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drm/amd/display: Fix NULL ptr when calculating refresh rate 

Calculate preferred refresh rate only when preferred mode exists.

Signed-off-by: Jerry (Fangzhi) Zuo <Jerry.Zuo@amd.com>
Reviewed-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Jerry (Fangzhi) Zuo 2018-11-27 10:51:12 -05:00 committed by Alex Deucher
parent 8b955e00d4
commit 58124bf8f4
1 changed files with 2 additions and 3 deletions
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5
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
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@ -2848,7 +2848,7 @@ create_stream_for_sink(struct amdgpu_dm_connector *aconnector,
bool native_mode_found = false;
bool scale = dm_state ? (dm_state->scaling != RMX_OFF) : false;
int mode_refresh;
int preferred_refresh;
int preferred_refresh = 0;
struct dc_sink *sink = NULL;
if (aconnector == NULL) {
@ -2902,13 +2902,12 @@ create_stream_for_sink(struct amdgpu_dm_connector *aconnector,
decide_crtc_timing_for_drm_display_mode(
&mode, preferred_mode,
dm_state ? (dm_state->scaling != RMX_OFF) : false);
preferred_refresh = drm_mode_vrefresh(preferred_mode);
}
if (!dm_state)
drm_mode_set_crtcinfo(&mode, 0);
preferred_refresh = drm_mode_vrefresh(preferred_mode);
/*
* If scaling is enabled and refresh rate didn't change
* we copy the vic and polarities of the old timings