From 008a78961ec72990d09d7625ef9499d7317d040d Mon Sep 17 00:00:00 2001 From: Tejun Heo Date: Mon, 16 Jul 2007 14:29:40 +0900 Subject: libata: improve SATA PHY speed down logic sata_down_spd_limit() first reads the current SPD from SStatus and limit the speed to the lower one of one below the current limit or one below the current SPD in SStatus. SPD may not be accessible or valid when SPD down is requested making sata_down_spd_limit() fail when it's most needed. This patch makes the current SPD cached after each successful reset and forces GEN I speed (1.5Gbps) if neither of SStatus or the cached value is valid, so sata_down_spd_limit() is now guaranteed to lower the speed limit if lower speed is available. Signed-off-by: Tejun Heo Signed-off-by: Jeff Garzik --- include/linux/libata.h | 1 + 1 file changed, 1 insertion(+) (limited to 'include/linux') diff --git a/include/linux/libata.h b/include/linux/libata.h index c732b3e78e28..16ebdf152c75 100644 --- a/include/linux/libata.h +++ b/include/linux/libata.h @@ -531,6 +531,7 @@ struct ata_port { unsigned int cbl; /* cable type; ATA_CBL_xxx */ unsigned int hw_sata_spd_limit; unsigned int sata_spd_limit; /* SATA PHY speed limit */ + unsigned int sata_spd; /* current SATA PHY speed */ /* record runtime error info, protected by host lock */ struct ata_eh_info eh_info; -- cgit v1.2.1