Commit 3fd9b6cc authored by Deepak Saxena's avatar Deepak Saxena Committed by Florian Tobias Schandinat
Browse files

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: default avatarDeepak Saxena <dsaxena@laptop.org>
[fts: viafb_driver moved from viafbdev.c to via-core.c]
Signed-off-by: default avatarFlorian Tobias Schandinat <FlorianSchandinat@gmx.de>
Acked-by: default avatarJonathan Corbet <corbet@lwn.net>
Cc: Joseph Chan <JosephChan@via.com.tw>
parent efd4f639

drivers/video/via/via-core.c

+4 −0
Original line number Diff line number Diff line
@@ -644,6 +644,10 @@ static struct pci_driver via_driver = { 
	.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)

drivers/video/via/viafbdev.c

+46 −0
Original line number Diff line number Diff line
@@ -1669,6 +1669,52 @@ static int parse_mode(const char *str, u32 *xres, u32 *yres) 
}





#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;

drivers/video/via/viafbdev.h

+5 −0
Original line number Diff line number Diff line
@@ -62,6 +62,9 @@ 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 {
@@ -108,4 +111,6 @@ void via_fb_pci_remove(struct pci_dev *pdev); 
/* 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__ */

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