linux-kernel - Re: [PATCH] mmc: sdhci-pci-gli: increase 1.8V regulator wait

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Date:   Mon, 26 Apr 2021 20:25:26 +1200
From:   Daniel Beer <dlbeer@...il.com>
To:     Ben Chuang <benchuanggli@...il.com>
Cc:     adrian.hunter@...el.com, ben.chuang@...esyslogic.com.tw,
        linux-kernel@...r.kernel.org, linux-mmc@...r.kernel.org,
        ulf.hansson@...aro.org
Subject: Re: [PATCH] mmc: sdhci-pci-gli: increase 1.8V regulator wait

On Mon, Apr 26, 2021 at 03:32:51PM +0800, Ben Chuang wrote:
> > The driver currently waits 5ms after switching on the 1.8V regulator for
> > it to become stable. Increasing this to 10ms gets rid of the warning
> > about stability, but most cards still fail. Increasing it to 20ms gets
> > some cards working (a 32GB Samsung micro SD works, a 128GB ADATA
> > doesn't). At 50ms, the ADATA works most of the time, and at 100ms both
> > cards work reliably.
> 
> If it is convenient, can you provide the appearance pictures and product
> links of these two cards? We want to buy them.

Hi Ben,

The first is a Samsung EVO microSDXC 32GB:

    https://www.samsung.com/nz/memory-storage/memory-card/evo-plus-microsd-card-95-mbs-sd-adapter-32gb-mb-mc32ga-apc/

The second is an ADATA Premier Pro SDXC UHS-I U3 Class 10 (V30S) 128GB:

    https://www.adata.com/us/consumer/289

The images on those two pages match what I have in front of me here.

Cheers,
Daniel

-- 
Daniel Beer <dlbeer@...il.com> http://dlbeer.co.nz/
PGP: BA6E 0B26 1F89 246C E3F3  C910 1E58 C43A 160A 553B