This patch adds an function to restart the port dma engine. This patch also exports the function ahci_qc_issue. The subsequent patches will make use of them. Signed-off-by: Loc Ho <lho@xxxxxxx> Signed-off-by: Suman Tripathi <stripathi@xxxxxxx> --- drivers/ata/ahci.h | 3 ++- drivers/ata/libahci.c | 16 ++++++++++++++-- 2 files changed, 16 insertions(+), 3 deletions(-) diff --git a/drivers/ata/ahci.h b/drivers/ata/ahci.h index af63c75..98e8839 100644 --- a/drivers/ata/ahci.h +++ b/drivers/ata/ahci.h @@ -369,9 +369,10 @@ int ahci_reset_controller(struct ata_host *host); int ahci_do_softreset(struct ata_link *link, unsigned int *class, int pmp, unsigned long deadline, int (*check_ready)(struct ata_link *link)); - +unsigned int ahci_qc_issue(struct ata_queued_cmd *qc); int ahci_stop_engine(struct ata_port *ap); void ahci_start_engine(struct ata_port *ap); +int ahci_restart_engine(struct ata_port *ap); int ahci_check_ready(struct ata_link *link); int ahci_kick_engine(struct ata_port *ap); int ahci_port_resume(struct ata_port *ap); diff --git a/drivers/ata/libahci.c b/drivers/ata/libahci.c index b986145..1b86cf4 100644 --- a/drivers/ata/libahci.c +++ b/drivers/ata/libahci.c @@ -68,7 +68,6 @@ static ssize_t ahci_transmit_led_message(struct ata_port *ap, u32 state, 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_port_start(struct ata_port *ap); static void ahci_port_stop(struct ata_port *ap); @@ -742,6 +741,18 @@ static int ahci_set_lpm(struct ata_link *link, enum ata_lpm_policy policy, return 0; } +int ahci_restart_engine(struct ata_port *ap) +{ + struct ahci_host_priv *hpriv = ap->host->private_data; + + ahci_stop_engine(ap); + ahci_start_fis_rx(ap); + hpriv->start_engine(ap); + + return 0; +} +EXPORT_SYMBOL_GPL(ahci_restart_engine); + #ifdef CONFIG_PM static void ahci_power_down(struct ata_port *ap) { @@ -1940,7 +1951,7 @@ irqreturn_t ahci_interrupt(int irq, void *dev_instance) } EXPORT_SYMBOL_GPL(ahci_interrupt); -static unsigned int ahci_qc_issue(struct ata_queued_cmd *qc) +unsigned int ahci_qc_issue(struct ata_queued_cmd *qc) { struct ata_port *ap = qc->ap; void __iomem *port_mmio = ahci_port_base(ap); @@ -1969,6 +1980,7 @@ static unsigned int ahci_qc_issue(struct ata_queued_cmd *qc) return 0; } +EXPORT_SYMBOL_GPL(ahci_qc_issue); static bool ahci_qc_fill_rtf(struct ata_queued_cmd *qc) { -- 1.8.2.1 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html