[PATCH 1/2] nouveau: handle EBUSY and EAGAIN for GSP aux errors.

[Dave Airlie]

From: Dave Airlie <airl...@redhat.com>

The upper layer transfer functions expect EBUSY as a return
for when retries should be done.

Fix the AUX error translation, but also check for both errors
in a few places.

Fixes: eb284f4b3781 ("drm/nouveau/dp: Honor GSP link training retry timeouts")
Signed-off-by: Dave Airlie <airl...@redhat.com>
---
 drivers/gpu/drm/nouveau/nvkm/engine/disp/r535.c | 2 +-
 drivers/gpu/drm/nouveau/nvkm/subdev/gsp/r535.c  | 6 +++---
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/disp/r535.c 
b/drivers/gpu/drm/nouveau/nvkm/engine/disp/r535.c
index 027867c2a8c5..8f9aa3463c3c 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/disp/r535.c
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/disp/r535.c
@@ -992,7 +992,7 @@ r535_dp_train_target(struct nvkm_outp *outp, u8 target, 
bool mst, u8 link_nr, u8
                ctrl->data = data;
 
                ret = nvkm_gsp_rm_ctrl_push(&disp->rm.objcom, &ctrl, 
sizeof(*ctrl));
-               if (ret == -EAGAIN && ctrl->retryTimeMs) {
+               if ((ret == -EAGAIN || ret == -EBUSY) && ctrl->retryTimeMs) {
                        /*
                         * Device (likely an eDP panel) isn't ready yet, wait 
for the time specified
                         * by GSP before retrying again
diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/gsp/r535.c 
b/drivers/gpu/drm/nouveau/nvkm/subdev/gsp/r535.c
index cf58f9da9139..d586aea30898 100644
--- a/drivers/gpu/drm/nouveau/nvkm/subdev/gsp/r535.c
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/gsp/r535.c
@@ -78,7 +78,7 @@ r535_rpc_status_to_errno(uint32_t rpc_status)
        switch (rpc_status) {
        case 0x55: /* NV_ERR_NOT_READY */
        case 0x66: /* NV_ERR_TIMEOUT_RETRY */
-               return -EAGAIN;
+               return -EBUSY;
        case 0x51: /* NV_ERR_NO_MEMORY */
                return -ENOMEM;
        default:
@@ -601,7 +601,7 @@ r535_gsp_rpc_rm_alloc_push(struct nvkm_gsp_object *object, 
void *argv, u32 repc)
 
        if (rpc->status) {
                ret = ERR_PTR(r535_rpc_status_to_errno(rpc->status));
-               if (PTR_ERR(ret) != -EAGAIN)
+               if (PTR_ERR(ret) != -EAGAIN && PTR_ERR(ret) != -EBUSY)
                        nvkm_error(&gsp->subdev, "RM_ALLOC: 0x%x\n", 
rpc->status);
        } else {
                ret = repc ? rpc->params : NULL;
@@ -660,7 +660,7 @@ r535_gsp_rpc_rm_ctrl_push(struct nvkm_gsp_object *object, 
void **argv, u32 repc)
 
        if (rpc->status) {
                ret = r535_rpc_status_to_errno(rpc->status);
-               if (ret != -EAGAIN)
+               if (ret != -EAGAIN && ret != -EBUSY)
                        nvkm_error(&gsp->subdev, "cli:0x%08x obj:0x%08x ctrl 
cmd:0x%08x failed: 0x%08x\n",
                                   object->client->object.handle, 
object->handle, rpc->cmd, rpc->status);
        }
-- 
2.47.0