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Nguyen" , Phong Vo , openbmc@lists.ozlabs.org Errors-To: openbmc-bounces+openbmc=archiver.kernel.org@lists.ozlabs.org Sender: "openbmc" Slave i2c device on AST2500 received a lot of slave irq while it is busy processing the response. To handle this case, adds and exports aspeed_set_slave_busy() for controller to temporary stop slave irq while slave is handling the response, and re-enable them again when the response is ready. Signed-off-by: Quan Nguyen --- v3: + First introduce in v3 [Quan] drivers/i2c/busses/i2c-aspeed.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/drivers/i2c/busses/i2c-aspeed.c b/drivers/i2c/busses/i2c-aspeed.c index b2e9c8f0ddf7..9926d04831a2 100644 --- a/drivers/i2c/busses/i2c-aspeed.c +++ b/drivers/i2c/busses/i2c-aspeed.c @@ -944,6 +944,26 @@ static int aspeed_i2c_init(struct aspeed_i2c_bus *bus, return 0; } +#if IS_ENABLED(CONFIG_I2C_SLAVE) +void aspeed_set_slave_busy(struct i2c_adapter *adap, bool busy) +{ + struct aspeed_i2c_bus *bus = i2c_get_adapdata(adap); + unsigned long current_mask, flags; + + spin_lock_irqsave(&bus->lock, flags); + + current_mask = readl(bus->base + ASPEED_I2C_INTR_CTRL_REG); + if (busy) + current_mask &= ~(ASPEED_I2CD_INTR_RX_DONE | ASPEED_I2CD_INTR_SLAVE_MATCH); + else + current_mask |= ASPEED_I2CD_INTR_RX_DONE | ASPEED_I2CD_INTR_SLAVE_MATCH; + writel(current_mask, bus->base + ASPEED_I2C_INTR_CTRL_REG); + + spin_unlock_irqrestore(&bus->lock, flags); +} +EXPORT_SYMBOL_GPL(aspeed_set_slave_busy); +#endif + static int aspeed_i2c_reset(struct aspeed_i2c_bus *bus) { struct platform_device *pdev = to_platform_device(bus->dev); -- 2.28.0