Minimal support for viafb suspend/resume
This patch adds minimal support for suspend/resume of the
VIA framebuffer device. It requires a version of OFW
that restores the video mode.
This patch is OLPC-specific as the proper upstream solution
is to move the VIA video path to using the kernel modesetting
infrastructure and doing a proper save/restore in the kernel.
[jc: extensive changes for 2.6.34 merge]
Signed-off-by: Deepak Saxena <dsaxena@laptop.org>
[fts: viafb_driver moved from viafbdev.c to via-core.c]
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
Acked-by: Jonathan Corbet <corbet@lwn.net>
Cc: Joseph Chan <JosephChan@via.com.tw>
diff --git a/drivers/video/via/via-core.c b/drivers/video/via/via-core.c
index 69101ab..9b487a6 100644
--- a/drivers/video/via/via-core.c
+++ b/drivers/video/via/via-core.c
@@ -644,6 +644,10 @@
.id_table = via_pci_table,
.probe = via_pci_probe,
.remove = __devexit_p(via_pci_remove),
+#ifdef CONFIG_PM
+ .suspend = viafb_suspend,
+ .resume = viafb_resume,
+#endif
};
static int __init via_core_init(void)
diff --git a/drivers/video/via/viafbdev.c b/drivers/video/via/viafbdev.c
index 7cc057d..596235b 100644
--- a/drivers/video/via/viafbdev.c
+++ b/drivers/video/via/viafbdev.c
@@ -1669,6 +1669,52 @@
}
+#ifdef CONFIG_PM
+int viafb_suspend(struct pci_dev *pdev, pm_message_t state)
+{
+ if (state.event == PM_EVENT_SUSPEND) {
+ acquire_console_sem();
+
+ memcpy_fromio(viaparinfo->shared->saved_regs,
+ viaparinfo->shared->vdev->engine_mmio + 0x100,
+ 0xff * sizeof(u32));
+
+ fb_set_suspend(viafbinfo, 1);
+
+ viafb_sync(viafbinfo);
+
+ pci_save_state(pdev);
+ pci_disable_device(pdev);
+ pci_set_power_state(pdev, pci_choose_state(pdev, state));
+ release_console_sem();
+ }
+
+ return 0;
+}
+
+int viafb_resume(struct pci_dev *pdev)
+{
+ acquire_console_sem();
+ pci_set_power_state(pdev, PCI_D0);
+ pci_restore_state(pdev);
+ if (pci_enable_device(pdev))
+ goto fail;
+ pci_set_master(pdev);
+
+ memcpy_toio(viaparinfo->shared->vdev->engine_mmio + 0x100,
+ viaparinfo->shared->saved_regs,
+ 0x100 * sizeof(u32));
+
+ fb_set_suspend(viafbinfo, 0);
+
+fail:
+ release_console_sem();
+ return 0;
+}
+
+#endif
+
+
int __devinit via_fb_pci_probe(struct viafb_dev *vdev)
{
u32 default_xres, default_yres;
diff --git a/drivers/video/via/viafbdev.h b/drivers/video/via/viafbdev.h
index d66f963..29a8c6c 100644
--- a/drivers/video/via/viafbdev.h
+++ b/drivers/video/via/viafbdev.h
@@ -62,6 +62,9 @@
u8 dst_bpp, u32 dst_addr, u32 dst_pitch, u32 dst_x, u32 dst_y,
u32 *src_mem, u32 src_addr, u32 src_pitch, u32 src_x, u32 src_y,
u32 fg_color, u32 bg_color, u8 fill_rop);
+
+ /* For suspend/resume */
+ u32 saved_regs[0x100];
};
struct viafb_par {
@@ -108,4 +111,6 @@
/* Temporary */
int viafb_init(void);
void viafb_exit(void);
+int viafb_suspend(struct pci_dev *pdev, pm_message_t state);
+int viafb_resume(struct pci_dev *pdev);
#endif /* __VIAFBDEV_H__ */