ahci: add AHCI_HFLAG_DELAY_ENGINE host flag

The following commit was intended to fix problems with specific AHCI
controller(s) that would become bricks if the AHCI specification was not
followed strictly (that is, if ahci_start_engine() was called while the
controller was in the wrong state):

    commit 7faa33da9b7add01db9f1ad92c6a5d9145e940a7
    ahci: start engine only during soft/hard resets

However, some devices currently have issues with that fix, so we must
implement a flag that delays the ahci_start_engine() call only for specific
controllers.

This commit simply introduces the flag, without enabling it in any driver.

Note that even when AHCI_HFLAG_DELAY_ENGINE is not enabled, this patch does
not constitue a full revert to commit 7faa33da; there is still a change in
behavior to the ahci_port_suspend() failure path.

Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Cc: stable@kernel.org

2 files changed, 8 insertions, 0 deletions

diff --git a/drivers/ata/ahci.h b/drivers/ata/ahci.h
index b1750007c8dc..feb127ef4e4e 100644
--- a/drivers/ata/ahci.h
+++ b/drivers/ata/ahci.h
@@ -210,6 +210,9 @@ enum {
         AHCI_HFLAG_NO_SNTF              = (1 << 12), /* no sntf */
         AHCI_HFLAG_NO_FPDMA_AA          = (1 << 13), /* no FPDMA AA */
         AHCI_HFLAG_YES_FBS              = (1 << 14), /* force FBS cap on */
+        AHCI_HFLAG_DELAY_ENGINE         = (1 << 15), /* do not start engine on
+                                                        port start (wait until
+                                                        error-handling stage) */
 
         /* ap->flags bits */
 
diff --git a/drivers/ata/libahci.c b/drivers/ata/libahci.c
index a72bfd0ecfee..f9eaa82311a9 100644
--- a/drivers/ata/libahci.c
+++ b/drivers/ata/libahci.c
@@ -737,6 +737,7 @@ static void ahci_power_down(struct ata_port *ap)
 
 static void ahci_start_port(struct ata_port *ap)
 {
+        struct ahci_host_priv *hpriv = ap->host->private_data;
         struct ahci_port_priv *pp = ap->private_data;
         struct ata_link *link;
         struct ahci_em_priv *emp;
@@ -746,6 +747,10 @@ static void ahci_start_port(struct ata_port *ap)
         /* enable FIS reception */
         ahci_start_fis_rx(ap);
 
+        /* enable DMA */
+        if (!(hpriv->flags & AHCI_HFLAG_DELAY_ENGINE))
+                ahci_start_engine(ap);
+
         /* turn on LEDs */
         if (ap->flags & ATA_FLAG_EM) {
                 ata_for_each_link(link, ap, EDGE) {