From mboxrd@z Thu Jan 1 00:00:00 1970 From: Suman Tripathi Subject: [PATCH v0 1/2] libahci: Implement the function restart_engine to restart the port dma engine. Date: Sat, 7 Jun 2014 02:58:53 +0530 Message-ID: <1402090134-23164-2-git-send-email-stripathi@apm.com> References: <1402090134-23164-1-git-send-email-stripathi@apm.com> Return-path: Received: from denmail01-v4020.amcc.com ([192.195.68.30]:37775 "EHLO denmail01.apm.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1752527AbaFFWIb (ORCPT ); Fri, 6 Jun 2014 18:08:31 -0400 In-Reply-To: <1402090134-23164-1-git-send-email-stripathi@apm.com> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: tj@kernel.org, olof@lixom.net, arnd@arndb.de Cc: linux-scsi@vger.kernel.org, linux-ide@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, ddutile@redhat.com, jcm@redhat.com, patches@apm.com, Suman Tripathi , Loc Ho 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 Signed-off-by: Suman Tripathi --- 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