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drm/amd/display: Increase Backlight Gain Step Size

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[Why]
Some backlight tests fail due to backlight settling
taking too long. This happens because the step
size used to change backlight levels is too small.

[How]
1. Change the size of the backlight gain step size
2. Change how DMCU firmware gets the step size value
   so that it is passed in by driver during DMCU initn

Signed-off-by: Eryk Brol <eryk.brol@amd.com>
Reviewed-by: Jun Lei <Jun.Lei@amd.com>
Acked-by: Leo Li <sunpeng.li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Eryk Brol 2019-05-15 15:12:41 -04:00 committed by Alex Deucher
parent 8633d96d3c
commit e25228b02e
2 changed files with 5 additions and 0 deletions
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3
drivers/gpu/drm/amd/display/dc/dce/dce_dmcu.c
View File

@ -388,6 +388,9 @@ static bool dcn10_dmcu_init(struct dmcu *dmcu)
/* Set initialized ramping boundary value */
REG_WRITE(MASTER_COMM_DATA_REG1, 0xFFFF);
/* Set backlight ramping stepsize */
REG_WRITE(MASTER_COMM_DATA_REG2, abm_gain_stepsize);
/* Set command to initialize microcontroller */
REG_UPDATE(MASTER_COMM_CMD_REG, MASTER_COMM_CMD_REG_BYTE0,
MCP_INIT_DMCU);

2
drivers/gpu/drm/amd/display/dc/dce/dce_dmcu.h
View File

@ -263,4 +263,6 @@ struct dmcu *dcn10_dmcu_create(
void dce_dmcu_destroy(struct dmcu **dmcu);
static const uint32_t abm_gain_stepsize = 0x0060;
#endif /* _DCE_ABM_H_ */