GitHub-Mirror/Star64_linux
2
0
Fork 0
mirror of https://github.com/Fishwaldo/Star64_linux.git synced 2025-07-21 22:32:45 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

memory: emif: Handle devices which are not rated for >85C

Browse source 
As per JESD209-2E specification for LPDDR2,
      http://www.jedec.org/standards-documents/results/jesd209-2E
Table 73, LPDDR2 memories come in two flavors - Standard and
Extended. The Standard types can operate from -25C to +85C
However, beyond that and upto +105C can only be supported by
Extended types.

Unfortunately, it seems there is no info in MR0(device info) or
MR[1,2](device feature) for run time detection of this capability
as far as seen on the spec. Hence, we provide a custom_config
flag to be populated by platforms which have these "extended"
type memories.

For the "Standard" memories, we need to consider MR4 notifications
of temperature triggers >85C as equivalent to thermal shutdown
events (equivalent to Spec specified thermal shutdown events for
"extended" parts).

Reported-by: Richard Woodruff <r-woodruff2@ti.com>
Signed-off-by: Nishanth Menon <nm@ti.com>
Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Nishanth Menon 2013-03-16 11:46:44 +05:30 • committed by Greg Kroah-Hartman
parent 25aaacd283
commit f91a595d0b
2 changed files with 28 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

1
include/linux/platform_data/emif_plat.h
View file

@ -40,6 +40,7 @@
/* Custom config requests */
#define EMIF_CUSTOM_CONFIG_LPMODE 0x00000001
#define EMIF_CUSTOM_CONFIG_TEMP_ALERT_POLL_INTERVAL 0x00000002
#define EMIF_CUSTOM_CONFIG_EXTENDED_TEMP_PART 0x00000004
#ifndef __ASSEMBLY__
/**