On Sun, 2005-07-10 at 15:19 -0700, Micheal Marineau wrote:
> I've been forward porting this patch for a while now and need
> some input on it. You can see the last time someone posted it
> to the list here:
> http://www.ussg.iu.edu/hypermail/linux/kernel/0410.0/0600.html
>
> The big issue mentioned in that thread, that it reqires a key
> press during the resume process to keep going still exists and
> I have been unable to understand why. The issue is in radeon_pm.c
> in this block that follows the last hunk of the diff:
>
> if (rinfo->no_schedule) {
> if (try_acquire_console_sem())
> return 0;
> } else
> acquire_console_sem();
>
> Specificly it's acquire_console_sem(); where the resume stops waiting
> for a key press. What could be stopping things?
I don't see any reason for that. That definitely shouldn't happen.
.../...
> diff -ru linux-2.6.12.orig/drivers/video/aty/radeon_pm.c
> linux-2.6.12/drivers/video/aty/radeon_pm.c
> --- linux-2.6.12.orig/drivers/video/aty/radeon_pm.c 2005-06-17
> 12:48:29.000000000 -0700
> +++ linux-2.6.12/drivers/video/aty/radeon_pm.c 2005-07-03
> 19:55:36.000000000 -0700
> @@ -2606,10 +2606,13 @@
>
> done:
> pdev->dev.power.power_state = state;
> + pci_save_state (pdev);
>
> return 0;
> }
Hrm... radeonfb already saves the config space elsewhere. Note that it
could maybe be converted to pci_save_state() / pci_restore_state() but
currently, I do my own as I use that for "testing" if the card is still
in it's previous state or was shut down. (I could probably use the
content of a register instead, like CLK_PIN_CNTL)
> +extern void acpi_vgapost (unsigned long slot);
> +
> int radeonfb_pci_resume(struct pci_dev *pdev)
> {
> struct fb_info *info = pci_get_drvdata(pdev);
> @@ -2619,6 +2622,12 @@
> if (pdev->dev.power.power_state == 0)
> return 0;
>
> + if (pdev->dev.power.power_state != 4)
> + {
> + pci_restore_state (pdev);
> + acpi_vgapost (pdev->devfn);
> + }
> +
> if (rinfo->no_schedule) {
> if (try_acquire_console_sem())
> return 0;
The above will probably blow up anything that is not an x86 with ACPI.
Besides there is already a mecanism in that file for calling functions
for re-posting cards (since I have code to explicitely re-post rv280 and
rv350 mobility on macs), you should hook into that existing mecanism
when you detect ACPI.
Ben.
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