From: Heiko Stuebner <heiko-4mtYJXux2i+zQB+pC5nmwQ@public.gmane.org>
To: Wadim Egorov <w.egorov-guT5V/WYfQezQB+pC5nmwQ@public.gmane.org>
Cc: linux-rockchip-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org,
naobsd-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org
Subject: Re: [PATCH] ARM: dts: rockchip: Bump sd card pin drive strength up on firefly boards
Date: Fri, 22 Jan 2016 14:33:13 +0100 [thread overview]
Message-ID: <1922254.O59ZZAW3Pv@phil> (raw)
In-Reply-To: <1453381033-3479-1-git-send-email-w.egorov-guT5V/WYfQezQB+pC5nmwQ@public.gmane.org>
Am Donnerstag, 21. Januar 2016, 13:57:13 schrieb Wadim Egorov:
> It seems some firefly boards need 12mA drive strength for sdmmc.
> Using 4mA/8mA drive strength will cause the kernel to fail to recognize
> the sd card correctly.
> Increased the sdmmc lines drive strength from 4mA to 12mA.
>
> Signed-off-by: Wadim Egorov <w.egorov-guT5V/WYfQezQB+pC5nmwQ@public.gmane.org>
applied to my dts32 branch for 4.6.
As I said somewhere on IRC before, it might be worthwhile to bump the
default drive-strength at some point, but so far it seems the minimal needed
values seem to diverge (8mA on Veyron, 12ma [4mA on mine] on firefly and
seemingly 4mA working fine on the Rock2). So I guess we'll postpone that a
bit more until we have more datapoints ;-)
Heiko
prev parent reply other threads:[~2016-01-22 13:33 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-21 12:57 [PATCH] ARM: dts: rockchip: Bump sd card pin drive strength up on firefly boards Wadim Egorov
[not found] ` <1453381033-3479-1-git-send-email-w.egorov-guT5V/WYfQezQB+pC5nmwQ@public.gmane.org>
2016-01-22 13:33 ` Heiko Stuebner [this message]
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