drm/nouveau/agp: add a quirk list to limit agp modes

Certain combinations of hardware can't actually support the maximum
detected speed. Add a quirk list that lists pairs of hostbridge/chip pci
ids and the mode that they should work with.

See https://bugs.freedesktop.org/show_bug.cgi?id=20341

Reported-by: Jason Detring <detringj@gmail.com>
Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

diff --git a/drivers/gpu/drm/nouveau/nouveau_agp.c b/drivers/gpu/drm/nouveau/nouveau_agp.c
index 6e7a55f..2953c4e 100644 (file)
--- a/drivers/gpu/drm/nouveau/nouveau_agp.c
+++ b/drivers/gpu/drm/nouveau/nouveau_agp.c
@@ -11,10 +11,28 @@ MODULE_PARM_DESC(agpmode, "AGP mode (0 to disable AGP)");
 static int nouveau_agpmode = -1;
 module_param_named(agpmode, nouveau_agpmode, int, 0400);
 
+struct nouveau_agpmode_quirk {
+       u16 hostbridge_vendor;
+       u16 hostbridge_device;
+       u16 chip_vendor;
+       u16 chip_device;
+       int mode;
+};
+
+static struct nouveau_agpmode_quirk nouveau_agpmode_quirk_list[] = {
+       /* VIA Apollo PRO133x / GeForce FX 5600 Ultra, max agpmode 2, fdo #20341 */
+       { PCI_VENDOR_ID_VIA, 0x0691, PCI_VENDOR_ID_NVIDIA, 0x0311, 2 },
+
+       {},
+};
+
 static unsigned long
-get_agp_mode(struct nouveau_drm *drm, unsigned long mode)
+get_agp_mode(struct nouveau_drm *drm, const struct drm_agp_info *info)
 {
        struct nouveau_device *device = nv_device(drm->device);
+       struct nouveau_agpmode_quirk *quirk = nouveau_agpmode_quirk_list;
+       int agpmode = nouveau_agpmode;
+       unsigned long mode = info->mode;
 
        /*
         * FW seems to be broken on nv18, it makes the card lock up
@@ -23,12 +41,28 @@ get_agp_mode(struct nouveau_drm *drm, unsigned long mode)
        if (device->chipset == 0x18)
                mode &= ~PCI_AGP_COMMAND_FW;
 
+       /*
+        * Go through the quirks list and adjust the agpmode accordingly.
+        */
+       while (agpmode == -1 && quirk->hostbridge_vendor) {
+               if (info->id_vendor == quirk->hostbridge_vendor &&
+                   info->id_device == quirk->hostbridge_device &&
+                   device->pdev->vendor == quirk->chip_vendor &&
+                   device->pdev->device == quirk->chip_device) {
+                       agpmode = quirk->mode;
+                       nv_info(device, "Forcing agp mode to %dX. Use agpmode to override.\n",
+                               agpmode);
+                       break;
+               }
+               ++quirk;
+       }
+
        /*
         * AGP mode set in the command line.
         */
-       if (nouveau_agpmode > 0) {
+       if (agpmode > 0) {
                bool agpv3 = mode & 0x8;
-               int rate = agpv3 ? nouveau_agpmode / 4 : nouveau_agpmode;
+               int rate = agpv3 ? agpmode / 4 : agpmode;
 
                mode = (mode & ~0x7) | (rate & 0x7);
        }
@@ -90,7 +124,7 @@ nouveau_agp_reset(struct nouveau_drm *drm)
                if (ret)
                        return;
 
-               mode.mode  = get_agp_mode(drm, info.mode);
+               mode.mode  = get_agp_mode(drm, &info);
                mode.mode &= ~PCI_AGP_COMMAND_FW;
 
                ret = drm_agp_enable(dev, mode);
@@ -139,7 +173,7 @@ nouveau_agp_init(struct nouveau_drm *drm)
        }
 
        /* see agp.h for the AGPSTAT_* modes available */
-       mode.mode = get_agp_mode(drm, info.mode);
+       mode.mode = get_agp_mode(drm, &info);
 
        ret = drm_agp_enable(dev, mode);
        if (ret) {