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b=xjOrwuzEpJIw9OV4ElOfBYWMuXA76REMA/FtMmSileIn8GGDIkRPADMOUES2INQJVS00aCIEhY7EW9LMplupqP8p74K75Y/MtW7IDvm9U1iHdcZjBXf4hMyRTydmbyp1GSQwqQfIkYYSd8U7RdSbU+v01PEuVzAWGbarFI6PUk0= Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=amd.com; Received: from LV5PR12MB9779.namprd12.prod.outlook.com (2603:10b6:408:301::14) by CH3PR12MB9729.namprd12.prod.outlook.com (2603:10b6:610:253::20) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.21.181.8; Thu, 2 Jul 2026 06:35:22 +0000 Received: from LV5PR12MB9779.namprd12.prod.outlook.com ([fe80::8ac8:e862:8ae9:9287]) by LV5PR12MB9779.namprd12.prod.outlook.com ([fe80::8ac8:e862:8ae9:9287%3]) with mapi id 15.21.0181.008; Thu, 2 Jul 2026 06:35:22 +0000 Message-ID: <5a1ef110-dbf9-4537-a542-9739a6ab0733@amd.com> Date: Thu, 2 Jul 2026 08:35:16 +0200 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 2/2] i2c: cadence: Add support for Axiado AX3000 To: Swark Yang , Andi Shyti , Rob Herring , Krzysztof Kozlowski , Conor Dooley Cc: linux-arm-kernel@lists.infradead.org, linux-i2c@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, openbmc@lists.ozlabs.org References: <20260630-axiado-ax3000-cadence-i2c-support-v3-0-4e217cfe5904@axiado.com> <20260630-axiado-ax3000-cadence-i2c-support-v3-2-4e217cfe5904@axiado.com> Content-Language: en-US From: Michal Simek Autocrypt: addr=michal.simek@amd.com; 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This allows the controller to support > I2C_FUNC_SMBUS_QUICK, enabling features such as bus scanning > via quick write commands. > > Additionally, enabling SMBus Quick emulation in the I2C core exposes > the controller to potential 0-length reads. Because the Cadence IP > does not natively support 0-length reads (writing 0 to the transfer > size register leaves the hardware in an unsupported state), this patch > also populates the adapter quirks with I2C_AQ_NO_ZERO_LEN_READ. nit: Avoid "this patch". Just use ", populate ..." > This ensures 0-length reads are safely rejected by the core, preventing > potential bus hangs. > > Signed-off-by: Swark Yang > --- > drivers/i2c/busses/i2c-cadence.c | 23 +++++++++++++++++++++++ > 1 file changed, 23 insertions(+) > > diff --git a/drivers/i2c/busses/i2c-cadence.c b/drivers/i2c/busses/i2c-cadence.c > index 0fb728ade92e..1964ea1650c5 100644 > --- a/drivers/i2c/busses/i2c-cadence.c > +++ b/drivers/i2c/busses/i2c-cadence.c > @@ -128,6 +128,7 @@ > #define CDNS_I2C_TIMEOUT_MAX 0xFF > > #define CDNS_I2C_BROKEN_HOLD_BIT BIT(0) > +#define CDNS_I2C_ENABLE_SMBUS_QUICK BIT(1) > #define CDNS_I2C_POLL_US 100000 > #define CDNS_I2C_POLL_US_ATOMIC 10 > #define CDNS_I2C_TIMEOUT_US 500000 > @@ -1175,10 +1176,14 @@ static int cdns_i2c_master_xfer_atomic(struct i2c_adapter *adap, struct i2c_msg > */ > static u32 cdns_i2c_func(struct i2c_adapter *adap) > { > + struct cdns_i2c *id = adap->algo_data; > u32 func = I2C_FUNC_I2C | I2C_FUNC_10BIT_ADDR | > (I2C_FUNC_SMBUS_EMUL & ~I2C_FUNC_SMBUS_QUICK) | > I2C_FUNC_SMBUS_BLOCK_DATA; > > + if (id->quirks & CDNS_I2C_ENABLE_SMBUS_QUICK) > + func |= I2C_FUNC_SMBUS_QUICK; > + > #if IS_ENABLED(CONFIG_I2C_SLAVE) > func |= I2C_FUNC_SLAVE; > #endif > @@ -1442,9 +1447,24 @@ static const struct cdns_platform_data r1p10_i2c_def = { > .quirks = CDNS_I2C_BROKEN_HOLD_BIT, > }; > > +static const struct cdns_platform_data ax3000_i2c_def = { > + .quirks = CDNS_I2C_ENABLE_SMBUS_QUICK, > +}; > + > +/* > + * The controller does not support zero-length reads. Enabling SMBus Quick > + * commands would otherwise let the core emulate a Quick read as a zero-length > + * read message, which writes 0 to the transfer size register and leaves the > + * hardware in an unsupported state. Reject such transfers in the core. > + */ > +static const struct i2c_adapter_quirks cdns_i2c_quirks = { > + .flags = I2C_AQ_NO_ZERO_LEN_READ, > +}; > + > static const struct of_device_id cdns_i2c_of_match[] = { > { .compatible = "cdns,i2c-r1p10", .data = &r1p10_i2c_def }, > { .compatible = "cdns,i2c-r1p14",}, > + { .compatible = "axiado,ax3000-i2c", .data = &ax3000_i2c_def }, > { /* end of table */ } > }; > MODULE_DEVICE_TABLE(of, cdns_i2c_of_match); > @@ -1510,6 +1530,9 @@ static int cdns_i2c_probe(struct platform_device *pdev) > id->quirks = data->quirks; > } > > + if (id->quirks & CDNS_I2C_ENABLE_SMBUS_QUICK) > + id->adap.quirks = &cdns_i2c_quirks; > + > id->rinfo.pinctrl = devm_pinctrl_get(&pdev->dev); > if (IS_ERR(id->rinfo.pinctrl)) { > int err = PTR_ERR(id->rinfo.pinctrl); > Wiring looks good to me. Acked-by: Michal Simek Thanks, Michal