gpu: nvgpu: Add return code to fb.tlb_invalidate

  As part of MISRA 17.7 fixes for a different GPU, the tlb_invalidate
  needs to return an error code.

Change-Id: I3b8b9f112708c17457855dd1fb151168791bc6bf
Signed-off-by: Nicolas Benech <nbenech@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1810106
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

2 files changed, 6 insertions, 3 deletions

diff --git a/drivers/gpu/nvgpu/common/fb/fb_gm20b.c b/drivers/gpu/nvgpu/common/fb/fb_gm20b.c
index b4756546..65b7336c 100644
--- a/drivers/gpu/nvgpu/common/fb/fb_gm20b.c
+++ b/drivers/gpu/nvgpu/common/fb/fb_gm20b.c
@@ -60,11 +60,12 @@ void gm20b_fb_init_hw(struct gk20a *g)
         gk20a_writel(g, fb_niso_flush_sysmem_addr_r(), addr);
 }
 
-void gm20b_fb_tlb_invalidate(struct gk20a *g, struct nvgpu_mem *pdb)
+int gm20b_fb_tlb_invalidate(struct gk20a *g, struct nvgpu_mem *pdb)
 {
         struct nvgpu_timeout timeout;
         u32 addr_lo;
         u32 data;
+        int err = 0;
 
         nvgpu_log_fn(g, " ");
 
@@ -75,7 +76,7 @@ void gm20b_fb_tlb_invalidate(struct gk20a *g, struct nvgpu_mem *pdb)
            power is turned off */
 
         if (!g->power_on) {
-                return;
+                return err;
         }
 
         addr_lo = u64_lo32(nvgpu_mem_get_addr(g, pdb) >> 12);
@@ -96,6 +97,7 @@ void gm20b_fb_tlb_invalidate(struct gk20a *g, struct nvgpu_mem *pdb)
                                          "wait mmu fifo space"));
 
         if (nvgpu_timeout_peek_expired(&timeout)) {
+                err = -ETIMEDOUT;
                 goto out;
         }
 
@@ -126,6 +128,7 @@ void gm20b_fb_tlb_invalidate(struct gk20a *g, struct nvgpu_mem *pdb)
 
 out:
         nvgpu_mutex_release(&g->mm.tlb_lock);
+        return err;
 }
 
 void fb_gm20b_init_fs_state(struct gk20a *g)
diff --git a/drivers/gpu/nvgpu/common/fb/fb_gm20b.h b/drivers/gpu/nvgpu/common/fb/fb_gm20b.h
index 95991432..bc240ae3 100644
--- a/drivers/gpu/nvgpu/common/fb/fb_gm20b.h
+++ b/drivers/gpu/nvgpu/common/fb/fb_gm20b.h
@@ -33,7 +33,7 @@ struct nvgpu_mem;
 
 void gm20b_fb_reset(struct gk20a *g);
 void gm20b_fb_init_hw(struct gk20a *g);
-void gm20b_fb_tlb_invalidate(struct gk20a *g, struct nvgpu_mem *pdb);
+int gm20b_fb_tlb_invalidate(struct gk20a *g, struct nvgpu_mem *pdb);
 void fb_gm20b_init_fs_state(struct gk20a *g);
 void gm20b_fb_set_mmu_page_size(struct gk20a *g);
 bool gm20b_fb_set_use_full_comp_tag_line(struct gk20a *g);