Messages in this thread Patch in this message | | | From | Sasha Levin <> | Subject | [PATCH AUTOSEL 6.1 09/24] i2c: hisi: Avoid redundant interrupts | Date | Fri, 31 Mar 2023 21:42:25 -0400 |
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From: Yicong Yang <yangyicong@hisilicon.com>
[ Upstream commit cc9812a3096d1986caca9a23bee99effc45c08df ]
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> Signed-off-by: Sasha Levin <sashal@kernel.org> --- drivers/i2c/busses/i2c-hisi.c | 7 +++++++ 1 file changed, 7 insertions(+)
diff --git a/drivers/i2c/busses/i2c-hisi.c b/drivers/i2c/busses/i2c-hisi.c index d30071f299879..8a61bee745a16 100644 --- a/drivers/i2c/busses/i2c-hisi.c +++ b/drivers/i2c/busses/i2c-hisi.c @@ -314,6 +314,13 @@ 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) -- 2.39.2
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