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Subject[PATCH 1/3] libata: Stash initial power management configuration
The initial configuration for power management settings may be a result of
the firmware using its knowledge of the installed hardware to program
reasonable defaults. Stash as much of it as possible for later use.

Signed-off-by: Matthew Garrett <mjg59@srcf.ucam.org>
---
drivers/ata/acard-ahci.c | 3 +++
drivers/ata/ahci.c | 3 +++
drivers/ata/ahci.h | 7 +++++++
drivers/ata/libahci.c | 46 +++++++++++++++++++++++++++++++++++-------
drivers/ata/libahci_platform.c | 4 ++++
drivers/ata/libata-core.c | 19 ++++++++++-------
drivers/ata/libata-pmp.c | 2 +-
drivers/ata/libata.h | 2 +-
drivers/ata/sata_highbank.c | 4 ++++
include/linux/libata.h | 3 +++
10 files changed, 77 insertions(+), 16 deletions(-)

diff --git a/drivers/ata/acard-ahci.c b/drivers/ata/acard-ahci.c
index 12489ce..0029229 100644
--- a/drivers/ata/acard-ahci.c
+++ b/drivers/ata/acard-ahci.c
@@ -476,6 +476,9 @@ static int acard_ahci_init_one(struct pci_dev *pdev, const struct pci_device_id
ata_port_pbar_desc(ap, AHCI_PCI_BAR,
0x100 + ap->port_no * 0x80, "port");

+ rc = ahci_setup_port_privdata(ap);
+ if (rc)
+ return rc;
/* set initial link pm policy */
/*
ap->pm_policy = NOT_AVAILABLE;
diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
index c7a92a7..0f875e2 100644
--- a/drivers/ata/ahci.c
+++ b/drivers/ata/ahci.c
@@ -1436,6 +1436,9 @@ static int ahci_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
if (ap->flags & ATA_FLAG_EM)
ap->em_message_type = hpriv->em_msg_type;

+ rc = ahci_setup_port_privdata(ap);
+ if (rc)
+ return rc;

/* disabled/not-implemented port */
if (!(hpriv->port_map & (1 << i)))
diff --git a/drivers/ata/ahci.h b/drivers/ata/ahci.h
index 71262e0..c1a4b6a 100644
--- a/drivers/ata/ahci.h
+++ b/drivers/ata/ahci.h
@@ -313,6 +313,12 @@ struct ahci_port_priv {
/* enclosure management info per PM slot */
struct ahci_em_priv em_priv[EM_MAX_SLOTS];
char *irq_desc; /* desc in /proc/interrupts */
+ bool init_alpe; /* alpe enabled by default */
+ bool init_asp; /* asp enabled by default */
+ bool init_devslp; /* devslp enabled by default */
+ u32 init_dito; /* initial dito configuration */
+ u32 init_deto; /* initial deto configuration */
+ u32 init_mdat; /* initial mdat configuration */
};

struct ahci_host_priv {
@@ -371,6 +377,7 @@ extern struct ata_port_operations ahci_platform_ops;
extern struct ata_port_operations ahci_pmp_retry_srst_ops;

unsigned int ahci_dev_classify(struct ata_port *ap);
+int ahci_setup_port_privdata(struct ata_port *ap);
void ahci_fill_cmd_slot(struct ahci_port_priv *pp, unsigned int tag,
u32 opts);
void ahci_save_initial_config(struct device *dev,
diff --git a/drivers/ata/libahci.c b/drivers/ata/libahci.c
index 61a9c07..f0c7120 100644
--- a/drivers/ata/libahci.c
+++ b/drivers/ata/libahci.c
@@ -2212,19 +2212,53 @@ static int ahci_port_suspend(struct ata_port *ap, pm_message_t mesg)
}
#endif

+/*
+ * Allocate port privdata and read back initial power management configuration
+ */
+int ahci_setup_port_privdata(struct ata_port *ap)
+{
+ struct ahci_port_priv *pp;
+ u32 cmd, devslp;
+ void __iomem *port_mmio = ahci_port_base(ap);
+
+ pp = kzalloc(sizeof(*pp), GFP_KERNEL);
+ if (!pp)
+ return -ENOMEM;
+
+ ap->private_data = pp;
+
+ cmd = readl(port_mmio + PORT_CMD);
+
+ if (cmd & PORT_CMD_ALPE)
+ pp->init_alpe = true;
+
+ if (cmd & PORT_CMD_ASP)
+ pp->init_asp = true;
+
+ devslp = readl(port_mmio + PORT_DEVSLP);
+
+ /* devslp unsupported or disabled */
+ if (!(devslp & PORT_DEVSLP_DSP) || !(devslp & PORT_DEVSLP_ADSE))
+ return 0;
+
+ pp->init_devslp = true;
+ pp->init_dito = (devslp >> PORT_DEVSLP_DITO_OFFSET) & 0x3ff;
+ pp->init_deto = (devslp >> PORT_DEVSLP_DETO_OFFSET) & 0xff;
+ pp->init_mdat = (devslp >> PORT_DEVSLP_MDAT_OFFSET) & 0x1f;
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(ahci_setup_port_privdata);
+
static int ahci_port_start(struct ata_port *ap)
{
struct ahci_host_priv *hpriv = ap->host->private_data;
+ struct ahci_port_priv *pp = ap->private_data;
struct device *dev = ap->host->dev;
- struct ahci_port_priv *pp;
void *mem;
dma_addr_t mem_dma;
size_t dma_sz, rx_fis_sz;

- pp = devm_kzalloc(dev, sizeof(*pp), GFP_KERNEL);
- if (!pp)
- return -ENOMEM;
-
if (ap->host->n_ports > 1) {
pp->irq_desc = devm_kzalloc(dev, 8, GFP_KERNEL);
if (!pp->irq_desc) {
@@ -2303,8 +2337,6 @@ static int ahci_port_start(struct ata_port *ap)
ap->lock = &pp->lock;
}

- ap->private_data = pp;
-
/* engage engines, captain */
return ahci_port_resume(ap);
}
diff --git a/drivers/ata/libahci_platform.c b/drivers/ata/libahci_platform.c
index d89305d..39946d4 100644
--- a/drivers/ata/libahci_platform.c
+++ b/drivers/ata/libahci_platform.c
@@ -563,6 +563,10 @@ int ahci_platform_init_host(struct platform_device *pdev,
if (ap->flags & ATA_FLAG_EM)
ap->em_message_type = hpriv->em_msg_type;

+ rc = ahci_setup_port_privdata(ap);
+ if (rc)
+ return rc;
+
/* disabled/not-implemented port */
if (!(hpriv->port_map & (1 << i)))
ap->ops = &ata_dummy_port_ops;
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index f6cb1f1..c037f33 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -2024,6 +2024,9 @@ retry:
}
}

+ if (id[79] & SATA_DIPM)
+ dev->init_dipm = true;
+
*p_class = class;

return 0;
@@ -5583,11 +5586,11 @@ void ata_link_init(struct ata_port *ap, struct ata_link *link, int pmp)
}

/**
- * sata_link_init_spd - Initialize link->sata_spd_limit
- * @link: Link to configure sata_spd_limit for
+ * sata_link_init_config - Initialize link->sata_spd_limit and init_lpm
+ * @link: Link to configure sata_spd_limit and init_lpm for
*
- * Initialize @link->[hw_]sata_spd_limit to the currently
- * configured value.
+ * Initialize @link->[hw_]sata_spd_limit and @link->init_lpm to the
+ * currently configured value.
*
* LOCKING:
* Kernel thread context (may sleep).
@@ -5595,7 +5598,7 @@ void ata_link_init(struct ata_port *ap, struct ata_link *link, int pmp)
* RETURNS:
* 0 on success, -errno on failure.
*/
-int sata_link_init_spd(struct ata_link *link)
+int sata_link_init_config(struct ata_link *link)
{
u8 spd;
int rc;
@@ -5612,6 +5615,8 @@ int sata_link_init_spd(struct ata_link *link)

link->sata_spd_limit = link->hw_sata_spd_limit;

+ link->init_lpm = (link->saved_scontrol >> 8) & 0x7;
+
return 0;
}

@@ -6161,9 +6166,9 @@ int ata_host_register(struct ata_host *host, struct scsi_host_template *sht)
ap->cbl = ATA_CBL_SATA;

/* init sata_spd_limit to the current value */
- sata_link_init_spd(&ap->link);
+ sata_link_init_config(&ap->link);
if (ap->slave_link)
- sata_link_init_spd(ap->slave_link);
+ sata_link_init_config(ap->slave_link);

/* print per-port info to dmesg */
xfer_mask = ata_pack_xfermask(ap->pio_mask, ap->mwdma_mask,
diff --git a/drivers/ata/libata-pmp.c b/drivers/ata/libata-pmp.c
index 7ccc084..b9f7ce8 100644
--- a/drivers/ata/libata-pmp.c
+++ b/drivers/ata/libata-pmp.c
@@ -531,7 +531,7 @@ int sata_pmp_attach(struct ata_device *dev)
ap->ops->pmp_attach(ap);

ata_for_each_link(tlink, ap, EDGE)
- sata_link_init_spd(tlink);
+ sata_link_init_config(tlink);

return 0;

diff --git a/drivers/ata/libata.h b/drivers/ata/libata.h
index a998a17..35016d6 100644
--- a/drivers/ata/libata.h
+++ b/drivers/ata/libata.h
@@ -99,7 +99,7 @@ extern bool ata_phys_link_online(struct ata_link *link);
extern bool ata_phys_link_offline(struct ata_link *link);
extern void ata_dev_init(struct ata_device *dev);
extern void ata_link_init(struct ata_port *ap, struct ata_link *link, int pmp);
-extern int sata_link_init_spd(struct ata_link *link);
+extern int sata_link_init_config(struct ata_link *link);
extern int ata_task_ioctl(struct scsi_device *scsidev, void __user *arg);
extern int ata_cmd_ioctl(struct scsi_device *scsidev, void __user *arg);
extern struct ata_port *ata_port_alloc(struct ata_host *host);
diff --git a/drivers/ata/sata_highbank.c b/drivers/ata/sata_highbank.c
index 24e311f..a2adf3f 100644
--- a/drivers/ata/sata_highbank.c
+++ b/drivers/ata/sata_highbank.c
@@ -556,6 +556,10 @@ static int ahci_highbank_probe(struct platform_device *pdev)
if (ap->flags & ATA_FLAG_EM)
ap->em_message_type = hpriv->em_msg_type;

+ rc = ahci_setup_port_privdata(ap);
+ if (rc)
+ goto err0;
+
/* disabled/not-implemented port */
if (!(hpriv->port_map & (1 << i)))
ap->ops = &ata_dummy_port_ops;
diff --git a/include/linux/libata.h b/include/linux/libata.h
index 8dad4a3..31c149b 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -719,6 +719,8 @@ struct ata_device {
int spdn_cnt;
/* ering is CLEAR_END, read comment above CLEAR_END */
struct ata_ering ering;
+ /* Initial DIPM configuration */
+ bool init_dipm;
};

/* Fields between ATA_DEVICE_CLEAR_BEGIN and ATA_DEVICE_CLEAR_END are
@@ -788,6 +790,7 @@ struct ata_link {
struct ata_eh_context eh_context;

struct ata_device device[ATA_MAX_DEVICES];
+ u8 init_lpm; /* initial lpm configuration */
};
#define ATA_LINK_CLEAR_BEGIN offsetof(struct ata_link, active_tag)
#define ATA_LINK_CLEAR_END offsetof(struct ata_link, device[0])
--
2.3.5


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