[PATCH] dt-bindings: phy: qcom,sc8280xp-qmp-pcie-phy: Fix X1E80100 resets entries

[PATCH] dt-bindings: phy: qcom,sc8280xp-qmp-pcie-phy: Fix X1E80100 resets entries

[Abel Vesa]

The PCIe 6a PHY on X1E80100 uses both resets in 4-lanes mode as well.
So fix the resets entries for it by adding the Gen4 4-lanes compatible
alongside the 2-lanes one.

Fixes: 0c5f4d23f776 ("dt-bindings: phy: qcom,sc8280xp-qmp-pcie-phy: Document the X1E80100 QMP PCIe PHY Gen4 x4")
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202410182029.n2zPkuGx-lkp@intel.com/
Signed-off-by: Abel Vesa <abel.vesa@linaro.org>
---
 Documentation/devicetree/bindings/phy/qcom,sc8280xp-qmp-pcie-phy.yaml | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Documentation/devicetree/bindings/phy/qcom,sc8280xp-qmp-pcie-phy.yaml b/Documentation/devicetree/bindings/phy/qcom,sc8280xp-qmp-pcie-phy.yaml
index dcf4fa55fbba58e162e5c7bebd40170342039172..b5bb665503c86c79940031bcb58a36a833918a4e 100644
--- a/Documentation/devicetree/bindings/phy/qcom,sc8280xp-qmp-pcie-phy.yaml
+++ b/Documentation/devicetree/bindings/phy/qcom,sc8280xp-qmp-pcie-phy.yaml
@@ -201,6 +201,7 @@ allOf:
               - qcom,sm8550-qmp-gen4x2-pcie-phy
               - qcom,sm8650-qmp-gen4x2-pcie-phy
               - qcom,x1e80100-qmp-gen4x2-pcie-phy
+              - qcom,x1e80100-qmp-gen4x4-pcie-phy
     then:
       properties:
         resets:

---
base-commit: d61a00525464bfc5fe92c6ad713350988e492b88
change-id: 20241018-phy-qcom-qmp-pcie-fix-x1e80100-gen4x4-resets-f1b41b935750

Best regards,
-- 
Abel Vesa <abel.vesa@linaro.org>

Re: [PATCH] dt-bindings: phy: qcom,sc8280xp-qmp-pcie-phy: Fix X1E80100 resets entries

[Johan Hovold]

On Fri, Oct 18, 2024 at 04:37:36PM +0300, Abel Vesa wrote:
> The PCIe 6a PHY on X1E80100 uses both resets in 4-lanes mode as well.

Again, this is a bit misleading as PCIe6a is using the
'qcom,x1e80100-qmp-gen4x4-pcie-phy' compatible in both 4-lane and 2-lane
mode even if the original dtsi got this wrong.

PCIe6b will be using 'qcom,x1e80100-qmp-gen4x2-pcie-phy' as that one is
a 2-lane PHY.

Perhaps you can rephrase this so that it doesn't sound like you are
using compatibles to configure PCIe6a?

> So fix the resets entries for it by adding the Gen4 4-lanes compatible
> alongside the 2-lanes one.
> 
> Fixes: 0c5f4d23f776 ("dt-bindings: phy: qcom,sc8280xp-qmp-pcie-phy: Document the X1E80100 QMP PCIe PHY Gen4 x4")
> Reported-by: kernel test robot <lkp@intel.com>
> Closes: https://lore.kernel.org/oe-kbuild-all/202410182029.n2zPkuGx-lkp@intel.com/
> Signed-off-by: Abel Vesa <abel.vesa@linaro.org>

Patch itself looks good.

Johan

Re: [PATCH] dt-bindings: phy: qcom,sc8280xp-qmp-pcie-phy: Fix X1E80100 resets entries

[Abel Vesa]

On 24-10-21 09:33:20, Johan Hovold wrote:
> On Fri, Oct 18, 2024 at 04:37:36PM +0300, Abel Vesa wrote:
> > The PCIe 6a PHY on X1E80100 uses both resets in 4-lanes mode as well.
> 
> Again, this is a bit misleading as PCIe6a is using the
> 'qcom,x1e80100-qmp-gen4x4-pcie-phy' compatible in both 4-lane and 2-lane
> mode even if the original dtsi got this wrong.

But the lane config within the phy driver differs based on the
compatible.

> 
> PCIe6b will be using 'qcom,x1e80100-qmp-gen4x2-pcie-phy' as that one is
> a 2-lane PHY.

Wouldn't the PCIe6a also have to switch to gen4x2 compatible on a board
where PCIe6b is used?

> 
> Perhaps you can rephrase this so that it doesn't sound like you are
> using compatibles to configure PCIe6a?

But currently we do configure PCIe6a based on compatibles.

What am I missing ?

> 
> > So fix the resets entries for it by adding the Gen4 4-lanes compatible
> > alongside the 2-lanes one.
> > 
> > Fixes: 0c5f4d23f776 ("dt-bindings: phy: qcom,sc8280xp-qmp-pcie-phy: Document the X1E80100 QMP PCIe PHY Gen4 x4")
> > Reported-by: kernel test robot <lkp@intel.com>
> > Closes: https://lore.kernel.org/oe-kbuild-all/202410182029.n2zPkuGx-lkp@intel.com/
> > Signed-off-by: Abel Vesa <abel.vesa@linaro.org>
> 
> Patch itself looks good.
> 
> Johan

Re: [PATCH] dt-bindings: phy: qcom,sc8280xp-qmp-pcie-phy: Fix X1E80100 resets entries

[Johan Hovold]

On Mon, Oct 21, 2024 at 11:53:31AM +0300, Abel Vesa wrote:
> On 24-10-21 09:33:20, Johan Hovold wrote:
> > On Fri, Oct 18, 2024 at 04:37:36PM +0300, Abel Vesa wrote:
> > > The PCIe 6a PHY on X1E80100 uses both resets in 4-lanes mode as well.
> > 
> > Again, this is a bit misleading as PCIe6a is using the
> > 'qcom,x1e80100-qmp-gen4x4-pcie-phy' compatible in both 4-lane and 2-lane
> > mode even if the original dtsi got this wrong.
> 
> But the lane config within the phy driver differs based on the
> compatible.

No, it differs based on the value of the TCSR register.

> > PCIe6b will be using 'qcom,x1e80100-qmp-gen4x2-pcie-phy' as that one is
> > a 2-lane PHY.
> 
> Wouldn't the PCIe6a also have to switch to gen4x2 compatible on a board
> where PCIe6b is used?

Nope, it stays the same (e.g. as the hardware block is the same).

> > Perhaps you can rephrase this so that it doesn't sound like you are
> > using compatibles to configure PCIe6a?
> 
> But currently we do configure PCIe6a based on compatibles.
> 
> What am I missing ?

No, as we've discussed in multiple threads already:

	https://lore.kernel.org/all/ZwPDxd9JJbgDeJTi@hovoldconsulting.com/	
	https://lore.kernel.org/lkml/ZtG2dUVkdwBpBbix@hovoldconsulting.com/

Johan

Re: [PATCH] dt-bindings: phy: qcom,sc8280xp-qmp-pcie-phy: Fix X1E80100 resets entries

[Abel Vesa]

On 24-10-21 10:59:54, Johan Hovold wrote:
> On Mon, Oct 21, 2024 at 11:53:31AM +0300, Abel Vesa wrote:
> > On 24-10-21 09:33:20, Johan Hovold wrote:
> > > On Fri, Oct 18, 2024 at 04:37:36PM +0300, Abel Vesa wrote:
> > > > The PCIe 6a PHY on X1E80100 uses both resets in 4-lanes mode as well.
> > > 
> > > Again, this is a bit misleading as PCIe6a is using the
> > > 'qcom,x1e80100-qmp-gen4x4-pcie-phy' compatible in both 4-lane and 2-lane
> > > mode even if the original dtsi got this wrong.
> > 
> > But the lane config within the phy driver differs based on the
> > compatible.
> 
> No, it differs based on the value of the TCSR register.

Yep, realized that now. Thanks for confirming.

> 
> > > PCIe6b will be using 'qcom,x1e80100-qmp-gen4x2-pcie-phy' as that one is
> > > a 2-lane PHY.
> > 
> > Wouldn't the PCIe6a also have to switch to gen4x2 compatible on a board
> > where PCIe6b is used?
> 
> Nope, it stays the same (e.g. as the hardware block is the same).
> 
> > > Perhaps you can rephrase this so that it doesn't sound like you are
> > > using compatibles to configure PCIe6a?
> > 
> > But currently we do configure PCIe6a based on compatibles.
> > 
> > What am I missing ?
> 
> No, as we've discussed in multiple threads already:
> 
> 	https://lore.kernel.org/all/ZwPDxd9JJbgDeJTi@hovoldconsulting.com/	
> 	https://lore.kernel.org/lkml/ZtG2dUVkdwBpBbix@hovoldconsulting.com/
> 
> Johan

Re: [PATCH] dt-bindings: phy: qcom,sc8280xp-qmp-pcie-phy: Fix X1E80100 resets entries

[Krzysztof Kozlowski]

On Fri, Oct 18, 2024 at 04:37:36PM +0300, Abel Vesa wrote:
> The PCIe 6a PHY on X1E80100 uses both resets in 4-lanes mode as well.
> So fix the resets entries for it by adding the Gen4 4-lanes compatible
> alongside the 2-lanes one.


Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>

Best regards,
Krzysztof