drm/nouveau/ltc/gm107: wait on relevant bit in gm107_ltc_cbc_wait

Patch "ltc/gm107: use nvkm_mask to set cbc_ctrl1" sets the 3rd bit
of the CTRL1 register instead of writing it entirely in
gm107_ltc_cbc_clear(). As a counterpart, gm107_ltc_cbc_wait() must also
be modified to wait on that single bit only, otherwise a timeout may
occur if some other bit of that register is set. This happened at least
on GM206 when running glmark2-drm.

While we are at it, use the more compact nvkm_wait_msec() to wait for
the bit to clear.

Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/ltc/gm107.c b/drivers/gpu/drm/nouveau/nvkm/subdev/ltc/gm107.c
index 2af1f9e..47c4e71 100644 (file)
--- a/drivers/gpu/drm/nouveau/nvkm/subdev/ltc/gm107.c
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/ltc/gm107.c
@@ -43,10 +43,8 @@ gm107_ltc_cbc_wait(struct nvkm_ltc *ltc)
        for (c = 0; c < ltc->ltc_nr; c++) {
                for (s = 0; s < ltc->lts_nr; s++) {
                        const u32 addr = 0x14046c + (c * 0x2000) + (s * 0x200);
-                       nvkm_msec(device, 2000,
-                               if (!nvkm_rd32(device, addr))
-                                       break;
-                       );
+                       nvkm_wait_msec(device, 2000, addr,
+                                      0x00000004, 0x00000000);
                }
        }
 }