drm/amd/display: Add NULL test for 'timing generator' in 'dcn21_set_pipe()'

From Srinivasan Shanmugam
3f3c237a706580326d3b7a1b97697e5031ca4667 in linux-6.6.y/6.6.17
66951d98d9bf45ba25acf37fe0747253fafdf298 in mainline linux

diff --git a/sys/dev/pci/drm/amd/display/dc/dcn21/dcn21_hwseq.c b/sys/dev/pci/drm/amd/display/dc/dcn21/dcn21_hwseq.c
index 7238930..1b08749 100644 (file)
--- a/sys/dev/pci/drm/amd/display/dc/dcn21/dcn21_hwseq.c
+++ b/sys/dev/pci/drm/amd/display/dc/dcn21/dcn21_hwseq.c
@@ -206,28 +206,32 @@ void dcn21_set_abm_immediate_disable(struct pipe_ctx *pipe_ctx)
 void dcn21_set_pipe(struct pipe_ctx *pipe_ctx)
 {
        struct abm *abm = pipe_ctx->stream_res.abm;
-       uint32_t otg_inst = pipe_ctx->stream_res.tg->inst;
+       struct timing_generator *tg = pipe_ctx->stream_res.tg;
        struct panel_cntl *panel_cntl = pipe_ctx->stream->link->panel_cntl;
        struct dmcu *dmcu = pipe_ctx->stream->ctx->dc->res_pool->dmcu;
+       uint32_t otg_inst;
+
+       if (!abm && !tg && !panel_cntl)
+               return;
+
+       otg_inst = tg->inst;
 
        if (dmcu) {
                dce110_set_pipe(pipe_ctx);
                return;
        }
 
-       if (abm && panel_cntl) {
-               if (abm->funcs && abm->funcs->set_pipe_ex) {
-                       abm->funcs->set_pipe_ex(abm,
+       if (abm->funcs && abm->funcs->set_pipe_ex) {
+               abm->funcs->set_pipe_ex(abm,
                                        otg_inst,
                                        SET_ABM_PIPE_NORMAL,
                                        panel_cntl->inst,
                                        panel_cntl->pwrseq_inst);
-               } else {
-                               dmub_abm_set_pipe(abm, otg_inst,
-                                               SET_ABM_PIPE_NORMAL,
-                                               panel_cntl->inst,
-                                               panel_cntl->pwrseq_inst);
-               }
+       } else {
+               dmub_abm_set_pipe(abm, otg_inst,
+                                 SET_ABM_PIPE_NORMAL,
+                                 panel_cntl->inst,
+                                 panel_cntl->pwrseq_inst);
        }
 }