[PATCH v2 0/2] MediaTek MDP3: use devicetree to retrieve SCP

[PATCH v2 0/2] MediaTek MDP3: use devicetree to retrieve SCP

[AngeloGioacchino Del Regno]

Changes in v2:
 - Rebased over media_stage master as of 05/10/2023
 - Reworked description of mediatek,scp property in bindings
   - Dropped Conor's and Chen-Yu's R-b tags from bindings patch due
     to the description rework.

Especially now that Multi-Core SCP support has landed, it makes sense to
retrieve the SCP handle by using the "mediatek,scp" property (as already
done in MediaTek VCODEC), both to select one specific SCP core for MDP3
and to avoid walking the parent node to find a SCP node.

AngeloGioacchino Del Regno (2):
  media: dt-bindings: mediatek: Add phandle to mediatek,scp on MDP3 RDMA
  media: platform: mtk-mdp3: Use devicetree phandle to retrieve SCP

 .../bindings/media/mediatek,mdp3-rdma.yaml       |  8 ++++++++
 .../media/platform/mediatek/mdp3/mtk-mdp3-core.c | 16 ++++++++++------
 2 files changed, 18 insertions(+), 6 deletions(-)

-- 
2.42.0

[PATCH v2 1/2] media: dt-bindings: mediatek: Add phandle to mediatek,scp on MDP3 RDMA

[AngeloGioacchino Del Regno]

The MDP3 RDMA needs to communicate with the SCP remote processor: allow
specifying a phandle to a SCP core.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
---

v2: I've dropped Conor and Chen-Yu's Reviewed-by tags because I have changed
    the description (so, the patch actually changed a bit).

 .../devicetree/bindings/media/mediatek,mdp3-rdma.yaml     | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/Documentation/devicetree/bindings/media/mediatek,mdp3-rdma.yaml b/Documentation/devicetree/bindings/media/mediatek,mdp3-rdma.yaml
index 7032c7e15039..59dcea797b71 100644
--- a/Documentation/devicetree/bindings/media/mediatek,mdp3-rdma.yaml
+++ b/Documentation/devicetree/bindings/media/mediatek,mdp3-rdma.yaml
@@ -45,6 +45,14 @@ properties:
       include/dt-bindings/gce/<chip>-gce.h of each chips.
     $ref: /schemas/types.yaml#/definitions/uint32-array
 
+  mediatek,scp:
+    $ref: /schemas/types.yaml#/definitions/phandle
+    description:
+      Phandle to the System Control Processor (SCP) used for initializing
+      and stopping the MDP3, for sending frame data locations to the MDP3's
+      VPU and to install Inter-Processor Interrupt handlers to control
+      processing states.
+
   power-domains:
     maxItems: 1
 
-- 
2.42.0

[PATCH v2 2/2] media: platform: mtk-mdp3: Use devicetree phandle to retrieve SCP

[AngeloGioacchino Del Regno]

Instead of walking the entire parent node for something that has the
right compatible, use the scp_get() function provided by the MediaTek
SCP remoteproc driver to retrieve a handle to mtk_scp through the
devicetree "mediatek,scp" (phandle) property.

In case of multi-core SCP, this also allows to select a specific core.

Reviewed-by: Chen-Yu Tsai <wenst@chromium.org>
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
---
 .../media/platform/mediatek/mdp3/mtk-mdp3-core.c | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/drivers/media/platform/mediatek/mdp3/mtk-mdp3-core.c b/drivers/media/platform/mediatek/mdp3/mtk-mdp3-core.c
index cc44be10fdb7..94f4ed78523b 100644
--- a/drivers/media/platform/mediatek/mdp3/mtk-mdp3-core.c
+++ b/drivers/media/platform/mediatek/mdp3/mtk-mdp3-core.c
@@ -208,13 +208,17 @@ static int mdp_probe(struct platform_device *pdev)
 		goto err_destroy_job_wq;
 	}
 
-	mm_pdev = __get_pdev_by_id(pdev, MDP_INFRA_SCP);
-	if (WARN_ON(!mm_pdev)) {
-		dev_err(&pdev->dev, "Could not get scp device\n");
-		ret = -ENODEV;
-		goto err_destroy_clock_wq;
+	mdp->scp = scp_get(pdev);
+	if (!mdp->scp) {
+		mm_pdev = __get_pdev_by_id(pdev, MDP_INFRA_SCP);
+		if (WARN_ON(!mm_pdev)) {
+			dev_err(&pdev->dev, "Could not get scp device\n");
+			ret = -ENODEV;
+			goto err_destroy_clock_wq;
+		}
+		mdp->scp = platform_get_drvdata(mm_pdev);
 	}
-	mdp->scp = platform_get_drvdata(mm_pdev);
+
 	mdp->rproc_handle = scp_get_rproc(mdp->scp);
 	dev_dbg(&pdev->dev, "MDP rproc_handle: %pK", mdp->rproc_handle);
 
-- 
2.42.0

Re: [PATCH v2 1/2] media: dt-bindings: mediatek: Add phandle to mediatek,scp on MDP3 RDMA

[Conor Dooley]

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On Thu, Oct 05, 2023 at 12:49:04PM +0200, AngeloGioacchino Del Regno wrote:
> The MDP3 RDMA needs to communicate with the SCP remote processor: allow
> specifying a phandle to a SCP core.
> 
> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
> ---
> 
> v2: I've dropped Conor and Chen-Yu's Reviewed-by tags because I have changed
>     the description (so, the patch actually changed a bit).

I dunno, you made it more informative so you could probably have kept
mine at least.
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>

Thanks,
Conor.

> 
>  .../devicetree/bindings/media/mediatek,mdp3-rdma.yaml     | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/media/mediatek,mdp3-rdma.yaml b/Documentation/devicetree/bindings/media/mediatek,mdp3-rdma.yaml
> index 7032c7e15039..59dcea797b71 100644
> --- a/Documentation/devicetree/bindings/media/mediatek,mdp3-rdma.yaml
> +++ b/Documentation/devicetree/bindings/media/mediatek,mdp3-rdma.yaml
> @@ -45,6 +45,14 @@ properties:
>        include/dt-bindings/gce/<chip>-gce.h of each chips.
>      $ref: /schemas/types.yaml#/definitions/uint32-array
>  
> +  mediatek,scp:
> +    $ref: /schemas/types.yaml#/definitions/phandle
> +    description:
> +      Phandle to the System Control Processor (SCP) used for initializing
> +      and stopping the MDP3, for sending frame data locations to the MDP3's
> +      VPU and to install Inter-Processor Interrupt handlers to control
> +      processing states.
> +
>    power-domains:
>      maxItems: 1
>  
> -- 
> 2.42.0
> 

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Re: [PATCH v2 1/2] media: dt-bindings: mediatek: Add phandle to mediatek,scp on MDP3 RDMA

[Alexandre Mergnat]

Reviewed-by: Alexandre Mergnat <amergnat@baylibre.com>

On 05/10/2023 12:49, AngeloGioacchino Del Regno wrote:
> The MDP3 RDMA needs to communicate with the SCP remote processor: allow 
> specifying a phandle to a SCP core.

-- 
Regards,
Alexandre

Re: [PATCH v2 2/2] media: platform: mtk-mdp3: Use devicetree phandle to retrieve SCP

[Alexandre Mergnat]

Reviewed-by: Alexandre Mergnat <amergnat@baylibre.com>

On 05/10/2023 12:49, AngeloGioacchino Del Regno wrote:
> Instead of walking the entire parent node for something that has the 
> right compatible, use the scp_get() function provided by the MediaTek 
> SCP remoteproc driver to retrieve a handle to mtk_scp through the 
> devicetree "mediatek,scp" (phandle) property. In case of multi-core SCP, 
> this also allows to select a specific core.

-- 
Regards,
Alexandre

Re: [PATCH v2 1/2] media: dt-bindings: mediatek: Add phandle to mediatek,scp on MDP3 RDMA

[AngeloGioacchino Del Regno]

Il 06/10/23 01:36, Conor Dooley ha scritto:
> On Thu, Oct 05, 2023 at 12:49:04PM +0200, AngeloGioacchino Del Regno wrote:
>> The MDP3 RDMA needs to communicate with the SCP remote processor: allow
>> specifying a phandle to a SCP core.
>>
>> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
>> ---
>>
>> v2: I've dropped Conor and Chen-Yu's Reviewed-by tags because I have changed
>>      the description (so, the patch actually changed a bit).
> 
> I dunno, you made it more informative so you could probably have kept
> mine at least.
> Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
> 

I just wanted to be cautious with keeping Reviewed-by tags.

Sometimes it's better to drop than unfairly keeping, I'm sure that you
understand my point here.

Btw, thank you!

Cheers,
Angelo

> Thanks,
> Conor.
> 
>>
>>   .../devicetree/bindings/media/mediatek,mdp3-rdma.yaml     | 8 ++++++++
>>   1 file changed, 8 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/media/mediatek,mdp3-rdma.yaml b/Documentation/devicetree/bindings/media/mediatek,mdp3-rdma.yaml
>> index 7032c7e15039..59dcea797b71 100644
>> --- a/Documentation/devicetree/bindings/media/mediatek,mdp3-rdma.yaml
>> +++ b/Documentation/devicetree/bindings/media/mediatek,mdp3-rdma.yaml
>> @@ -45,6 +45,14 @@ properties:
>>         include/dt-bindings/gce/<chip>-gce.h of each chips.
>>       $ref: /schemas/types.yaml#/definitions/uint32-array
>>   
>> +  mediatek,scp:
>> +    $ref: /schemas/types.yaml#/definitions/phandle
>> +    description:
>> +      Phandle to the System Control Processor (SCP) used for initializing
>> +      and stopping the MDP3, for sending frame data locations to the MDP3's
>> +      VPU and to install Inter-Processor Interrupt handlers to control
>> +      processing states.
>> +
>>     power-domains:
>>       maxItems: 1
>>   
>> -- 
>> 2.42.0
>>
>>
>> _______________________________________________
>> Kernel mailing list -- kernel@mailman.collabora.com
>> To unsubscribe send an email to kernel-leave@mailman.collabora.com

Re: [PATCH v2 1/2] media: dt-bindings: mediatek: Add phandle to mediatek,scp on MDP3 RDMA

[Conor Dooley]

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On Wed, Oct 11, 2023 at 01:44:24PM +0200, AngeloGioacchino Del Regno wrote:
> Il 06/10/23 01:36, Conor Dooley ha scritto:
> > On Thu, Oct 05, 2023 at 12:49:04PM +0200, AngeloGioacchino Del Regno wrote:
> > > The MDP3 RDMA needs to communicate with the SCP remote processor: allow
> > > specifying a phandle to a SCP core.
> > > 
> > > Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
> > > ---
> > > 
> > > v2: I've dropped Conor and Chen-Yu's Reviewed-by tags because I have changed
> > >      the description (so, the patch actually changed a bit).
> > 
> > I dunno, you made it more informative so you could probably have kept
> > mine at least.
> > Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
> > 
> 
> I just wanted to be cautious with keeping Reviewed-by tags.
> 
> Sometimes it's better to drop than unfairly keeping, I'm sure that you
> understand my point here.

Oh aye, I do... And you did call out having dropped the tag, so I
appreciate that too.

> Btw, thank you!

nw chief

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