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i2c: hisi: Avoid redundant interrupts

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[ Upstream commit cc9812a309 ]

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>
This commit is contained in:
Yicong Yang
2023-03-13 15:45:51 +08:00
committed by Greg Kroah-Hartman
parent d21a462120
commit 0f9d2fc588
1 changed files with 7 additions and 0 deletions
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7
drivers/i2c/busses/i2c-hisi.c
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@@ -315,6 +315,13 @@ 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)