[PATCH 10/11] socfpga: arria10: Wait for fifo empty after writing bitstream
Paweł Anikiel
pan at semihalf.com
Fri Apr 1 14:43:24 CEST 2022
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(+)
diff --git a/drivers/fpga/socfpga_arria10.c b/drivers/fpga/socfpga_arria10.c
index 07bfe3060e..d8089122af 100644
--- a/drivers/fpga/socfpga_arria10.c
+++ b/drivers/fpga/socfpga_arria10.c
@@ -80,6 +80,13 @@ static int wait_for_user_mode(void)
1, FPGA_TIMEOUT_MSEC, false);
}
+static int wait_for_fifo_empty(void)
+{
+ return wait_for_bit_le32(&fpga_manager_base->imgcfg_stat,
+ ALT_FPGAMGR_IMGCFG_STAT_F2S_IMGCFG_FIFOEMPTY_SET_MSK,
+ 1, FPGA_TIMEOUT_MSEC, false);
+}
+
int is_fpgamgr_early_user_mode(void)
{
return (readl(&fpga_manager_base->imgcfg_stat) &
@@ -874,6 +881,7 @@ int socfpga_loadfs(fpga_fs_info *fpga_fsinfo, const void *buf, size_t bsize,
WATCHDOG_RESET();
}
+ wait_for_fifo_empty();
if (fpga_loadfs.rbfinfo.section == periph_section) {
if (fpgamgr_wait_early_user_mode() != -ETIMEDOUT) {
--
2.35.1.1094.g7c7d902a7c-goog
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