On Thu, Aug 10, 2006 at 11:55:09AM +0200, Sheer El-Showk wrote:
> piix 9092 0 [permanent]
> ide_core 115900 3 ide_cd,piix,ide_disk
>
> Your patch was at the more general level of the ide drivers so do you
> have any idea why it didn't work on this particular driver?
Not offhand, no. But I'll tell what I did; maybe it'll help you narrow
down your problem.
I found that ide-io.c has some useful debug printks at strategic points.
They were bitrotted and needed to be enabled by hand. the patch below
fixes this: it puts the ide-layer suspend/resume printks under
CONFIG_PM_DEBUG and gets them compiling again.
Another thing that helped me was to compare the output of
/proc/ide/amd74xx before suspend and at different points during resume.
I hacked in a routine that would call the procfs read() function and
then printk the buffer. That way I could see the state of the chipset at
arbitary points.
Unfortunately piix.c doesn't seem to implement a procfs file like that.
Another thing to check is whether pci_restore_config() is producing any
"PM: Writing back config space on X" messages for that device - if so,
it means the pci config space was changed by the STR and so other things
might need to be set up again.
You could read the suspend/resume implementation for sc1200.c. It's the
only driver in drivers/ide/pci that has one.
I'm told that on x86 there can be ACPI hooks that are supposed to be
called by the OS on suspend/resume and linux currently doesn't support
these. There are patches floating around to do that. Check list archives
and various distro/kernel bugzillas.
Jason
---
drivers/ide/ide-io.c | 14 +++++++-------
1 file changed, 7 insertions(+), 7 deletions(-)
Index: linux-2.6.18-rc2-git6/drivers/ide/ide-io.c
===================================================================
--- linux-2.6.18-rc2-git6.orig/drivers/ide/ide-io.c
+++ linux-2.6.18-rc2-git6/drivers/ide/ide-io.c
@@ -290,7 +290,7 @@
{
unsigned long flags;
-#ifdef DEBUG_PM
+#ifdef CONFIG_PM_DEBUG
printk("%s: completing PM request, %s\n", drive->name,
blk_pm_suspend_request(rq) ? "suspend" : "resume");
#endif
@@ -422,9 +422,9 @@
}
} else if (blk_pm_request(rq)) {
struct request_pm_state *pm = rq->end_io_data;
-#ifdef DEBUG_PM
- printk("%s: complete_power_step(step: %d, stat: %x, err: %x)\n",
- drive->name, rq->pm->pm_step, stat, err);
+#ifdef CONFIG_PM_DEBUG
+ printk("%s: complete_power_step(step: %d, stat: 0x%x, err:
0x%x)\n",
+ drive->name, pm->pm_step, stat, err);
#endif
ide_complete_power_step(drive, rq, stat, err);
if (pm->pm_step == ide_pm_state_completed)
@@ -950,7 +950,7 @@
* point.
*/
int rc;
-#ifdef DEBUG_PM
+#ifdef CONFIG_PM_DEBUG
printk("%s: Wakeup request inited, waiting for !BSY...\n",
drive->name);
#endif
rc = ide_wait_not_busy(HWIF(drive), 35000);
@@ -1017,9 +1017,9 @@
return execute_drive_cmd(drive, rq);
else if (blk_pm_request(rq)) {
struct request_pm_state *pm = rq->end_io_data;
-#ifdef DEBUG_PM
+#ifdef CONFIG_PM_DEBUG
printk("%s: start_power_step(step: %d)\n",
- drive->name, rq->pm->pm_step);
+ drive->name, pm->pm_step);
#endif
startstop = ide_start_power_step(drive, rq);
if (startstop == ide_stopped &&
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