[PATCH 07/21] drm/amd/display: Check for dmcu initialization before calling dmcu

[Bhawanpreet Lakha]

From: David Francis <David.Francis at amd.com>

[Why]
DMCU firmware is not required - the system is expected to run
fine without it.  Therefore, wherever dmcu functions could be
called, dmcu initialization shoudl be checked

[How]
Use the helpful hook dmcu_funcs->is_dmcu_initialized

Change-Id: Idb5993ad3b7733e79717570f701a6f4868f04577
Signed-off-by: David Francis <David.Francis at amd.com>
Reviewed-by: Hersen Wu <hersenxs.wu at amd.com>
Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha at amd.com>
---
 drivers/gpu/drm/amd/display/dc/core/dc_link.c    |  2 +-
 drivers/gpu/drm/amd/display/dc/dce/dce_clk_mgr.c | 11 +++++++----
 2 files changed, 8 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link.c b/drivers/gpu/drm/amd/display/dc/core/dc_link.c
index 7ee9c033acbd..fe557e7142a1 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_link.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_link.c
@@ -2218,7 +2218,7 @@ bool dc_link_set_psr_enable(const struct dc_link *link, bool enable, bool wait)
 	struct dc  *core_dc = link->ctx->dc;
 	struct dmcu *dmcu = core_dc->res_pool->dmcu;
 
-	if (dmcu != NULL && link->psr_enabled)
+	if ((dmcu != NULL && dmcu->funcs->is_dmcu_initialized(dmcu)) && link->psr_enabled)
 		dmcu->funcs->set_psr_enable(dmcu, enable, wait);
 
 	return true;
diff --git a/drivers/gpu/drm/amd/display/dc/dce/dce_clk_mgr.c b/drivers/gpu/drm/amd/display/dc/dce/dce_clk_mgr.c
index 888d7129022e..56f598567f0b 100644
--- a/drivers/gpu/drm/amd/display/dc/dce/dce_clk_mgr.c
+++ b/drivers/gpu/drm/amd/display/dc/dce/dce_clk_mgr.c
@@ -277,7 +277,8 @@ static int dce_set_clock(
 	if (requested_clk_khz == 0)
 		clk_mgr_dce->cur_min_clks_state = DM_PP_CLOCKS_STATE_NOMINAL;
 
-	dmcu->funcs->set_psr_wait_loop(dmcu, actual_clock / 1000 / 7);
+	if (dmcu && dmcu->funcs->is_dmcu_initialized(dmcu))
+		dmcu->funcs->set_psr_wait_loop(dmcu, actual_clock / 1000 / 7);
 
 	return actual_clock;
 }
@@ -324,9 +325,11 @@ int dce112_set_clock(struct clk_mgr *clk_mgr, int requested_clk_khz)
 	bp->funcs->set_dce_clock(bp, &dce_clk_params);
 
 	if (!IS_FPGA_MAXIMUS_DC(core_dc->ctx->dce_environment)) {
-		if (clk_mgr_dce->dfs_bypass_disp_clk != actual_clock)
-			dmcu->funcs->set_psr_wait_loop(dmcu,
-					actual_clock / 1000 / 7);
+		if (dmcu && dmcu->funcs->is_dmcu_initialized(dmcu)) {
+			if (clk_mgr_dce->dfs_bypass_disp_clk != actual_clock)
+				dmcu->funcs->set_psr_wait_loop(dmcu,
+						actual_clock / 1000 / 7);
+		}
 	}
 
 	clk_mgr_dce->dfs_bypass_disp_clk = actual_clock;
-- 
2.14.1