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drm/amd/display: Add backlight support via AUX

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Several modern displays support HDR/OLED panel, and one of the
interesting changes provided by this technology is the new approach for
handling backlight. More precisely, in the traditional way, we use PWM
to manage display backlight; however, with HDR/OLED we begin to use DP
Aux channel for adjusting the backlight.

This patch, enable the backlight control in HDR/OLED display via DP Aux.

Signed-off-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Reviewed-by: Harry Wentland <Harry.Wentland@amd.com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Rodrigo Siqueira
2020-01-24 10:44:20 -05:00
committed by Alex Deucher
parent 8a683eb631
commit 945628101b
2 changed files with 166 additions and 27 deletions
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34
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h
View File

@@ -90,15 +90,41 @@ struct dm_comressor_info {
};
/**
* struct amdgpu_dm_backlight_caps - Usable range of backlight values from ACPI
* @min_input_signal: minimum possible input in range 0-255
* @max_input_signal: maximum possible input in range 0-255
* @caps_valid: true if these values are from the ACPI interface
* struct amdgpu_dm_backlight_caps - Information about backlight
*
* Describe the backlight support for ACPI or eDP AUX.
*/
struct amdgpu_dm_backlight_caps {
/**
* @ext_caps: Keep the data struct with all the information about the
* display support for HDR.
*/
union dpcd_sink_ext_caps *ext_caps;
/**
* @aux_min_input_signal: Min brightness value supported by the display
*/
u32 aux_min_input_signal;
/**
* @aux_max_input_signal: Max brightness value supported by the display
* in nits.
*/
u32 aux_max_input_signal;
/**
* @min_input_signal: minimum possible input in range 0-255.
*/
int min_input_signal;
/**
* @max_input_signal: maximum possible input in range 0-255.
*/
int max_input_signal;
/**
* @caps_valid: true if these values are from the ACPI interface.
*/
bool caps_valid;
/**
* @aux_support: Describes if the display supports AUX backlight.
*/
bool aux_support;
};
/**