linux-kernel - [PATCH v3 0/2] ARM: at91: properly handle LPDDR poweroff

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <20161025093759.20913-1-alexandre.belloni@free-electrons.com>
Date:   Tue, 25 Oct 2016 11:37:57 +0200
From:   Alexandre Belloni <alexandre.belloni@...e-electrons.com>
To:     Sebastian Reichel <sre@...nel.org>,
        Dmitry Eremin-Solenikov <dbaryshkov@...il.com>
Cc:     Nicolas Ferre <nicolas.ferre@...el.com>,
        Jean-Jacques Hiblot <jjhiblot@...phandler.com>,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Alexandre Belloni <alexandre.belloni@...e-electrons.com>
Subject: [PATCH v3 0/2] ARM: at91: properly handle LPDDR poweroff

Hi,

This patch set improves LPDDR support on SoCs using the Atmel MPDDR controller.

LPDDR memories can only handle up to 400 uncontrolled power offs in their
life. The proper power off sequence has to be applied before shutting down the
SoC.

I'm not too happy with the code duplication but this is a design choice
that has been made before because both shutdown controllers are really
different apart from the shutdown itself.

I guess it is still better than slowly killing the LPDDR.

Changes in v3:
 - removed COMPILE_TEST for sama5d2_shdwc as it is now ARM specific

Changes in v2:
 - Fix typos
 - Add a comment for the dummy read access of AT91_SHDW_CR
 - Properly set up pm_power_off in at91_poweroff_probe()


Alexandre Belloni (2):
  ARM: at91: define LPDDR types
  power/reset: at91-poweroff: timely shutdown LPDDR memories

 drivers/power/reset/Kconfig              |  2 +-
 drivers/power/reset/at91-poweroff.c      | 54 +++++++++++++++++++++++++++++++-
 drivers/power/reset/at91-sama5d2_shdwc.c | 49 ++++++++++++++++++++++++++++-
 include/soc/at91/at91sam9_ddrsdr.h       |  3 ++
 4 files changed, 105 insertions(+), 3 deletions(-)

-- 
2.9.3