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 17:48:38 +0700 |
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On 24/05/2021 17:36, Ryan Chen wrote: >> -----Original Message----- >> From: Quan Nguyen <quan@os.amperecomputing.com> >> Sent: Monday, May 24, 2021 6:20 PM >> To: Ryan Chen <ryan_chen@aspeedtech.com>; 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: Re: [PATCH v3 5/7] i2c: aspeed: Add aspeed_set_slave_busy() >> >> 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. >> > Yes, I see the probe function " ssif_bmc->priv = i2c_get_adapdata(client->adapter);" to get priv. > But my question I don’t see the bus->base address be assigned. > Hi Ryan,
In drivers/i2c/busses/i2c-aspeed.c: struct aspeed_i2c_bus { struct i2c_adapter adap; struct device *dev; void __iomem *base; struct reset_control *rst; /* Synchronizes I/O mem access to base. */ spinlock_t lock;
So when "struct aspeed_i2c_bus *bus = i2c_get_adapdata(adap);", the bus->base should point to the base of the aspeed_i2c_bus, which is already initialized by the aspeed i2c bus driver.
Do I miss something?
- Quan
>> +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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