Messages in this thread | | | Subject | Re: [PATCH v3 5/7] i2c: aspeed: Add aspeed_set_slave_busy() | From | Quan Nguyen <> | Date | Mon, 24 May 2021 17:20:01 +0700 |
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On 24/05/2021 17:06, Ryan Chen wrote: >> -----Original Message----- >> From: openbmc >> <openbmc-bounces+ryan_chen=aspeedtech.com@lists.ozlabs.org> On Behalf >> Of Quan Nguyen >> Sent: Wednesday, May 19, 2021 3:50 PM >> To: Corey Minyard <minyard@acm.org>; Rob Herring <robh+dt@kernel.org>; >> Joel Stanley <joel@jms.id.au>; Andrew Jeffery <andrew@aj.id.au>; Brendan >> Higgins <brendanhiggins@google.com>; Benjamin Herrenschmidt >> <benh@kernel.crashing.org>; Wolfram Sang <wsa@kernel.org>; Philipp Zabel >> <p.zabel@pengutronix.de>; openipmi-developer@lists.sourceforge.net; >> devicetree@vger.kernel.org; linux-arm-kernel@lists.infradead.org; >> linux-aspeed@lists.ozlabs.org; linux-kernel@vger.kernel.org; >> linux-i2c@vger.kernel.org >> Cc: Open Source Submission <patches@amperecomputing.com>; Thang Q . >> Nguyen <thang@os.amperecomputing.com>; Phong Vo >> <phong@os.amperecomputing.com>; openbmc@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 <quan@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? >
Hi Ryan,
In "[PATCH v3 6/7] ipmi: ssif_bmc: Add Aspeed SSIF BMC driver", the ->priv is retrieved by calling i2c_get_adapdata(client->adapter). And in aspeed_set_ssif_bmc_status(), call the exported aspeed_set_slave_busy() using ->priv pointer as code below.
+extern void aspeed_set_slave_busy(struct i2c_adapter *adap, bool busy); +static void aspeed_set_ssif_bmc_status(struct ssif_bmc_ctx *ssif_bmc, unsigned int status) +{ + if (status & SSIF_BMC_BUSY) + aspeed_set_slave_busy((struct i2c_adapter *)ssif_bmc->priv, true); + else if (status & SSIF_BMC_READY) + aspeed_set_slave_busy((struct i2c_adapter *)ssif_bmc->priv, false); +} + +static int ssif_bmc_probe(struct i2c_client *client, const struct i2c_device_id *id) +{ + struct ssif_bmc_ctx *ssif_bmc; + + ssif_bmc = ssif_bmc_alloc(client, 0); + if (IS_ERR(ssif_bmc)) + return PTR_ERR(ssif_bmc); + + ssif_bmc->priv = i2c_get_adapdata(client->adapter); + ssif_bmc->set_ssif_bmc_status = aspeed_set_ssif_bmc_status; + + return 0; +}
- Quan
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