diff options
Diffstat (limited to 'drivers/i2c')
| -rw-r--r-- | drivers/i2c/busses/i2c-uniphier-f.c | 17 |
1 files changed, 14 insertions, 3 deletions
diff --git a/drivers/i2c/busses/i2c-uniphier-f.c b/drivers/i2c/busses/i2c-uniphier-f.c index dd384743dbbd..fad2b00a8c8c 100644 --- a/drivers/i2c/busses/i2c-uniphier-f.c +++ b/drivers/i2c/busses/i2c-uniphier-f.c @@ -173,8 +173,6 @@ static irqreturn_t uniphier_fi2c_interrupt(int irq, void *dev_id) "interrupt: enabled_irqs=%04x, irq_status=%04x\n", priv->enabled_irqs, irq_status); - uniphier_fi2c_clear_irqs(priv, irq_status); - if (irq_status & UNIPHIER_FI2C_INT_STOP) goto complete; @@ -214,7 +212,13 @@ static irqreturn_t uniphier_fi2c_interrupt(int irq, void *dev_id) if (irq_status & (UNIPHIER_FI2C_INT_RF | UNIPHIER_FI2C_INT_RB)) { uniphier_fi2c_drain_rxfifo(priv); - if (!priv->len) + /* + * If the number of bytes to read is multiple of the FIFO size + * (msg->len == 8, 16, 24, ...), the INT_RF bit is set a little + * earlier than INT_RB. We wait for INT_RB to confirm the + * completion of the current message. + */ + if (!priv->len && (irq_status & UNIPHIER_FI2C_INT_RB)) goto data_done; if (unlikely(priv->flags & UNIPHIER_FI2C_MANUAL_NACK)) { @@ -253,6 +257,13 @@ complete: } handled: + /* + * This controller makes a pause while any bit of the IRQ status is + * asserted. Clear the asserted bit to kick the controller just before + * exiting the handler. + */ + uniphier_fi2c_clear_irqs(priv, irq_status); + spin_unlock(&priv->lock); return IRQ_HANDLED; |