diff options
| author | Yicong Yang <yangyicong@hisilicon.com> | 2023-03-13 15:45:51 +0800 |
|---|---|---|
| committer | Wolfram Sang <wsa@kernel.org> | 2023-03-16 21:00:47 +0100 |
| commit | cc9812a3096d1986caca9a23bee99effc45c08df (patch) | |
| tree | 1c60609d4f594ba24d334cbcf9e16a285833834e /drivers/i2c/busses/i2c-hisi.c | |
| parent | 5190417bdf72c71b65bd9892103c6186816a6e8b (diff) | |
| download | linux-stable-cc9812a3096d1986caca9a23bee99effc45c08df.tar.gz linux-stable-cc9812a3096d1986caca9a23bee99effc45c08df.tar.bz2 linux-stable-cc9812a3096d1986caca9a23bee99effc45c08df.zip | |
i2c: hisi: Avoid redundant interrupts
After issuing all the messages we can disable the TX_EMPTY interrupts
to avoid handling redundant interrupts. For doing a sinlge bus
detection (i2cdetect -y -r 0) we can reduce ~97% interrupts (before
~12000 after ~400).
Signed-off-by: Sheng Feng <fengsheng5@huawei.com>
Signed-off-by: Yicong Yang <yangyicong@hisilicon.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
Diffstat (limited to 'drivers/i2c/busses/i2c-hisi.c')
| -rw-r--r-- | drivers/i2c/busses/i2c-hisi.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/i2c/busses/i2c-hisi.c b/drivers/i2c/busses/i2c-hisi.c index 8c6c7075c765..1b7609a34f4a 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) |