From 2684741ec578fae605c877d6f1447b324df407dc Mon Sep 17 00:00:00 2001
From: Owain Ainsworth <oga@cvs.openbsd.org>
Date: Wed, 7 Apr 2010 20:40:19 +0000
Subject: Make intagp restore pgtbl_ctl and the scratch page to the gtt on
 resume.

When we move more towards kms we'll need to save/restore what is bound
to the aperture, but right now this is not needed (since we always
unbind everything before we go down anyway).

"can not hurt" deraadt@. tested by halex, deraadt and maybe some others.
---
 sys/dev/pci/agp_i810.c | 67 ++++++++++++++++++++++++++++++++++----------------
 1 file changed, 46 insertions(+), 21 deletions(-)

(limited to 'sys')

diff --git a/sys/dev/pci/agp_i810.c b/sys/dev/pci/agp_i810.c
index 1d52e60ecc3..80a06307dae 100644
--- a/sys/dev/pci/agp_i810.c
+++ b/sys/dev/pci/agp_i810.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: agp_i810.c,v 1.59 2010/03/03 10:19:34 oga Exp $	*/
+/*	$OpenBSD: agp_i810.c,v 1.60 2010/04/07 20:40:18 oga Exp $	*/
 
 /*-
  * Copyright (c) 2000 Doug Rabson
@@ -89,6 +89,8 @@ struct agp_i810_softc {
 };
 
 void	agp_i810_attach(struct device *, struct device *, void *);
+int	agp_i810_activate(struct device *arg, int act);
+void	agp_i810_configure(struct agp_i810_softc *);
 int	agp_i810_probe(struct device *, void *, void *);
 int	agp_i810_get_chiptype(struct pci_attach_args *);
 void	agp_i810_bind_page(void *, bus_size_t, paddr_t, int);
@@ -106,7 +108,8 @@ extern void	intagp_dma_sync(bus_dma_tag_t, bus_dmamap_t,
 		    bus_addr_t, bus_size_t, int);
 
 struct cfattach intagp_ca = {
-	sizeof(struct agp_i810_softc), agp_i810_probe, agp_i810_attach
+	sizeof(struct agp_i810_softc), agp_i810_probe, agp_i810_attach,
+	NULL, agp_i810_activate,
 };
 
 struct cfdriver intagp_cd = {
@@ -464,16 +467,48 @@ agp_i810_attach(struct device *parent, struct device *self, void *aux)
 		printf(": unknown initialisation\n");
 		return;
 	}
-	agp_flush_cache();
-	/* Install the GATT. */
-	WRITE4(AGP_I810_PGTBL_CTL, gatt->ag_physical | 1);
-
 	/* Intel recommends that you have a fake page bound to the gtt always */
 	if (agp_alloc_dmamem(pa->pa_dmat, AGP_PAGE_SIZE, &isc->scrib_dmamap,
 	    &tmp, &isc->scrib_seg) != 0) {
 		printf(": can't get scribble page\n");
 		return;
 	}
+	agp_i810_configure(isc);
+
+	isc->agpdev = (struct agp_softc *)agp_attach_bus(pa, &agp_i810_methods,
+	    isc->isc_apaddr, isc->isc_apsize, &isc->dev);
+	return;
+out:
+
+	if (isc->gatt)
+		if (isc->gatt->ag_size != 0)
+			agp_free_dmamem(pa->pa_dmat, gatt->ag_size,
+			    gatt->ag_dmamap, &gatt->ag_dmaseg);
+		free(isc->gatt, M_AGP);
+	if (isc->gtt_map != NULL)
+		vga_pci_bar_unmap(isc->gtt_map);
+	if (isc->map != NULL)
+		vga_pci_bar_unmap(isc->map);
+}
+
+int
+agp_i810_activate(struct device *arg, int act)
+{
+	struct agp_i810_softc *isc = (struct agp_i810_softc *)arg;
+
+	switch(act) {
+	case DVACT_RESUME:
+		agp_i810_configure(isc);
+		break;
+	}
+
+	return (0);
+}
+void
+agp_i810_configure(struct agp_i810_softc *isc)
+{
+	bus_addr_t	tmp;
+
 	tmp = isc->isc_apaddr;
 	if (isc->chiptype == CHIP_I810) {
 		tmp += isc->dcache_size;
@@ -481,30 +516,20 @@ agp_i810_attach(struct device *parent, struct device *self, void *aux)
 		tmp += isc->stolen << AGP_PAGE_SHIFT;
 	}
 
+	agp_flush_cache();
+	/* Install the GATT. */
+	WRITE4(AGP_I810_PGTBL_CTL, isc->gatt->ag_physical | 1);
+
 	/* initialise all gtt entries to point to scribble page */
 	for (; tmp < (isc->isc_apaddr + isc->isc_apsize);
 	    tmp += AGP_PAGE_SIZE)
 		agp_i810_unbind_page(isc, tmp);
+	/* XXX we'll need to restore the GTT contents when we go kms */
 
 	/*
 	 * Make sure the chipset can see everything.
 	 */
 	agp_flush_cache();
-
-	isc->agpdev = (struct agp_softc *)agp_attach_bus(pa, &agp_i810_methods,
-	    isc->isc_apaddr, isc->isc_apsize, &isc->dev);
-	return;
-out:
-
-	if (isc->gatt)
-		if (isc->gatt->ag_size != 0)
-			agp_free_dmamem(pa->pa_dmat, gatt->ag_size,
-			    gatt->ag_dmamap, &gatt->ag_dmaseg);
-		free(isc->gatt, M_AGP);
-	if (isc->gtt_map != NULL)
-		vga_pci_bar_unmap(isc->gtt_map);
-	if (isc->map != NULL)
-		vga_pci_bar_unmap(isc->map);
 }
 
 #if 0
-- 
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