linux-kernel - Re: [RFC PATCH 08/17] net: ipa: Add support for IPA v2.x interrupts

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Message-ID: <356e77b6-7a90-a75b-7ee8-33d8c92ead33@ieee.org>
Date:   Wed, 13 Oct 2021 17:29:58 -0500
From:   Alex Elder <elder@...e.org>
To:     Sireesh Kodali <sireeshkodali1@...il.com>,
        phone-devel@...r.kernel.org, ~postmarketos/upstreaming@...ts.sr.ht,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, elder@...nel.org
Cc:     Vladimir Lypak <vladimir.lypak@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Subject: Re: [RFC PATCH 08/17] net: ipa: Add support for IPA v2.x interrupts

On 9/19/21 10:08 PM, Sireesh Kodali wrote:
> From: Vladimir Lypak <vladimir.lypak@...il.com>
> 
> Interrupts on IPA v2.x have different numbers from the v3.x and above
> interrupts. IPA v2.x also doesn't support the TX_SUSPEND irq, like v3.0

I'm not sure I like this way of fixing the interrupt ids (by
adding an offset), but it's a simple change.  (And now I have
a better understanding for why the "fixup" function exists).

					-Alex

> 
> Signed-off-by: Vladimir Lypak <vladimir.lypak@...il.com>
> Signed-off-by: Sireesh Kodali <sireeshkodali1@...il.com>
> ---
>   drivers/net/ipa/ipa_interrupt.c | 11 ++++++++---
>   1 file changed, 8 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/net/ipa/ipa_interrupt.c b/drivers/net/ipa/ipa_interrupt.c
> index 94708a23a597..37b5932253aa 100644
> --- a/drivers/net/ipa/ipa_interrupt.c
> +++ b/drivers/net/ipa/ipa_interrupt.c
> @@ -63,6 +63,11 @@ static bool ipa_interrupt_check_fixup(enum ipa_irq_id *irq_id, enum ipa_version
>   
>   	if (*irq_id >= IPA_IRQ_DRBIP_PKT_EXCEED_MAX_SIZE_EN)
>   		return version >= IPA_VERSION_4_9;
> +	else if (*irq_id > IPA_IRQ_BAM_GSI_IDLE)
> +		return version >= IPA_VERSION_3_0;
> +	else if (version <= IPA_VERSION_2_6L &&
> +			*irq_id >= IPA_IRQ_PROC_UC_ACK_Q_NOT_EMPTY)
> +		*irq_id += 2;
>   
>   	return true;
>   }
> @@ -152,8 +157,8 @@ static void ipa_interrupt_suspend_control(struct ipa_interrupt *interrupt,
>   
>   	WARN_ON(!(mask & ipa->available));
>   
> -	/* IPA version 3.0 does not support TX_SUSPEND interrupt control */
> -	if (ipa->version == IPA_VERSION_3_0)
> +	/* IPA version <=3.0 does not support TX_SUSPEND interrupt control */
> +	if (ipa->version <= IPA_VERSION_3_0)
>   		return;
>   
>   	offset = ipa_reg_irq_suspend_en_offset(ipa->version);
> @@ -190,7 +195,7 @@ void ipa_interrupt_suspend_clear_all(struct ipa_interrupt *interrupt)
>   	val = ioread32(ipa->reg_virt + offset);
>   
>   	/* SUSPEND interrupt status isn't cleared on IPA version 3.0 */
> -	if (ipa->version == IPA_VERSION_3_0)
> +	if (ipa->version <= IPA_VERSION_3_0)
>   		return;
>   
>   	offset = ipa_reg_irq_suspend_clr_offset(ipa->version);
>