arm64: dts: qcom: sc8280xp: add missing PCIe minimum OPP

BugLink: https://bugs.launchpad.net/bugs/2070337

commit 8b8ec83a1d7d3b6605d9163d2e306971295a4ce8 upstream.

Add the missing PCIe CX performance level votes to avoid relying on
other drivers (e.g. USB or UFS) to maintain the nominal performance
level required for Gen3 speeds.

Fixes: 813e831570 ("arm64: dts: qcom: sc8280xp/sa8540p: add PCIe2-4 nodes")
Cc: stable@vger.kernel.org      # 6.2
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Link: https://lore.kernel.org/r/20240306095651.4551-5-johan+linaro@kernel.org
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Manuel Diewald <manuel.diewald@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>

arch/arm64/boot/dts/qcom/sc8280xp.dtsi

@@ -1774,6 +1774,7 @@
 			reset-names = "pci";
 
 			power-domains = <&gcc PCIE_4_GDSC>;
+			required-opps = <&rpmhpd_opp_nom>;
 
 			phys = <&pcie4_phy>;
 			phy-names = "pciephy";
@@ -1872,6 +1873,7 @@
 			reset-names = "pci";
 
 			power-domains = <&gcc PCIE_3B_GDSC>;
+			required-opps = <&rpmhpd_opp_nom>;
 
 			phys = <&pcie3b_phy>;
 			phy-names = "pciephy";
@@ -1970,6 +1972,7 @@
 			reset-names = "pci";
 
 			power-domains = <&gcc PCIE_3A_GDSC>;
+			required-opps = <&rpmhpd_opp_nom>;
 
 			phys = <&pcie3a_phy>;
 			phy-names = "pciephy";
@@ -2071,6 +2074,7 @@
 			reset-names = "pci";
 
 			power-domains = <&gcc PCIE_2B_GDSC>;
+			required-opps = <&rpmhpd_opp_nom>;
 
 			phys = <&pcie2b_phy>;
 			phy-names = "pciephy";
@@ -2169,6 +2173,7 @@
 			reset-names = "pci";
 
 			power-domains = <&gcc PCIE_2A_GDSC>;
+			required-opps = <&rpmhpd_opp_nom>;
 
 			phys = <&pcie2a_phy>;
 			phy-names = "pciephy";