linux-kernel - [PATCH] fpga-manager: altera-ps-spi: preserve nCONFIG state

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Date:   Sun, 15 Apr 2018 11:33:08 -0700
From:   Moritz Fischer <mdf@...nel.org>
To:     gregkh@...uxfoundation.org
Cc:     atull@...nel.org, linux-fpga@...r.kernel.org,
        linux-kernel@...r.kernel.org, Anatolij Gustschin <agust@...x.de>,
        Moritz Fischer <mdf@...nel.org>
Subject: [PATCH] fpga-manager: altera-ps-spi: preserve nCONFIG state

From: Anatolij Gustschin <agust@...x.de>

If the driver module is loaded when FPGA is configured, the FPGA
is reset because nconfig is pulled low (low-active gpio inited
with GPIOD_OUT_HIGH activates the signal which means setting its
value to low). Init nconfig with GPIOD_OUT_LOW to prevent this.

Signed-off-by: Anatolij Gustschin <agust@...x.de>
Acked-by: Alan Tull <atull@...nel.org>
Signed-off-by: Moritz Fischer <mdf@...nel.org>
---

Hi Greg,

as discussed. Can you please take this bugfix for 4.17?
I rebased it against next.

Thanks,

Moritz

PS: Sorry for late submission
---
 drivers/fpga/altera-ps-spi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/fpga/altera-ps-spi.c b/drivers/fpga/altera-ps-spi.c
index 14f14efdf0d5..06d212a3d49d 100644
--- a/drivers/fpga/altera-ps-spi.c
+++ b/drivers/fpga/altera-ps-spi.c
@@ -249,7 +249,7 @@ static int altera_ps_probe(struct spi_device *spi)
 
 	conf->data = of_id->data;
 	conf->spi = spi;
-	conf->config = devm_gpiod_get(&spi->dev, "nconfig", GPIOD_OUT_HIGH);
+	conf->config = devm_gpiod_get(&spi->dev, "nconfig", GPIOD_OUT_LOW);
 	if (IS_ERR(conf->config)) {
 		dev_err(&spi->dev, "Failed to get config gpio: %ld\n",
 			PTR_ERR(conf->config));
-- 
2.17.0