diff options
Diffstat (limited to 'drivers/i2c/busses/i2c-hisi.c')
| -rw-r--r-- | drivers/i2c/busses/i2c-hisi.c | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/drivers/i2c/busses/i2c-hisi.c b/drivers/i2c/busses/i2c-hisi.c index 8c6c7075c765..e067671b3ce2 100644 --- a/drivers/i2c/busses/i2c-hisi.c +++ b/drivers/i2c/busses/i2c-hisi.c @@ -316,6 +316,13 @@ static void hisi_i2c_xfer_msg(struct hisi_i2c_controller *ctlr) max_write == 0) break; } + + /* + * Disable the TX_EMPTY interrupt after finishing all the messages to + * avoid overwhelming the CPU. + */ + if (ctlr->msg_tx_idx == ctlr->msg_num) + hisi_i2c_disable_int(ctlr, HISI_I2C_INT_TX_EMPTY); } static irqreturn_t hisi_i2c_irq(int irq, void *context) @@ -341,7 +348,11 @@ static irqreturn_t hisi_i2c_irq(int irq, void *context) hisi_i2c_read_rx_fifo(ctlr); out: - if (int_stat & HISI_I2C_INT_TRANS_CPLT || ctlr->xfer_err) { + /* + * Only use TRANS_CPLT to indicate the completion. On error cases we'll + * get two interrupts, INT_ERR first then TRANS_CPLT. + */ + if (int_stat & HISI_I2C_INT_TRANS_CPLT) { hisi_i2c_disable_int(ctlr, HISI_I2C_INT_ALL); hisi_i2c_clear_int(ctlr, HISI_I2C_INT_ALL); complete(ctlr->completion); |