linux-kernel - [PATCH 4.14 76/91] fpga-manager: altera-ps-spi: preserve nCONFIG state

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Date:   Mon, 30 Apr 2018 12:24:58 -0700
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Anatolij Gustschin <agust@...x.de>,
        Alan Tull <atull@...nel.org>, Moritz Fischer <mdf@...nel.org>
Subject: [PATCH 4.14 76/91] fpga-manager: altera-ps-spi: preserve nCONFIG state

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

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

commit 881c93c0fb73328845898344208fa0bf0d62cac6 upstream.

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>
Cc: stable <stable@...r.kernel.org> # 4.14+
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/fpga/altera-ps-spi.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- 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_de
 
 	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));