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drm/amd/display: fix crash on setmode when mode is close to bw limit

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[why]
during It's possible to call dcn_validate_bandwidth with no plane.
In that case, as we are only intersted in if output timing is supported or not,
even if we cannot support native resolution, we still want to support lower
resolution if it is valid

[how]
if there exist no surface, make viewport/rec_out size at max 1080p. It is
already known that 1080p x 6(max # of pipes) is supported, so if we fail
validation, it is because of the stream

Signed-off-by: Su Sung Chung <Su.Chung@amd.com>
Reviewed-by: Dmytro Laktyushkin <Dmytro.Laktyushkin@amd.com>
Acked-by: Leo Li <sunpeng.li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Su Sung Chung 2019-05-10 15:16:45 -04:00 committed by Alex Deucher
parent 88147df030
commit 4b0ab7dd37
1 changed files with 13 additions and 2 deletions
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15
drivers/gpu/drm/amd/display/dc/calcs/dcn_calcs.c
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@ -872,8 +872,19 @@ bool dcn_validate_bandwidth(
v->lb_bit_per_pixel[input_idx] = 30;
v->viewport_width[input_idx] = pipe->stream->timing.h_addressable;
v->viewport_height[input_idx] = pipe->stream->timing.v_addressable;
v->scaler_rec_out_width[input_idx] = pipe->stream->timing.h_addressable;
v->scaler_recout_height[input_idx] = pipe->stream->timing.v_addressable;
/*
* for cases where we have no plane, we want to validate up to 1080p
* source size because here we are only interested in if the output
* timing is supported or not. if we cannot support native resolution
* of the high res display, we still want to support lower res up scale
* to native
*/
if (v->viewport_width[input_idx] > 1920)
v->viewport_width[input_idx] = 1920;
if (v->viewport_height[input_idx] > 1080)
v->viewport_height[input_idx] = 1080;
v->scaler_rec_out_width[input_idx] = v->viewport_width[input_idx];
v->scaler_recout_height[input_idx] = v->viewport_height[input_idx];
v->override_hta_ps[input_idx] = 1;
v->override_vta_ps[input_idx] = 1;
v->override_hta_pschroma[input_idx] = 1;