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authorTejun Heo <htejun@gmail.com>2007-11-27 19:43:48 +0900
committerJeff Garzik <jeff@garzik.org>2008-01-23 05:24:12 -0500
commitc88f90c3779cd5e710f2acdf59ad2bd0380de98d (patch)
tree7b3d7464f03d2abdc105d07728cab0df67262a25
parent7dc951aefdc1dc20228691b04867fb6195864d67 (diff)
downloadop-kernel-dev-c88f90c3779cd5e710f2acdf59ad2bd0380de98d.zip
op-kernel-dev-c88f90c3779cd5e710f2acdf59ad2bd0380de98d.tar.gz
libata: add ATA_CBL_PATA_IGN
ATA_CBL_PATA_UNK indicates that the cable type can't be determined from the host side and might be either 80c or 40c. libata applies drive or other generic limit in this case. However, there are controllers where both host and drive side detections are misimplemented and the driver has to rely solely on private method - peeking BIOS or ACPI configuration or using some other private mechanism. This patch adds ATA_CBL_PATA_IGN which tells libata to ignore the cable type completely and just let the LLD determine the transfer mode via host transfer mode masks and ->mode_filter(). Signed-off-by: Tejun Heo <htejun@gmail.com> Cc: Alan Cox <alan@lxorguk.ukuu.org.uk> Signed-off-by: Jeff Garzik <jeff@garzik.org>
-rw-r--r--drivers/ata/libata-core.c13
-rw-r--r--include/linux/ata.h7
-rw-r--r--include/linux/libata.h1
3 files changed, 18 insertions, 3 deletions
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 7115953..62c4b32 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -2354,6 +2354,18 @@ int ata_cable_unknown(struct ata_port *ap)
}
/**
+ * ata_cable_ignore - return ignored PATA cable.
+ * @ap: port
+ *
+ * Helper method for drivers which don't use cable type to limit
+ * transfer mode.
+ */
+int ata_cable_ignore(struct ata_port *ap)
+{
+ return ATA_CBL_PATA_IGN;
+}
+
+/**
* ata_cable_sata - return SATA cable type
* @ap: port
*
@@ -7665,4 +7677,5 @@ EXPORT_SYMBOL_GPL(ata_dev_try_classify);
EXPORT_SYMBOL_GPL(ata_cable_40wire);
EXPORT_SYMBOL_GPL(ata_cable_80wire);
EXPORT_SYMBOL_GPL(ata_cable_unknown);
+EXPORT_SYMBOL_GPL(ata_cable_ignore);
EXPORT_SYMBOL_GPL(ata_cable_sata);
diff --git a/include/linux/ata.h b/include/linux/ata.h
index 43fecf6..c17e940 100644
--- a/include/linux/ata.h
+++ b/include/linux/ata.h
@@ -286,9 +286,10 @@ enum {
ATA_CBL_NONE = 0,
ATA_CBL_PATA40 = 1,
ATA_CBL_PATA80 = 2,
- ATA_CBL_PATA40_SHORT = 3, /* 40 wire cable to high UDMA spec */
- ATA_CBL_PATA_UNK = 4,
- ATA_CBL_SATA = 5,
+ ATA_CBL_PATA40_SHORT = 3, /* 40 wire cable to high UDMA spec */
+ ATA_CBL_PATA_UNK = 4, /* don't know, maybe 80c? */
+ ATA_CBL_PATA_IGN = 5, /* don't know, ignore cable handling */
+ ATA_CBL_SATA = 6,
/* SATA Status and Control Registers */
SCR_STATUS = 0,
diff --git a/include/linux/libata.h b/include/linux/libata.h
index d9eb20c..bdb7c6e 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -927,6 +927,7 @@ extern u8 ata_irq_on(struct ata_port *ap);
extern int ata_cable_40wire(struct ata_port *ap);
extern int ata_cable_80wire(struct ata_port *ap);
extern int ata_cable_sata(struct ata_port *ap);
+extern int ata_cable_ignore(struct ata_port *ap);
extern int ata_cable_unknown(struct ata_port *ap);
/*
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