From: Aurabindo Pillai aurabindo.pillai@amd.com

[WHY & HOW] Check whether get_subvp_en() callback exists before calling it.

Cc: Mario Limonciello mario.limonciello@amd.com Cc: Alex Deucher alexander.deucher@amd.com Cc: stable@vger.kernel.org Reviewed-by: Alex Hung alex.hung@amd.com Acked-by: Alex Hung alex.hung@amd.com Signed-off-by: Aurabindo Pillai aurabindo.pillai@amd.com --- drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c index 13a177d34376..45c972f2630d 100644 --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c @@ -3647,12 +3647,16 @@ static int capabilities_show(struct seq_file *m, void *unused) bool mall_supported = dc->caps.mall_size_total; bool subvp_supported = dc->caps.subvp_fw_processing_delay_us; unsigned int mall_in_use = false; - unsigned int subvp_in_use = dc->cap_funcs.get_subvp_en(dc, dc->current_state); + unsigned int subvp_in_use = false; + struct hubbub *hubbub = dc->res_pool->hubbub;

if (hubbub->funcs->get_mall_en) hubbub->funcs->get_mall_en(hubbub, &mall_in_use);

+ if (dc->cap_funcs.get_subvp_en) + subvp_in_use = dc->cap_funcs.get_subvp_en(dc, dc->current_state); + seq_printf(m, "mall supported: %s, enabled: %s\n", mall_supported ? "yes" : "no", mall_in_use ? "yes" : "no"); seq_printf(m, "sub-viewport supported: %s, enabled: %s\n",