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SubjectRe: 2.6.32.2 SATA link detect failed, 2.6.32.1 works fine
Hello,

On 12/24/2009 09:15 PM, fengxiangjun wrote:
> Here is it, and I hope it help. And merry xmas, ;)
>
> ata1.00: SATA link down (SStatus 0 SControl 301)

Hmmm... SControl DET hasn't been cleared. Does the attached patch
make any difference?

--
tejun
diff --git a/drivers/ata/ata_piix.c b/drivers/ata/ata_piix.c
index 19136a7..5bc31d2 100644
--- a/drivers/ata/ata_piix.c
+++ b/drivers/ata/ata_piix.c
@@ -173,6 +173,8 @@ static int piix_sidpr_scr_read(struct ata_link *link,
unsigned int reg, u32 *val);
static int piix_sidpr_scr_write(struct ata_link *link,
unsigned int reg, u32 val);
+static int piix_sidpr_hardreset(struct ata_link *link, unsigned int *class,
+ unsigned long deadline);
#ifdef CONFIG_PM
static int piix_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg);
static int piix_pci_device_resume(struct pci_dev *pdev);
@@ -334,9 +336,9 @@ static struct ata_port_operations piix_sata_ops = {

static struct ata_port_operations piix_sidpr_sata_ops = {
.inherits = &piix_sata_ops,
- .hardreset = sata_std_hardreset,
.scr_read = piix_sidpr_scr_read,
.scr_write = piix_sidpr_scr_write,
+ .hardreset = piix_sidpr_hardreset,
};

static const struct piix_map_db ich5_map_db = {
@@ -962,6 +964,18 @@ static int piix_sidpr_scr_write(struct ata_link *link,
return 0;
}

+static int piix_sidpr_hardreset(struct ata_link *link, unsigned int *class,
+ unsigned long deadline)
+{
+ const unsigned long *timing = sata_deb_timing_hotplug;
+ bool online;
+ int rc;
+
+ /* do hardreset */
+ rc = sata_link_hardreset(link, timing, deadline, &online, NULL);
+ return online ? -EAGAIN : rc;
+}
+
#ifdef CONFIG_PM
static int piix_broken_suspend(void)
{
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 22ff51b..bb19319 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -3731,7 +3731,7 @@ int sata_link_debounce(struct ata_link *link, const unsigned long *params,
unsigned long interval = params[0];
unsigned long duration = params[1];
unsigned long last_jiffies, t;
- u32 last, cur;
+ u32 last, cur, xxx;
int rc;

t = ata_deadline(jiffies, params[2]);
@@ -3740,7 +3740,9 @@ int sata_link_debounce(struct ata_link *link, const unsigned long *params,

if ((rc = sata_scr_read(link, SCR_STATUS, &cur)))
return rc;
+ xxx = cur;
cur &= 0xf;
+ ata_link_printk(link, KERN_INFO, "XXX debounce start, SStatus=%x\n", xxx);

last = cur;
last_jiffies = jiffies;
@@ -3749,6 +3751,7 @@ int sata_link_debounce(struct ata_link *link, const unsigned long *params,
msleep(interval);
if ((rc = sata_scr_read(link, SCR_STATUS, &cur)))
return rc;
+ xxx = cur;
cur &= 0xf;

/* DET stable? */
@@ -3756,8 +3759,12 @@ int sata_link_debounce(struct ata_link *link, const unsigned long *params,
if (cur == 1 && time_before(jiffies, deadline))
continue;
if (time_after(jiffies,
- ata_deadline(last_jiffies, duration)))
+ ata_deadline(last_jiffies, duration))) {
+ ata_link_printk(link, KERN_INFO,
+ "XXX debounce done, SStatus=%x, DET stable for %u msecs\n",
+ xxx, jiffies_to_msecs(jiffies - last_jiffies));
return 0;
+ }
continue;
}

@@ -3791,15 +3798,30 @@ int sata_link_resume(struct ata_link *link, const unsigned long *params,
unsigned long deadline)
{
u32 scontrol, serror;
- int rc;
+ int tries = 3, rc;

if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
return rc;

- scontrol = (scontrol & 0x0f0) | 0x300;
+ do {
+ scontrol = (scontrol & 0x0f0) | 0x300;

- if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
- return rc;
+ if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
+ return rc;
+
+ if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
+ return rc;
+
+ /* is SControl restored correctly? */
+ if ((scontrol & 0xf0f) != 0x300)
+ break;
+
+ msleep(100);
+
+ ata_link_printk(link, KERN_WARNING,
+ "failed to restore SControl=%x%s\n",
+ scontrol, tries > 1 ? ", retrying" : "");
+ } while (--tries);

/* Some PHYs react badly if SStatus is pounded immediately
* after resuming. Delay 200ms before debouncing.
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