> -----Original Message-----
> From: openbmc
> <openbmc-bounces+ryan_chen=aspeedtech....@lists.ozlabs.org> On Behalf
> Of Quan Nguyen
> Sent: Wednesday, May 19, 2021 3:50 PM
> To: Corey Minyard <miny...@acm.org>; Rob Herring <robh...@kernel.org>;
> Joel Stanley <j...@jms.id.au>; Andrew Jeffery <and...@aj.id.au>; Brendan
> Higgins <brendanhigg...@google.com>; Benjamin Herrenschmidt
> <b...@kernel.crashing.org>; Wolfram Sang <w...@kernel.org>; Philipp Zabel
> <p.za...@pengutronix.de>; openipmi-developer@lists.sourceforge.net;
> devicet...@vger.kernel.org; linux-arm-ker...@lists.infradead.org;
> linux-asp...@lists.ozlabs.org; linux-ker...@vger.kernel.org;
> linux-...@vger.kernel.org
> Cc: Open Source Submission <patc...@amperecomputing.com>; Thang Q .
> Nguyen <th...@os.amperecomputing.com>; Phong Vo
> <ph...@os.amperecomputing.com>; open...@lists.ozlabs.org
> Subject: [PATCH v3 5/7] i2c: aspeed: Add aspeed_set_slave_busy()
>
> 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 <q...@os.amperecomputing.com>
> ---
> 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);
Hello
Where the bus->base to be remap?
> + 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
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