linux-kernel - Re: [PATCH v3 3/5] brcmfmac: sdio: Disable auto-tuning around commands expected to fail

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Date:   Wed, 12 Jun 2019 13:11:46 +0200
From:   Arend Van Spriel <arend.vanspriel@...adcom.com>
To:     Ulf Hansson <ulf.hansson@...aro.org>,
        Doug Anderson <dianders@...omium.org>
Cc:     "Hunter, Adrian" <adrian.hunter@...el.com>,
        Kalle Valo <kvalo@...eaurora.org>,
        "brcm80211-dev-list.pdl@...adcom.com" 
        <brcm80211-dev-list.pdl@...adcom.com>,
        "linux-rockchip@...ts.infradead.org" 
        <linux-rockchip@...ts.infradead.org>,
        Double Lo <double.lo@...ress.com>,
        "briannorris@...omium.org" <briannorris@...omium.org>,
        "linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
        Naveen Gupta <naveen.gupta@...ress.com>,
        Madhan Mohan R <madhanmohan.r@...ress.com>,
        "mka@...omium.org" <mka@...omium.org>,
        Wright Feng <wright.feng@...ress.com>,
        Chi-Hsien Lin <chi-hsien.lin@...ress.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "brcm80211-dev-list@...ress.com" <brcm80211-dev-list@...ress.com>,
        Franky Lin <franky.lin@...adcom.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Hante Meuleman <hante.meuleman@...adcom.com>,
        YueHaibing <yuehaibing@...wei.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH v3 3/5] brcmfmac: sdio: Disable auto-tuning around
 commands expected to fail

On 6/12/2019 12:10 PM, Ulf Hansson wrote:
>> drivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c:
>>    mmc_set_data_timeout(md, func->card);
>>    mmc_wait_for_req(func->card->host, mr);
> These are not okay, none of these things calls should really be done
> from an SDIO func driver.
> 
> It tells me that the func driver is a doing workaround for something
> that should be managed in a common way.

We are using some low-level functions passing chain of skbuff to the 
device using CMD53 with scatterlist. If I recall correctly Marvell made 
an attempt to have a similar function for it in the mmc stack. Not sure 
if that ever made it in. If so I can rework our driver using that API. 
If not, I can make a new attempt.

Regards,
Arend