linux-kernel - Re: [PATCH] mmc: sdhci-acpi: set non-removable in ACPI table

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Message-ID: <5669E72C.4090701@codeaurora.org>
Date:	Thu, 10 Dec 2015 15:57:16 -0500
From:	Philip Elcan <pelcan@...eaurora.org>
To:	Adrian Hunter <adrian.hunter@...el.com>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org
CC:	linux-arm-msm@...r.kernel.org, Timur Tabi <timur@...eaurora.org>,
	Jon Masters <jcm@...hat.org>,
	Mark Langsdorf <mlangsdo@...hat.com>, harba@...eaurora.org
Subject: Re: [PATCH] mmc: sdhci-acpi: set non-removable in ACPI table


On 12/07/2015 03:30 AM, Adrian Hunter wrote:
> On 04/12/15 17:40, Philip Elcan wrote:
>> On 12/03/2015 09:14 AM, Adrian Hunter wrote:
>>> On 03/12/15 15:48, Philip Elcan wrote:
>>>> This allows setting an SDHC controller as non-removable
>>>> by using the _RMV method in the ACPI table. It doesn't
>>> Is that _RMV on the host controller?  Shouldn't it be on the card i.e. child
>>> device node?
>> Yes, this is on the host controller. The ACPI table only describes the
>> host controller, not the child nodes.
>>
> If you look at Intel devices, the _RMV is on the child e.g.
>
>         Device (SDHA)
>         {
>             Name (_HID, "80860F14")  // _HID: Hardware ID
>             Name (_CID, "PNP0D40")  // _CID: Compatible ID
>             Name (_DDN, "Intel(R) eMMC Controller - 80860F14")  // _DDN: DOS Device Name
> 	    ...
>             Device (EMMD)
>             {
> 		...
>                 Method (_RMV, 0, NotSerialized)  // _RMV: Removal Status
>                 {
>                     Return (Zero)
>                 }
>             }
>         }
>
> I am not an ACPI expert but that seems like the correct place for it.
My understanding is that in ACPI you don't generally create child devices on buses that are discoverable.
>
>>>> mark it as non-removable if GPIO card detection is
>>>> already setup.
>>>>
>>>> Signed-off-by: Philip Elcan <pelcan@...eaurora.org>
>>>> ---
>>>>

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The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
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