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

[Philip Elcan]

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@xxxxxxxxxxxxxx>
>>>> ---
>>>>

-- 
Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/