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From:   Kalle Valo <kvalo@codeaurora.org>
To:     Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Cc:     hemantk@codeaurora.org, linux-arm-msm@vger.kernel.org,
        Carl Huang <cjhuang@codeaurora.org>,
        ath11k@lists.infradead.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v3] mhi: use irq_flags if controller driver configures it
References: <20210104101128.8217-1-cjhuang@codeaurora.org>
        <20210104170359.GE2256@work> <87o8hti8t8.fsf@codeaurora.org>
        <20210121075242.GB30041@thinkpad>
Date:   Tue, 26 Jan 2021 12:14:04 +0200
In-Reply-To: <20210121075242.GB30041@thinkpad> (Manivannan Sadhasivam's
        message of "Thu, 21 Jan 2021 13:22:42 +0530")
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Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> writes:

> On Wed, Jan 13, 2021 at 09:40:19AM +0200, Kalle Valo wrote:
>> Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> writes:
>> 
>> > On Mon, Jan 04, 2021 at 06:11:28PM +0800, Carl Huang wrote:
>> >> If controller driver has specified the irq_flags, mhi uses this specified
>> >> irq_flags. Otherwise, mhi uses default irq_flags.
>> >> 
>> >> The purpose of this change is to support one MSI vector for QCA6390.
>> >> MHI will use one same MSI vector too in this scenario.
>> >> 
>> >> In case of one MSI vector, IRQ_NO_BALANCING is needed when irq handler
>> >> is requested. The reason is if irq migration happens, the msi_data may
>> >> change too. However, the msi_data is already programmed to QCA6390
>> >> hardware during initialization phase. This msi_data inconsistence will
>> >> result in crash in kernel.
>> >> 
>> >> Another issue is in case of one MSI vector, IRQF_NO_SUSPEND will trigger
>> >> WARNINGS because QCA6390 wants to disable the IRQ during the suspend.
>> >> 
>> >> To avoid above two issues, QCA6390 driver specifies the irq_flags in case
>> >> of one MSI vector when mhi_register_controller is called.
>> >> 
>> >> Signed-off-by: Carl Huang <cjhuang@codeaurora.org>
>> >> Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
>> >
>> > Applied to mhi-next!
>> 
>> Would it be possible again to have an immutable branch for this commit?
>> We need it for implementing one MHI support to ath11k[1] required by
>> Dell XPS 13 9310 laptops, which a lot of people are waiting. Otherwise I
>> can only apply the feature for v5.13, which will be released on July.
>> 
>
> Dropped this patch from mhi-next and applied to mhi-ath11k-immutable branch:
> https://git.kernel.org/pub/scm/linux/kernel/git/mani/mhi.git/log/?h=mhi-ath11k-immutable
>
> This branch will also be merged into mhi-next.

Thanks a lot!

And Greg will also pull this directly so that commit ids won't change?
Just trying to avoid conflicts between ath and mhi trees as much as
possible.

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