linux-kernel - Re: [PATCH] mmc: core: Remove timeout when enabling cache

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Date:   Wed, 7 Nov 2018 09:47:41 +0100
From:   Wolfram Sang <wsa@...-dreams.de>
To:     Sjoerd Simons <sjoerd.simons@...labora.co.uk>
Cc:     Faiz Abbas <faiz_abbas@...com>, linux-mmc@...r.kernel.org,
        kernel@...labora.com, linux-kernel@...r.kernel.org,
        Hongjie Fang <hongjiefang@...micro.com>,
        Bastian Stender <bst@...gutronix.de>,
        Kyle Roeschley <kyle.roeschley@...com>,
        Wolfram Sang <wsa+renesas@...g-engineering.com>,
        Shawn Lin <shawn.lin@...k-chips.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Harish Jenny K N <harish_kandiga@...tor.com>,
        Simon Horman <horms+renesas@...ge.net.au>
Subject: Re: [PATCH] mmc: core: Remove timeout when enabling cache


> That also happens to be one of the cards we deploy; However i did
> wonder about adding a quirk but decided against it as it was not clear
> to me from the specification that CACHE ON really is meant to complete
> within GENERIC_CMD6_TIMEOUT. That and i fret about ending up in hit-a-
> mole games as the failure is really quite tedious (boot failure). 

I agree that we should use the more defensive variant as a default. I
mean there should be no performance regression since most cards will
respond just faster, or? The only downside I could see is that we might
miss a real timeout with no bounds set and might get stuck? Maybe it is
worth contacting eMMC spec people to at least know what is the expected
behaviour?


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