From mboxrd@z Thu Jan  1 00:00:00 1970
From: NeilBrown <neil@brown.name>
Subject: Re: [PATCH 4/5] mmc: mtk-sd: enable internal card-detect logic.
Date: Sat, 04 May 2019 18:18:31 +1000
Message-ID: <87o94i3a5k.fsf@notabene.neil.brown.name>
References: <155538933003.25108.3338569916935462285.stgit@noble.brown> <155539004931.25108.17076624786044710325.stgit@noble.brown> <1555569583.18628.29.camel@mhfsdcap03>
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To: Chaotian Jing <chaotian.jing@mediatek.com>
Cc: Ulf Hansson <ulf.hansson@linaro.org>, linux-mmc@vger.kernel.org, linux-kernel@vger.kernel.org, thirtythreeforty@gmail.com
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On Thu, Apr 18 2019, Chaotian Jing wrote:

> On Tue, 2019-04-16 at 14:47 +1000, NeilBrown wrote:
>> The mtk-sd silicon has integrated card-detect logic that is
>> enabled, at least, on the MT7621 as used in the GNUBEE NAS.
>>=20
>> If the sdhci isn't marked non-removable and doesn't have a
>> cd-gpio configured, assume the internal cd logic should be used.
>>=20
>> Signed-off-by: NeilBrown <neil@brown.name>
...

>> @@ -2206,6 +2247,15 @@ static int msdc_drv_probe(struct platform_device =
*pdev)
>>  		goto host_free;
>>  	}
>>=20=20
>> +	if (!(mmc->caps & MMC_CAP_NONREMOVABLE) &&
>> +	    !mmc_can_gpio_cd(mmc)) {
>
> Should not do this assume!
> better to add "mediatek,internal-cd" in your DTS, then no impact to
> other Soc.

(Sorry for the delay).

Documentation/devicetree/bindings/mmc/mmc.txt

says:
   If no property below is supplied, host native card detect is used.

So this assumption is *exactly* what the documentation said we should
do.

How about I limit this assumption to mt7621 using a flag in the
mtk_mmc_compatible structure?

Thanks,
NeilBrown

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