linux

iv/linux

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Claudiu Beznea 7a94b83a7d ARM: at91: pm: fix DDR recalibration when resuming from backup and self-refresh

On SAMA7G5, when resuming from backup and self-refresh, the bootloader
performs DDR PHY recalibration by restoring the value of ZQ0SR0 (stored
in RAM by Linux before going to backup and self-refresh). It has been
discovered that the current procedure doesn't work for all possible values
that might go to ZQ0SR0 due to hardware bug. The workaround to this is to
avoid storing some values in ZQ0SR0. Thus Linux will read the ZQ0SR0
register and cache its value in RAM after processing it (using
modified_gray_code array). The bootloader will restore the processed value.

Fixes: d2d4716d8384 ("ARM: at91: pm: save ddr phy calibration data to securam")
Suggested-by: Frederic Schumacher <frederic.schumacher@microchip.com>
Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Link: https://lore.kernel.org/r/20220826083927.3107272-4-claudiu.beznea@microchip.com

2022-08-31 10:28:18 +03:00

.gitignore

.gitignore: add SPDX License Identifier

2020-03-25 11:50:48 +01:00

at91rm9200.c

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 4

2019-05-21 11:28:40 +02:00

at91sam9.c

ARM: at91: pm: move SAM9X60's PM under its own SoC config flag

2019-12-10 00:44:53 +01:00

generic.h

ARM: at91: pm: add pm support for SAMA7G5