linux-kernel - [PATCH v3 5/5] fpga manager: xilinx-spi: provide better diagnostics on programming failure

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Date:   Fri, 28 Aug 2020 21:58:08 +0200
From:   Luca Ceresoli <luca@...aceresoli.net>
To:     linux-fpga@...r.kernel.org
Cc:     Luca Ceresoli <luca@...aceresoli.net>,
        Moritz Fischer <mdf@...nel.org>, Tom Rix <trix@...hat.com>,
        Michal Simek <michal.simek@...inx.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Anatolij Gustschin <agust@...x.de>
Subject: [PATCH v3 5/5] 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.

Signed-off-by: Luca Ceresoli <luca@...aceresoli.net>

---

Changes in v3: none.

Changes in v2:
 - also check for gpiod_get_value() errors (Tom Rix)
---
 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 9488c8fbaefd..c2e0a42cd4f2 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;
 }
 
-- 
2.28.0