gpu: nvgpu: gv11b: clear channel status

After unbinding channel, following fields in
channel status needs to be cleared manually:
ccsr_channel_enable_clr_true
ccsr_channel_pbdma_faulted_reset
ccsr_channel_eng_faulted_reset

Unbinding channel expected to clear all other
channel status fields.

Bug 1972365

Change-Id: Ibfd84df2f41adc2eb437a026acde3f3d618d7758
Signed-off-by: seshendra Gadagottu <sgadagottu@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1594671
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

1 files changed, 12 insertions, 1 deletions

diff --git a/drivers/gpu/nvgpu/gv11b/fifo_gv11b.c b/drivers/gpu/nvgpu/gv11b/fifo_gv11b.c
index 4c3b1186..a3cb9292 100644
--- a/drivers/gpu/nvgpu/gv11b/fifo_gv11b.c
+++ b/drivers/gpu/nvgpu/gv11b/fifo_gv11b.c
@@ -260,9 +260,20 @@ void gv11b_userd_gp_put(struct gk20a *g, struct channel_gk20a *c)
 
 void channel_gv11b_unbind(struct channel_gk20a *ch)
 {
+        struct gk20a *g = ch->g;
+
         gk20a_dbg_fn("");
 
-        gk20a_fifo_channel_unbind(ch);
+        if (nvgpu_atomic_cmpxchg(&ch->bound, true, false)) {
+                gk20a_writel(g, ccsr_channel_inst_r(ch->chid),
+                        ccsr_channel_inst_ptr_f(0) |
+                        ccsr_channel_inst_bind_false_f());
+
+                gk20a_writel(g, ccsr_channel_r(ch->chid),
+                        ccsr_channel_enable_clr_true_f() |
+                        ccsr_channel_pbdma_faulted_reset_f() |
+                        ccsr_channel_eng_faulted_reset_f());
+        }
 }
 
 u32 gv11b_fifo_get_num_fifos(struct gk20a *g)