From: Max Filippov Date: Sun, 17 May 2009 23:02:31 +0000 (+0400) Subject: p54spi: fix incorrect access sequence to DMA_WRITE_CTRL in p54spi_spi_write_dma X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=210dd1bb9b0329bcc1b4f8932022eddc6466980c;p=linux-beck.git 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 Signed-off-by: John W. Linville --- 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);