This patch implements the function restart_engine function to add the flexibility to restart the port dma engine from the libata framework.
Signed-off-by: Loc Ho <[email protected]> Signed-off-by: Suman Tripathi <[email protected]> --- drivers/ata/libahci.c | 11 +++++++++++ include/linux/libata.h | 1 + 2 files changed, 12 insertions(+) diff --git a/drivers/ata/libahci.c b/drivers/ata/libahci.c index b986145..5f9a13e 100644 --- a/drivers/ata/libahci.c +++ b/drivers/ata/libahci.c @@ -70,6 +70,7 @@ static int ahci_scr_read(struct ata_link *link, unsigned int sc_reg, u32 *val); static int ahci_scr_write(struct ata_link *link, unsigned int sc_reg, u32 val); static unsigned int ahci_qc_issue(struct ata_queued_cmd *qc); static bool ahci_qc_fill_rtf(struct ata_queued_cmd *qc); +static int ahci_restart_engine(struct ata_port *ap); static int ahci_port_start(struct ata_port *ap); static void ahci_port_stop(struct ata_port *ap); static void ahci_qc_prep(struct ata_queued_cmd *qc); @@ -178,6 +179,7 @@ struct ata_port_operations ahci_ops = { #endif .port_start = ahci_port_start, .port_stop = ahci_port_stop, + .restart_engine = ahci_restart_engine, }; EXPORT_SYMBOL_GPL(ahci_ops); @@ -2362,6 +2364,15 @@ static int ahci_port_start(struct ata_port *ap) return ahci_port_resume(ap); } +static int ahci_restart_engine(struct ata_port *ap) +{ + ahci_stop_engine(ap); + ahci_start_fis_rx(ap); + ahci_start_engine(ap); + + return 0; +} + static void ahci_port_stop(struct ata_port *ap) { const char *emsg = NULL; diff --git a/include/linux/libata.h b/include/linux/libata.h index 5ab4e3a..42ab826 100644 --- a/include/linux/libata.h +++ b/include/linux/libata.h @@ -918,6 +918,7 @@ struct ata_port_operations { void (*pmp_detach)(struct ata_port *ap); int (*set_lpm)(struct ata_link *link, enum ata_lpm_policy policy, unsigned hints); + int (*restart_engine) (struct ata_port *ap); /* * Start, stop, suspend and resume -- 1.8.2.1 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
