drm/nv50/disp: completely reset disp if master evo channel active at init

	return 4;

}

static int

evo_icmd(struct drm_device *dev, int ch, u32 mthd, u32 data)

{

	int ret = 0;

	if (nouveau_reg_debug & NOUVEAU_REG_DEBUG_EVO)

		NV_INFO(dev, "EvoPIO: %d 0x%04x 0x%08x\n", ch, mthd, data);

	nv_mask(dev, 0x610300 + (ch * 0x08), 0x00000001, 0x00000001);

	nv_wr32(dev, 0x610304 + (ch * 0x08), data);

	nv_wr32(dev, 0x610300 + (ch * 0x08), 0x80000001 | mthd);

	if (!nv_wait(dev, 0x610300 + (ch * 0x08), 0x80000000, 0x00000000))

		ret = -EBUSY;

	nv_mask(dev, 0x610300 + (ch * 0x08), 0x00000001, 0x00000000);

	return ret;

}

int

nv50_display_early_init(struct drm_device *dev)

{

	int i;

	/* check if master evo channel is already active, a good a sign as any

	 * that the display engine is in a weird state (hibernate/kexec), if

	 * it is, do our best to reset the display engine...

	 */

	if (nv_rd32(dev, 0x610200) & 0x00000001) {

		NV_INFO(dev, "PDISP: already active, attempting to reset...\n");

		/* deactivate both heads first, PDISP will disappear forever

		 * (well, until you power cycle) on some boards as soon as

		 * PMC_ENABLE is hit unless they are..

		 */

		for (i = 0; i < 2; i++) {

			evo_icmd(dev, 0, 0x0880 + (i * 0x400), 0x05000000);

			evo_icmd(dev, 0, 0x089c + (i * 0x400), 0);

			evo_icmd(dev, 0, 0x0840 + (i * 0x400), 0);

			evo_icmd(dev, 0, 0x0844 + (i * 0x400), 0);

			evo_icmd(dev, 0, 0x085c + (i * 0x400), 0);

			evo_icmd(dev, 0, 0x0874 + (i * 0x400), 0);

		}

		evo_icmd(dev, 0, 0x0080, 0);

		/* reset PDISP */

		nv_mask(dev, 0x000200, 0x40000000, 0x00000000);

		nv_mask(dev, 0x000200, 0x40000000, 0x40000000);

	}

	return 0;

}