linux-kernel - Re: [PATCH 1/2] soc: qcom: smp2p: Add irqchip state support

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Message-ID: <f2a46da9-23f1-425e-8978-0fa412ed1dfa@quicinc.com>
Date: Wed, 22 Oct 2025 16:27:28 +0530
From: Deepak Kumar Singh <quic_deesin@...cinc.com>
To: Konrad Dybcio <konrad.dybcio@....qualcomm.com>,
        Jingyi Wang
	<jingyi.wang@....qualcomm.com>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>
CC: <linux-arm-msm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Chris Lew
	<chris.lew@....qualcomm.com>
Subject: Re: [PATCH 1/2] soc: qcom: smp2p: Add irqchip state support



On 10/21/2025 3:05 PM, Konrad Dybcio wrote:
> On 10/21/25 10:12 AM, Deepak Kumar Singh wrote:
>>
>>
>> On 9/24/2025 8:20 PM, Konrad Dybcio wrote:
>>> On 9/24/25 6:18 AM, Jingyi Wang wrote:
>>>> From: Chris Lew <chris.lew@....qualcomm.com>
>>>>
>>>> A remoteproc booted during earlier boot stages such as UEFI or the
>>>> bootloader, may need to be attached to without restarting the remoteproc
>>>> hardware. To do this the remoteproc will need to check the ready and
>>>> handover states in smp2p without an interrupt notification.
>>>>
>>>> Add support for the .irq_get_irqchip_state callback so remoteproc can
>>>> read the current state of the fatal, ready and handover bits.
>>>>
>>>> Signed-off-by: Chris Lew <chris.lew@....qualcomm.com>
>>>> Co-developed-by: Jingyi Wang <jingyi.wang@....qualcomm.com>
>>>> Signed-off-by: Jingyi Wang <jingyi.wang@....qualcomm.com>
>>>> ---
>>>>    drivers/soc/qcom/smp2p.c | 55 ++++++++++++++++++++++++++++++++++++++++++++++++
>>>>    1 file changed, 55 insertions(+)
>>>>
>>>> diff --git a/drivers/soc/qcom/smp2p.c b/drivers/soc/qcom/smp2p.c
>>>> index cb515c2340c1..e2cfd9ec8875 100644
>>>> --- a/drivers/soc/qcom/smp2p.c
>>>> +++ b/drivers/soc/qcom/smp2p.c
>>>> @@ -222,6 +222,39 @@ static void qcom_smp2p_negotiate(struct qcom_smp2p *smp2p)
>>>>        }
>>>>    }
>>>>    +static void qcom_smp2p_start_in(struct qcom_smp2p *smp2p)
>>>> +{
>>>> +    unsigned int smem_id = smp2p->smem_items[SMP2P_INBOUND];
>>>> +    unsigned int pid = smp2p->remote_pid;
>>>> +    char buf[SMP2P_MAX_ENTRY_NAME];
>>>> +    struct smp2p_smem_item *in;
>>>> +    struct smp2p_entry *entry;
>>>> +    size_t size;
>>>> +    int i;
>>>> +
>>>> +    in = qcom_smem_get(pid, smem_id, &size);
>>>> +    if (IS_ERR(in))
>>>> +        return;
>>>> +
>>>> +    smp2p->in = in;
>>>> +
>>>> +    /* Check if version is initialized and set to v2 */
>>>> +    if (in->version == 0)
>>>> +        return;
>>>
>>> This doesn't seem to be fully in line with the comment
>>>
>>> Konrad
>>>
>> Hi Konard,
>>
>> Can you please elaborate more on this?
>> in->version == 0 means remote has not initialized the version yet, so no need of enumerating entries. For other case i.e in->version == 1 or 2, in entries added by early booted remote has to be enumerated.
> 
> It's not at all obvious that 0 is supposed to mean "uninitialized"
> 
> Please #define it
> 
> Konrad
I think that can be added or instead we can replace (in->version == 0 
)with (in->version != SMP2P_VERSION_2).