ata: Rework how flushing, sleeping, and power off interacts

 * FLUSH_EXT is used if featureflag is set and we are using LBA48
   (unconditionally used for CE-ATA on ipod6g)
 * FLUSH is used if featureflag is set (ATA6+) or if device claims to be ATA5+

 * Rename ata_disk_can_power_off() to ata_disk_can_sleep() as that is
   what it actually tests for.  Only use it to gate issuing the
   STANDBY IMMEDIATE command.
 * Restore behavior of ata_disk_is_active() to return 1 if drive is
   "spinning" or powered up.
 * Allow poweroff if drive claims PM support OR we are able to issue
   FLUSH/FLUSH_EXT commands.

 * Added ata_flush() to explicitly trigger a flush operation, and hook it
   up to storage_flush() in the device shutdown path. (Flushes were
   only previously used in the storage device power management path)

 * After issuing all settings, re-issue IDENTIFY_DEVICE to make sure
   it reflects everything we've enabled.

 * Update manual section on Flash/SSD mods.

Change-Id: I6770a54ef3a87f4c47120bcb96c944a6652f1bf4

1 files changed, 2 insertions, 0 deletions

diff --git a/apps/debug_menu.c b/apps/debug_menu.c
index 57c51e7b54..6f30d00d49 100644
--- a/apps/debug_menu.c
+++ b/apps/debug_menu.c
@@ -1481,6 +1481,8 @@ static int disk_callback(int btn, struct gui_synclist *lists)
     i = identify_info[83] & (1<<9);
     simplelist_addline(
              "Noise mgmt: %s", i ? "enabled" : "unsupported");
+    simplelist_addline(
+             "Flush cache: %s", identify_info[83] & (1<<13) ? "extended" : identify_info[83] & (1<<12) ? "standard" : identify_info[80] >= (1<<5) ? "ATA-5" : "unsupported");
     i = identify_info[82] & (1<<6);
     simplelist_addline(
              "Read-ahead: %s", i ? "enabled" : "unsupported");