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bcm63xx: fix spi transfer handling

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* 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>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@34320 3c298f89-4303-0410-b956-a3cf2f4a3e73
This commit is contained in:
jogo
2012-11-24 14:19:09 +00:00
parent 08e2775c71
commit 4352c2858f
5 changed files with 619 additions and 3 deletions
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29
target/linux/brcm63xx/patches-3.3/109-bcm63xx-fix-transfer-bits_per_words-check.patch Normal file
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@@ -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);