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| author | Max Filippov <jcmvbkbc@gmail.com> | 2009-05-18 03:02:31 +0400 |
|---|---|---|
| committer | John W. Linville <linville@tuxdriver.com> | 2009-05-20 14:46:27 -0400 |
| commit | 210dd1bb9b0329bcc1b4f8932022eddc6466980c (patch) | |
| tree | 44319367ae3caf7059374242c3b79bc63a05d10e /drivers/net/wireless/p54/p54spi.c | |
| parent | 4eaf16bc1f92bf772f6d42860e86b399d00b7b94 (diff) | |
| download | blackbird-op-linux-210dd1bb9b0329bcc1b4f8932022eddc6466980c.tar.gz blackbird-op-linux-210dd1bb9b0329bcc1b4f8932022eddc6466980c.zip | |
p54spi: fix incorrect access sequence to DMA_WRITE_CTRL in p54spi_spi_write_dma
Host is not allowed to modify DMA_WRITE_CTRL register
if bit HOST_ALLOWED in it is not set. Wait for HOST_ALLOWED first.
Also get rid of timeout in p54spi_wait_bit as it's been playing
a role of workaround for such an incorrect register access.
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'drivers/net/wireless/p54/p54spi.c')
| -rw-r--r-- | drivers/net/wireless/p54/p54spi.c | 8 |
1 files changed, 3 insertions, 5 deletions
diff --git a/drivers/net/wireless/p54/p54spi.c b/drivers/net/wireless/p54/p54spi.c index 59a5e778bb08..272b7e176afc 100644 --- a/drivers/net/wireless/p54/p54spi.c +++ b/drivers/net/wireless/p54/p54spi.c @@ -172,8 +172,6 @@ static int p54spi_wait_bit(struct p54s_priv *priv, u16 reg, __le32 bits) __le32 buffer = p54spi_read32(priv, reg); if ((buffer & bits) == bits) return 1; - - msleep(0); } return 0; } @@ -181,9 +179,6 @@ static int p54spi_wait_bit(struct p54s_priv *priv, u16 reg, __le32 bits) static int p54spi_spi_write_dma(struct p54s_priv *priv, __le32 base, const void *buf, size_t len) { - p54spi_write16(priv, SPI_ADRS_DMA_WRITE_CTRL, - cpu_to_le16(SPI_DMA_WRITE_CTRL_ENABLE)); - if (!p54spi_wait_bit(priv, SPI_ADRS_DMA_WRITE_CTRL, cpu_to_le32(HOST_ALLOWED))) { dev_err(&priv->spi->dev, "spi_write_dma not allowed " @@ -191,6 +186,9 @@ static int p54spi_spi_write_dma(struct p54s_priv *priv, __le32 base, return -EAGAIN; } + p54spi_write16(priv, SPI_ADRS_DMA_WRITE_CTRL, + cpu_to_le16(SPI_DMA_WRITE_CTRL_ENABLE)); + p54spi_write16(priv, SPI_ADRS_DMA_WRITE_LEN, cpu_to_le16(len)); p54spi_write32(priv, SPI_ADRS_DMA_WRITE_BASE, base); p54spi_spi_write(priv, SPI_ADRS_DMA_DATA, buf, len); |
