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| author | Max Filippov <jcmvbkbc@gmail.com> | 2009-04-06 01:03:09 +0400 |
|---|---|---|
| committer | John W. Linville <linville@tuxdriver.com> | 2009-04-22 16:54:41 -0400 |
| commit | 87cbfd06889256cac945b37c7f62f4ce7f44b34a (patch) | |
| tree | 28d07f98916908d2c436dc144b31d2fe267c72cb /drivers/net/wireless/p54/p54spi.c | |
| parent | 6a362bb1c9f900f7e6daeee52ff2d538badae49b (diff) | |
| download | kernel_samsung_smdk4412-87cbfd06889256cac945b37c7f62f4ce7f44b34a.zip kernel_samsung_smdk4412-87cbfd06889256cac945b37c7f62f4ce7f44b34a.tar.gz kernel_samsung_smdk4412-87cbfd06889256cac945b37c7f62f4ce7f44b34a.tar.bz2 | |
p54spi: get rid of busy-wait loops
p54spi_wakeup and p54spi_tx_frame used busy-waiting loop
to poll for 'ready' bits in SPI_ADRS_HOST_INTERRUPTS register.
With this change in place 'WR_READY timeout' messages do not
show anymore.
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Acked-by: Christian Lamparter <chunkeey@web.de>
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 | 41 |
1 files changed, 14 insertions, 27 deletions
diff --git a/drivers/net/wireless/p54/p54spi.c b/drivers/net/wireless/p54/p54spi.c index 5202312..59a5e77 100644 --- a/drivers/net/wireless/p54/p54spi.c +++ b/drivers/net/wireless/p54/p54spi.c @@ -167,14 +167,13 @@ static const struct p54spi_spi_reg p54spi_registers_array[] = static int p54spi_wait_bit(struct p54s_priv *priv, u16 reg, __le32 bits) { int i; - __le32 buffer; for (i = 0; i < 2000; i++) { - p54spi_spi_read(priv, reg, &buffer, sizeof(buffer)); + __le32 buffer = p54spi_read32(priv, reg); if ((buffer & bits) == bits) return 1; - msleep(1); + msleep(0); } return 0; } @@ -185,10 +184,10 @@ static int p54spi_spi_write_dma(struct p54s_priv *priv, __le32 base, 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)) == 0) { + 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 " - "to DMA write."); + "to DMA write.\n"); return -EAGAIN; } @@ -330,21 +329,15 @@ static inline void p54spi_int_ack(struct p54s_priv *priv, u32 val) static void p54spi_wakeup(struct p54s_priv *priv) { - unsigned long timeout; - u32 ints; - /* wake the chip */ p54spi_write32(priv, SPI_ADRS_ARM_INTERRUPTS, cpu_to_le32(SPI_TARGET_INT_WAKEUP)); /* And wait for the READY interrupt */ - timeout = jiffies + HZ; - - ints = p54spi_read32(priv, SPI_ADRS_HOST_INTERRUPTS); - while (!(ints & SPI_HOST_INT_READY)) { - if (time_after(jiffies, timeout)) - goto out; - ints = p54spi_read32(priv, SPI_ADRS_HOST_INTERRUPTS); + if (!p54spi_wait_bit(priv, SPI_ADRS_HOST_INTERRUPTS, + cpu_to_le32(SPI_HOST_INT_READY))) { + dev_err(&priv->spi->dev, "INT_READY timeout\n"); + goto out; } p54spi_int_ack(priv, SPI_HOST_INT_READY); @@ -432,9 +425,7 @@ static irqreturn_t p54spi_interrupt(int irq, void *config) static int p54spi_tx_frame(struct p54s_priv *priv, struct sk_buff *skb) { struct p54_hdr *hdr = (struct p54_hdr *) skb->data; - unsigned long timeout; int ret = 0; - u32 ints; p54spi_wakeup(priv); @@ -442,15 +433,11 @@ static int p54spi_tx_frame(struct p54s_priv *priv, struct sk_buff *skb) if (ret < 0) goto out; - timeout = jiffies + 2 * HZ; - ints = p54spi_read32(priv, SPI_ADRS_HOST_INTERRUPTS); - while (!(ints & SPI_HOST_INT_WR_READY)) { - if (time_after(jiffies, timeout)) { - dev_err(&priv->spi->dev, "WR_READY timeout\n"); - ret = -1; - goto out; - } - ints = p54spi_read32(priv, SPI_ADRS_HOST_INTERRUPTS); + if (!p54spi_wait_bit(priv, SPI_ADRS_HOST_INTERRUPTS, + cpu_to_le32(SPI_HOST_INT_WR_READY))) { + dev_err(&priv->spi->dev, "WR_READY timeout\n"); + ret = -1; + goto out; } p54spi_int_ack(priv, SPI_HOST_INT_WR_READY); |