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drm/amd/display: Change disable backlight ramp change threshold from 0 to maximum value. 

Instead of user set brightness with range of percentage,
HLK test set brightness level with range of normal, this will result in
HLK test case set brightness from 0 to 255, DC set brightness with ramp is 0,
and disabled ramp change which will fail the HLK test.
Fix:
In case of unblank stream and turn on edp, change brightness level in
stream to 0xFFFFFFFF(actural maximum level is 0xFF), use that value as
a flag to recogonize this the case of resume from S3.

Signed-off-by: Yongqiang Sun <yongqiang.sun@amd.com>
Reviewed-by: Eric Yang <eric.yang2@amd.com>
Acked-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Yongqiang Sun 2018-03-27 10:05:10 -04:00 committed by Alex Deucher
parent 8f121fe281
commit 5282cbe32e
3 changed files with 4 additions and 2 deletions
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2
drivers/gpu/drm/amd/display/dc/core/dc_link.c
View File

@ -1982,7 +1982,7 @@ bool dc_link_set_backlight_level(const struct dc_link *link, uint32_t level,
return false;
if (stream) {
if (stream->bl_pwm_level == 0)
if (stream->bl_pwm_level == EDP_BACKLIGHT_RAMP_DISABLE_LEVEL)
frame_ramp = 0;
((struct dc_stream_state *)stream)->bl_pwm_level = level;

2
drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c
View File

@ -1036,7 +1036,7 @@ void dce110_unblank_stream(struct pipe_ctx *pipe_ctx,
if (link->local_sink && link->local_sink->sink_signal == SIGNAL_TYPE_EDP) {
link->dc->hwss.edp_backlight_control(link, true);
stream->bl_pwm_level = 0;
stream->bl_pwm_level = EDP_BACKLIGHT_RAMP_DISABLE_LEVEL;
}
}
void dce110_blank_stream(struct pipe_ctx *pipe_ctx)

2
drivers/gpu/drm/amd/display/dc/inc/hw_sequencer.h
View File

@ -32,6 +32,8 @@
#include "inc/hw/link_encoder.h"
#include "core_status.h"
#define EDP_BACKLIGHT_RAMP_DISABLE_LEVEL 0xFFFFFFFF
enum pipe_gating_control {
PIPE_GATING_CONTROL_DISABLE = 0,
PIPE_GATING_CONTROL_ENABLE,