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);