gpu: nvgpu: fix 4k compression

Add CPU dcache flush after populating scatterBuffer so that the GPU
will see the buffer contents.

Bug 1679453

Change-Id: I564394ed1fcff4d08d753e753bd3243b460d76df
Signed-off-by: Jussi Rasanen <jrasanen@nvidia.com>
Reviewed-on: http://git-master/r/805197
(cherry picked from commit d6a5513745aa77c84ac5408a62f72f24839ef439)
Reviewed-on: http://git-master/r/808246
Reviewed-by: Automatic_Commit_Validation_User
GVS: Gerrit_Virtual_Submit
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
Tested-by: Terje Bergstrom <tbergstrom@nvidia.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/cde_gk20a.c b/drivers/gpu/nvgpu/gk20a/cde_gk20a.c
index cd4e71bf..6d8633a7 100644
--- a/drivers/gpu/nvgpu/gk20a/cde_gk20a.c
+++ b/drivers/gpu/nvgpu/gk20a/cde_gk20a.c
@@ -1035,6 +1035,7 @@ __releases(&cde_app->mutex)
                                 goto exit_unlock;
                 }
 
+                __cpuc_flush_dcache_area(scatter_buffer, scatterbuffer_size);
                 dma_buf_vunmap(compbits_scatter_buf, surface);
                 surface = NULL;
         }