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authorMax Filippov <jcmvbkbc@gmail.com>2009-04-06 01:03:09 +0400
committerJohn W. Linville <linville@tuxdriver.com>2009-04-23 00:54:41 +0400
commit87cbfd06889256cac945b37c7f62f4ce7f44b34a (patch)
tree28d07f98916908d2c436dc144b31d2fe267c72cb /drivers/net
parent6a362bb1c9f900f7e6daeee52ff2d538badae49b (diff)
downloadlinux-87cbfd06889256cac945b37c7f62f4ce7f44b34a.tar.xz
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')
-rw-r--r--drivers/net/wireless/p54/p54spi.c41
1 files changed, 14 insertions, 27 deletions
diff --git a/drivers/net/wireless/p54/p54spi.c b/drivers/net/wireless/p54/p54spi.c
index 52023127cf37..59a5e778bb08 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);