[PATCH] board: zynqmp: Fix for wrong AMS setting by ROM

[Michal Simek]

pá 5. 6. 2020 v 10:09 odesílatel Michal Simek <michal.simek at xilinx.com> napsal:
>
> From: Mike Looijmans <mike.looijmans at topic.nl>
>
> A bug in the ZynqMP bootrom sets the PS_SYSMON_ANALOG_BUS register
> at 0xFFA50914 to the wrong value 0x3201. This causes the AMS to
> exchange the PS supply voltages 0 and 1. On Xilinx boards this is
> not noticeable since these are tied together, it's only really
> noticeable if banks 500 and 501 have different supplies. Xilinx' tech
> support reported this undocumented register to be the cause, and
> this patch applies a fix for all boards by programming the correct
> value.
>
> Signed-off-by: Mike Looijmans <mike.looijmans at topic.nl>
> Signed-off-by: Michal Simek <michal.simek at xilinx.com>
> ---
>
>  board/xilinx/zynqmp/zynqmp.c | 6 ++++++
>  1 file changed, 6 insertions(+)
>
> diff --git a/board/xilinx/zynqmp/zynqmp.c b/board/xilinx/zynqmp/zynqmp.c
> index cb72914adb3c..a6cd41af1a09 100644
> --- a/board/xilinx/zynqmp/zynqmp.c
> +++ b/board/xilinx/zynqmp/zynqmp.c
> @@ -359,6 +359,9 @@ static int multi_boot(void)
>         return 0;
>  }
>
> +#define PS_SYSMON_ANALOG_BUS_VAL       0x3210
> +#define PS_SYSMON_ANALOG_BUS_REG       0xFFA50914
> +
>  int board_init(void)
>  {
>  #if defined(CONFIG_ZYNQMP_FIRMWARE)
> @@ -378,6 +381,9 @@ int board_init(void)
>
>         printf("EL Level:\tEL%d\n", current_el());
>
> +       /* Bug in ROM sets wrong value in this register */
> +       writel(PS_SYSMON_ANALOG_BUS_VAL, PS_SYSMON_ANALOG_BUS_REG);
> +
>  #if defined(CONFIG_FPGA) && defined(CONFIG_FPGA_ZYNQMPPL) && \
>      !defined(CONFIG_SPL_BUILD) || (defined(CONFIG_SPL_FPGA_SUPPORT) && \
>      defined(CONFIG_SPL_BUILD))
> --
> 2.27.0
>

Applied.
M

-- 
Michal Simek, Ing. (M.Eng), OpenPGP -> KeyID: FE3D1F91
w: www.monstr.eu p: +42-0-721842854
Maintainer of Linux kernel - Xilinx Microblaze
Maintainer of Linux kernel - Xilinx Zynq ARM and ZynqMP ARM64 SoCs
U-Boot custodian - Xilinx Microblaze/Zynq/ZynqMP/Versal SoCs