From: Tom Rini <trini@konsulko.com>
To: u-boot@lists.denx.de
Subject: [U-Boot] [PATCH 3/4] ARM: dts: am57xx: Disable voltage switching for SD card
Date: Sun, 28 Jul 2019 17:49:31 -0400 [thread overview]
Message-ID: <20190728214931.GM20116@bill-the-cat> (raw)
In-Reply-To: <20190620093722.15471-4-faiz_abbas@ti.com>
On Thu, Jun 20, 2019 at 03:07:21PM +0530, Faiz Abbas wrote:
> If UHS speed modes are enabled, a compatible SD card switches down to 1.8V
> during enumeration. If after this a software reboot/crash takes place and
> on-chip ROM tries to enumerate the SD card, the difference in
> IO voltages (host @ 3.3V and card @ 1.8V) may end up damaging the card.
>
> The fix for this is to have support for power cycling the card in
> hardware (with a PORz/soft-reset line causing a power cycle of the card).
> Because the beaglebone X15 (rev A,B and C), am57xx-evms and am57xx-idks don't
> have this capability, disable voltage switching for these boards.
>
> The major effect of this is that the maximum supported speed mode is now
> high speed(50 MHz) down from SDR104(200 MHz).
>
> Signed-off-by: Faiz Abbas <faiz_abbas@ti.com>
Applied to u-boot/master, thanks!
--
Tom
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next prev parent reply other threads:[~2019-07-28 21:49 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-20 9:37 [U-Boot] [PATCH 0/4] MMC Fixes for dra7xx and am57xx boards Faiz Abbas
2019-06-20 9:37 ` [U-Boot] [PATCH 1/4] ARM: dts: dra7-mmc-iodelay: Add a new pinctrl group for clk line without pullup Faiz Abbas
2019-07-28 21:49 ` Tom Rini
2019-06-20 9:37 ` [U-Boot] [PATCH 2/4] ARM: dts: am574x-idk: Add pinmuxes for mmc1 and mmc2 Faiz Abbas
2019-07-28 21:49 ` Tom Rini
2019-06-20 9:37 ` [U-Boot] [PATCH 3/4] ARM: dts: am57xx: Disable voltage switching for SD card Faiz Abbas
2019-07-28 21:49 ` Tom Rini [this message]
2019-06-20 9:37 ` [U-Boot] [PATCH 4/4] ARM: dts: dra76x: Update MMC2_HS200_MANUAL1 iodelay values Faiz Abbas
2019-07-28 21:49 ` Tom Rini
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