From 89b34254bb61d0ad5c701413572cf3d993c9bff8 Mon Sep 17 00:00:00 2001 From: Thierry Reding Date: Wed, 15 Jan 2020 15:06:13 +0100 Subject: [PATCH] drm/nouveau/pmu/gm20b,gp10b: Fix Falcon bootstrapping The low-level Falcon bootstrapping callbacks are expected to return 0 on success or a negative error code on failure. However, the implementation on Tegra returns the ID or mask of the Falcons that were bootstrapped on success, thus breaking the calling code, which treats this as failure. Fix this by making sure we only return 0 or a negative error code, just like the code for discrete GPUs does. Fixes: 86ce2a71539c ("drm/nouveau/flcn/cmdq: move command generation to subdevs") Signed-off-by: Thierry Reding Signed-off-by: Ben Skeggs --- drivers/gpu/drm/nouveau/nvkm/subdev/pmu/gm20b.c | 9 +++++++-- drivers/gpu/drm/nouveau/nvkm/subdev/pmu/gp10b.c | 9 +++++++-- 2 files changed, 14 insertions(+), 4 deletions(-) diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/pmu/gm20b.c b/drivers/gpu/drm/nouveau/nvkm/subdev/pmu/gm20b.c index 6d5a13e4a857..82571032a07d 100644 --- a/drivers/gpu/drm/nouveau/nvkm/subdev/pmu/gm20b.c +++ b/drivers/gpu/drm/nouveau/nvkm/subdev/pmu/gm20b.c @@ -52,8 +52,13 @@ gm20b_pmu_acr_bootstrap_falcon(struct nvkm_falcon *falcon, ret = nvkm_falcon_cmdq_send(pmu->hpq, &cmd.cmd.hdr, gm20b_pmu_acr_bootstrap_falcon_cb, &pmu->subdev, msecs_to_jiffies(1000)); - if (ret >= 0 && ret != cmd.falcon_id) - ret = -EIO; + if (ret >= 0) { + if (ret != cmd.falcon_id) + ret = -EIO; + else + ret = 0; + } + return ret; } diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/pmu/gp10b.c b/drivers/gpu/drm/nouveau/nvkm/subdev/pmu/gp10b.c index 39c86bc56310..5b81c7320479 100644 --- a/drivers/gpu/drm/nouveau/nvkm/subdev/pmu/gp10b.c +++ b/drivers/gpu/drm/nouveau/nvkm/subdev/pmu/gp10b.c @@ -52,8 +52,13 @@ gp10b_pmu_acr_bootstrap_multiple_falcons(struct nvkm_falcon *falcon, u32 mask) ret = nvkm_falcon_cmdq_send(pmu->hpq, &cmd.cmd.hdr, gp10b_pmu_acr_bootstrap_multiple_falcons_cb, &pmu->subdev, msecs_to_jiffies(1000)); - if (ret >= 0 && ret != cmd.falcon_mask) - ret = -EIO; + if (ret >= 0) { + if (ret != cmd.falcon_mask) + ret = -EIO; + else + ret = 0; + } + return ret; } -- 2.45.2