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From: Jonathan Corbet on 8 Apr 2010 13:20
From: Deepak Saxena <dsaxena(a)laptop.org>

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(a)laptop.org>
---
drivers/video/via/viafbdev.c | 51 ++++++++++++++++++++++++++++++++++++++++++
drivers/video/via/viafbdev.h | 3 ++
2 files changed, 54 insertions(+), 0 deletions(-)

diff --git a/drivers/video/via/viafbdev.c b/drivers/video/via/viafbdev.c
index ea3018e..88298e1 100644
--- a/drivers/video/via/viafbdev.c
+++ b/drivers/video/via/viafbdev.c
@@ -1843,6 +1843,53 @@ out_default:
*yres = 480;
}

+
+#ifdef CONFIG_PM
+static 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->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;
+}
+
+static 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->engine_mmio + 0x100,
+ viaparinfo->shared->saved_regs,
+ 0x100 * sizeof(u32));
+
+ fb_set_suspend(viafbinfo, 0);
+
+fail:
+ release_console_sem();
+ return 0;
+}
+
+#endif
+
+
static int __devinit via_pci_probe(struct pci_dev *pdev,
const struct pci_device_id *ent)
{
@@ -2219,6 +2266,10 @@ static struct pci_driver viafb_driver = {
.id_table = viafb_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 viafb_init(void)
diff --git a/drivers/video/via/viafbdev.h b/drivers/video/via/viafbdev.h
index 1dab97b..46d41af 100644
--- a/drivers/video/via/viafbdev.h
+++ b/drivers/video/via/viafbdev.h
@@ -60,6 +60,9 @@ struct viafb_shared {
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 {
--
1.7.0.1

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Prev: [PATCH 10/16] suppress verbose debug messages: change printk() to DEBUG_MSG()
Next: [PATCH 08/16] viafb: Do not probe for LVDS/TMDS on OLPC XO-1.5