[PATCH v2 10/11] socfpga: arria10: Wait for fifo empty after writing bitstream

[Simon Glass]

On Thu, 26 May 2022 at 07:38, Paweł Anikiel <pan at semihalf.com> wrote:
>
> For some reason, on the Mercury+ AA1 module, calling
> fpgamgr_wait_early_user_mode immediately after writing the peripheral
> bitstream leaves the fpga in a broken state (ddr calibration hangs).
> Adding a delay before the first sync word is written seems to fix this.
> Inspecting the fpgamgr registers before and after the delay,
> imgcfg_FifoEmpty is the only bit that changes. Waiting for this bit
> (instead of a hardcoded delay) also fixes the issue.
>
> Signed-off-by: Paweł Anikiel <pan at semihalf.com>
> ---
>  drivers/fpga/socfpga_arria10.c | 8 ++++++++
>  1 file changed, 8 insertions(+)

Reviewed-by: Simon Glass <sjg at chromium.org>