target/linux/brcm63xx/patches-3.10/055-spi-bcm63xx-don-t-reject-reads-256-bytes.patch

   1 From 4d8fa9d3d1fe1d70fe7d59537acf49797f6010a1 Mon Sep 17 00:00:00 2001
   2 From: Jonas Gorski <jogo@openwrt.org>
   3 Date: Sun, 1 Dec 2013 16:19:46 +0100
   4 Subject: [PATCH 2/2] spi/bcm63xx: don't reject reads >= 256 bytes
   5
   6 The rx_tail register is only 8 bit wide, so it will wrap around
   7 after 256 read bytes. This makes it rather meaningless, so drop any
   8 usage of it to not treat reads over 256 as failed.
   9
  10 Signed-off-by: Jonas Gorski <jogo@openwrt.org>
  11 ---
  12  drivers/spi/spi-bcm63xx.c | 8 +-------
  13  1 file changed, 1 insertion(+), 7 deletions(-)
  14
  15 --- a/drivers/spi/spi-bcm63xx.c
  16 +++ b/drivers/spi/spi-bcm63xx.c
  17 @@ -214,13 +214,7 @@ static int bcm63xx_txrx_bufs(struct spi_
  18         if (!timeout)
  19                 return -ETIMEDOUT;
  20
  21 -       /* read out all data */
  22 -       rx_tail = bcm_spi_readb(bs, SPI_RX_TAIL);
  23 -
  24 -       if (do_rx && rx_tail != len)
  25 -               return -EIO;
  26 -
  27 -       if (!rx_tail)
  28 +       if (!do_rx)
  29                 return 0;
  30
  31         len = 0;