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authorDavid Mosberger <davidm@napali.hpl.hp.com>2005-04-04 13:29:43 -0700
committerDave Jones <davej@redhat.com>2005-06-07 12:35:44 -0700
commit66bb8bf8b235ba4d37fda14375827864977c6a3e (patch)
tree830da5361c73af24b309f6ecc6b87482eb4f1c32 /drivers/char
parent07eee78ea8ba2d0b7b20551c35a3e7dd158d50bb (diff)
[PATCH] Replace check_bridge_mode() with (bridge->mode & AGSTAT_MODE_3_0).
[AGPGART] Replace check_bridge_mode() with (bridge->mode & AGSTAT_MODE_3_0). As mentioned earlier, the current check_bridge_mode() code assumes that AGP bridges are PCI devices. This isn't always true. Definitely not for HP zx1 chipset and the same seems to be the case for SGI's AGP bridge. The patch below fixes the problem by picking up the AGP_MODE_3_0 bit from bridge->mode. I feel like I may be missing something, since I can't see any reason why check_bridge_mode() wasn't doing that in the first place. According to the AGP 3.0 specs, the AGP_MODE_3_0 bit is determined during the hardware reset and cannot be changed, so it seems to me it should be safe to pick it up from bridge->mode. With the patch applied, I can definitely use AGP acceleration both with AGP 2.0 and AGP 3.0 (one with an Nvidia card, the other with an ATI FireGL card). Unless someone spots a problem, please apply this patch so 3d acceleration can work on zx1 boxes again. This makes AGP work again on machines with an AGP bridge that isn't a PCI device. Signed-off-by: David Mosberger-Tang <davidm@hpl.hp.com> Signed-off-by: Dave Jones <davej@redhat.com>
Diffstat (limited to 'drivers/char')
-rw-r--r--drivers/char/agp/generic.c19
1 files changed, 3 insertions, 16 deletions
diff --git a/drivers/char/agp/generic.c b/drivers/char/agp/generic.c
index d62505b5d25..f0079e991bd 100644
--- a/drivers/char/agp/generic.c
+++ b/drivers/char/agp/generic.c
@@ -295,19 +295,6 @@ int agp_num_entries(void)
EXPORT_SYMBOL_GPL(agp_num_entries);
-static int check_bridge_mode(struct pci_dev *dev)
-{
- u32 agp3;
- u8 cap_ptr;
-
- cap_ptr = pci_find_capability(dev, PCI_CAP_ID_AGP);
- pci_read_config_dword(dev, cap_ptr+AGPSTAT, &agp3);
- if (agp3 & AGPSTAT_MODE_3_0)
- return 1;
- return 0;
-}
-
-
/**
* agp_copy_info - copy bridge state information
*
@@ -328,7 +315,7 @@ int agp_copy_info(struct agp_bridge_data *bridge, struct agp_kern_info *info)
info->version.minor = bridge->version->minor;
info->chipset = SUPPORTED;
info->device = bridge->dev;
- if (check_bridge_mode(bridge->dev))
+ if (bridge->mode & AGPSTAT_MODE_3_0)
info->mode = bridge->mode & ~AGP3_RESERVED_MASK;
else
info->mode = bridge->mode & ~AGP2_RESERVED_MASK;
@@ -661,7 +648,7 @@ u32 agp_collect_device_status(struct agp_bridge_data *bridge, u32 requested_mode
bridge_agpstat &= ~AGPSTAT_FW;
/* Check to see if we are operating in 3.0 mode */
- if (check_bridge_mode(agp_bridge->dev))
+ if (agp_bridge->mode & AGPSTAT_MODE_3_0)
agp_v3_parse_one(&requested_mode, &bridge_agpstat, &vga_agpstat);
else
agp_v2_parse_one(&requested_mode, &bridge_agpstat, &vga_agpstat);
@@ -732,7 +719,7 @@ void agp_generic_enable(struct agp_bridge_data *bridge, u32 requested_mode)
/* Do AGP version specific frobbing. */
if (bridge->major_version >= 3) {
- if (check_bridge_mode(bridge->dev)) {
+ if (bridge->mode & AGPSTAT_MODE_3_0) {
/* If we have 3.5, we can do the isoch stuff. */
if (bridge->minor_version >= 5)
agp_3_5_enable(bridge);