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drm/amd/display: Implement backlight_ops.get_brightness 

[Why]
This hook that is supposed to read the actual backlight value
is used in a few places throughout the kernel to setup or force
update on backlight

[How]
Create a dc function that calls the existing abm function, and
call that function from amdgpu

Signed-off-by: David Francis <David.Francis@amd.com>
Reviewed-by: Harry Wentland <Harry.Wentland@amd.com>
Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
hifive-unleashed-5.1
David Francis 2018-07-19 11:25:05 -04:00 committed by Alex Deucher
parent 0301ccbaf6
commit 620a0d27b2
3 changed files with 17 additions and 1 deletions
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7
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
View File

@ -1320,7 +1320,12 @@ static int amdgpu_dm_backlight_update_status(struct backlight_device *bd)
static int amdgpu_dm_backlight_get_brightness(struct backlight_device *bd)
{
return bd->props.brightness;
struct amdgpu_display_manager *dm = bl_get_data(bd);
int ret = dc_link_get_backlight_level(dm->backlight_link);
if (ret == DC_ERROR_UNEXPECTED)
return bd->props.brightness;
return ret;
}
static const struct backlight_ops amdgpu_dm_backlight_ops = {

9
drivers/gpu/drm/amd/display/dc/core/dc_link.c
View File

@ -2026,6 +2026,15 @@ enum dc_status dc_link_validate_mode_timing(
return DC_OK;
}
int dc_link_get_backlight_level(const struct dc_link *link)
{
struct abm *abm = link->ctx->dc->res_pool->abm;
if (abm == NULL || abm->funcs->get_current_backlight_8_bit == NULL)
return DC_ERROR_UNEXPECTED;
return (int) abm->funcs->get_current_backlight_8_bit(abm);
}
bool dc_link_set_backlight_level(const struct dc_link *link, uint32_t level,
uint32_t frame_ramp, const struct dc_stream_state *stream)

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

@ -141,6 +141,8 @@ static inline struct dc_link *dc_get_link_at_index(struct dc *dc, uint32_t link_
bool dc_link_set_backlight_level(const struct dc_link *dc_link, uint32_t level,
uint32_t frame_ramp, const struct dc_stream_state *stream);
int dc_link_get_backlight_level(const struct dc_link *dc_link);
bool dc_link_set_abm_disable(const struct dc_link *dc_link);
bool dc_link_set_psr_enable(const struct dc_link *dc_link, bool enable, bool wait);