linux-kernel - Re: [PATCH V1] ufs: core: Fix interrupt handling for MCQ Mode in ufshcd

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Message-ID: <a7cfe930-44b6-41dc-a84b-00f5ba314946@acm.org>
Date: Mon, 28 Jul 2025 16:41:01 -0700
From: Bart Van Assche <bvanassche@....org>
To: Nitin Rawat <quic_nitirawa@...cinc.com>, alim.akhtar@...sung.com,
 avri.altman@....com, James.Bottomley@...senPartnership.com,
 huobean@...il.com, mani@...nel.org, martin.petersen@...cle.com,
 beanhuo@...ron.com, peter.wang@...iatek.com, andre.draszik@...aro.org
Cc: linux-arm-msm@...r.kernel.org, linux-scsi@...r.kernel.org,
 linux-kernel@...r.kernel.org, Palash Kambar <quic_pkambar@...cinc.com>
Subject: Re: [PATCH V1] ufs: core: Fix interrupt handling for MCQ Mode in
 ufshcd_intr

On 7/28/25 3:57 PM, Nitin Rawat wrote:
> diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
> index fd8015ed36a4..5413464d63c8 100644
> --- a/drivers/ufs/core/ufshcd.c
> +++ b/drivers/ufs/core/ufshcd.c
> @@ -7145,14 +7145,19 @@ static irqreturn_t ufshcd_threaded_intr(int irq, void *__hba)
>   static irqreturn_t ufshcd_intr(int irq, void *__hba)
>   {
>   	struct ufs_hba *hba = __hba;
> +	u32 intr_status, enabled_intr_status;
> 
>   	/* Move interrupt handling to thread when MCQ & ESI are not enabled */
>   	if (!hba->mcq_enabled || !hba->mcq_esi_enabled)
>   		return IRQ_WAKE_THREAD;
> 
> +	intr_status = ufshcd_readl(hba, REG_INTERRUPT_STATUS);
> +	enabled_intr_status = intr_status & ufshcd_readl(hba, REG_INTERRUPT_ENABLE);
> +
> +	ufshcd_writel(hba, intr_status, REG_INTERRUPT_STATUS);
> +
>   	/* Directly handle interrupts since MCQ ESI handlers does the hard job */
> -	return ufshcd_sl_intr(hba, ufshcd_readl(hba, REG_INTERRUPT_STATUS) &
> -				   ufshcd_readl(hba, REG_INTERRUPT_ENABLE));
> +	return ufshcd_sl_intr(hba, enabled_intr_status);
>   }

Hi Nitin,

Thank you for having published this patch. It seems like we both have 
been working on a fix independently and without knowing about each 
other's efforts. Can you please take a look at this patch and let me
know which version you prefer?

https://lore.kernel.org/linux-scsi/20250728212731.899429-1-bvanassche@acm.org/

Thanks,

Bart.