"
> in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html

Re: [PATCH] drm/analogix_dp: Ensure the panel is properly prepared/unprepared

[Sean Paul]

On Sun, Jul 31, 2016 at 11:27 PM, Yakir Yang <ykk@rock-chips.com> wrote:
> Sean,
>
> On 07/30/2016 03:16 AM, Sean Paul wrote:
>>
>> Instead of just preparing the panel on bind, actually prepare/unprepare
>> during modeset/disable. The panel must be prepared in order to read hpd
>> status, so we need to refcount the prepares in order to ensure we don't
>> accidentally turn the panel off at the wrong time.
>>
>> Signed-off-by: Sean Paul <seanpaul@chromium.org>
>> ---
>>
>>
>> Hi Yakir,
>> This is what I was talking about upthread. I've tested it and it seems to
>> be working.
>>
>> What do you think?
>
>
> Thanks for your patch, and it works. But I have introduced two questions,
> and I haven't found a way to fixed them.
>
>
>> Sean
>>
>>
>>
>> drivers/gpu/drm/bridge/analogix/analogix_dp_core.c | 48
>> +++++++++++++++++-----
>>   1 file changed, 37 insertions(+), 11 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
>> b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
>> index 32715da..7b764a4 100644
>> --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
>> +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
>> @@ -960,11 +960,27 @@ enum drm_connector_status
>>   analogix_dp_detect(struct drm_connector *connector, bool force)
>>   {
>>         struct analogix_dp_device *dp = to_dp(connector);
>> +       enum drm_connector_status status = connector_status_disconnected;
>> +       int ret;
>>   -     if (analogix_dp_detect_hpd(dp))
>> -               return connector_status_disconnected;
>> +       if (dp->plat_data->panel && dp->dpms_mode != DRM_MODE_DPMS_ON) {
>> +               ret = drm_panel_prepare(dp->plat_data->panel);
>> +               if (ret) {
>> +                       DRM_ERROR("failed to setup panel (%d)\n", ret);
>> +                       return connector_status_disconnected;
>> +               }
>> +       }
>> +
>> +       if (!analogix_dp_detect_hpd(dp))
>> +               status = connector_status_connected;
>> +
>> +       if (dp->plat_data->panel && dp->dpms_mode != DRM_MODE_DPMS_ON) {
>> +               ret = drm_panel_unprepare(dp->plat_data->panel);
>> +               if (ret)
>> +                       DRM_ERROR("failed to setup the panel ret = %d\n",
>> ret);
>> +       }
>>   -     return connector_status_connected;
>> +       return status;
>
>
> 1. Panel would flicker at system boot time. Your patch would flash the panel
> power in connector->detect() function when dp->dpms_mode isn't
> DRM_MODE_DPMS_OFF. So when userspace keep detect the connector status in
> boot time, we could see panel would flicker (light up for a while, and turn
> off again, and keep loop for several time). I have copied some kernel logs:
>


Hmm, yeah, the backlight does seem to flash. It seems like backlight
shouldn't be on if the panel isn't enabled. this would also fix the
issue below since you could add panel prepare/unprepare in get_modes.

Alternatively, have you played around with moving things around in
prepare/unprepare? Perhaps just enabling the supply regulator (without
the enable gpio set) is sufficient to read HPD/EDID, but will still
prevent the original backlight flicker/burn-in issue?

Sean



>
> [   11.065267] YKK --------- analogix_dp_detect:1052
> [   11.729596] YKK --------- analogix_dp_get_modes:1016
> [   11.737608] rockchip-dp ff970000.edp: analogix_dp_read_bytes_from_dpcd:
> Aux Transaction fail!
> [   11.749229] rockchip-dp ff970000.edp: analogix_dp_read_bytes_from_dpcd:
> Aux Transaction fail!
> [   11.760799] rockchip-dp ff970000.edp: analogix_dp_read_bytes_from_dpcd:
> Aux Transaction fail!
> [   13.315962] YKK --------- analogix_dp_detect:1052
> [   13.984702] YKK --------- analogix_dp_get_modes:1016
> [   13.992977] rockchip-dp ff970000.edp: analogix_dp_read_bytes_from_dpcd:
> Aux Transaction fail!
> [   14.004414] rockchip-dp ff970000.edp: analogix_dp_read_bytes_from_dpcd:
> Aux Transaction fail!
> [   14.015842] rockchip-dp ff970000.edp: analogix_dp_read_bytes_from_dpcd:
> Aux Transaction fail!
> [   14.183109] YKK --------- analogix_dp_bridge_pre_enable:1147
> [   14.306301] rockchip-dp ff970000.edp: Link Training Clock Recovery
> success
> [   14.319130] rockchip-dp ff970000.edp: Link Training success!
> [   14.326388] rockchip-dp ff970000.edp: wait SYS_CTL_2.
> [   14.437247] rockchip-dp ff970000.edp: Timeout of video streamclk ok
> [   14.443585] rockchip-dp ff970000.edp: unable to config video
>
>
>>   }
>>     static void analogix_dp_connector_destroy(struct drm_connector
>> *connector)
>> @@ -1035,6 +1051,18 @@ static int analogix_dp_bridge_attach(struct
>> drm_bridge *bridge)
>>         return 0;
>>   }
>>   +static void analogix_dp_bridge_pre_enable(struct drm_bridge *bridge)
>> +{
>> +       struct analogix_dp_device *dp = bridge->driver_private;
>> +       int ret;
>> +
>> +       if (dp->plat_data->panel) {
>> +               ret = drm_panel_prepare(dp->plat_data->panel);
>> +               if (ret)
>> +                       DRM_ERROR("failed to setup the panel ret = %d\n",
>> ret);
>> +       }
>
>
> 2. Driver would failed to read EDID in some case. Panel would only be
> powered up in bridge->pre_enable() function which later than
> connector->get_modes() function, and this would caused DPCD transfer failed
> in analogix_dp_handle_edid(). This seem won't caused too big issue, cause
> userspace would read EDID again after bridge/encoder is enabled. But it's
> better to avoid this potential bug.
>
>
> [   11.065267] YKK --------- analogix_dp_detect:1052
> [   11.729596] YKK --------- analogix_dp_get_modes:1016
> [   11.737608] rockchip-dp ff970000.edp: analogix_dp_read_bytes_from_dpcd:
> Aux Transaction fail!
> [   11.749229] rockchip-dp ff970000.edp: analogix_dp_read_bytes_from_dpcd:
> Aux Transaction fail!
> [   11.760799] rockchip-dp ff970000.edp: analogix_dp_read_bytes_from_dpcd:
> Aux Transaction fail!
> [   13.315962] YKK --------- analogix_dp_detect:1052
> [   13.984702] YKK --------- analogix_dp_get_modes:1016
> [   13.992977] rockchip-dp ff970000.edp: analogix_dp_read_bytes_from_dpcd:
> Aux Transaction fail!
> [   14.004414] rockchip-dp ff970000.edp: analogix_dp_read_bytes_from_dpcd:
> Aux Transaction fail!
> [   14.015842] rockchip-dp ff970000.edp: analogix_dp_read_bytes_from_dpcd:
> Aux Transaction fail!
> [   14.183109] YKK --------- analogix_dp_bridge_pre_enable:1147
> [   14.306301] rockchip-dp ff970000.edp: Link Training Clock Recovery
> success
> [   14.319130] rockchip-dp ff970000.edp: Link Training success!
> [   14.326388] rockchip-dp ff970000.edp: wait SYS_CTL_2.
> [   14.437247] rockchip-dp ff970000.edp: Timeout of video streamclk ok
> [   14.443585] rockchip-dp ff970000.edp: unable to config video
> [   14.520565] YKK --------- analogix_dp_detect:1052
> [   14.525339] YKK --------- analogix_dp_get_modes:1016
> [   14.531233] rockchip-dp ff970000.edp: EDID data does not include any
> extensions.
> [   15.595724] YKK --------- analogix_dp_detect:1052
> [   15.600488] YKK --------- analogix_dp_get_modes:1016
> [   15.606451] rockchip-dp ff970000.edp: EDID data does not include any
> extensions.
> [   17.327354] YKK --------- analogix_dp_detect:1052
> [   17.332105] YKK --------- analogix_dp_get_modes:1016
> [   17.338171] rockchip-dp ff970000.edp: EDID data does not include any
> extensions.
> [   56.236024] YKK --------- analogix_dp_detect:1052
> [   56.240820] YKK --------- analogix_dp_get_modes:1016
> [   56.246855] rockchip-dp ff970000.edp: EDID data does not include any
> extensions.
> [   64.092477] YKK --------- analogix_dp_detect:1052
> [   64.763712] YKK --------- analogix_dp_get_modes:1016
>
>
>
> BR,
> - Yakir
>
>
>> +}
>> +
>>   static void analogix_dp_bridge_enable(struct drm_bridge *bridge)
>>   {
>>         struct analogix_dp_device *dp = bridge->driver_private;
>> @@ -1058,6 +1086,7 @@ static void analogix_dp_bridge_enable(struct
>> drm_bridge *bridge)
>>   static void analogix_dp_bridge_disable(struct drm_bridge *bridge)
>>   {
>>         struct analogix_dp_device *dp = bridge->driver_private;
>> +       int ret;
>>         if (dp->dpms_mode != DRM_MODE_DPMS_ON)
>>                 return;
>> @@ -1077,6 +1106,10 @@ static void analogix_dp_bridge_disable(struct
>> drm_bridge *bridge)
>>         pm_runtime_put_sync(dp->dev);
>>   +     ret = drm_panel_unprepare(dp->plat_data->panel);
>> +       if (ret)
>> +               DRM_ERROR("failed to setup the panel ret = %d\n", ret);
>> +
>>         dp->dpms_mode = DRM_MODE_DPMS_OFF;
>>   }
>>   @@ -1165,9 +1198,9 @@ static void analogix_dp_bridge_nop(struct
>> drm_bridge *bridge)
>>   }
>>     static const struct drm_bridge_funcs analogix_dp_bridge_funcs = {
>> +       .pre_enable = analogix_dp_bridge_pre_enable,
>>         .enable = analogix_dp_bridge_enable,
>>         .disable = analogix_dp_bridge_disable,
>> -       .pre_enable = analogix_dp_bridge_nop,
>>         .post_disable = analogix_dp_bridge_nop,
>>         .mode_set = analogix_dp_bridge_mode_set,
>>         .attach = analogix_dp_bridge_attach,
>> @@ -1333,13 +1366,6 @@ int analogix_dp_bind(struct device *dev, struct
>> drm_device *drm_dev,
>>         phy_power_on(dp->phy);
>>   -     if (dp->plat_data->panel) {
>> -               if (drm_panel_prepare(dp->plat_data->panel)) {
>> -                       DRM_ERROR("failed to setup the panel\n");
>> -                       return -EBUSY;
>> -               }
>> -       }
>> -
>>         analogix_dp_init_dp(dp);
>>         ret = devm_request_threaded_irq(&pdev->dev, dp->irq,
>
>
>
> --
> To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc"
> in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel

Re: [PATCH] drm/analogix_dp: Ensure the panel is properly prepared/unprepared

[Sean Paul]

On Mon, Aug 1, 2016 at 4:20 PM, Sean Paul <seanpaul@chromium.org> wrote:
> On Sun, Jul 31, 2016 at 11:27 PM, Yakir Yang <ykk@rock-chips.com> wrote:
>> Sean,
>>
>> On 07/30/2016 03:16 AM, Sean Paul wrote:
>>>
>>> Instead of just preparing the panel on bind, actually prepare/unprepare
>>> during modeset/disable. The panel must be prepared in order to read hpd
>>> status, so we need to refcount the prepares in order to ensure we don't
>>> accidentally turn the panel off at the wrong time.
>>>
>>> Signed-off-by: Sean Paul <seanpaul@chromium.org>
>>> ---
>>>
>>>
>>> Hi Yakir,
>>> This is what I was talking about upthread. I've tested it and it seems to
>>> be working.
>>>
>>> What do you think?
>>
>>
>> Thanks for your patch, and it works. But I have introduced two questions,
>> and I haven't found a way to fixed them.
>>
>>
>>> Sean
>>>
>>>
>>>
>>> drivers/gpu/drm/bridge/analogix/analogix_dp_core.c | 48
>>> +++++++++++++++++-----
>>>   1 file changed, 37 insertions(+), 11 deletions(-)
>>>
>>> diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
>>> b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
>>> index 32715da..7b764a4 100644
>>> --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
>>> +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
>>> @@ -960,11 +960,27 @@ enum drm_connector_status
>>>   analogix_dp_detect(struct drm_connector *connector, bool force)
>>>   {
>>>         struct analogix_dp_device *dp = to_dp(connector);
>>> +       enum drm_connector_status status = connector_status_disconnected;
>>> +       int ret;
>>>   -     if (analogix_dp_detect_hpd(dp))
>>> -               return connector_status_disconnected;
>>> +       if (dp->plat_data->panel && dp->dpms_mode != DRM_MODE_DPMS_ON) {
>>> +               ret = drm_panel_prepare(dp->plat_data->panel);
>>> +               if (ret) {
>>> +                       DRM_ERROR("failed to setup panel (%d)\n", ret);
>>> +                       return connector_status_disconnected;
>>> +               }
>>> +       }
>>> +
>>> +       if (!analogix_dp_detect_hpd(dp))
>>> +               status = connector_status_connected;
>>> +
>>> +       if (dp->plat_data->panel && dp->dpms_mode != DRM_MODE_DPMS_ON) {
>>> +               ret = drm_panel_unprepare(dp->plat_data->panel);
>>> +               if (ret)
>>> +                       DRM_ERROR("failed to setup the panel ret = %d\n",
>>> ret);
>>> +       }
>>>   -     return connector_status_connected;
>>> +       return status;
>>
>>
>> 1. Panel would flicker at system boot time. Your patch would flash the panel
>> power in connector->detect() function when dp->dpms_mode isn't
>> DRM_MODE_DPMS_OFF. So when userspace keep detect the connector status in
>> boot time, we could see panel would flicker (light up for a while, and turn
>> off again, and keep loop for several time). I have copied some kernel logs:
>>
>
>
> Hmm, yeah, the backlight does seem to flash. It seems like backlight
> shouldn't be on if the panel isn't enabled. this would also fix the
> issue below since you could add panel prepare/unprepare in get_modes.
>
> Alternatively, have you played around with moving things around in
> prepare/unprepare? Perhaps just enabling the supply regulator (without
> the enable gpio set) is sufficient to read HPD/EDID, but will still
> prevent the original backlight flicker/burn-in issue?
>

To answer my own question, the enable_gpio isn't populated in the dts,
so reordering things in prepare isn't feasible.

Sean


> Sean
>
>
>
>>
>> [   11.065267] YKK --------- analogix_dp_detect:1052
>> [   11.729596] YKK --------- analogix_dp_get_modes:1016
>> [   11.737608] rockchip-dp ff970000.edp: analogix_dp_read_bytes_from_dpcd:
>> Aux Transaction fail!
>> [   11.749229] rockchip-dp ff970000.edp: analogix_dp_read_bytes_from_dpcd:
>> Aux Transaction fail!
>> [   11.760799] rockchip-dp ff970000.edp: analogix_dp_read_bytes_from_dpcd:
>> Aux Transaction fail!
>> [   13.315962] YKK --------- analogix_dp_detect:1052
>> [   13.984702] YKK --------- analogix_dp_get_modes:1016
>> [   13.992977] rockchip-dp ff970000.edp: analogix_dp_read_bytes_from_dpcd:
>> Aux Transaction fail!
>> [   14.004414] rockchip-dp ff970000.edp: analogix_dp_read_bytes_from_dpcd:
>> Aux Transaction fail!
>> [   14.015842] rockchip-dp ff970000.edp: analogix_dp_read_bytes_from_dpcd:
>> Aux Transaction fail!
>> [   14.183109] YKK --------- analogix_dp_bridge_pre_enable:1147
>> [   14.306301] rockchip-dp ff970000.edp: Link Training Clock Recovery
>> success
>> [   14.319130] rockchip-dp ff970000.edp: Link Training success!
>> [   14.326388] rockchip-dp ff970000.edp: wait SYS_CTL_2.
>> [   14.437247] rockchip-dp ff970000.edp: Timeout of video streamclk ok
>> [   14.443585] rockchip-dp ff970000.edp: unable to config video
>>
>>
>>>   }
>>>     static void analogix_dp_connector_destroy(struct drm_connector
>>> *connector)
>>> @@ -1035,6 +1051,18 @@ static int analogix_dp_bridge_attach(struct
>>> drm_bridge *bridge)
>>>         return 0;
>>>   }
>>>   +static void analogix_dp_bridge_pre_enable(struct drm_bridge *bridge)
>>> +{
>>> +       struct analogix_dp_device *dp = bridge->driver_private;
>>> +       int ret;
>>> +
>>> +       if (dp->plat_data->panel) {
>>> +               ret = drm_panel_prepare(dp->plat_data->panel);
>>> +               if (ret)
>>> +                       DRM_ERROR("failed to setup the panel ret = %d\n",
>>> ret);
>>> +       }
>>
>>
>> 2. Driver would failed to read EDID in some case. Panel would only be
>> powered up in bridge->pre_enable() function which later than
>> connector->get_modes() function, and this would caused DPCD transfer failed
>> in analogix_dp_handle_edid(). This seem won't caused too big issue, cause
>> userspace would read EDID again after bridge/encoder is enabled. But it's
>> better to avoid this potential bug.
>>
>>
>> [   11.065267] YKK --------- analogix_dp_detect:1052
>> [   11.729596] YKK --------- analogix_dp_get_modes:1016
>> [   11.737608] rockchip-dp ff970000.edp: analogix_dp_read_bytes_from_dpcd:
>> Aux Transaction fail!
>> [   11.749229] rockchip-dp ff970000.edp: analogix_dp_read_bytes_from_dpcd:
>> Aux Transaction fail!
>> [   11.760799] rockchip-dp ff970000.edp: analogix_dp_read_bytes_from_dpcd:
>> Aux Transaction fail!
>> [   13.315962] YKK --------- analogix_dp_detect:1052
>> [   13.984702] YKK --------- analogix_dp_get_modes:1016
>> [   13.992977] rockchip-dp ff970000.edp: analogix_dp_read_bytes_from_dpcd:
>> Aux Transaction fail!
>> [   14.004414] rockchip-dp ff970000.edp: analogix_dp_read_bytes_from_dpcd:
>> Aux Transaction fail!
>> [   14.015842] rockchip-dp ff970000.edp: analogix_dp_read_bytes_from_dpcd:
>> Aux Transaction fail!
>> [   14.183109] YKK --------- analogix_dp_bridge_pre_enable:1147
>> [   14.306301] rockchip-dp ff970000.edp: Link Training Clock Recovery
>> success
>> [   14.319130] rockchip-dp ff970000.edp: Link Training success!
>> [   14.326388] rockchip-dp ff970000.edp: wait SYS_CTL_2.
>> [   14.437247] rockchip-dp ff970000.edp: Timeout of video streamclk ok
>> [   14.443585] rockchip-dp ff970000.edp: unable to config video
>> [   14.520565] YKK --------- analogix_dp_detect:1052
>> [   14.525339] YKK --------- analogix_dp_get_modes:1016
>> [   14.531233] rockchip-dp ff970000.edp: EDID data does not include any
>> extensions.
>> [   15.595724] YKK --------- analogix_dp_detect:1052
>> [   15.600488] YKK --------- analogix_dp_get_modes:1016
>> [   15.606451] rockchip-dp ff970000.edp: EDID data does not include any
>> extensions.
>> [   17.327354] YKK --------- analogix_dp_detect:1052
>> [   17.332105] YKK --------- analogix_dp_get_modes:1016
>> [   17.338171] rockchip-dp ff970000.edp: EDID data does not include any
>> extensions.
>> [   56.236024] YKK --------- analogix_dp_detect:1052
>> [   56.240820] YKK --------- analogix_dp_get_modes:1016
>> [   56.246855] rockchip-dp ff970000.edp: EDID data does not include any
>> extensions.
>> [   64.092477] YKK --------- analogix_dp_detect:1052
>> [   64.763712] YKK --------- analogix_dp_get_modes:1016
>>
>>
>>
>> BR,
>> - Yakir
>>
>>
>>> +}
>>> +
>>>   static void analogix_dp_bridge_enable(struct drm_bridge *bridge)
>>>   {
>>>         struct analogix_dp_device *dp = bridge->driver_private;
>>> @@ -1058,6 +1086,7 @@ static void analogix_dp_bridge_enable(struct
>>> drm_bridge *bridge)
>>>   static void analogix_dp_bridge_disable(struct drm_bridge *bridge)
>>>   {
>>>         struct analogix_dp_device *dp = bridge->driver_private;
>>> +       int ret;
>>>         if (dp->dpms_mode != DRM_MODE_DPMS_ON)
>>>                 return;
>>> @@ -1077,6 +1106,10 @@ static void analogix_dp_bridge_disable(struct
>>> drm_bridge *bridge)
>>>         pm_runtime_put_sync(dp->dev);
>>>   +     ret = drm_panel_unprepare(dp->plat_data->panel);
>>> +       if (ret)
>>> +               DRM_ERROR("failed to setup the panel ret = %d\n", ret);
>>> +
>>>         dp->dpms_mode = DRM_MODE_DPMS_OFF;
>>>   }
>>>   @@ -1165,9 +1198,9 @@ static void analogix_dp_bridge_nop(struct
>>> drm_bridge *bridge)
>>>   }
>>>     static const struct drm_bridge_funcs analogix_dp_bridge_funcs = {
>>> +       .pre_enable = analogix_dp_bridge_pre_enable,
>>>         .enable = analogix_dp_bridge_enable,
>>>         .disable = analogix_dp_bridge_disable,
>>> -       .pre_enable = analogix_dp_bridge_nop,
>>>         .post_disable = analogix_dp_bridge_nop,
>>>         .mode_set = analogix_dp_bridge_mode_set,
>>>         .attach = analogix_dp_bridge_attach,
>>> @@ -1333,13 +1366,6 @@ int analogix_dp_bind(struct device *dev, struct
>>> drm_device *drm_dev,
>>>         phy_power_on(dp->phy);
>>>   -     if (dp->plat_data->panel) {
>>> -               if (drm_panel_prepare(dp->plat_data->panel)) {
>>> -                       DRM_ERROR("failed to setup the panel\n");
>>> -                       return -EBUSY;
>>> -               }
>>> -       }
>>> -
>>>         analogix_dp_init_dp(dp);
>>>         ret = devm_request_threaded_irq(&pdev->dev, dp->irq,
>>
>>
>>
>> --
>> To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc"
>> in
>> the body of a message to majordomo@vger.kernel.org
>> More majordomo info at  http://vger.kernel.org/majordomo-info.html

Re: [PATCH] drm/analogix_dp: Ensure the panel is properly prepared/unprepared

[Sean Paul]

On Mon, Aug 1, 2016 at 4:20 PM, Sean Paul <seanpaul@chromium.org> wrote:
> On Sun, Jul 31, 2016 at 11:27 PM, Yakir Yang <ykk@rock-chips.com> wrote:
>> Sean,
>>
>> On 07/30/2016 03:16 AM, Sean Paul wrote:
>>>
>>> Instead of just preparing the panel on bind, actually prepare/unprepare
>>> during modeset/disable. The panel must be prepared in order to read hpd
>>> status, so we need to refcount the prepares in order to ensure we don't
>>> accidentally turn the panel off at the wrong time.
>>>
>>> Signed-off-by: Sean Paul <seanpaul@chromium.org>
>>> ---
>>>
>>>
>>> Hi Yakir,
>>> This is what I was talking about upthread. I've tested it and it seems to
>>> be working.
>>>
>>> What do you think?
>>
>>
>> Thanks for your patch, and it works. But I have introduced two questions,
>> and I haven't found a way to fixed them.
>>
>>
>>> Sean
>>>
>>>
>>>
>>> drivers/gpu/drm/bridge/analogix/analogix_dp_core.c | 48
>>> +++++++++++++++++-----
>>>   1 file changed, 37 insertions(+), 11 deletions(-)
>>>
>>> diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
>>> b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
>>> index 32715da..7b764a4 100644
>>> --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
>>> +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
>>> @@ -960,11 +960,27 @@ enum drm_connector_status
>>>   analogix_dp_detect(struct drm_connector *connector, bool force)
>>>   {
>>>         struct analogix_dp_device *dp = to_dp(connector);
>>> +       enum drm_connector_status status = connector_status_disconnected;
>>> +       int ret;
>>>   -     if (analogix_dp_detect_hpd(dp))
>>> -               return connector_status_disconnected;
>>> +       if (dp->plat_data->panel && dp->dpms_mode != DRM_MODE_DPMS_ON) {
>>> +               ret = drm_panel_prepare(dp->plat_data->panel);
>>> +               if (ret) {
>>> +                       DRM_ERROR("failed to setup panel (%d)\n", ret);
>>> +                       return connector_status_disconnected;
>>> +               }
>>> +       }
>>> +
>>> +       if (!analogix_dp_detect_hpd(dp))
>>> +               status = connector_status_connected;
>>> +
>>> +       if (dp->plat_data->panel && dp->dpms_mode != DRM_MODE_DPMS_ON) {
>>> +               ret = drm_panel_unprepare(dp->plat_data->panel);
>>> +               if (ret)
>>> +                       DRM_ERROR("failed to setup the panel ret = %d\n",
>>> ret);
>>> +       }
>>>   -     return connector_status_connected;
>>> +       return status;
>>
>>
>> 1. Panel would flicker at system boot time. Your patch would flash the panel
>> power in connector->detect() function when dp->dpms_mode isn't
>> DRM_MODE_DPMS_OFF. So when userspace keep detect the connector status in
>> boot time, we could see panel would flicker (light up for a while, and turn
>> off again, and keep loop for several time). I have copied some kernel logs:
>>
>
>
> Hmm, yeah, the backlight does seem to flash. It seems like backlight
> shouldn't be on if the panel isn't enabled. this would also fix the
> issue below since you could add panel prepare/unprepare in get_modes.
>
> Alternatively, have you played around with moving things around in
> prepare/unprepare? Perhaps just enabling the supply regulator (without
> the enable gpio set) is sufficient to read HPD/EDID, but will still
> prevent the original backlight flicker/burn-in issue?
>

To answer my own question, the enable_gpio isn't populated in the dts,
so reordering things in prepare isn't feasible.

Sean


> Sean
>
>
>
>>
>> [   11.065267] YKK --------- analogix_dp_detect:1052
>> [   11.729596] YKK --------- analogix_dp_get_modes:1016
>> [   11.737608] rockchip-dp ff970000.edp: analogix_dp_read_bytes_from_dpcd:
>> Aux Transaction fail!
>> [   11.749229] rockchip-dp ff970000.edp: analogix_dp_read_bytes_from_dpcd:
>> Aux Transaction fail!
>> [   11.760799] rockchip-dp ff970000.edp: analogix_dp_read_bytes_from_dpcd:
>> Aux Transaction fail!
>> [   13.315962] YKK --------- analogix_dp_detect:1052
>> [   13.984702] YKK --------- analogix_dp_get_modes:1016
>> [   13.992977] rockchip-dp ff970000.edp: analogix_dp_read_bytes_from_dpcd:
>> Aux Transaction fail!
>> [   14.004414] rockchip-dp ff970000.edp: analogix_dp_read_bytes_from_dpcd:
>> Aux Transaction fail!
>> [   14.015842] rockchip-dp ff970000.edp: analogix_dp_read_bytes_from_dpcd:
>> Aux Transaction fail!
>> [   14.183109] YKK --------- analogix_dp_bridge_pre_enable:1147
>> [   14.306301] rockchip-dp ff970000.edp: Link Training Clock Recovery
>> success
>> [   14.319130] rockchip-dp ff970000.edp: Link Training success!
>> [   14.326388] rockchip-dp ff970000.edp: wait SYS_CTL_2.
>> [   14.437247] rockchip-dp ff970000.edp: Timeout of video streamclk ok
>> [   14.443585] rockchip-dp ff970000.edp: unable to config video
>>
>>
>>>   }
>>>     static void analogix_dp_connector_destroy(struct drm_connector
>>> *connector)
>>> @@ -1035,6 +1051,18 @@ static int analogix_dp_bridge_attach(struct
>>> drm_bridge *bridge)
>>>         return 0;
>>>   }
>>>   +static void analogix_dp_bridge_pre_enable(struct drm_bridge *bridge)
>>> +{
>>> +       struct analogix_dp_device *dp = bridge->driver_private;
>>> +       int ret;
>>> +
>>> +       if (dp->plat_data->panel) {
>>> +               ret = drm_panel_prepare(dp->plat_data->panel);
>>> +               if (ret)
>>> +                       DRM_ERROR("failed to setup the panel ret = %d\n",
>>> ret);
>>> +       }
>>
>>
>> 2. Driver would failed to read EDID in some case. Panel would only be
>> powered up in bridge->pre_enable() function which later than
>> connector->get_modes() function, and this would caused DPCD transfer failed
>> in analogix_dp_handle_edid(). This seem won't caused too big issue, cause
>> userspace would read EDID again after bridge/encoder is enabled. But it's
>> better to avoid this potential bug.
>>
>>
>> [   11.065267] YKK --------- analogix_dp_detect:1052
>> [   11.729596] YKK --------- analogix_dp_get_modes:1016
>> [   11.737608] rockchip-dp ff970000.edp: analogix_dp_read_bytes_from_dpcd:
>> Aux Transaction fail!
>> [   11.749229] rockchip-dp ff970000.edp: analogix_dp_read_bytes_from_dpcd:
>> Aux Transaction fail!
>> [   11.760799] rockchip-dp ff970000.edp: analogix_dp_read_bytes_from_dpcd:
>> Aux Transaction fail!
>> [   13.315962] YKK --------- analogix_dp_detect:1052
>> [   13.984702] YKK --------- analogix_dp_get_modes:1016
>> [   13.992977] rockchip-dp ff970000.edp: analogix_dp_read_bytes_from_dpcd:
>> Aux Transaction fail!
>> [   14.004414] rockchip-dp ff970000.edp: analogix_dp_read_bytes_from_dpcd:
>> Aux Transaction fail!
>> [   14.015842] rockchip-dp ff970000.edp: analogix_dp_read_bytes_from_dpcd:
>> Aux Transaction fail!
>> [   14.183109] YKK --------- analogix_dp_bridge_pre_enable:1147
>> [   14.306301] rockchip-dp ff970000.edp: Link Training Clock Recovery
>> success
>> [   14.319130] rockchip-dp ff970000.edp: Link Training success!
>> [   14.326388] rockchip-dp ff970000.edp: wait SYS_CTL_2.
>> [   14.437247] rockchip-dp ff970000.edp: Timeout of video streamclk ok
>> [   14.443585] rockchip-dp ff970000.edp: unable to config video
>> [   14.520565] YKK --------- analogix_dp_detect:1052
>> [   14.525339] YKK --------- analogix_dp_get_modes:1016
>> [   14.531233] rockchip-dp ff970000.edp: EDID data does not include any
>> extensions.
>> [   15.595724] YKK --------- analogix_dp_detect:1052
>> [   15.600488] YKK --------- analogix_dp_get_modes:1016
>> [   15.606451] rockchip-dp ff970000.edp: EDID data does not include any
>> extensions.
>> [   17.327354] YKK --------- analogix_dp_detect:1052
>> [   17.332105] YKK --------- analogix_dp_get_modes:1016
>> [   17.338171] rockchip-dp ff970000.edp: EDID data does not include any
>> extensions.
>> [   56.236024] YKK --------- analogix_dp_detect:1052
>> [   56.240820] YKK --------- analogix_dp_get_modes:1016
>> [   56.246855] rockchip-dp ff970000.edp: EDID data does not include any
>> extensions.
>> [   64.092477] YKK --------- analogix_dp_detect:1052
>> [   64.763712] YKK --------- analogix_dp_get_modes:1016
>>
>>
>>
>> BR,
>> - Yakir
>>
>>
>>> +}
>>> +
>>>   static void analogix_dp_bridge_enable(struct drm_bridge *bridge)
>>>   {
>>>         struct analogix_dp_device *dp = bridge->driver_private;
>>> @@ -1058,6 +1086,7 @@ static void analogix_dp_bridge_enable(struct
>>> drm_bridge *bridge)
>>>   static void analogix_dp_bridge_disable(struct drm_bridge *bridge)
>>>   {
>>>         struct analogix_dp_device *dp = bridge->driver_private;
>>> +       int ret;
>>>         if (dp->dpms_mode != DRM_MODE_DPMS_ON)
>>>                 return;
>>> @@ -1077,6 +1106,10 @@ static void analogix_dp_bridge_disable(struct
>>> drm_bridge *bridge)
>>>         pm_runtime_put_sync(dp->dev);
>>>   +     ret = drm_panel_unprepare(dp->plat_data->panel);
>>> +       if (ret)
>>> +               DRM_ERROR("failed to setup the panel ret = %d\n", ret);
>>> +
>>>         dp->dpms_mode = DRM_MODE_DPMS_OFF;
>>>   }
>>>   @@ -1165,9 +1198,9 @@ static void analogix_dp_bridge_nop(struct
>>> drm_bridge *bridge)
>>>   }
>>>     static const struct drm_bridge_funcs analogix_dp_bridge_funcs = {
>>> +       .pre_enable = analogix_dp_bridge_pre_enable,
>>>         .enable = analogix_dp_bridge_enable,
>>>         .disable = analogix_dp_bridge_disable,
>>> -       .pre_enable = analogix_dp_bridge_nop,
>>>         .post_disable = analogix_dp_bridge_nop,
>>>         .mode_set = analogix_dp_bridge_mode_set,
>>>         .attach = analogix_dp_bridge_attach,
>>> @@ -1333,13 +1366,6 @@ int analogix_dp_bind(struct device *dev, struct
>>> drm_device *drm_dev,
>>>         phy_power_on(dp->phy);
>>>   -     if (dp->plat_data->panel) {
>>> -               if (drm_panel_prepare(dp->plat_data->panel)) {
>>> -                       DRM_ERROR("failed to setup the panel\n");
>>> -                       return -EBUSY;
>>> -               }
>>> -       }
>>> -
>>>         analogix_dp_init_dp(dp);
>>>         ret = devm_request_threaded_irq(&pdev->dev, dp->irq,
>>
>>
>>
>> --
>> To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc"
>> in
>> the body of a message to majordomo@vger.kernel.org
>> More majordomo info at  http://vger.kernel.org/majordomo-info.html
_______________________________________________
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Re: [PATCH] drm/analogix_dp: Ensure the panel is properly prepared/unprepared

[Yakir Yang]

Sean,

On 07/30/2016 03:16 AM, Sean Paul wrote:
> Instead of just preparing the panel on bind, actually prepare/unprepare
> during modeset/disable. The panel must be prepared in order to read hpd
> status, so we need to refcount the prepares in order to ensure we don't
> accidentally turn the panel off at the wrong time.
>
> Signed-off-by: Sean Paul <seanpaul@chromium.org>
> ---
>
>
> Hi Yakir,
> This is what I was talking about upthread. I've tested it and it seems to be working.
>
> What do you think?

Thanks for your patch, and it works. But I have introduced two 
questions, and I haven't found a way to fixed them.

> Sean
>
>
>
> drivers/gpu/drm/bridge/analogix/analogix_dp_core.c | 48 +++++++++++++++++-----
>   1 file changed, 37 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
> index 32715da..7b764a4 100644
> --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
> +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
> @@ -960,11 +960,27 @@ enum drm_connector_status
>   analogix_dp_detect(struct drm_connector *connector, bool force)
>   {
>   	struct analogix_dp_device *dp = to_dp(connector);
> +	enum drm_connector_status status = connector_status_disconnected;
> +	int ret;
>   
> -	if (analogix_dp_detect_hpd(dp))
> -		return connector_status_disconnected;
> +	if (dp->plat_data->panel && dp->dpms_mode != DRM_MODE_DPMS_ON) {
> +		ret = drm_panel_prepare(dp->plat_data->panel);
> +		if (ret) {
> +			DRM_ERROR("failed to setup panel (%d)\n", ret);
> +			return connector_status_disconnected;
> +		}
> +	}
> +
> +	if (!analogix_dp_detect_hpd(dp))
> +		status = connector_status_connected;
> +
> +	if (dp->plat_data->panel && dp->dpms_mode != DRM_MODE_DPMS_ON) {
> +		ret = drm_panel_unprepare(dp->plat_data->panel);
> +		if (ret)
> +			DRM_ERROR("failed to setup the panel ret = %d\n", ret);
> +	}
>   
> -	return connector_status_connected;
> +	return status;

1. Panel would flicker at system boot time. Your patch would flash the 
panel power in connector->detect() function when dp->dpms_mode isn't 
DRM_MODE_DPMS_OFF. So when userspace keep detect the connector status in 
boot time, we could see panel would flicker (light up for a while, and 
turn off again, and keep loop for several time). I have copied some 
kernel logs:


[   11.065267] YKK --------- analogix_dp_detect:1052
[   11.729596] YKK --------- analogix_dp_get_modes:1016
[   11.737608] rockchip-dp ff970000.edp: 
analogix_dp_read_bytes_from_dpcd: Aux Transaction fail!
[   11.749229] rockchip-dp ff970000.edp: 
analogix_dp_read_bytes_from_dpcd: Aux Transaction fail!
[   11.760799] rockchip-dp ff970000.edp: 
analogix_dp_read_bytes_from_dpcd: Aux Transaction fail!
[   13.315962] YKK --------- analogix_dp_detect:1052
[   13.984702] YKK --------- analogix_dp_get_modes:1016
[   13.992977] rockchip-dp ff970000.edp: 
analogix_dp_read_bytes_from_dpcd: Aux Transaction fail!
[   14.004414] rockchip-dp ff970000.edp: 
analogix_dp_read_bytes_from_dpcd: Aux Transaction fail!
[   14.015842] rockchip-dp ff970000.edp: 
analogix_dp_read_bytes_from_dpcd: Aux Transaction fail!
[   14.183109] YKK --------- analogix_dp_bridge_pre_enable:1147
[   14.306301] rockchip-dp ff970000.edp: Link Training Clock Recovery 
success
[   14.319130] rockchip-dp ff970000.edp: Link Training success!
[   14.326388] rockchip-dp ff970000.edp: wait SYS_CTL_2.
[   14.437247] rockchip-dp ff970000.edp: Timeout of video streamclk ok
[   14.443585] rockchip-dp ff970000.edp: unable to config video


>   }
>   
>   static void analogix_dp_connector_destroy(struct drm_connector *connector)
> @@ -1035,6 +1051,18 @@ static int analogix_dp_bridge_attach(struct drm_bridge *bridge)
>   	return 0;
>   }
>   
> +static void analogix_dp_bridge_pre_enable(struct drm_bridge *bridge)
> +{
> +	struct analogix_dp_device *dp = bridge->driver_private;
> +	int ret;
> +
> +	if (dp->plat_data->panel) {
> +		ret = drm_panel_prepare(dp->plat_data->panel);
> +		if (ret)
> +			DRM_ERROR("failed to setup the panel ret = %d\n", ret);
> +	}

2. Driver would failed to read EDID in some case. Panel would only be 
powered up in bridge->pre_enable() function which later than 
connector->get_modes() function, and this would caused DPCD transfer 
failed in analogix_dp_handle_edid(). This seem won't caused too big 
issue, cause userspace would read EDID again after bridge/encoder is 
enabled. But it's better to avoid this potential bug.


[   11.065267] YKK --------- analogix_dp_detect:1052
[   11.729596] YKK --------- analogix_dp_get_modes:1016
[   11.737608] rockchip-dp ff970000.edp: 
analogix_dp_read_bytes_from_dpcd: Aux Transaction fail!
[   11.749229] rockchip-dp ff970000.edp: 
analogix_dp_read_bytes_from_dpcd: Aux Transaction fail!
[   11.760799] rockchip-dp ff970000.edp: 
analogix_dp_read_bytes_from_dpcd: Aux Transaction fail!
[   13.315962] YKK --------- analogix_dp_detect:1052
[   13.984702] YKK --------- analogix_dp_get_modes:1016
[   13.992977] rockchip-dp ff970000.edp: 
analogix_dp_read_bytes_from_dpcd: Aux Transaction fail!
[   14.004414] rockchip-dp ff970000.edp: 
analogix_dp_read_bytes_from_dpcd: Aux Transaction fail!
[   14.015842] rockchip-dp ff970000.edp: 
analogix_dp_read_bytes_from_dpcd: Aux Transaction fail!
[   14.183109] YKK --------- analogix_dp_bridge_pre_enable:1147
[   14.306301] rockchip-dp ff970000.edp: Link Training Clock Recovery 
success
[   14.319130] rockchip-dp ff970000.edp: Link Training success!
[   14.326388] rockchip-dp ff970000.edp: wait SYS_CTL_2.
[   14.437247] rockchip-dp ff970000.edp: Timeout of video streamclk ok
[   14.443585] rockchip-dp ff970000.edp: unable to config video
[   14.520565] YKK --------- analogix_dp_detect:1052
[   14.525339] YKK --------- analogix_dp_get_modes:1016
[   14.531233] rockchip-dp ff970000.edp: EDID data does not include any 
extensions.
[   15.595724] YKK --------- analogix_dp_detect:1052
[   15.600488] YKK --------- analogix_dp_get_modes:1016
[   15.606451] rockchip-dp ff970000.edp: EDID data does not include any 
extensions.
[   17.327354] YKK --------- analogix_dp_detect:1052
[   17.332105] YKK --------- analogix_dp_get_modes:1016
[   17.338171] rockchip-dp ff970000.edp: EDID data does not include any 
extensions.
[   56.236024] YKK --------- analogix_dp_detect:1052
[   56.240820] YKK --------- analogix_dp_get_modes:1016
[   56.246855] rockchip-dp ff970000.edp: EDID data does not include any 
extensions.
[   64.092477] YKK --------- analogix_dp_detect:1052
[   64.763712] YKK --------- analogix_dp_get_modes:1016



BR,
- Yakir

> +}
> +
>   static void analogix_dp_bridge_enable(struct drm_bridge *bridge)
>   {
>   	struct analogix_dp_device *dp = bridge->driver_private;
> @@ -1058,6 +1086,7 @@ static void analogix_dp_bridge_enable(struct drm_bridge *bridge)
>   static void analogix_dp_bridge_disable(struct drm_bridge *bridge)
>   {
>   	struct analogix_dp_device *dp = bridge->driver_private;
> +	int ret;
>   
>   	if (dp->dpms_mode != DRM_MODE_DPMS_ON)
>   		return;
> @@ -1077,6 +1106,10 @@ static void analogix_dp_bridge_disable(struct drm_bridge *bridge)
>   
>   	pm_runtime_put_sync(dp->dev);
>   
> +	ret = drm_panel_unprepare(dp->plat_data->panel);
> +	if (ret)
> +		DRM_ERROR("failed to setup the panel ret = %d\n", ret);
> +
>   	dp->dpms_mode = DRM_MODE_DPMS_OFF;
>   }
>   
> @@ -1165,9 +1198,9 @@ static void analogix_dp_bridge_nop(struct drm_bridge *bridge)
>   }
>   
>   static const struct drm_bridge_funcs analogix_dp_bridge_funcs = {
> +	.pre_enable = analogix_dp_bridge_pre_enable,
>   	.enable = analogix_dp_bridge_enable,
>   	.disable = analogix_dp_bridge_disable,
> -	.pre_enable = analogix_dp_bridge_nop,
>   	.post_disable = analogix_dp_bridge_nop,
>   	.mode_set = analogix_dp_bridge_mode_set,
>   	.attach = analogix_dp_bridge_attach,
> @@ -1333,13 +1366,6 @@ int analogix_dp_bind(struct device *dev, struct drm_device *drm_dev,
>   
>   	phy_power_on(dp->phy);
>   
> -	if (dp->plat_data->panel) {
> -		if (drm_panel_prepare(dp->plat_data->panel)) {
> -			DRM_ERROR("failed to setup the panel\n");
> -			return -EBUSY;
> -		}
> -	}
> -
>   	analogix_dp_init_dp(dp);
>   
>   	ret = devm_request_threaded_irq(&pdev->dev, dp->irq,

Re: [PATCH] drm/analogix_dp: Ensure the panel is properly prepared/unprepared

[Yakir Yang]

Sean,

On 07/30/2016 03:16 AM, Sean Paul wrote:
> Instead of just preparing the panel on bind, actually prepare/unprepare
> during modeset/disable. The panel must be prepared in order to read hpd
> status, so we need to refcount the prepares in order to ensure we don't
> accidentally turn the panel off at the wrong time.
>
> Signed-off-by: Sean Paul <seanpaul@chromium.org>
> ---
>
>
> Hi Yakir,
> This is what I was talking about upthread. I've tested it and it seems to be working.
>
> What do you think?

Thanks for your patch, and it works. But I have introduced two 
questions, and I haven't found a way to fixed them.

> Sean
>
>
>
> drivers/gpu/drm/bridge/analogix/analogix_dp_core.c | 48 +++++++++++++++++-----
>   1 file changed, 37 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
> index 32715da..7b764a4 100644
> --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
> +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
> @@ -960,11 +960,27 @@ enum drm_connector_status
>   analogix_dp_detect(struct drm_connector *connector, bool force)
>   {
>   	struct analogix_dp_device *dp = to_dp(connector);
> +	enum drm_connector_status status = connector_status_disconnected;
> +	int ret;
>   
> -	if (analogix_dp_detect_hpd(dp))
> -		return connector_status_disconnected;
> +	if (dp->plat_data->panel && dp->dpms_mode != DRM_MODE_DPMS_ON) {
> +		ret = drm_panel_prepare(dp->plat_data->panel);
> +		if (ret) {
> +			DRM_ERROR("failed to setup panel (%d)\n", ret);
> +			return connector_status_disconnected;
> +		}
> +	}
> +
> +	if (!analogix_dp_detect_hpd(dp))
> +		status = connector_status_connected;
> +
> +	if (dp->plat_data->panel && dp->dpms_mode != DRM_MODE_DPMS_ON) {
> +		ret = drm_panel_unprepare(dp->plat_data->panel);
> +		if (ret)
> +			DRM_ERROR("failed to setup the panel ret = %d\n", ret);
> +	}
>   
> -	return connector_status_connected;
> +	return status;

1. Panel would flicker at system boot time. Your patch would flash the 
panel power in connector->detect() function when dp->dpms_mode isn't 
DRM_MODE_DPMS_OFF. So when userspace keep detect the connector status in 
boot time, we could see panel would flicker (light up for a while, and 
turn off again, and keep loop for several time). I have copied some 
kernel logs:


[   11.065267] YKK --------- analogix_dp_detect:1052
[   11.729596] YKK --------- analogix_dp_get_modes:1016
[   11.737608] rockchip-dp ff970000.edp: 
analogix_dp_read_bytes_from_dpcd: Aux Transaction fail!
[   11.749229] rockchip-dp ff970000.edp: 
analogix_dp_read_bytes_from_dpcd: Aux Transaction fail!
[   11.760799] rockchip-dp ff970000.edp: 
analogix_dp_read_bytes_from_dpcd: Aux Transaction fail!
[   13.315962] YKK --------- analogix_dp_detect:1052
[   13.984702] YKK --------- analogix_dp_get_modes:1016
[   13.992977] rockchip-dp ff970000.edp: 
analogix_dp_read_bytes_from_dpcd: Aux Transaction fail!
[   14.004414] rockchip-dp ff970000.edp: 
analogix_dp_read_bytes_from_dpcd: Aux Transaction fail!
[   14.015842] rockchip-dp ff970000.edp: 
analogix_dp_read_bytes_from_dpcd: Aux Transaction fail!
[   14.183109] YKK --------- analogix_dp_bridge_pre_enable:1147
[   14.306301] rockchip-dp ff970000.edp: Link Training Clock Recovery 
success
[   14.319130] rockchip-dp ff970000.edp: Link Training success!
[   14.326388] rockchip-dp ff970000.edp: wait SYS_CTL_2.
[   14.437247] rockchip-dp ff970000.edp: Timeout of video streamclk ok
[   14.443585] rockchip-dp ff970000.edp: unable to config video


>   }
>   
>   static void analogix_dp_connector_destroy(struct drm_connector *connector)
> @@ -1035,6 +1051,18 @@ static int analogix_dp_bridge_attach(struct drm_bridge *bridge)
>   	return 0;
>   }
>   
> +static void analogix_dp_bridge_pre_enable(struct drm_bridge *bridge)
> +{
> +	struct analogix_dp_device *dp = bridge->driver_private;
> +	int ret;
> +
> +	if (dp->plat_data->panel) {
> +		ret = drm_panel_prepare(dp->plat_data->panel);
> +		if (ret)
> +			DRM_ERROR("failed to setup the panel ret = %d\n", ret);
> +	}

2. Driver would failed to read EDID in some case. Panel would only be 
powered up in bridge->pre_enable() function which later than 
connector->get_modes() function, and this would caused DPCD transfer 
failed in analogix_dp_handle_edid(). This seem won't caused too big 
issue, cause userspace would read EDID again after bridge/encoder is 
enabled. But it's better to avoid this potential bug.


[   11.065267] YKK --------- analogix_dp_detect:1052
[   11.729596] YKK --------- analogix_dp_get_modes:1016
[   11.737608] rockchip-dp ff970000.edp: 
analogix_dp_read_bytes_from_dpcd: Aux Transaction fail!
[   11.749229] rockchip-dp ff970000.edp: 
analogix_dp_read_bytes_from_dpcd: Aux Transaction fail!
[   11.760799] rockchip-dp ff970000.edp: 
analogix_dp_read_bytes_from_dpcd: Aux Transaction fail!
[   13.315962] YKK --------- analogix_dp_detect:1052
[   13.984702] YKK --------- analogix_dp_get_modes:1016
[   13.992977] rockchip-dp ff970000.edp: 
analogix_dp_read_bytes_from_dpcd: Aux Transaction fail!
[   14.004414] rockchip-dp ff970000.edp: 
analogix_dp_read_bytes_from_dpcd: Aux Transaction fail!
[   14.015842] rockchip-dp ff970000.edp: 
analogix_dp_read_bytes_from_dpcd: Aux Transaction fail!
[   14.183109] YKK --------- analogix_dp_bridge_pre_enable:1147
[   14.306301] rockchip-dp ff970000.edp: Link Training Clock Recovery 
success
[   14.319130] rockchip-dp ff970000.edp: Link Training success!
[   14.326388] rockchip-dp ff970000.edp: wait SYS_CTL_2.
[   14.437247] rockchip-dp ff970000.edp: Timeout of video streamclk ok
[   14.443585] rockchip-dp ff970000.edp: unable to config video
[   14.520565] YKK --------- analogix_dp_detect:1052
[   14.525339] YKK --------- analogix_dp_get_modes:1016
[   14.531233] rockchip-dp ff970000.edp: EDID data does not include any 
extensions.
[   15.595724] YKK --------- analogix_dp_detect:1052
[   15.600488] YKK --------- analogix_dp_get_modes:1016
[   15.606451] rockchip-dp ff970000.edp: EDID data does not include any 
extensions.
[   17.327354] YKK --------- analogix_dp_detect:1052
[   17.332105] YKK --------- analogix_dp_get_modes:1016
[   17.338171] rockchip-dp ff970000.edp: EDID data does not include any 
extensions.
[   56.236024] YKK --------- analogix_dp_detect:1052
[   56.240820] YKK --------- analogix_dp_get_modes:1016
[   56.246855] rockchip-dp ff970000.edp: EDID data does not include any 
extensions.
[   64.092477] YKK --------- analogix_dp_detect:1052
[   64.763712] YKK --------- analogix_dp_get_modes:1016



BR,
- Yakir

> +}
> +
>   static void analogix_dp_bridge_enable(struct drm_bridge *bridge)
>   {
>   	struct analogix_dp_device *dp = bridge->driver_private;
> @@ -1058,6 +1086,7 @@ static void analogix_dp_bridge_enable(struct drm_bridge *bridge)
>   static void analogix_dp_bridge_disable(struct drm_bridge *bridge)
>   {
>   	struct analogix_dp_device *dp = bridge->driver_private;
> +	int ret;
>   
>   	if (dp->dpms_mode != DRM_MODE_DPMS_ON)
>   		return;
> @@ -1077,6 +1106,10 @@ static void analogix_dp_bridge_disable(struct drm_bridge *bridge)
>   
>   	pm_runtime_put_sync(dp->dev);
>   
> +	ret = drm_panel_unprepare(dp->plat_data->panel);
> +	if (ret)
> +		DRM_ERROR("failed to setup the panel ret = %d\n", ret);
> +
>   	dp->dpms_mode = DRM_MODE_DPMS_OFF;
>   }
>   
> @@ -1165,9 +1198,9 @@ static void analogix_dp_bridge_nop(struct drm_bridge *bridge)
>   }
>   
>   static const struct drm_bridge_funcs analogix_dp_bridge_funcs = {
> +	.pre_enable = analogix_dp_bridge_pre_enable,
>   	.enable = analogix_dp_bridge_enable,
>   	.disable = analogix_dp_bridge_disable,
> -	.pre_enable = analogix_dp_bridge_nop,
>   	.post_disable = analogix_dp_bridge_nop,
>   	.mode_set = analogix_dp_bridge_mode_set,
>   	.attach = analogix_dp_bridge_attach,
> @@ -1333,13 +1366,6 @@ int analogix_dp_bind(struct device *dev, struct drm_device *drm_dev,
>   
>   	phy_power_on(dp->phy);
>   
> -	if (dp->plat_data->panel) {
> -		if (drm_panel_prepare(dp->plat_data->panel)) {
> -			DRM_ERROR("failed to setup the panel\n");
> -			return -EBUSY;
> -		}
> -	}
> -
>   	analogix_dp_init_dp(dp);
>   
>   	ret = devm_request_threaded_irq(&pdev->dev, dp->irq,


_______________________________________________
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dri-devel@lists.freedesktop.org
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[PATCH v2] drm/bridge: analogix_dp: Ensure the panel is properly prepared/unprepared

[Sean Paul]

Instead of just preparing the panel on bind, actually prepare/unprepare
during modeset/disable. The panel must be prepared in order to read hpd
status and edid, so we need to keep state around the prepares in order
to ensure we don't accidentally turn the panel off at the wrong time.

Signed-off-by: Sean Paul <seanpaul@chromium.org>
---

Changes in v2:
 - Added panel_is_modeset state/lock to avoid racing detect with modeset (marcheu)
 - Added prepare/unprepare in .get_modes (yakir)

 drivers/gpu/drm/bridge/analogix/analogix_dp_core.c | 101 ++++++++++++++++++---
 drivers/gpu/drm/bridge/analogix/analogix_dp_core.h |   3 +
 2 files changed, 93 insertions(+), 11 deletions(-)

diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
index 32715da..47c449a 100644
--- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
+++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
@@ -923,11 +923,63 @@ static void analogix_dp_commit(struct analogix_dp_device *dp)
 	analogix_dp_start_video(dp);
 }
 
+/*
+ * This function is a bit of a catch-all for panel preparation, hopefully
+ * simplifying the logic of functions that need to prepare/unprepare the panel
+ * below.
+ *
+ * If @prepare is true, this function will prepare the panel. Conversely, if it
+ * is false, the panel will be unprepared.
+ *
+ * If @is_modeset_prepare is true, the function will disregard the current state
+ * of the panel and either prepare/unprepare the panel based on @prepare. Once
+ * it finishes, it will update dp->panel_is_modeset to reflect the current state
+ * of the panel.
+ */
+static int analogix_dp_prepare_panel(struct analogix_dp_device *dp,
+				     bool prepare, bool is_modeset_prepare)
+{
+	int ret = 0;
+
+	if (!dp->plat_data->panel)
+		return 0;
+
+	mutex_lock(&dp->panel_lock);
+
+	/*
+	 * Exit early if this is a temporary prepare/unprepare and we're already
+	 * modeset (since we neither want to prepare twice or unprepare early).
+	 */
+	if (dp->panel_is_modeset && !is_modeset_prepare)
+		goto out;
+
+	if (prepare)
+		ret = drm_panel_prepare(dp->plat_data->panel);
+	else
+		ret = drm_panel_unprepare(dp->plat_data->panel);
+
+	if (ret)
+		goto out;
+
+	if (is_modeset_prepare)
+		dp->panel_is_modeset = prepare;
+
+out:
+	mutex_unlock(&dp->panel_lock);
+	return ret;
+}
+
 int analogix_dp_get_modes(struct drm_connector *connector)
 {
 	struct analogix_dp_device *dp = to_dp(connector);
 	struct edid *edid = (struct edid *)dp->edid;
-	int num_modes = 0;
+	int ret, num_modes = 0;
+
+	ret = analogix_dp_prepare_panel(dp, true, false);
+	if (ret) {
+		DRM_ERROR("Failed to prepare panel (%d)\n", ret);
+		return 0;
+	}
 
 	if (analogix_dp_handle_edid(dp) == 0) {
 		drm_mode_connector_update_edid_property(&dp->connector, edid);
@@ -940,6 +992,10 @@ int analogix_dp_get_modes(struct drm_connector *connector)
 	if (dp->plat_data->get_modes)
 		num_modes += dp->plat_data->get_modes(dp->plat_data, connector);
 
+	ret = analogix_dp_prepare_panel(dp, false, false);
+	if (ret)
+		DRM_ERROR("Failed to unprepare panel (%d)\n", ret);
+
 	return num_modes;
 }
 
@@ -960,11 +1016,23 @@ enum drm_connector_status
 analogix_dp_detect(struct drm_connector *connector, bool force)
 {
 	struct analogix_dp_device *dp = to_dp(connector);
+	enum drm_connector_status status = connector_status_disconnected;
+	int ret;
 
-	if (analogix_dp_detect_hpd(dp))
+	ret = analogix_dp_prepare_panel(dp, true, false);
+	if (ret) {
+		DRM_ERROR("Failed to prepare panel (%d)\n", ret);
 		return connector_status_disconnected;
+	}
+
+	if (!analogix_dp_detect_hpd(dp))
+		status = connector_status_connected;
 
-	return connector_status_connected;
+	ret = analogix_dp_prepare_panel(dp, false, false);
+	if (ret)
+		DRM_ERROR("Failed to unprepare panel (%d)\n", ret);
+
+	return status;
 }
 
 static void analogix_dp_connector_destroy(struct drm_connector *connector)
@@ -1035,6 +1103,16 @@ static int analogix_dp_bridge_attach(struct drm_bridge *bridge)
 	return 0;
 }
 
+static void analogix_dp_bridge_pre_enable(struct drm_bridge *bridge)
+{
+	struct analogix_dp_device *dp = bridge->driver_private;
+	int ret;
+
+	ret = analogix_dp_prepare_panel(dp, true, true);
+	if (ret)
+		DRM_ERROR("failed to setup the panel ret = %d\n", ret);
+}
+
 static void analogix_dp_bridge_enable(struct drm_bridge *bridge)
 {
 	struct analogix_dp_device *dp = bridge->driver_private;
@@ -1058,6 +1136,7 @@ static void analogix_dp_bridge_enable(struct drm_bridge *bridge)
 static void analogix_dp_bridge_disable(struct drm_bridge *bridge)
 {
 	struct analogix_dp_device *dp = bridge->driver_private;
+	int ret;
 
 	if (dp->dpms_mode != DRM_MODE_DPMS_ON)
 		return;
@@ -1077,6 +1156,10 @@ static void analogix_dp_bridge_disable(struct drm_bridge *bridge)
 
 	pm_runtime_put_sync(dp->dev);
 
+	ret = analogix_dp_prepare_panel(dp, false, true);
+	if (ret)
+		DRM_ERROR("failed to setup the panel ret = %d\n", ret);
+
 	dp->dpms_mode = DRM_MODE_DPMS_OFF;
 }
 
@@ -1165,9 +1248,9 @@ static void analogix_dp_bridge_nop(struct drm_bridge *bridge)
 }
 
 static const struct drm_bridge_funcs analogix_dp_bridge_funcs = {
+	.pre_enable = analogix_dp_bridge_pre_enable,
 	.enable = analogix_dp_bridge_enable,
 	.disable = analogix_dp_bridge_disable,
-	.pre_enable = analogix_dp_bridge_nop,
 	.post_disable = analogix_dp_bridge_nop,
 	.mode_set = analogix_dp_bridge_mode_set,
 	.attach = analogix_dp_bridge_attach,
@@ -1254,6 +1337,9 @@ int analogix_dp_bind(struct device *dev, struct drm_device *drm_dev,
 	dp->dev = &pdev->dev;
 	dp->dpms_mode = DRM_MODE_DPMS_OFF;
 
+	mutex_init(&dp->panel_lock);
+	dp->panel_is_modeset = false;
+
 	/*
 	 * platform dp driver need containor_of the plat_data to get
 	 * the driver private data, so we need to store the point of
@@ -1333,13 +1419,6 @@ int analogix_dp_bind(struct device *dev, struct drm_device *drm_dev,
 
 	phy_power_on(dp->phy);
 
-	if (dp->plat_data->panel) {
-		if (drm_panel_prepare(dp->plat_data->panel)) {
-			DRM_ERROR("failed to setup the panel\n");
-			return -EBUSY;
-		}
-	}
-
 	analogix_dp_init_dp(dp);
 
 	ret = devm_request_threaded_irq(&pdev->dev, dp->irq,
diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.h b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.h
index b456380..43108d7 100644
--- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.h
+++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.h
@@ -178,6 +178,9 @@ struct analogix_dp_device {
 	bool                    force_hpd;
 	unsigned char           edid[EDID_BLOCK_LENGTH * 2];
 
+	struct mutex		panel_lock;
+	bool			panel_is_modeset;
+
 	struct analogix_dp_plat_data *plat_data;
 };
 
-- 
2.8.0.rc3.226.g39d4020

Re: [PATCH v2] drm/bridge: analogix_dp: Ensure the panel is properly prepared/unprepared

[Yakir Yang]

+ Archit


On 08/09/2016 02:53 AM, Sean Paul wrote:
> Instead of just preparing the panel on bind, actually prepare/unprepare
> during modeset/disable. The panel must be prepared in order to read hpd
> status and edid, so we need to keep state around the prepares in order
> to ensure we don't accidentally turn the panel off at the wrong time.
>
> Signed-off-by: Sean Paul <seanpaul@chromium.org>

Reviewed-by: Yakir Yang <ykk@rock-chips.com>

And I also tested this patch on RK3399 Kevin board, panel works rightly, so:
Tested-by: Yakir Yang <ykk@rock-chips.com>

Also add Archit into CC list, guess this patch should go through his 
drm_bridge's tree.

Thanks,
- Yakir

> ---
>
> Changes in v2:
>   - Added panel_is_modeset state/lock to avoid racing detect with modeset (marcheu)
>   - Added prepare/unprepare in .get_modes (yakir)
>
>   drivers/gpu/drm/bridge/analogix/analogix_dp_core.c | 101 ++++++++++++++++++---
>   drivers/gpu/drm/bridge/analogix/analogix_dp_core.h |   3 +
>   2 files changed, 93 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
> index 32715da..47c449a 100644
> --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
> +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
> @@ -923,11 +923,63 @@ static void analogix_dp_commit(struct analogix_dp_device *dp)
>   	analogix_dp_start_video(dp);
>   }
>   
> +/*
> + * This function is a bit of a catch-all for panel preparation, hopefully
> + * simplifying the logic of functions that need to prepare/unprepare the panel
> + * below.
> + *
> + * If @prepare is true, this function will prepare the panel. Conversely, if it
> + * is false, the panel will be unprepared.
> + *
> + * If @is_modeset_prepare is true, the function will disregard the current state
> + * of the panel and either prepare/unprepare the panel based on @prepare. Once
> + * it finishes, it will update dp->panel_is_modeset to reflect the current state
> + * of the panel.
> + */
> +static int analogix_dp_prepare_panel(struct analogix_dp_device *dp,
> +				     bool prepare, bool is_modeset_prepare)
> +{
> +	int ret = 0;
> +
> +	if (!dp->plat_data->panel)
> +		return 0;
> +
> +	mutex_lock(&dp->panel_lock);
> +
> +	/*
> +	 * Exit early if this is a temporary prepare/unprepare and we're already
> +	 * modeset (since we neither want to prepare twice or unprepare early).
> +	 */
> +	if (dp->panel_is_modeset && !is_modeset_prepare)
> +		goto out;
> +
> +	if (prepare)
> +		ret = drm_panel_prepare(dp->plat_data->panel);
> +	else
> +		ret = drm_panel_unprepare(dp->plat_data->panel);
> +
> +	if (ret)
> +		goto out;
> +
> +	if (is_modeset_prepare)
> +		dp->panel_is_modeset = prepare;
> +
> +out:
> +	mutex_unlock(&dp->panel_lock);
> +	return ret;
> +}
> +
>   int analogix_dp_get_modes(struct drm_connector *connector)
>   {
>   	struct analogix_dp_device *dp = to_dp(connector);
>   	struct edid *edid = (struct edid *)dp->edid;
> -	int num_modes = 0;
> +	int ret, num_modes = 0;
> +
> +	ret = analogix_dp_prepare_panel(dp, true, false);
> +	if (ret) {
> +		DRM_ERROR("Failed to prepare panel (%d)\n", ret);
> +		return 0;
> +	}
>   
>   	if (analogix_dp_handle_edid(dp) == 0) {
>   		drm_mode_connector_update_edid_property(&dp->connector, edid);
> @@ -940,6 +992,10 @@ int analogix_dp_get_modes(struct drm_connector *connector)
>   	if (dp->plat_data->get_modes)
>   		num_modes += dp->plat_data->get_modes(dp->plat_data, connector);
>   
> +	ret = analogix_dp_prepare_panel(dp, false, false);
> +	if (ret)
> +		DRM_ERROR("Failed to unprepare panel (%d)\n", ret);
> +
>   	return num_modes;
>   }
>   
> @@ -960,11 +1016,23 @@ enum drm_connector_status
>   analogix_dp_detect(struct drm_connector *connector, bool force)
>   {
>   	struct analogix_dp_device *dp = to_dp(connector);
> +	enum drm_connector_status status = connector_status_disconnected;
> +	int ret;
>   
> -	if (analogix_dp_detect_hpd(dp))
> +	ret = analogix_dp_prepare_panel(dp, true, false);
> +	if (ret) {
> +		DRM_ERROR("Failed to prepare panel (%d)\n", ret);
>   		return connector_status_disconnected;
> +	}
> +
> +	if (!analogix_dp_detect_hpd(dp))
> +		status = connector_status_connected;
>   
> -	return connector_status_connected;
> +	ret = analogix_dp_prepare_panel(dp, false, false);
> +	if (ret)
> +		DRM_ERROR("Failed to unprepare panel (%d)\n", ret);
> +
> +	return status;
>   }
>   
>   static void analogix_dp_connector_destroy(struct drm_connector *connector)
> @@ -1035,6 +1103,16 @@ static int analogix_dp_bridge_attach(struct drm_bridge *bridge)
>   	return 0;
>   }
>   
> +static void analogix_dp_bridge_pre_enable(struct drm_bridge *bridge)
> +{
> +	struct analogix_dp_device *dp = bridge->driver_private;
> +	int ret;
> +
> +	ret = analogix_dp_prepare_panel(dp, true, true);
> +	if (ret)
> +		DRM_ERROR("failed to setup the panel ret = %d\n", ret);
> +}
> +
>   static void analogix_dp_bridge_enable(struct drm_bridge *bridge)
>   {
>   	struct analogix_dp_device *dp = bridge->driver_private;
> @@ -1058,6 +1136,7 @@ static void analogix_dp_bridge_enable(struct drm_bridge *bridge)
>   static void analogix_dp_bridge_disable(struct drm_bridge *bridge)
>   {
>   	struct analogix_dp_device *dp = bridge->driver_private;
> +	int ret;
>   
>   	if (dp->dpms_mode != DRM_MODE_DPMS_ON)
>   		return;
> @@ -1077,6 +1156,10 @@ static void analogix_dp_bridge_disable(struct drm_bridge *bridge)
>   
>   	pm_runtime_put_sync(dp->dev);
>   
> +	ret = analogix_dp_prepare_panel(dp, false, true);
> +	if (ret)
> +		DRM_ERROR("failed to setup the panel ret = %d\n", ret);
> +
>   	dp->dpms_mode = DRM_MODE_DPMS_OFF;
>   }
>   
> @@ -1165,9 +1248,9 @@ static void analogix_dp_bridge_nop(struct drm_bridge *bridge)
>   }
>   
>   static const struct drm_bridge_funcs analogix_dp_bridge_funcs = {
> +	.pre_enable = analogix_dp_bridge_pre_enable,
>   	.enable = analogix_dp_bridge_enable,
>   	.disable = analogix_dp_bridge_disable,
> -	.pre_enable = analogix_dp_bridge_nop,
>   	.post_disable = analogix_dp_bridge_nop,
>   	.mode_set = analogix_dp_bridge_mode_set,
>   	.attach = analogix_dp_bridge_attach,
> @@ -1254,6 +1337,9 @@ int analogix_dp_bind(struct device *dev, struct drm_device *drm_dev,
>   	dp->dev = &pdev->dev;
>   	dp->dpms_mode = DRM_MODE_DPMS_OFF;
>   
> +	mutex_init(&dp->panel_lock);
> +	dp->panel_is_modeset = false;
> +
>   	/*
>   	 * platform dp driver need containor_of the plat_data to get
>   	 * the driver private data, so we need to store the point of
> @@ -1333,13 +1419,6 @@ int analogix_dp_bind(struct device *dev, struct drm_device *drm_dev,
>   
>   	phy_power_on(dp->phy);
>   
> -	if (dp->plat_data->panel) {
> -		if (drm_panel_prepare(dp->plat_data->panel)) {
> -			DRM_ERROR("failed to setup the panel\n");
> -			return -EBUSY;
> -		}
> -	}
> -
>   	analogix_dp_init_dp(dp);
>   
>   	ret = devm_request_threaded_irq(&pdev->dev, dp->irq,
> diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.h b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.h
> index b456380..43108d7 100644
> --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.h
> +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.h
> @@ -178,6 +178,9 @@ struct analogix_dp_device {
>   	bool                    force_hpd;
>   	unsigned char           edid[EDID_BLOCK_LENGTH * 2];
>   
> +	struct mutex		panel_lock;
> +	bool			panel_is_modeset;
> +
>   	struct analogix_dp_plat_data *plat_data;
>   };
>   

Re: [PATCH v2] drm/bridge: analogix_dp: Ensure the panel is properly prepared/unprepared

[Yakir Yang]

+ Archit


On 08/09/2016 02:53 AM, Sean Paul wrote:
> Instead of just preparing the panel on bind, actually prepare/unprepare
> during modeset/disable. The panel must be prepared in order to read hpd
> status and edid, so we need to keep state around the prepares in order
> to ensure we don't accidentally turn the panel off at the wrong time.
>
> Signed-off-by: Sean Paul <seanpaul@chromium.org>

Reviewed-by: Yakir Yang <ykk@rock-chips.com>

And I also tested this patch on RK3399 Kevin board, panel works rightly, so:
Tested-by: Yakir Yang <ykk@rock-chips.com>

Also add Archit into CC list, guess this patch should go through his 
drm_bridge's tree.

Thanks,
- Yakir

> ---
>
> Changes in v2:
>   - Added panel_is_modeset state/lock to avoid racing detect with modeset (marcheu)
>   - Added prepare/unprepare in .get_modes (yakir)
>
>   drivers/gpu/drm/bridge/analogix/analogix_dp_core.c | 101 ++++++++++++++++++---
>   drivers/gpu/drm/bridge/analogix/analogix_dp_core.h |   3 +
>   2 files changed, 93 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
> index 32715da..47c449a 100644
> --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
> +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
> @@ -923,11 +923,63 @@ static void analogix_dp_commit(struct analogix_dp_device *dp)
>   	analogix_dp_start_video(dp);
>   }
>   
> +/*
> + * This function is a bit of a catch-all for panel preparation, hopefully
> + * simplifying the logic of functions that need to prepare/unprepare the panel
> + * below.
> + *
> + * If @prepare is true, this function will prepare the panel. Conversely, if it
> + * is false, the panel will be unprepared.
> + *
> + * If @is_modeset_prepare is true, the function will disregard the current state
> + * of the panel and either prepare/unprepare the panel based on @prepare. Once
> + * it finishes, it will update dp->panel_is_modeset to reflect the current state
> + * of the panel.
> + */
> +static int analogix_dp_prepare_panel(struct analogix_dp_device *dp,
> +				     bool prepare, bool is_modeset_prepare)
> +{
> +	int ret = 0;
> +
> +	if (!dp->plat_data->panel)
> +		return 0;
> +
> +	mutex_lock(&dp->panel_lock);
> +
> +	/*
> +	 * Exit early if this is a temporary prepare/unprepare and we're already
> +	 * modeset (since we neither want to prepare twice or unprepare early).
> +	 */
> +	if (dp->panel_is_modeset && !is_modeset_prepare)
> +		goto out;
> +
> +	if (prepare)
> +		ret = drm_panel_prepare(dp->plat_data->panel);
> +	else
> +		ret = drm_panel_unprepare(dp->plat_data->panel);
> +
> +	if (ret)
> +		goto out;
> +
> +	if (is_modeset_prepare)
> +		dp->panel_is_modeset = prepare;
> +
> +out:
> +	mutex_unlock(&dp->panel_lock);
> +	return ret;
> +}
> +
>   int analogix_dp_get_modes(struct drm_connector *connector)
>   {
>   	struct analogix_dp_device *dp = to_dp(connector);
>   	struct edid *edid = (struct edid *)dp->edid;
> -	int num_modes = 0;
> +	int ret, num_modes = 0;
> +
> +	ret = analogix_dp_prepare_panel(dp, true, false);
> +	if (ret) {
> +		DRM_ERROR("Failed to prepare panel (%d)\n", ret);
> +		return 0;
> +	}
>   
>   	if (analogix_dp_handle_edid(dp) == 0) {
>   		drm_mode_connector_update_edid_property(&dp->connector, edid);
> @@ -940,6 +992,10 @@ int analogix_dp_get_modes(struct drm_connector *connector)
>   	if (dp->plat_data->get_modes)
>   		num_modes += dp->plat_data->get_modes(dp->plat_data, connector);
>   
> +	ret = analogix_dp_prepare_panel(dp, false, false);
> +	if (ret)
> +		DRM_ERROR("Failed to unprepare panel (%d)\n", ret);
> +
>   	return num_modes;
>   }
>   
> @@ -960,11 +1016,23 @@ enum drm_connector_status
>   analogix_dp_detect(struct drm_connector *connector, bool force)
>   {
>   	struct analogix_dp_device *dp = to_dp(connector);
> +	enum drm_connector_status status = connector_status_disconnected;
> +	int ret;
>   
> -	if (analogix_dp_detect_hpd(dp))
> +	ret = analogix_dp_prepare_panel(dp, true, false);
> +	if (ret) {
> +		DRM_ERROR("Failed to prepare panel (%d)\n", ret);
>   		return connector_status_disconnected;
> +	}
> +
> +	if (!analogix_dp_detect_hpd(dp))
> +		status = connector_status_connected;
>   
> -	return connector_status_connected;
> +	ret = analogix_dp_prepare_panel(dp, false, false);
> +	if (ret)
> +		DRM_ERROR("Failed to unprepare panel (%d)\n", ret);
> +
> +	return status;
>   }
>   
>   static void analogix_dp_connector_destroy(struct drm_connector *connector)
> @@ -1035,6 +1103,16 @@ static int analogix_dp_bridge_attach(struct drm_bridge *bridge)
>   	return 0;
>   }
>   
> +static void analogix_dp_bridge_pre_enable(struct drm_bridge *bridge)
> +{
> +	struct analogix_dp_device *dp = bridge->driver_private;
> +	int ret;
> +
> +	ret = analogix_dp_prepare_panel(dp, true, true);
> +	if (ret)
> +		DRM_ERROR("failed to setup the panel ret = %d\n", ret);
> +}
> +
>   static void analogix_dp_bridge_enable(struct drm_bridge *bridge)
>   {
>   	struct analogix_dp_device *dp = bridge->driver_private;
> @@ -1058,6 +1136,7 @@ static void analogix_dp_bridge_enable(struct drm_bridge *bridge)
>   static void analogix_dp_bridge_disable(struct drm_bridge *bridge)
>   {
>   	struct analogix_dp_device *dp = bridge->driver_private;
> +	int ret;
>   
>   	if (dp->dpms_mode != DRM_MODE_DPMS_ON)
>   		return;
> @@ -1077,6 +1156,10 @@ static void analogix_dp_bridge_disable(struct drm_bridge *bridge)
>   
>   	pm_runtime_put_sync(dp->dev);
>   
> +	ret = analogix_dp_prepare_panel(dp, false, true);
> +	if (ret)
> +		DRM_ERROR("failed to setup the panel ret = %d\n", ret);
> +
>   	dp->dpms_mode = DRM_MODE_DPMS_OFF;
>   }
>   
> @@ -1165,9 +1248,9 @@ static void analogix_dp_bridge_nop(struct drm_bridge *bridge)
>   }
>   
>   static const struct drm_bridge_funcs analogix_dp_bridge_funcs = {
> +	.pre_enable = analogix_dp_bridge_pre_enable,
>   	.enable = analogix_dp_bridge_enable,
>   	.disable = analogix_dp_bridge_disable,
> -	.pre_enable = analogix_dp_bridge_nop,
>   	.post_disable = analogix_dp_bridge_nop,
>   	.mode_set = analogix_dp_bridge_mode_set,
>   	.attach = analogix_dp_bridge_attach,
> @@ -1254,6 +1337,9 @@ int analogix_dp_bind(struct device *dev, struct drm_device *drm_dev,
>   	dp->dev = &pdev->dev;
>   	dp->dpms_mode = DRM_MODE_DPMS_OFF;
>   
> +	mutex_init(&dp->panel_lock);
> +	dp->panel_is_modeset = false;
> +
>   	/*
>   	 * platform dp driver need containor_of the plat_data to get
>   	 * the driver private data, so we need to store the point of
> @@ -1333,13 +1419,6 @@ int analogix_dp_bind(struct device *dev, struct drm_device *drm_dev,
>   
>   	phy_power_on(dp->phy);
>   
> -	if (dp->plat_data->panel) {
> -		if (drm_panel_prepare(dp->plat_data->panel)) {
> -			DRM_ERROR("failed to setup the panel\n");
> -			return -EBUSY;
> -		}
> -	}
> -
>   	analogix_dp_init_dp(dp);
>   
>   	ret = devm_request_threaded_irq(&pdev->dev, dp->irq,
> diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.h b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.h
> index b456380..43108d7 100644
> --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.h
> +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.h
> @@ -178,6 +178,9 @@ struct analogix_dp_device {
>   	bool                    force_hpd;
>   	unsigned char           edid[EDID_BLOCK_LENGTH * 2];
>   
> +	struct mutex		panel_lock;
> +	bool			panel_is_modeset;
> +
>   	struct analogix_dp_plat_data *plat_data;
>   };
>   


_______________________________________________
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Re: [PATCH v2] drm/bridge: analogix_dp: Ensure the panel is properly prepared/unprepared

[Daniel Vetter]

On Tue, Aug 09, 2016 at 10:35:57AM +0800, Yakir Yang wrote:
> + Archit
> 
> 
> On 08/09/2016 02:53 AM, Sean Paul wrote:
> > Instead of just preparing the panel on bind, actually prepare/unprepare
> > during modeset/disable. The panel must be prepared in order to read hpd
> > status and edid, so we need to keep state around the prepares in order
> > to ensure we don't accidentally turn the panel off at the wrong time.
> > 
> > Signed-off-by: Sean Paul <seanpaul@chromium.org>
> 
> Reviewed-by: Yakir Yang <ykk@rock-chips.com>
> 
> And I also tested this patch on RK3399 Kevin board, panel works rightly, so:
> Tested-by: Yakir Yang <ykk@rock-chips.com>
> 
> Also add Archit into CC list, guess this patch should go through his
> drm_bridge's tree.

drm_bridge stuff moved to -misc ;-)
-Daniel

> 
> Thanks,
> - Yakir
> 
> > ---
> > 
> > Changes in v2:
> >   - Added panel_is_modeset state/lock to avoid racing detect with modeset (marcheu)
> >   - Added prepare/unprepare in .get_modes (yakir)
> > 
> >   drivers/gpu/drm/bridge/analogix/analogix_dp_core.c | 101 ++++++++++++++++++---
> >   drivers/gpu/drm/bridge/analogix/analogix_dp_core.h |   3 +
> >   2 files changed, 93 insertions(+), 11 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
> > index 32715da..47c449a 100644
> > --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
> > +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
> > @@ -923,11 +923,63 @@ static void analogix_dp_commit(struct analogix_dp_device *dp)
> >   	analogix_dp_start_video(dp);
> >   }
> > +/*
> > + * This function is a bit of a catch-all for panel preparation, hopefully
> > + * simplifying the logic of functions that need to prepare/unprepare the panel
> > + * below.
> > + *
> > + * If @prepare is true, this function will prepare the panel. Conversely, if it
> > + * is false, the panel will be unprepared.
> > + *
> > + * If @is_modeset_prepare is true, the function will disregard the current state
> > + * of the panel and either prepare/unprepare the panel based on @prepare. Once
> > + * it finishes, it will update dp->panel_is_modeset to reflect the current state
> > + * of the panel.
> > + */
> > +static int analogix_dp_prepare_panel(struct analogix_dp_device *dp,
> > +				     bool prepare, bool is_modeset_prepare)
> > +{
> > +	int ret = 0;
> > +
> > +	if (!dp->plat_data->panel)
> > +		return 0;
> > +
> > +	mutex_lock(&dp->panel_lock);
> > +
> > +	/*
> > +	 * Exit early if this is a temporary prepare/unprepare and we're already
> > +	 * modeset (since we neither want to prepare twice or unprepare early).
> > +	 */
> > +	if (dp->panel_is_modeset && !is_modeset_prepare)
> > +		goto out;
> > +
> > +	if (prepare)
> > +		ret = drm_panel_prepare(dp->plat_data->panel);
> > +	else
> > +		ret = drm_panel_unprepare(dp->plat_data->panel);
> > +
> > +	if (ret)
> > +		goto out;
> > +
> > +	if (is_modeset_prepare)
> > +		dp->panel_is_modeset = prepare;
> > +
> > +out:
> > +	mutex_unlock(&dp->panel_lock);
> > +	return ret;
> > +}
> > +
> >   int analogix_dp_get_modes(struct drm_connector *connector)
> >   {
> >   	struct analogix_dp_device *dp = to_dp(connector);
> >   	struct edid *edid = (struct edid *)dp->edid;
> > -	int num_modes = 0;
> > +	int ret, num_modes = 0;
> > +
> > +	ret = analogix_dp_prepare_panel(dp, true, false);
> > +	if (ret) {
> > +		DRM_ERROR("Failed to prepare panel (%d)\n", ret);
> > +		return 0;
> > +	}
> >   	if (analogix_dp_handle_edid(dp) == 0) {
> >   		drm_mode_connector_update_edid_property(&dp->connector, edid);
> > @@ -940,6 +992,10 @@ int analogix_dp_get_modes(struct drm_connector *connector)
> >   	if (dp->plat_data->get_modes)
> >   		num_modes += dp->plat_data->get_modes(dp->plat_data, connector);
> > +	ret = analogix_dp_prepare_panel(dp, false, false);
> > +	if (ret)
> > +		DRM_ERROR("Failed to unprepare panel (%d)\n", ret);
> > +
> >   	return num_modes;
> >   }
> > @@ -960,11 +1016,23 @@ enum drm_connector_status
> >   analogix_dp_detect(struct drm_connector *connector, bool force)
> >   {
> >   	struct analogix_dp_device *dp = to_dp(connector);
> > +	enum drm_connector_status status = connector_status_disconnected;
> > +	int ret;
> > -	if (analogix_dp_detect_hpd(dp))
> > +	ret = analogix_dp_prepare_panel(dp, true, false);
> > +	if (ret) {
> > +		DRM_ERROR("Failed to prepare panel (%d)\n", ret);
> >   		return connector_status_disconnected;
> > +	}
> > +
> > +	if (!analogix_dp_detect_hpd(dp))
> > +		status = connector_status_connected;
> > -	return connector_status_connected;
> > +	ret = analogix_dp_prepare_panel(dp, false, false);
> > +	if (ret)
> > +		DRM_ERROR("Failed to unprepare panel (%d)\n", ret);
> > +
> > +	return status;
> >   }
> >   static void analogix_dp_connector_destroy(struct drm_connector *connector)
> > @@ -1035,6 +1103,16 @@ static int analogix_dp_bridge_attach(struct drm_bridge *bridge)
> >   	return 0;
> >   }
> > +static void analogix_dp_bridge_pre_enable(struct drm_bridge *bridge)
> > +{
> > +	struct analogix_dp_device *dp = bridge->driver_private;
> > +	int ret;
> > +
> > +	ret = analogix_dp_prepare_panel(dp, true, true);
> > +	if (ret)
> > +		DRM_ERROR("failed to setup the panel ret = %d\n", ret);
> > +}
> > +
> >   static void analogix_dp_bridge_enable(struct drm_bridge *bridge)
> >   {
> >   	struct analogix_dp_device *dp = bridge->driver_private;
> > @@ -1058,6 +1136,7 @@ static void analogix_dp_bridge_enable(struct drm_bridge *bridge)
> >   static void analogix_dp_bridge_disable(struct drm_bridge *bridge)
> >   {
> >   	struct analogix_dp_device *dp = bridge->driver_private;
> > +	int ret;
> >   	if (dp->dpms_mode != DRM_MODE_DPMS_ON)
> >   		return;
> > @@ -1077,6 +1156,10 @@ static void analogix_dp_bridge_disable(struct drm_bridge *bridge)
> >   	pm_runtime_put_sync(dp->dev);
> > +	ret = analogix_dp_prepare_panel(dp, false, true);
> > +	if (ret)
> > +		DRM_ERROR("failed to setup the panel ret = %d\n", ret);
> > +
> >   	dp->dpms_mode = DRM_MODE_DPMS_OFF;
> >   }
> > @@ -1165,9 +1248,9 @@ static void analogix_dp_bridge_nop(struct drm_bridge *bridge)
> >   }
> >   static const struct drm_bridge_funcs analogix_dp_bridge_funcs = {
> > +	.pre_enable = analogix_dp_bridge_pre_enable,
> >   	.enable = analogix_dp_bridge_enable,
> >   	.disable = analogix_dp_bridge_disable,
> > -	.pre_enable = analogix_dp_bridge_nop,
> >   	.post_disable = analogix_dp_bridge_nop,
> >   	.mode_set = analogix_dp_bridge_mode_set,
> >   	.attach = analogix_dp_bridge_attach,
> > @@ -1254,6 +1337,9 @@ int analogix_dp_bind(struct device *dev, struct drm_device *drm_dev,
> >   	dp->dev = &pdev->dev;
> >   	dp->dpms_mode = DRM_MODE_DPMS_OFF;
> > +	mutex_init(&dp->panel_lock);
> > +	dp->panel_is_modeset = false;
> > +
> >   	/*
> >   	 * platform dp driver need containor_of the plat_data to get
> >   	 * the driver private data, so we need to store the point of
> > @@ -1333,13 +1419,6 @@ int analogix_dp_bind(struct device *dev, struct drm_device *drm_dev,
> >   	phy_power_on(dp->phy);
> > -	if (dp->plat_data->panel) {
> > -		if (drm_panel_prepare(dp->plat_data->panel)) {
> > -			DRM_ERROR("failed to setup the panel\n");
> > -			return -EBUSY;
> > -		}
> > -	}
> > -
> >   	analogix_dp_init_dp(dp);
> >   	ret = devm_request_threaded_irq(&pdev->dev, dp->irq,
> > diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.h b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.h
> > index b456380..43108d7 100644
> > --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.h
> > +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.h
> > @@ -178,6 +178,9 @@ struct analogix_dp_device {
> >   	bool                    force_hpd;
> >   	unsigned char           edid[EDID_BLOCK_LENGTH * 2];
> > +	struct mutex		panel_lock;
> > +	bool			panel_is_modeset;
> > +
> >   	struct analogix_dp_plat_data *plat_data;
> >   };
> 
> 
> _______________________________________________
> dri-devel mailing list
> dri-devel@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch

Re: [PATCH v2] drm/bridge: analogix_dp: Ensure the panel is properly prepared/unprepared

[Daniel Vetter]

On Tue, Aug 09, 2016 at 10:35:57AM +0800, Yakir Yang wrote:
> + Archit
> 
> 
> On 08/09/2016 02:53 AM, Sean Paul wrote:
> > Instead of just preparing the panel on bind, actually prepare/unprepare
> > during modeset/disable. The panel must be prepared in order to read hpd
> > status and edid, so we need to keep state around the prepares in order
> > to ensure we don't accidentally turn the panel off at the wrong time.
> > 
> > Signed-off-by: Sean Paul <seanpaul@chromium.org>
> 
> Reviewed-by: Yakir Yang <ykk@rock-chips.com>
> 
> And I also tested this patch on RK3399 Kevin board, panel works rightly, so:
> Tested-by: Yakir Yang <ykk@rock-chips.com>
> 
> Also add Archit into CC list, guess this patch should go through his
> drm_bridge's tree.

drm_bridge stuff moved to -misc ;-)
-Daniel

> 
> Thanks,
> - Yakir
> 
> > ---
> > 
> > Changes in v2:
> >   - Added panel_is_modeset state/lock to avoid racing detect with modeset (marcheu)
> >   - Added prepare/unprepare in .get_modes (yakir)
> > 
> >   drivers/gpu/drm/bridge/analogix/analogix_dp_core.c | 101 ++++++++++++++++++---
> >   drivers/gpu/drm/bridge/analogix/analogix_dp_core.h |   3 +
> >   2 files changed, 93 insertions(+), 11 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
> > index 32715da..47c449a 100644
> > --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
> > +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
> > @@ -923,11 +923,63 @@ static void analogix_dp_commit(struct analogix_dp_device *dp)
> >   	analogix_dp_start_video(dp);
> >   }
> > +/*
> > + * This function is a bit of a catch-all for panel preparation, hopefully
> > + * simplifying the logic of functions that need to prepare/unprepare the panel
> > + * below.
> > + *
> > + * If @prepare is true, this function will prepare the panel. Conversely, if it
> > + * is false, the panel will be unprepared.
> > + *
> > + * If @is_modeset_prepare is true, the function will disregard the current state
> > + * of the panel and either prepare/unprepare the panel based on @prepare. Once
> > + * it finishes, it will update dp->panel_is_modeset to reflect the current state
> > + * of the panel.
> > + */
> > +static int analogix_dp_prepare_panel(struct analogix_dp_device *dp,
> > +				     bool prepare, bool is_modeset_prepare)
> > +{
> > +	int ret = 0;
> > +
> > +	if (!dp->plat_data->panel)
> > +		return 0;
> > +
> > +	mutex_lock(&dp->panel_lock);
> > +
> > +	/*
> > +	 * Exit early if this is a temporary prepare/unprepare and we're already
> > +	 * modeset (since we neither want to prepare twice or unprepare early).
> > +	 */
> > +	if (dp->panel_is_modeset && !is_modeset_prepare)
> > +		goto out;
> > +
> > +	if (prepare)
> > +		ret = drm_panel_prepare(dp->plat_data->panel);
> > +	else
> > +		ret = drm_panel_unprepare(dp->plat_data->panel);
> > +
> > +	if (ret)
> > +		goto out;
> > +
> > +	if (is_modeset_prepare)
> > +		dp->panel_is_modeset = prepare;
> > +
> > +out:
> > +	mutex_unlock(&dp->panel_lock);
> > +	return ret;
> > +}
> > +
> >   int analogix_dp_get_modes(struct drm_connector *connector)
> >   {
> >   	struct analogix_dp_device *dp = to_dp(connector);
> >   	struct edid *edid = (struct edid *)dp->edid;
> > -	int num_modes = 0;
> > +	int ret, num_modes = 0;
> > +
> > +	ret = analogix_dp_prepare_panel(dp, true, false);
> > +	if (ret) {
> > +		DRM_ERROR("Failed to prepare panel (%d)\n", ret);
> > +		return 0;
> > +	}
> >   	if (analogix_dp_handle_edid(dp) == 0) {
> >   		drm_mode_connector_update_edid_property(&dp->connector, edid);
> > @@ -940,6 +992,10 @@ int analogix_dp_get_modes(struct drm_connector *connector)
> >   	if (dp->plat_data->get_modes)
> >   		num_modes += dp->plat_data->get_modes(dp->plat_data, connector);
> > +	ret = analogix_dp_prepare_panel(dp, false, false);
> > +	if (ret)
> > +		DRM_ERROR("Failed to unprepare panel (%d)\n", ret);
> > +
> >   	return num_modes;
> >   }
> > @@ -960,11 +1016,23 @@ enum drm_connector_status
> >   analogix_dp_detect(struct drm_connector *connector, bool force)
> >   {
> >   	struct analogix_dp_device *dp = to_dp(connector);
> > +	enum drm_connector_status status = connector_status_disconnected;
> > +	int ret;
> > -	if (analogix_dp_detect_hpd(dp))
> > +	ret = analogix_dp_prepare_panel(dp, true, false);
> > +	if (ret) {
> > +		DRM_ERROR("Failed to prepare panel (%d)\n", ret);
> >   		return connector_status_disconnected;
> > +	}
> > +
> > +	if (!analogix_dp_detect_hpd(dp))
> > +		status = connector_status_connected;
> > -	return connector_status_connected;
> > +	ret = analogix_dp_prepare_panel(dp, false, false);
> > +	if (ret)
> > +		DRM_ERROR("Failed to unprepare panel (%d)\n", ret);
> > +
> > +	return status;
> >   }
> >   static void analogix_dp_connector_destroy(struct drm_connector *connector)
> > @@ -1035,6 +1103,16 @@ static int analogix_dp_bridge_attach(struct drm_bridge *bridge)
> >   	return 0;
> >   }
> > +static void analogix_dp_bridge_pre_enable(struct drm_bridge *bridge)
> > +{
> > +	struct analogix_dp_device *dp = bridge->driver_private;
> > +	int ret;
> > +
> > +	ret = analogix_dp_prepare_panel(dp, true, true);
> > +	if (ret)
> > +		DRM_ERROR("failed to setup the panel ret = %d\n", ret);
> > +}
> > +
> >   static void analogix_dp_bridge_enable(struct drm_bridge *bridge)
> >   {
> >   	struct analogix_dp_device *dp = bridge->driver_private;
> > @@ -1058,6 +1136,7 @@ static void analogix_dp_bridge_enable(struct drm_bridge *bridge)
> >   static void analogix_dp_bridge_disable(struct drm_bridge *bridge)
> >   {
> >   	struct analogix_dp_device *dp = bridge->driver_private;
> > +	int ret;
> >   	if (dp->dpms_mode != DRM_MODE_DPMS_ON)
> >   		return;
> > @@ -1077,6 +1156,10 @@ static void analogix_dp_bridge_disable(struct drm_bridge *bridge)
> >   	pm_runtime_put_sync(dp->dev);
> > +	ret = analogix_dp_prepare_panel(dp, false, true);
> > +	if (ret)
> > +		DRM_ERROR("failed to setup the panel ret = %d\n", ret);
> > +
> >   	dp->dpms_mode = DRM_MODE_DPMS_OFF;
> >   }
> > @@ -1165,9 +1248,9 @@ static void analogix_dp_bridge_nop(struct drm_bridge *bridge)
> >   }
> >   static const struct drm_bridge_funcs analogix_dp_bridge_funcs = {
> > +	.pre_enable = analogix_dp_bridge_pre_enable,
> >   	.enable = analogix_dp_bridge_enable,
> >   	.disable = analogix_dp_bridge_disable,
> > -	.pre_enable = analogix_dp_bridge_nop,
> >   	.post_disable = analogix_dp_bridge_nop,
> >   	.mode_set = analogix_dp_bridge_mode_set,
> >   	.attach = analogix_dp_bridge_attach,
> > @@ -1254,6 +1337,9 @@ int analogix_dp_bind(struct device *dev, struct drm_device *drm_dev,
> >   	dp->dev = &pdev->dev;
> >   	dp->dpms_mode = DRM_MODE_DPMS_OFF;
> > +	mutex_init(&dp->panel_lock);
> > +	dp->panel_is_modeset = false;
> > +
> >   	/*
> >   	 * platform dp driver need containor_of the plat_data to get
> >   	 * the driver private data, so we need to store the point of
> > @@ -1333,13 +1419,6 @@ int analogix_dp_bind(struct device *dev, struct drm_device *drm_dev,
> >   	phy_power_on(dp->phy);
> > -	if (dp->plat_data->panel) {
> > -		if (drm_panel_prepare(dp->plat_data->panel)) {
> > -			DRM_ERROR("failed to setup the panel\n");
> > -			return -EBUSY;
> > -		}
> > -	}
> > -
> >   	analogix_dp_init_dp(dp);
> >   	ret = devm_request_threaded_irq(&pdev->dev, dp->irq,
> > diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.h b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.h
> > index b456380..43108d7 100644
> > --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.h
> > +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.h
> > @@ -178,6 +178,9 @@ struct analogix_dp_device {
> >   	bool                    force_hpd;
> >   	unsigned char           edid[EDID_BLOCK_LENGTH * 2];
> > +	struct mutex		panel_lock;
> > +	bool			panel_is_modeset;
> > +
> >   	struct analogix_dp_plat_data *plat_data;
> >   };
> 
> 
> _______________________________________________
> dri-devel mailing list
> dri-devel@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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Re: [PATCH v2] drm/bridge: analogix_dp: Ensure the panel is properly prepared/unprepared

[Archit Taneja]

On 08/09/2016 08:05 AM, Yakir Yang wrote:
> + Archit
>
>
> On 08/09/2016 02:53 AM, Sean Paul wrote:
>> Instead of just preparing the panel on bind, actually prepare/unprepare
>> during modeset/disable. The panel must be prepared in order to read hpd
>> status and edid, so we need to keep state around the prepares in order
>> to ensure we don't accidentally turn the panel off at the wrong time.
>>
>> Signed-off-by: Sean Paul <seanpaul@chromium.org>
>
> Reviewed-by: Yakir Yang <ykk@rock-chips.com>
>
> And I also tested this patch on RK3399 Kevin board, panel works rightly,
> so:
> Tested-by: Yakir Yang <ykk@rock-chips.com>
>
> Also add Archit into CC list, guess this patch should go through his
> drm_bridge's tree.

Reviewed-by: Archit Taneja <architt@codeaurora.org>

>
> Thanks,
> - Yakir
>
>> ---
>>
>> Changes in v2:
>>   - Added panel_is_modeset state/lock to avoid racing detect with
>> modeset (marcheu)
>>   - Added prepare/unprepare in .get_modes (yakir)
>>
>>   drivers/gpu/drm/bridge/analogix/analogix_dp_core.c | 101
>> ++++++++++++++++++---
>>   drivers/gpu/drm/bridge/analogix/analogix_dp_core.h |   3 +
>>   2 files changed, 93 insertions(+), 11 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
>> b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
>> index 32715da..47c449a 100644
>> --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
>> +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
>> @@ -923,11 +923,63 @@ static void analogix_dp_commit(struct
>> analogix_dp_device *dp)
>>       analogix_dp_start_video(dp);
>>   }
>> +/*
>> + * This function is a bit of a catch-all for panel preparation,
>> hopefully
>> + * simplifying the logic of functions that need to prepare/unprepare
>> the panel
>> + * below.
>> + *
>> + * If @prepare is true, this function will prepare the panel.
>> Conversely, if it
>> + * is false, the panel will be unprepared.
>> + *
>> + * If @is_modeset_prepare is true, the function will disregard the
>> current state
>> + * of the panel and either prepare/unprepare the panel based on
>> @prepare. Once
>> + * it finishes, it will update dp->panel_is_modeset to reflect the
>> current state
>> + * of the panel.
>> + */
>> +static int analogix_dp_prepare_panel(struct analogix_dp_device *dp,
>> +                     bool prepare, bool is_modeset_prepare)
>> +{
>> +    int ret = 0;
>> +
>> +    if (!dp->plat_data->panel)
>> +        return 0;
>> +
>> +    mutex_lock(&dp->panel_lock);
>> +
>> +    /*
>> +     * Exit early if this is a temporary prepare/unprepare and we're
>> already
>> +     * modeset (since we neither want to prepare twice or unprepare
>> early).
>> +     */
>> +    if (dp->panel_is_modeset && !is_modeset_prepare)
>> +        goto out;
>> +
>> +    if (prepare)
>> +        ret = drm_panel_prepare(dp->plat_data->panel);
>> +    else
>> +        ret = drm_panel_unprepare(dp->plat_data->panel);
>> +
>> +    if (ret)
>> +        goto out;
>> +
>> +    if (is_modeset_prepare)
>> +        dp->panel_is_modeset = prepare;
>> +
>> +out:
>> +    mutex_unlock(&dp->panel_lock);
>> +    return ret;
>> +}
>> +
>>   int analogix_dp_get_modes(struct drm_connector *connector)
>>   {
>>       struct analogix_dp_device *dp = to_dp(connector);
>>       struct edid *edid = (struct edid *)dp->edid;
>> -    int num_modes = 0;
>> +    int ret, num_modes = 0;
>> +
>> +    ret = analogix_dp_prepare_panel(dp, true, false);
>> +    if (ret) {
>> +        DRM_ERROR("Failed to prepare panel (%d)\n", ret);
>> +        return 0;
>> +    }
>>       if (analogix_dp_handle_edid(dp) == 0) {
>>           drm_mode_connector_update_edid_property(&dp->connector, edid);
>> @@ -940,6 +992,10 @@ int analogix_dp_get_modes(struct drm_connector
>> *connector)
>>       if (dp->plat_data->get_modes)
>>           num_modes += dp->plat_data->get_modes(dp->plat_data,
>> connector);
>> +    ret = analogix_dp_prepare_panel(dp, false, false);
>> +    if (ret)
>> +        DRM_ERROR("Failed to unprepare panel (%d)\n", ret);
>> +
>>       return num_modes;
>>   }
>> @@ -960,11 +1016,23 @@ enum drm_connector_status
>>   analogix_dp_detect(struct drm_connector *connector, bool force)
>>   {
>>       struct analogix_dp_device *dp = to_dp(connector);
>> +    enum drm_connector_status status = connector_status_disconnected;
>> +    int ret;
>> -    if (analogix_dp_detect_hpd(dp))
>> +    ret = analogix_dp_prepare_panel(dp, true, false);
>> +    if (ret) {
>> +        DRM_ERROR("Failed to prepare panel (%d)\n", ret);
>>           return connector_status_disconnected;
>> +    }
>> +
>> +    if (!analogix_dp_detect_hpd(dp))
>> +        status = connector_status_connected;
>> -    return connector_status_connected;
>> +    ret = analogix_dp_prepare_panel(dp, false, false);
>> +    if (ret)
>> +        DRM_ERROR("Failed to unprepare panel (%d)\n", ret);
>> +
>> +    return status;
>>   }
>>   static void analogix_dp_connector_destroy(struct drm_connector
>> *connector)
>> @@ -1035,6 +1103,16 @@ static int analogix_dp_bridge_attach(struct
>> drm_bridge *bridge)
>>       return 0;
>>   }
>> +static void analogix_dp_bridge_pre_enable(struct drm_bridge *bridge)
>> +{
>> +    struct analogix_dp_device *dp = bridge->driver_private;
>> +    int ret;
>> +
>> +    ret = analogix_dp_prepare_panel(dp, true, true);
>> +    if (ret)
>> +        DRM_ERROR("failed to setup the panel ret = %d\n", ret);
>> +}
>> +
>>   static void analogix_dp_bridge_enable(struct drm_bridge *bridge)
>>   {
>>       struct analogix_dp_device *dp = bridge->driver_private;
>> @@ -1058,6 +1136,7 @@ static void analogix_dp_bridge_enable(struct
>> drm_bridge *bridge)
>>   static void analogix_dp_bridge_disable(struct drm_bridge *bridge)
>>   {
>>       struct analogix_dp_device *dp = bridge->driver_private;
>> +    int ret;
>>       if (dp->dpms_mode != DRM_MODE_DPMS_ON)
>>           return;
>> @@ -1077,6 +1156,10 @@ static void analogix_dp_bridge_disable(struct
>> drm_bridge *bridge)
>>       pm_runtime_put_sync(dp->dev);
>> +    ret = analogix_dp_prepare_panel(dp, false, true);
>> +    if (ret)
>> +        DRM_ERROR("failed to setup the panel ret = %d\n", ret);
>> +
>>       dp->dpms_mode = DRM_MODE_DPMS_OFF;
>>   }
>> @@ -1165,9 +1248,9 @@ static void analogix_dp_bridge_nop(struct
>> drm_bridge *bridge)
>>   }
>>   static const struct drm_bridge_funcs analogix_dp_bridge_funcs = {
>> +    .pre_enable = analogix_dp_bridge_pre_enable,
>>       .enable = analogix_dp_bridge_enable,
>>       .disable = analogix_dp_bridge_disable,
>> -    .pre_enable = analogix_dp_bridge_nop,
>>       .post_disable = analogix_dp_bridge_nop,
>>       .mode_set = analogix_dp_bridge_mode_set,
>>       .attach = analogix_dp_bridge_attach,
>> @@ -1254,6 +1337,9 @@ int analogix_dp_bind(struct device *dev, struct
>> drm_device *drm_dev,
>>       dp->dev = &pdev->dev;
>>       dp->dpms_mode = DRM_MODE_DPMS_OFF;
>> +    mutex_init(&dp->panel_lock);
>> +    dp->panel_is_modeset = false;
>> +
>>       /*
>>        * platform dp driver need containor_of the plat_data to get
>>        * the driver private data, so we need to store the point of
>> @@ -1333,13 +1419,6 @@ int analogix_dp_bind(struct device *dev, struct
>> drm_device *drm_dev,
>>       phy_power_on(dp->phy);
>> -    if (dp->plat_data->panel) {
>> -        if (drm_panel_prepare(dp->plat_data->panel)) {
>> -            DRM_ERROR("failed to setup the panel\n");
>> -            return -EBUSY;
>> -        }
>> -    }
>> -
>>       analogix_dp_init_dp(dp);
>>       ret = devm_request_threaded_irq(&pdev->dev, dp->irq,
>> diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.h
>> b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.h
>> index b456380..43108d7 100644
>> --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.h
>> +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.h
>> @@ -178,6 +178,9 @@ struct analogix_dp_device {
>>       bool                    force_hpd;
>>       unsigned char           edid[EDID_BLOCK_LENGTH * 2];
>> +    struct mutex        panel_lock;
>> +    bool            panel_is_modeset;
>> +
>>       struct analogix_dp_plat_data *plat_data;
>>   };
>
>

-- 
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project

[PATCH v1.1 2/2] drm/bridge: analogix_dp: turn off the panel when eDP need to disable

[Yakir Yang]

Some panels (like Sharp LQ123P1JX31) need to be turn off when eDP
controller stop to send valid video signal, otherwhise panel would
go burn in, and keep flicker and flicker.

So it's better to turn off the panel when eDP need to disable, and
we need to turn on the panel in connector->detect() callback, so
that driver would detect panel status rightly.

Signed-off-by: Yakir Yang <ykk@rock-chips.com>
---

Changes in v1.1:
- unprepare the panel at the end of bridge->disable() function

 drivers/gpu/drm/bridge/analogix/analogix_dp_core.c | 22 +++++++++++++++-------
 1 file changed, 15 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
index 32715da..2e519bd 100644
--- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
+++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
@@ -961,6 +961,14 @@ analogix_dp_detect(struct drm_connector *connector, bool force)
 {
 	struct analogix_dp_device *dp = to_dp(connector);
 
+	/*
+	 * Panle would prepare for several times here, but don't worry it
+	 * would only enable the hardware at the first prepare time.
+	 */
+	if (dp->plat_data->panel)
+		if (drm_panel_prepare(dp->plat_data->panel))
+			DRM_ERROR("failed to setup the panel\n");
+
 	if (analogix_dp_detect_hpd(dp))
 		return connector_status_disconnected;
 
@@ -1077,6 +1085,13 @@ static void analogix_dp_bridge_disable(struct drm_bridge *bridge)
 
 	pm_runtime_put_sync(dp->dev);
 
+	if (dp->plat_data->panel) {
+		if (drm_panel_unprepare(dp->plat_data->panel)) {
+			DRM_ERROR("failed to turnoff the panel\n");
+			return;
+		}
+	}
+
 	dp->dpms_mode = DRM_MODE_DPMS_OFF;
 }
 
@@ -1333,13 +1348,6 @@ int analogix_dp_bind(struct device *dev, struct drm_device *drm_dev,
 
 	phy_power_on(dp->phy);
 
-	if (dp->plat_data->panel) {
-		if (drm_panel_prepare(dp->plat_data->panel)) {
-			DRM_ERROR("failed to setup the panel\n");
-			return -EBUSY;
-		}
-	}
-
 	analogix_dp_init_dp(dp);
 
 	ret = devm_request_threaded_irq(&pdev->dev, dp->irq,
-- 
1.9.1

Re: [PATCH v1 1/2] drm/panel: simple-panel: add the delay timing for Sharp LQ123P1JX31

[Sean Paul]

On Thu, Jul 21, 2016 at 9:14 AM, Yakir Yang <ykk@rock-chips.com> wrote:
> According to page 16 of Sharp LQ123P1JX31 datasheet, we need to add the
> missing delay timing. Panel prepare time should be t1 (0.5ms~10ms) plus
> t3 (0ms~100ms), and panel enable time should equal to t7 (0ms~50ms), and
> panel unprepare time should be t11 (1ms~50ms) plus t12 (500ms~).
>
> Signed-off-by: Yakir Yang <ykk@rock-chips.com>

Reviewed-by: Sean Paul <seanpaul@chromium.org>

> ---
>  drivers/gpu/drm/panel/panel-simple.c | 5 +++++
>  1 file changed, 5 insertions(+)
>
> diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c
> index 85143d1..f178998 100644
> --- a/drivers/gpu/drm/panel/panel-simple.c
> +++ b/drivers/gpu/drm/panel/panel-simple.c
> @@ -1384,6 +1384,11 @@ static const struct panel_desc sharp_lq123p1jx31 = {
>                 .width = 259,
>                 .height = 173,
>         },
> +       .delay = {
> +               .prepare = 110,
> +               .enable = 50,
> +               .unprepare = 550,
> +       },
>  };
>
>  static const struct drm_display_mode shelly_sca07010_bfn_lnn_mode = {
> --
> 1.9.1
>
>

Re: [PATCH v1 1/2] drm/panel: simple-panel: add the delay timing for Sharp LQ123P1JX31

[Yakir Yang]

Sean,

On 07/21/2016 10:30 PM, Sean Paul wrote:
> On Thu, Jul 21, 2016 at 9:14 AM, Yakir Yang <ykk@rock-chips.com> wrote:
>> According to page 16 of Sharp LQ123P1JX31 datasheet, we need to add the
>> missing delay timing. Panel prepare time should be t1 (0.5ms~10ms) plus
>> t3 (0ms~100ms), and panel enable time should equal to t7 (0ms~50ms), and
>> panel unprepare time should be t11 (1ms~50ms) plus t12 (500ms~).
>>
>> Signed-off-by: Yakir Yang <ykk@rock-chips.com>
> Reviewed-by: Sean Paul <seanpaul@chromium.org>

Thanks  :-D

- Yakir

>> ---
>>   drivers/gpu/drm/panel/panel-simple.c | 5 +++++
>>   1 file changed, 5 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c
>> index 85143d1..f178998 100644
>> --- a/drivers/gpu/drm/panel/panel-simple.c
>> +++ b/drivers/gpu/drm/panel/panel-simple.c
>> @@ -1384,6 +1384,11 @@ static const struct panel_desc sharp_lq123p1jx31 = {
>>                  .width = 259,
>>                  .height = 173,
>>          },
>> +       .delay = {
>> +               .prepare = 110,
>> +               .enable = 50,
>> +               .unprepare = 550,
>> +       },
>>   };
>>
>>   static const struct drm_display_mode shelly_sca07010_bfn_lnn_mode = {
>> --
>> 1.9.1
>>
>>
>
>