This is a note to let you know that I've just added the patch titled
fpga-manager: altera-ps-spi: preserve nCONFIG state
to my char-misc git tree which can be found at git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git in the char-misc-linus branch.
The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.)
The patch will hopefully also be merged in Linus's tree for the next -rc kernel release.
If you have any questions about this process, please let me know.
From 881c93c0fb73328845898344208fa0bf0d62cac6 Mon Sep 17 00:00:00 2001
From: Anatolij Gustschin agust@denx.de Date: Sun, 15 Apr 2018 11:33:08 -0700 Subject: fpga-manager: altera-ps-spi: preserve nCONFIG state
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@denx.de Acked-by: Alan Tull atull@kernel.org Signed-off-by: Moritz Fischer mdf@kernel.org Cc: stable stable@vger.kernel.org # 4.14+ Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- 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));