diff mbox series

[v8,09/34] dt-bindings: host1x: Document Memory Client resets of Host1x, GR2D and GR3D

Message ID 20210817012754.8710-10-digetx@gmail.com
State New
Headers show
Series NVIDIA Tegra power management patches for 5.16 | expand

Commit Message

Dmitry Osipenko Aug. 17, 2021, 1:27 a.m. UTC
Memory Client should be blocked before hardware reset is asserted in order
to prevent memory corruption and hanging of memory controller.

Document Memory Client resets of Host1x, GR2D and GR3D hardware units.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
---
 .../bindings/display/tegra/nvidia,tegra20-host1x.txt          | 4 ++++
 1 file changed, 4 insertions(+)

Comments

Rob Herring (Arm) Aug. 18, 2021, 1:16 a.m. UTC | #1
On Tue, Aug 17, 2021 at 04:27:29AM +0300, Dmitry Osipenko wrote:
> Memory Client should be blocked before hardware reset is asserted in order
> to prevent memory corruption and hanging of memory controller.
> 
> Document Memory Client resets of Host1x, GR2D and GR3D hardware units.
> 
> Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
> ---
>  .../bindings/display/tegra/nvidia,tegra20-host1x.txt          | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/display/tegra/nvidia,tegra20-host1x.txt b/Documentation/devicetree/bindings/display/tegra/nvidia,tegra20-host1x.txt
> index 62861a8fb5c6..07a08653798b 100644
> --- a/Documentation/devicetree/bindings/display/tegra/nvidia,tegra20-host1x.txt
> +++ b/Documentation/devicetree/bindings/display/tegra/nvidia,tegra20-host1x.txt
> @@ -18,6 +18,7 @@ Required properties:
>  - resets: Must contain an entry for each entry in reset-names.
>    See ../reset/reset.txt for details.
>  - reset-names: Must include the following entries:
> +  - mc
>    - host1x

New entries should be at the end. Order matters.

>  
>  Optional properties:
> @@ -197,6 +198,7 @@ of the following host1x client modules:
>    - resets: Must contain an entry for each entry in reset-names.
>      See ../reset/reset.txt for details.
>    - reset-names: Must include the following entries:
> +    - mc
>      - 2d
>  
>    Optional properties:
> @@ -222,6 +224,8 @@ of the following host1x client modules:
>    - resets: Must contain an entry for each entry in reset-names.
>      See ../reset/reset.txt for details.
>    - reset-names: Must include the following entries:
> +    - mc
> +    - mc2 (Only required on SoCs with two 3D clocks)
>      - 3d
>      - 3d2 (Only required on SoCs with two 3D clocks)
>  
> -- 
> 2.32.0
> 
>
Dmitry Osipenko Aug. 18, 2021, 1:37 a.m. UTC | #2
18.08.2021 04:16, Rob Herring пишет:
> On Tue, Aug 17, 2021 at 04:27:29AM +0300, Dmitry Osipenko wrote:
>> Memory Client should be blocked before hardware reset is asserted in order
>> to prevent memory corruption and hanging of memory controller.
>>
>> Document Memory Client resets of Host1x, GR2D and GR3D hardware units.
>>
>> Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
>> ---
>>  .../bindings/display/tegra/nvidia,tegra20-host1x.txt          | 4 ++++
>>  1 file changed, 4 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/display/tegra/nvidia,tegra20-host1x.txt b/Documentation/devicetree/bindings/display/tegra/nvidia,tegra20-host1x.txt
>> index 62861a8fb5c6..07a08653798b 100644
>> --- a/Documentation/devicetree/bindings/display/tegra/nvidia,tegra20-host1x.txt
>> +++ b/Documentation/devicetree/bindings/display/tegra/nvidia,tegra20-host1x.txt
>> @@ -18,6 +18,7 @@ Required properties:
>>  - resets: Must contain an entry for each entry in reset-names.
>>    See ../reset/reset.txt for details.
>>  - reset-names: Must include the following entries:
>> +  - mc
>>    - host1x
> 
> New entries should be at the end. Order matters.

Indeed, order matters. In this case it matters by the hardware because
memory reset must be asserted before the controller's reset. We rely on
it in the code of the GENPD driver. Hence it's the intended order in
this patch.
Dmitry Osipenko Aug. 18, 2021, 2:04 a.m. UTC | #3
18.08.2021 04:37, Dmitry Osipenko пишет:
> 18.08.2021 04:16, Rob Herring пишет:
>> On Tue, Aug 17, 2021 at 04:27:29AM +0300, Dmitry Osipenko wrote:
>>> Memory Client should be blocked before hardware reset is asserted in order
>>> to prevent memory corruption and hanging of memory controller.
>>>
>>> Document Memory Client resets of Host1x, GR2D and GR3D hardware units.
>>>
>>> Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
>>> ---
>>>  .../bindings/display/tegra/nvidia,tegra20-host1x.txt          | 4 ++++
>>>  1 file changed, 4 insertions(+)
>>>
>>> diff --git a/Documentation/devicetree/bindings/display/tegra/nvidia,tegra20-host1x.txt b/Documentation/devicetree/bindings/display/tegra/nvidia,tegra20-host1x.txt
>>> index 62861a8fb5c6..07a08653798b 100644
>>> --- a/Documentation/devicetree/bindings/display/tegra/nvidia,tegra20-host1x.txt
>>> +++ b/Documentation/devicetree/bindings/display/tegra/nvidia,tegra20-host1x.txt
>>> @@ -18,6 +18,7 @@ Required properties:
>>>  - resets: Must contain an entry for each entry in reset-names.
>>>    See ../reset/reset.txt for details.
>>>  - reset-names: Must include the following entries:
>>> +  - mc
>>>    - host1x
>>
>> New entries should be at the end. Order matters.
> 
> Indeed, order matters. In this case it matters by the hardware because
> memory reset must be asserted before the controller's reset. We rely on
> it in the code of the GENPD driver. Hence it's the intended order in
> this patch.
> 

Although, my bad. It should be to reorder items here, it's not a GENPD
binding.
diff mbox series

Patch

diff --git a/Documentation/devicetree/bindings/display/tegra/nvidia,tegra20-host1x.txt b/Documentation/devicetree/bindings/display/tegra/nvidia,tegra20-host1x.txt
index 62861a8fb5c6..07a08653798b 100644
--- a/Documentation/devicetree/bindings/display/tegra/nvidia,tegra20-host1x.txt
+++ b/Documentation/devicetree/bindings/display/tegra/nvidia,tegra20-host1x.txt
@@ -18,6 +18,7 @@  Required properties:
 - resets: Must contain an entry for each entry in reset-names.
   See ../reset/reset.txt for details.
 - reset-names: Must include the following entries:
+  - mc
   - host1x
 
 Optional properties:
@@ -197,6 +198,7 @@  of the following host1x client modules:
   - resets: Must contain an entry for each entry in reset-names.
     See ../reset/reset.txt for details.
   - reset-names: Must include the following entries:
+    - mc
     - 2d
 
   Optional properties:
@@ -222,6 +224,8 @@  of the following host1x client modules:
   - resets: Must contain an entry for each entry in reset-names.
     See ../reset/reset.txt for details.
   - reset-names: Must include the following entries:
+    - mc
+    - mc2 (Only required on SoCs with two 3D clocks)
     - 3d
     - 3d2 (Only required on SoCs with two 3D clocks)