Turns out some VBIOSes don't actually set the bit in question in 2240c.
Use the nv50-style detection to try avoiding running the vbios twice.
Fixes: a6a0f67ca7aa ("drm/nouveau/devinit/gf100-: detect if BIOS invoked
devinit")
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=97620
Cc: <sta...@vger.kernel.org> # v4.6+
Signed-off-by: Ilia Mirkin <imir...@alum.mit.edu>
---
v1 -> v2: add vga.h include (had it sitting in my local tree but forgot to
amend the commit with it)
drivers/gpu/drm/nouveau/nvkm/subdev/devinit/gf100.c | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)
diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/devinit/gf100.c
b/drivers/gpu/drm/nouveau/nvkm/subdev/devinit/gf100.c
index 8b1b34c..686f788 100644
--- a/drivers/gpu/drm/nouveau/nvkm/subdev/devinit/gf100.c
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/devinit/gf100.c
@@ -27,6 +27,7 @@
#include <subdev/bios/init.h>
#include <subdev/bios/pll.h>
#include <subdev/clk/pll.h>
+#include <subdev/vga.h>
int
gf100_devinit_pll_set(struct nvkm_devinit *init, u32 type, u32 freq)
@@ -102,6 +103,25 @@ gf100_devinit_preinit(struct nvkm_devinit *base)
* can use it as a reliable way to know whether we should run devinit.
*/
base->post = ((nvkm_rd32(device, 0x2240c) & BIT(1)) == 0);
+
+ /*
+ * However some VBIOS init sequences miss this bit. So fall back to
+ * the nv50 method of checking if the bit is not set. Running the
+ * VBIOS multiple times may have detrimental effects.
+ */
+ if (base->post) {
+ u64 disable = nvkm_devinit_disable(base);
+ /* magic to detect whether or not x86 vbios code has
+ * executed the devinit scripts to initialise the
+ * board. only works if there's a display engine.
+ */
+ if (!(disable & (1ULL << NVKM_ENGINE_DISP))) {
+ if (nvkm_rdvgac(device, 0, 0x00) ||
+ nvkm_rdvgac(device, 0, 0x1a)) {
+ base->post = false;
+ }
+ }
+ }
}
static const struct nvkm_devinit_func
--
2.10.2
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