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authorJonas Gorski <jogo@openwrt.org>2014-01-13 12:11:58 +0000
committerJonas Gorski <jogo@openwrt.org>2014-01-13 12:11:58 +0000
commitaf7e570c3b63d414533aaf179ef0cbc5b620ec6f (patch)
treeeb2b95743987920923e5c673a875476ab1b79937 /target/linux/brcm63xx/patches-3.10/055-spi-bcm63xx-don-t-reject-reads-256-bytes.patch
parentf08f0cafc24619242853e3fe11e2e5876c498551 (diff)
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brcm63xx: fix legacy spi tranfers >= 256 bytes
Fixes e.g. SPI flash access on BCM6358/BCM6368. Transfers < 256 bytes are not affected. Signed-off-by: Jonas Gorski <jogo@openwrt.org> SVN-Revision: 39265
Diffstat (limited to 'target/linux/brcm63xx/patches-3.10/055-spi-bcm63xx-don-t-reject-reads-256-bytes.patch')
-rw-r--r--target/linux/brcm63xx/patches-3.10/055-spi-bcm63xx-don-t-reject-reads-256-bytes.patch31
1 files changed, 31 insertions, 0 deletions
diff --git a/target/linux/brcm63xx/patches-3.10/055-spi-bcm63xx-don-t-reject-reads-256-bytes.patch b/target/linux/brcm63xx/patches-3.10/055-spi-bcm63xx-don-t-reject-reads-256-bytes.patch
new file mode 100644
index 0000000000..cf83c7b7b7
--- /dev/null
+++ b/target/linux/brcm63xx/patches-3.10/055-spi-bcm63xx-don-t-reject-reads-256-bytes.patch
@@ -0,0 +1,31 @@
+From 4d8fa9d3d1fe1d70fe7d59537acf49797f6010a1 Mon Sep 17 00:00:00 2001
+From: Jonas Gorski <jogo@openwrt.org>
+Date: Sun, 1 Dec 2013 16:19:46 +0100
+Subject: [PATCH 2/2] spi/bcm63xx: don't reject reads >= 256 bytes
+
+The rx_tail register is only 8 bit wide, so it will wrap around
+after 256 read bytes. This makes it rather meaningless, so drop any
+usage of it to not treat reads over 256 as failed.
+
+Signed-off-by: Jonas Gorski <jogo@openwrt.org>
+---
+ drivers/spi/spi-bcm63xx.c | 8 +-------
+ 1 file changed, 1 insertion(+), 7 deletions(-)
+
+--- a/drivers/spi/spi-bcm63xx.c
++++ b/drivers/spi/spi-bcm63xx.c
+@@ -214,13 +214,7 @@ static int bcm63xx_txrx_bufs(struct spi_
+ if (!timeout)
+ return -ETIMEDOUT;
+
+- /* read out all data */
+- rx_tail = bcm_spi_readb(bs, SPI_RX_TAIL);
+-
+- if (do_rx && rx_tail != len)
+- return -EIO;
+-
+- if (!rx_tail)
++ if (!do_rx)
+ return 0;
+
+ len = 0;