From 4e772ab86b3ee24a936b10a291ce31c1f0c2bbb4 Mon Sep 17 00:00:00 2001 From: Luca Ceresoli Date: Sun, 30 Aug 2020 18:38:50 +0200 Subject: [PATCH] fpga manager: xilinx-spi: provide better diagnostics on programming failure When the DONE pin does not go high after programming to confirm programming success, the INIT_B pin provides some info on the reason. Use it if available to provide a more explanatory error message. Reviewed-by: Tom Rix Signed-off-by: Luca Ceresoli Signed-off-by: Moritz Fischer --- drivers/fpga/xilinx-spi.c | 16 +++++++++++++++- 1 file changed, 15 insertions(+), 1 deletion(-) diff --git a/drivers/fpga/xilinx-spi.c b/drivers/fpga/xilinx-spi.c index 52aab5a1f0ba..824abbbd631e 100644 --- a/drivers/fpga/xilinx-spi.c +++ b/drivers/fpga/xilinx-spi.c @@ -195,7 +195,21 @@ static int xilinx_spi_write_complete(struct fpga_manager *mgr, return 0; } - dev_err(&mgr->dev, "Timeout after config data transfer\n"); + if (conf->init_b) { + ret = gpiod_get_value(conf->init_b); + + if (ret < 0) { + dev_err(&mgr->dev, "Error reading INIT_B (%d)\n", ret); + return ret; + } + + dev_err(&mgr->dev, + ret ? "CRC error or invalid device\n" + : "Missing sync word or incomplete bitstream\n"); + } else { + dev_err(&mgr->dev, "Timeout after config data transfer\n"); + } + return -ETIMEDOUT; }