linux-kernel - Re: [PATCH v2 6/8] i2c: qcom-geni: Load i2c qup Firmware from linux side

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Message-ID: <d3447c17-e035-4021-a199-9ff2f4715e1e@quicinc.com>
Date: Mon, 27 Jan 2025 11:10:24 +0530
From: Viken Dadhaniya <quic_vdadhani@...cinc.com>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
CC: <andi.shyti@...nel.org>, <robh@...nel.org>, <krzk+dt@...nel.org>,
        <conor+dt@...nel.org>, <gregkh@...uxfoundation.org>,
        <jirislaby@...nel.org>, <broonie@...nel.or>, <andersson@...nel.org>,
        <konradybcio@...nel.org>, <johan+linaro@...nel.org>,
        <dianders@...omium.org>, <agross@...nel.org>,
        <linux-arm-msm@...r.kernel.org>, <linux-i2c@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-serial@...r.kernel.org>, <linux-spi@...r.kernel.org>,
        <quic_msavaliy@...cinc.com>, <quic_anupkulk@...cinc.com>
Subject: Re: [PATCH v2 6/8] i2c: qcom-geni: Load i2c qup Firmware from linux
 side



On 1/24/2025 9:25 PM, Dmitry Baryshkov wrote:
> On Fri, 24 Jan 2025 at 17:24, Viken Dadhaniya <quic_vdadhani@...cinc.com> wrote:
>>
>>
>>
>> On 1/24/2025 8:34 PM, Dmitry Baryshkov wrote:
>>> On Fri, Jan 24, 2025 at 04:23:07PM +0530, Viken Dadhaniya wrote:
>>>> Add provision to load firmware of Serial engine for I2C protocol from
>>>> Linux Execution Environment on running on APPS processor.
>>>>
>>>> Co-developed-by: Mukesh Kumar Savaliya <quic_msavaliy@...cinc.com>
>>>> Signed-off-by: Mukesh Kumar Savaliya <quic_msavaliy@...cinc.com>
>>>> Signed-off-by: Viken Dadhaniya <quic_vdadhani@...cinc.com>
>>>> ---
>>>>    drivers/i2c/busses/i2c-qcom-geni.c | 7 +++++--
>>>>    1 file changed, 5 insertions(+), 2 deletions(-)
>>>>
>>>> diff --git a/drivers/i2c/busses/i2c-qcom-geni.c b/drivers/i2c/busses/i2c-qcom-geni.c
>>>> index 7bbd478171e0..9ad3b8c9a224 100644
>>>> --- a/drivers/i2c/busses/i2c-qcom-geni.c
>>>> +++ b/drivers/i2c/busses/i2c-qcom-geni.c
>>>> @@ -872,8 +872,11 @@ static int geni_i2c_probe(struct platform_device *pdev)
>>>>       }
>>>>       proto = geni_se_read_proto(&gi2c->se);
>>>>       if (proto != GENI_SE_I2C) {
>>>> -            ret = dev_err_probe(dev, -ENXIO, "Invalid proto %d\n", proto);
>>>> -            goto err_resources;
>>>> +            ret = geni_load_se_firmware(&gi2c->se, GENI_SE_I2C);
>>>
>>> Hmm, so if the SE has been configured to e.g. SPI by the TZ, can we
>>> switch it to the I2C?
>>
>> No, in the current design, TZ will not load the SE firmware.
> 
> But that's what your patch is doing: if the protocol is not I2C, try
> switching to I2C.
> 
> Instead it should be 'if unconfigured, try loading I2C'.

Sure, I will update it in the next patch.

> 
>>
>>>
>>>> +            if (ret) {
>>>> +                    dev_err(gi2c->se.dev, "i2c firmware load failed ret: %d\n", ret);
>>>> +                    goto err_resources;
>>>> +            }
>>>>       }
>>>>
>>>>       if (desc && desc->no_dma_support)
>>>> --
>>>> 2.34.1
>>>>
>>>
> 
> 
>