bcm63xx: fix spi transfer handling

* Accept transfers without bits_per_word set.

* Work around the inability of the hardware of keeping CS asserted.

Signed-off-by: Jonas Gorski <jogo@openwrt.org>

SVN-Revision: 34320

1 files changed, 29 insertions, 0 deletions

diff --git a/target/linux/brcm63xx/patches-3.6/106-bcm63xx-fix-transfer-bits_per_words-check.patch b/target/linux/brcm63xx/patches-3.6/106-bcm63xx-fix-transfer-bits_per_words-check.patch
new file mode 100644
index 0000000000..37d9d49d6f
--- /dev/null
+++ b/target/linux/brcm63xx/patches-3.6/106-bcm63xx-fix-transfer-bits_per_words-check.patch
@@ -0,0 +1,29 @@
+From fbef4dff80be6254e36ab5b9c655d248a3991ded Mon Sep 17 00:00:00 2001
+From: Jonas Gorski <jonas.gorski@gmail.com>
+Date: Sat, 24 Nov 2012 12:08:22 +0100
+Subject: [PATCH 3.7] spi/bcm63xx: fix transfer bits_per_words check
+
+Transfers often do not have bits_per_words set, so use the spi device's
+bits_per_words in this case.
+
+This fixes the driver rejecting valid transfers e.g. generated by
+spi_write() or spi_read().
+
+Cc: stable@vger.kernel.org
+Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>
+---
+ drivers/spi/spi-bcm63xx.c |    3 ++-
+ 1 file changed, 2 insertions(+), 1 deletion(-)
+
+--- a/drivers/spi/spi-bcm63xx.c
++++ b/drivers/spi/spi-bcm63xx.c
+@@ -103,7 +103,8 @@ static int bcm63xx_spi_check_transfer(st
+ {
+ 	u8 bits_per_word;
+ 
+-	bits_per_word = (t) ? t->bits_per_word : spi->bits_per_word;
++	bits_per_word = (t && t->bits_per_word) ?
++			t->bits_per_word : spi->bits_per_word;
+ 	if (bits_per_word != 8) {
+ 		dev_err(&spi->dev, "%s, unsupported bits_per_word=%d\n",
+ 			__func__, bits_per_word);