diff options
| author | Andres Salomon <dilinger@queued.net> | 2008-04-28 02:15:27 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-04-28 08:58:39 -0700 |
| commit | f694e53bd0db69557ee8e0db2d1602818ff173b0 (patch) | |
| tree | d904b492105055a2adf00c60fa0324c0905b3bbe /drivers/video/geode/lxfb_core.c | |
| parent | aec40532c4d1183fa1ec415bb7dae08e19fc6b01 (diff) | |
lxfb: add power management functionality
This adds the ability to suspend/resume the lxfb driver, which includes:
- Register and palette saving code; registers are stored in lxfb_par.
A few MSR values are saved as well.
- lx_powerup and lx_powerdown functions which restore/save registers and
enable/disable graphic engines.
- lxfb_suspend/lxfb_resume
Originally based on a patch by Jordan Crouse.
[akpm@linux-foundation.org: be conventional, save an ifdef]
Signed-off-by: Andres Salomon <dilinger@debian.org>
Cc: "Antonino A. Daplas" <adaplas@pol.net>
Cc: Jordan Crouse <jordan.crouse@amd.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/video/geode/lxfb_core.c')
| -rw-r--r-- | drivers/video/geode/lxfb_core.c | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/drivers/video/geode/lxfb_core.c b/drivers/video/geode/lxfb_core.c index 19eabef1077a..b565882eee37 100644 --- a/drivers/video/geode/lxfb_core.c +++ b/drivers/video/geode/lxfb_core.c @@ -428,6 +428,45 @@ static struct fb_info * __init lxfb_init_fbinfo(struct device *dev) return info; } +#ifdef CONFIG_PM +static int lxfb_suspend(struct pci_dev *pdev, pm_message_t state) +{ + struct fb_info *info = pci_get_drvdata(pdev); + + if (state.event == PM_EVENT_SUSPEND) { + acquire_console_sem(); + lx_powerdown(info); + fb_set_suspend(info, 1); + release_console_sem(); + } + + /* there's no point in setting PCI states; we emulate PCI, so + * we don't end up getting power savings anyways */ + + return 0; +} + +static int lxfb_resume(struct pci_dev *pdev) +{ + struct fb_info *info = pci_get_drvdata(pdev); + int ret; + + acquire_console_sem(); + ret = lx_powerup(info); + if (ret) { + printk(KERN_ERR "lxfb: power up failed!\n"); + return ret; + } + + fb_set_suspend(info, 0); + release_console_sem(); + return 0; +} +#else +#define lxfb_suspend NULL +#define lxfb_resume NULL +#endif + static int __init lxfb_probe(struct pci_dev *pdev, const struct pci_device_id *id) { @@ -553,6 +592,8 @@ static struct pci_driver lxfb_driver = { .id_table = lxfb_id_table, .probe = lxfb_probe, .remove = lxfb_remove, + .suspend = lxfb_suspend, + .resume = lxfb_resume, }; #ifndef MODULE |