The main reason is to send pmufw cfg overlay from U-Boot to PMUFW to enable access to DP. Overlay is sent when cls command is called and for that IP has to be enabled in carrier cards. And IP needs to be also enabled in SOM dt because with DTB reselection new DT is not parsed in pre reloc U-Boot instance. It is called from board_f via embedded_dtb_select(). That's why bind function is not able to allocate memory and it ends up with error: "Video device 'display@fd4a0000' cannot allocate frame buffer memory -ensure the device is set up before relocation"
To avoid this situation DP is placed also to SOM where bind function is called and frame buffer memory is allocated and just reused after DTB reselection. Result is the same. There could be a problem in Linux with different DP configurations but that's need to be solved there because console should be on from u-boot already.
Signed-off-by: Michal Simek michal.simek@xilinx.com ---
arch/arm/dts/zynqmp-sck-kv-g-revB.dts | 2 +- arch/arm/dts/zynqmp-sm-k26-revA.dts | 4 ++++ 2 files changed, 5 insertions(+), 1 deletion(-)
diff --git a/arch/arm/dts/zynqmp-sck-kv-g-revB.dts b/arch/arm/dts/zynqmp-sck-kv-g-revB.dts index 6ea950a13f45..28a3f3c21992 100644 --- a/arch/arm/dts/zynqmp-sck-kv-g-revB.dts +++ b/arch/arm/dts/zynqmp-sck-kv-g-revB.dts @@ -92,7 +92,7 @@ };
&zynqmp_dpsub { - status = "disabled"; + status = "okay"; phy-names = "dp-phy0", "dp-phy1"; phys = <&psgtr 1 PHY_TYPE_DP 0 0>, <&psgtr 0 PHY_TYPE_DP 1 0>; assigned-clock-rates = <27000000>, <25000000>, <300000000>; diff --git a/arch/arm/dts/zynqmp-sm-k26-revA.dts b/arch/arm/dts/zynqmp-sm-k26-revA.dts index e9baf4cb4148..d242f8712b84 100644 --- a/arch/arm/dts/zynqmp-sm-k26-revA.dts +++ b/arch/arm/dts/zynqmp-sm-k26-revA.dts @@ -317,3 +317,7 @@ &ams_pl { status = "okay"; }; + +&zynqmp_dpsub { + status = "okay"; +};