[PATCH v2 0/2] ARM: at91: properly handle LPDDR poweroff

Alexandre Belloni
2016-10-19T11:44:18Z

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 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/at91-poweroff.c | 54 +++++++++++++++++++++++++++++++-
drivers/power/reset/at91-sama5d2_shdwc.c | 49 ++++++++++++++++++++++++++++-
include/soc/at91/at91sam9_ddrsdr.h | 3 ++
3 files changed, 104 insertions(+), 2 deletions(-)

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2.9.3