From 2f5c030daa1dadccc16c701193ed2ef8391f2d85 Mon Sep 17 00:00:00 2001 From: David Francis Date: Thu, 19 Jul 2018 11:25:05 -0400 Subject: [PATCH] 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 --- drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 7 ++++++- drivers/gpu/drm/amd/display/dc/core/dc_link.c | 9 +++++++++ drivers/gpu/drm/amd/display/dc/dc_link.h | 2 ++ 3 files changed, 17 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c index 7a8c8c14c7d6..71256f1e5e74 100644 --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c @@ -1316,7 +1316,12 @@ 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 = { diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link.c b/drivers/gpu/drm/amd/display/dc/core/dc_link.c index 4de68fa074a0..14674a2b0b67 100644 --- a/drivers/gpu/drm/amd/display/dc/core/dc_link.c +++ b/drivers/gpu/drm/amd/display/dc/core/dc_link.c @@ -1996,6 +1996,15 @@ 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) diff --git a/drivers/gpu/drm/amd/display/dc/dc_link.h b/drivers/gpu/drm/amd/display/dc/dc_link.h index 070a56926308..22f4ddd219d1 100644 --- a/drivers/gpu/drm/amd/display/dc/dc_link.h +++ b/drivers/gpu/drm/amd/display/dc/dc_link.h @@ -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); -- 2.17.1