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aty128fb: Properly save PCI state before changing PCI PM level

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This fixes aty128fb 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 replaced the hand-coded switch to D2 with a call to the
genericc pci_set_power_state() and removed the code that switches it
back to D0 since the generic code is doing that for us nowadays.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Benjamin Herrenschmidt 2009-02-05 12:06:51 +11:00 committed by Linus Torvalds
parent b746816863
commit b746bb7762
1 changed files with 15 additions and 10 deletions
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25
drivers/video/aty/aty128fb.c
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@ -2374,6 +2374,8 @@ static void aty128_set_suspend(struct aty128fb_par *par, int suspend)
/* Set the chip into the appropriate suspend mode (we use D2,
* D3 would require a complete re-initialisation of the chip,
* including PCI config registers, clocks, AGP configuration, ...)
*
* For resume, the core will have already brought us back to D0
*/
if (suspend) {
/* Make sure CRTC2 is reset. Remove that the day we decide to
@ -2391,17 +2393,9 @@ static void aty128_set_suspend(struct aty128fb_par *par, int suspend)
aty_st_le32(BUS_CNTL1, 0x00000010);
aty_st_le32(MEM_POWER_MISC, 0x0c830000);
mdelay(100);
pci_read_config_word(pdev, par->pm_reg+PCI_PM_CTRL, &pwr_command);
/* Switch PCI power management to D2 */
pci_write_config_word(pdev, par->pm_reg+PCI_PM_CTRL,
(pwr_command & ~PCI_PM_CTRL_STATE_MASK) | 2);
pci_read_config_word(pdev, par->pm_reg+PCI_PM_CTRL, &pwr_command);
} else {
/* Switch back PCI power management to D0 */
mdelay(100);
pci_write_config_word(pdev, par->pm_reg+PCI_PM_CTRL, 0);
pci_read_config_word(pdev, par->pm_reg+PCI_PM_CTRL, &pwr_command);
mdelay(100);
pci_set_power_state(pdev, PCI_D2);
}
}
@ -2410,6 +2404,12 @@ static int aty128_pci_suspend(struct pci_dev *pdev, pm_message_t state)
struct fb_info *info = pci_get_drvdata(pdev);
struct aty128fb_par *par = info->par;
/* 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);
/* We don't do anything but D2, for now we return 0, but
* we may want to change that. How do we know if the BIOS
* can properly take care of D3 ? Also, with swsusp, we
@ -2476,6 +2476,11 @@ static int aty128_do_resume(struct pci_dev *pdev)
if (pdev->dev.power.power_state.event == PM_EVENT_ON)
return 0;
/* PCI state will have been restored by the core, so
* we should be in D0 now with our config space fully
* restored
*/
/* Wakeup chip */
aty128_set_suspend(par, 0);
par->asleep = 0;