From: Bo Shen <voice.s...@atmel.com>
As the i2c-at91 driver won't work in the interrupt mode,
so need to poll the interrupts.
Signed-off-by: Bo Shen <voice.s...@atmel.com>
---
drivers/i2c/busses/i2c-at91.c | 38 +++++++++++++++++++++++---------------
1 file changed, 23 insertions(+), 15 deletions(-)
diff --git a/drivers/i2c/busses/i2c-at91.c b/drivers/i2c/busses/i2c-at91.c
index 651cfc7..e62f1db 100644
--- a/drivers/i2c/busses/i2c-at91.c
+++ b/drivers/i2c/busses/i2c-at91.c
@@ -174,24 +174,32 @@ static void at91_twi_read_next_byte(struct at91_twi_dev
*dev)
static int at91_twi_wait_completion(struct at91_twi_dev *dev)
{
uint64_t start = get_time_ns();
- unsigned int status = at91_twi_read(dev, AT91_TWI_SR);
- unsigned int irqstatus = at91_twi_read(dev, AT91_TWI_IMR);
+ unsigned int status;
+ unsigned int irqstatus;
+
+ do {
+ status = at91_twi_read(dev, AT91_TWI_SR);
+ irqstatus = at91_twi_read(dev, AT91_TWI_IMR);
+
+ if (!(status & irqstatus)) {
+ if (is_timeout(start, AT91_I2C_TIMEOUT)) {
+ dev_warn(&dev->adapter.dev, "timeout waiting
for bus ready\n");
+ return -ETIMEDOUT;
+ } else {
+ continue;
+ }
+ }
- if (irqstatus & AT91_TWI_RXRDY)
- at91_twi_read_next_byte(dev);
- else if (irqstatus & AT91_TWI_TXRDY)
- at91_twi_write_next_byte(dev);
- else
- dev_warn(&dev->adapter.dev, "neither rx and tx are ready\n");
+ if (irqstatus & AT91_TWI_RXRDY)
+ at91_twi_read_next_byte(dev);
+ else if (irqstatus & AT91_TWI_TXRDY)
+ at91_twi_write_next_byte(dev);
+ else
+ dev_warn(&dev->adapter.dev, "neither rx and tx are
ready\n");
- dev->transfer_status |= status;
+ dev->transfer_status |= status;
- while (!(at91_twi_read(dev, AT91_TWI_SR) & AT91_TWI_TXCOMP)) {
- if (is_timeout(start, AT91_I2C_TIMEOUT)) {
- dev_warn(&dev->adapter.dev, "timeout waiting for bus
ready\n");
- return -ETIMEDOUT;
- }
- }
+ } while (!(at91_twi_read(dev, AT91_TWI_SR) & AT91_TWI_TXCOMP));
at91_disable_twi_interrupts(dev);
--
1.7.9.5
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