atyfb: Properly save PCI state before changing PCI PM level

This fixes atyfb to properly save the PCI config space -before- it
potentially switches the PM state of the chip. This avoids a
warning with the new PM core and is the right thing to do anyway.

I also slightly cleaned up the code that checks whether we are
running on a PowerMac to do a runtime check instead of a compile
check only, and replaced a deprecated number with the proper
symbolic constant.

Finally, I removed the useless switch to D0 from resume since
the core does it for us.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/drivers/video/aty/atyfb_base.c b/drivers/video/aty/atyfb_base.c
index 1d6e16d..1207c20 100644 (file)
--- a/drivers/video/aty/atyfb_base.c
+++ b/drivers/video/aty/atyfb_base.c
@@ -1978,7 +1978,7 @@ static int aty_power_mgmt(int sleep, struct atyfb_par *par)
 
        return timeout ? 0 : -EIO;
 }
-#endif
+#endif /* CONFIG_PPC_PMAC */
 
 static int atyfb_pci_suspend(struct pci_dev *pdev, pm_message_t state)
 {
@@ -2002,9 +2002,15 @@ static int atyfb_pci_suspend(struct pci_dev *pdev, pm_message_t state)
        par->asleep = 1;
        par->lock_blank = 1;
 
+       /* Because we may change PCI D state ourselves, we need to
+        * first save the config space content so the core can
+        * restore it properly on resume.
+        */
+       pci_save_state(pdev);
+
 #ifdef CONFIG_PPC_PMAC
        /* Set chip to "suspend" mode */
-       if (aty_power_mgmt(1, par)) {
+       if (machine_is(powermac) && aty_power_mgmt(1, par)) {
                par->asleep = 0;
                par->lock_blank = 0;
                atyfb_blank(FB_BLANK_UNBLANK, info);
@@ -2047,11 +2053,15 @@ static int atyfb_pci_resume(struct pci_dev *pdev)
 
        acquire_console_sem();
 
+       /* PCI state will have been restored by the core, so
+        * we should be in D0 now with our config space fully
+        * restored
+        */
+
 #ifdef CONFIG_PPC_PMAC
-       if (pdev->dev.power.power_state.event == 2)
+       if (machine_is(powermac) &&
+           pdev->dev.power.power_state.event == PM_EVENT_SUSPEND)
                aty_power_mgmt(0, par);
-#else
-       pci_set_power_state(pdev, PCI_D0);
 #endif
 
        aty_resume_chip(info);