arm64: tegra: Update AHUB clock parent and rate on Tegra234

I2S data sanity tests fail beyond a bit clock frequency of 6.144MHz.
This happens because the AHUB clock rate is too low and it shows
9.83MHz on boot.

The maximum rate of PLLA_OUT0 is 49.152MHz and is used to serve I/O
clocks. It is recommended that AHUB clock operates higher than this.
Thus fix this by using PLLP_OUT0 as parent clock for AHUB instead of
PLLA_OUT0 and fix the rate to 81.6MHz.

Fixes: dc94a94daa39 ("arm64: tegra: Add audio devices on Tegra234")
Cc: stable@vger.kernel.org
Signed-off-by: Sheetal <sheetal@nvidia.com>
Signed-off-by: Sameer Pujar <spujar@nvidia.com>
Reviewed-by: Mohan Kumar D <mkumard@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>

diff --git a/arch/arm64/boot/dts/nvidia/tegra234.dtsi b/arch/arm64/boot/dts/nvidia/tegra234.dtsi
index f4974e8..0f12a8d 100644 (file)
--- a/arch/arm64/boot/dts/nvidia/tegra234.dtsi
+++ b/arch/arm64/boot/dts/nvidia/tegra234.dtsi
@@ -180,7 +180,8 @@
                                clocks = <&bpmp TEGRA234_CLK_AHUB>;
                                clock-names = "ahub";
                                assigned-clocks = <&bpmp TEGRA234_CLK_AHUB>;
-                               assigned-clock-parents = <&bpmp TEGRA234_CLK_PLLA_OUT0>;
+                               assigned-clock-parents = <&bpmp TEGRA234_CLK_PLLP_OUT0>;
+                               assigned-clock-rates = <81600000>;
                                status = "disabled";
 
                                #address-cells = <2>;