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brcm63xx: fix legacy spi tranfers >= 256 bytes

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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
This commit is contained in:
Jonas Gorski 2014-01-13 12:11:58 +00:00
parent f08f0cafc2
commit af7e570c3b
2 changed files with 57 additions and 0 deletions
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26
target/linux/brcm63xx/patches-3.10/054-spi-bcm63xx-don-t-substract-prepend-length-from-tota.patch Normal file
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@ -0,0 +1,26 @@
From e85583b12b023773b488cf8406f11719a4037461 Mon Sep 17 00:00:00 2001
From: Jonas Gorski <jogo@openwrt.org>
Date: Sun, 1 Dec 2013 16:16:44 +0100
Subject: [PATCH 1/2] spi/bcm63xx: don't substract prepend length from total
length
The spi command must include the full message length including any
prepended writes, else transfers larger than 256 bytes will be
incomplete.
Signed-off-by: Jonas Gorski <jogo@openwrt.org>
---
drivers/spi/spi-bcm63xx.c | 2 --
1 file changed, 2 deletions(-)
--- a/drivers/spi/spi-bcm63xx.c
+++ b/drivers/spi/spi-bcm63xx.c
@@ -180,8 +180,6 @@ static int bcm63xx_txrx_bufs(struct spi_
transfer_list);
}
- len -= prepend_len;
-
init_completion(&bs->done);
/* Fill in the Message control register */

31
target/linux/brcm63xx/patches-3.10/055-spi-bcm63xx-don-t-reject-reads-256-bytes.patch Normal file
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@ -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;