netdev - Re: [PATCH] rtlwifi: add MSI interrupts support

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Date:	Tue, 25 Mar 2014 17:13:21 +0800
From:	Adam Lee <adam.lee@...onical.com>
To:	Larry Finger <Larry.Finger@...inger.net>
Cc:	linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
	"John W. Linville" <linville@...driver.com>,
	Chaoming Li <chaoming_li@...lsil.com.cn>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH] rtlwifi: add MSI interrupts support

On Mon, Mar 24, 2014 at 10:14:06AM -0500, Larry Finger wrote:
> On 03/24/2014 06:34 AM, Adam Lee wrote:
> >Add MSI interrupts support, enable it when msi_support flag is true,
> >also could fallback to pin-based interrupts mode if MSI mode fails.
> >
> >Signed-off-by: Adam Lee <adam.lee@...onical.com>
> 
> Your first patch turns on MSI support unconditionally. That implies that
> there are no harmful effects for attempting to use MSI on a box where it is
> not needed, and/or not implemented. If that is the case, then the
> msi_support bool should be eliminated, your first patch dropped, and this
> one revised appropriately. Driver rtl8723be added this bool, but never uses
> it. Once that driver reaches mainline, a patch can be prepared to remove the
> variable.

Hi, Larry

Just confirmed with RealTek wireless engineer, their policy is:

> Case 1: if the platform supports both MSI and Pin-based, our driver will use MSI.
> Case 2: if the platform supports MSI only, our driver will use MSI.
> Case 3: if the platform supports Pin-Based only, out driver will use Pin-Based.

I think it's safe enough to apply the first "rtlwifi: rtl8188ee: enable
MSI interrupts support" patch also, and the msi_support bool should not
be eliminated(at least for now) in case some wifi modules don't support
MSI well.

Thanks.

-- 
Adam Lee
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