From: Michael Brown <mcb30@etherboot.org>
Date: Sat, 28 Jul 2007 15:05:41 +0000 (+0100)
Subject: Ensure clock line is in the idle state before asserting chip select.
X-Git-Tag: v0.9.3~160
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ca41159f577ba787d52005af850380259690f933;p=thirdparty%2Fipxe.git

Ensure clock line is in the idle state before asserting chip select.
---

diff --git a/src/drivers/bitbash/spi_bit.c b/src/drivers/bitbash/spi_bit.c
index e2175d603..a4e7136f8 100644
--- a/src/drivers/bitbash/spi_bit.c
+++ b/src/drivers/bitbash/spi_bit.c
@@ -153,6 +153,10 @@ static int spi_bit_rw ( struct spi_bus *bus, struct spi_device *device,
 		= container_of ( bus, struct spi_bit_basher, bus );
 	uint32_t tmp;
 
+	/* Set clock line to idle state */
+	write_bit ( &spibit->basher, SPI_BIT_SCLK, 
+		    ( bus->mode & SPI_MODE_CPOL ) );
+
 	/* Assert chip select on specified slave */
 	spi_bit_set_slave_select ( spibit, device->slave, SELECT_SLAVE );