On 11/17/2012 03:44 PM, Shane Huang wrote:
NCQ capability was used to check availability of SATA Settings page from Identify Device Data Log, which contains DevSlp timing variables. It does not work on some HDDs and leads to error messages. IDENTIFY word 78 bit 5(Hardware Feature Control) should be used. Quoting SATA spec 3.1: If Hardware Feature Control is supported, then: a) IDENTIFY DEVICE data word 78 bit 5 (see 13.2.1.18) shall be set to one; b) the SET FEATURES Select Hardware Feature Control subcommand shall be supported (see 13.3.8); c) page 08h of the Identify Device Data log (see 13.7.7) shall be supported; This patch is not tested on SATA HDD with DevSlp supported. Reported-by: Borislav Petkov <bp@xxxxxxxxx> Signed-off-by: Shane Huang <shane.huang@xxxxxxx> --- drivers/ata/libata-core.c | 3 +-- include/linux/ata.h | 1 + 2 files changed, 2 insertions(+), 2 deletions(-)
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