lkml.org 
[lkml]   [2018]   [Apr]   [25]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 1/2] libahci: Allow drivers to override stop_engine
Date
From: Evan Wang <xswang@marvell.com>

Marvell armada37xx, armada7k and armada8k share the same
AHCI sata controller IP, and currently there is an issue
(Errata Ref#226)that the SATA can not be detected via SATA
Port-MultiPlayer(PMP). After debugging, the reason is
found that the value of Port-x FIS-based Switching Control
(PxFBS@0x40) became wrong.
According to design, the bits[11:8, 0] of register PxFBS
are cleared when Port Command and Status (0x18) bit[0]
changes its value from 1 to 0, i.e. falling edge of Port
Command and Status bit[0] sends PULSE that resets PxFBS
bits[11:8; 0].
So it needs save the port PxFBS register before PxCMD
ST write and restore the port PxFBS register afterwards
in ahci_stop_engine().

This commit allows drivers to override ahci_stop_engine
behavior for use by the Marvell AHCI driver(and potentially
other drivers in the future).

Signed-off-by: Evan Wang <xswang@marvell.com>
Suggested-by: Ofer Heifetz <oferh@marvell.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Cc: stable@vger.kernel.org
---
drivers/ata/ahci.c | 6 +++---
drivers/ata/ahci.h | 7 +++++++
drivers/ata/ahci_qoriq.c | 2 +-
drivers/ata/ahci_xgene.c | 4 ++--
drivers/ata/libahci.c | 20 ++++++++++++--------
drivers/ata/sata_highbank.c | 2 +-
6 files changed, 26 insertions(+), 15 deletions(-)

diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
index 1ff1779..6389c88 100644
--- a/drivers/ata/ahci.c
+++ b/drivers/ata/ahci.c
@@ -698,7 +698,7 @@ static int ahci_vt8251_hardreset(struct ata_link *link, unsigned int *class,

DPRINTK("ENTER\n");

- ahci_stop_engine(ap);
+ hpriv->stop_engine(ap);

rc = sata_link_hardreset(link, sata_ehc_deb_timing(&link->eh_context),
deadline, &online, NULL);
@@ -724,7 +724,7 @@ static int ahci_p5wdh_hardreset(struct ata_link *link, unsigned int *class,
bool online;
int rc;

- ahci_stop_engine(ap);
+ hpriv->stop_engine(ap);

/* clear D2H reception area to properly wait for D2H FIS */
ata_tf_init(link->device, &tf);
@@ -788,7 +788,7 @@ static int ahci_avn_hardreset(struct ata_link *link, unsigned int *class,

DPRINTK("ENTER\n");

- ahci_stop_engine(ap);
+ hpriv->stop_engine(ap);

for (i = 0; i < 2; i++) {
u16 val;
diff --git a/drivers/ata/ahci.h b/drivers/ata/ahci.h
index 4356ef1..7d88ede 100644
--- a/drivers/ata/ahci.h
+++ b/drivers/ata/ahci.h
@@ -366,6 +366,13 @@ struct ahci_host_priv {
* be overridden anytime before the host is activated.
*/
void (*start_engine)(struct ata_port *ap);
+ /*
+ * Optional ahci_stop_engine override, if not set this gets set to the
+ * default ahci_stop_engine during ahci_save_initial_config, this can
+ * be overridden anytime before the host is activated.
+ */
+ int (*stop_engine)(struct ata_port *ap);
+
irqreturn_t (*irq_handler)(int irq, void *dev_instance);

/* only required for per-port MSI(-X) support */
diff --git a/drivers/ata/ahci_qoriq.c b/drivers/ata/ahci_qoriq.c
index 2685f28..cfdef4d 100644
--- a/drivers/ata/ahci_qoriq.c
+++ b/drivers/ata/ahci_qoriq.c
@@ -96,7 +96,7 @@ static int ahci_qoriq_hardreset(struct ata_link *link, unsigned int *class,

DPRINTK("ENTER\n");

- ahci_stop_engine(ap);
+ hpriv->stop_engine(ap);

/*
* There is a errata on ls1021a Rev1.0 and Rev2.0 which is:
diff --git a/drivers/ata/ahci_xgene.c b/drivers/ata/ahci_xgene.c
index c2b5941..ad58da7 100644
--- a/drivers/ata/ahci_xgene.c
+++ b/drivers/ata/ahci_xgene.c
@@ -165,7 +165,7 @@ static int xgene_ahci_restart_engine(struct ata_port *ap)
PORT_CMD_ISSUE, 0x0, 1, 100))
return -EBUSY;

- ahci_stop_engine(ap);
+ hpriv->stop_engine(ap);
ahci_start_fis_rx(ap);

/*
@@ -421,7 +421,7 @@ static int xgene_ahci_hardreset(struct ata_link *link, unsigned int *class,
portrxfis_saved = readl(port_mmio + PORT_FIS_ADDR);
portrxfishi_saved = readl(port_mmio + PORT_FIS_ADDR_HI);

- ahci_stop_engine(ap);
+ hpriv->stop_engine(ap);

rc = xgene_ahci_do_hardreset(link, deadline, &online);

diff --git a/drivers/ata/libahci.c b/drivers/ata/libahci.c
index 7adcf3c..e5d9097 100644
--- a/drivers/ata/libahci.c
+++ b/drivers/ata/libahci.c
@@ -560,6 +560,9 @@ void ahci_save_initial_config(struct device *dev, struct ahci_host_priv *hpriv)
if (!hpriv->start_engine)
hpriv->start_engine = ahci_start_engine;

+ if (!hpriv->stop_engine)
+ hpriv->stop_engine = ahci_stop_engine;
+
if (!hpriv->irq_handler)
hpriv->irq_handler = ahci_single_level_irq_intr;
}
@@ -897,9 +900,10 @@ static void ahci_start_port(struct ata_port *ap)
static int ahci_deinit_port(struct ata_port *ap, const char **emsg)
{
int rc;
+ struct ahci_host_priv *hpriv = ap->host->private_data;

/* disable DMA */
- rc = ahci_stop_engine(ap);
+ rc = hpriv->stop_engine(ap);
if (rc) {
*emsg = "failed to stop engine";
return rc;
@@ -1310,7 +1314,7 @@ int ahci_kick_engine(struct ata_port *ap)
int busy, rc;

/* stop engine */
- rc = ahci_stop_engine(ap);
+ rc = hpriv->stop_engine(ap);
if (rc)
goto out_restart;

@@ -1549,7 +1553,7 @@ int ahci_do_hardreset(struct ata_link *link, unsigned int *class,

DPRINTK("ENTER\n");

- ahci_stop_engine(ap);
+ hpriv->stop_engine(ap);

/* clear D2H reception area to properly wait for D2H FIS */
ata_tf_init(link->device, &tf);
@@ -2075,14 +2079,14 @@ void ahci_error_handler(struct ata_port *ap)

if (!(ap->pflags & ATA_PFLAG_FROZEN)) {
/* restart engine */
- ahci_stop_engine(ap);
+ hpriv->stop_engine(ap);
hpriv->start_engine(ap);
}

sata_pmp_error_handler(ap);

if (!ata_dev_enabled(ap->link.device))
- ahci_stop_engine(ap);
+ hpriv->stop_engine(ap);
}
EXPORT_SYMBOL_GPL(ahci_error_handler);

@@ -2129,7 +2133,7 @@ static void ahci_set_aggressive_devslp(struct ata_port *ap, bool sleep)
return;

/* set DITO, MDAT, DETO and enable DevSlp, need to stop engine first */
- rc = ahci_stop_engine(ap);
+ rc = hpriv->stop_engine(ap);
if (rc)
return;

@@ -2189,7 +2193,7 @@ static void ahci_enable_fbs(struct ata_port *ap)
return;
}

- rc = ahci_stop_engine(ap);
+ rc = hpriv->stop_engine(ap);
if (rc)
return;

@@ -2222,7 +2226,7 @@ static void ahci_disable_fbs(struct ata_port *ap)
return;
}

- rc = ahci_stop_engine(ap);
+ rc = hpriv->stop_engine(ap);
if (rc)
return;

diff --git a/drivers/ata/sata_highbank.c b/drivers/ata/sata_highbank.c
index aafb8cc..e67815b 100644
--- a/drivers/ata/sata_highbank.c
+++ b/drivers/ata/sata_highbank.c
@@ -410,7 +410,7 @@ static int ahci_highbank_hardreset(struct ata_link *link, unsigned int *class,
int rc;
int retry = 100;

- ahci_stop_engine(ap);
+ hpriv->stop_engine(ap);

/* clear D2H reception area to properly wait for D2H FIS */
ata_tf_init(link->device, &tf);
--
1.9.1
\
 
 \ /
  Last update: 2018-04-25 06:32    [W:0.047 / U:2.016 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site