Re: [RFC PATCH 2/2] mmc: sdhci: Quirk for AMD SDHC Device 0x7906

From: Adrian Hunter
Date: Mon May 13 2019 - 02:46:19 EST

On 12/05/19 8:04 PM, S-k, Shyam-sundar wrote:
> On 5/2/2019 12:02 PM, Adrian Hunter wrote:
>> Cc: some AMD people
>> On 1/05/19 8:54 PM, Raul E Rangel wrote:
>>> AMD SDHC 0x7906 requires a hard reset to clear all internal state.
>>> Otherwise it can get into a bad state where the DATA lines are always
>>> read as zeros.
>>> This change requires firmware that can transition the device into
>>> D3Cold for it to work correctly. If the firmware does not support
>>> transitioning to D3Cold then the power state transitions are a no-op.
>>> Signed-off-by: Raul E Rangel <rrangel@xxxxxxxxxxxx>
> Signed-off-by: Shyam Sundar S K <Shyam-sundar.S-k@xxxxxxx>

Acked-by: Adrian Hunter <adrian.hunter@xxxxxxxxx>