Commit cc9812a3 authored by Yicong Yang's avatar Yicong Yang Committed by Wolfram Sang
Browse files

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: default avatarSheng Feng <fengsheng5@huawei.com>
Signed-off-by: default avatarYicong Yang <yangyicong@hisilicon.com>
Signed-off-by: default avatarWolfram Sang <wsa@kernel.org>
parent 5190417b

drivers/i2c/busses/i2c-hisi.c

+7 −0
Original line number Diff line number Diff line
@@ -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)