diff options
| author | David Zhang <dingchen.zhang@amd.com> | 2022-05-03 18:12:05 -0400 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2022-06-07 16:09:57 -0400 |
| commit | 6651875ad7796ed3cd84b3bafb3885d05bb543ff (patch) | |
| tree | 64fe0fb5a514386061c32651868ff12ebba2fa68 /drivers/gpu/drm/amd/display/dc/dc_link.h | |
| parent | 6bad4ff84cb57f548d42a41091159b750eed9ef9 (diff) | |
drm/amd/display: Add PSR-SU-RC support in DC
[Why]
PSR-SU Rate Control - or PSR-SU-RC - enables PSR-SU panels to work with
variable refresh rate to allow for more power savings. Lowering the
refresh rate can increase PSR residency by expanding the eDP main link
shut down duration. It can also lower panel power consumption.
There is a complication with PSR, since the eDP main link can be shut
down. Therefore, the timing controller (TCON) on the eDP sink nees to be
able to scan out its remote buffer independent of the main link. To
allow the eDP source to specify the sink's refresh rate while the link
is off, vendor-specific DPCD registers are used. This allows the eDP
source to then "Rate Control" the panel during PSR active.
[How]
Add DC support to communicate with PSR-SU-RC supported eDP sinks. The
sink will need to know the desired VTotal during PSR active.
This change only adds support to DC, support in amdgpu_dm is still
pending to enable this fully.
Signed-off-by: David Zhang <dingchen.zhang@amd.com>
Signed-off-by: Leo Li <sunpeng.li@amd.com>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu/drm/amd/display/dc/dc_link.h')
| -rw-r--r-- | drivers/gpu/drm/amd/display/dc/dc_link.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/display/dc/dc_link.h b/drivers/gpu/drm/amd/display/dc/dc_link.h index c4a42d758b4e..29c0040a6dd4 100644 --- a/drivers/gpu/drm/amd/display/dc/dc_link.h +++ b/drivers/gpu/drm/amd/display/dc/dc_link.h @@ -100,6 +100,7 @@ struct psr_settings { bool psr_feature_enabled; // PSR is supported by sink bool psr_allow_active; // PSR is currently active enum dc_psr_version psr_version; // Internal PSR version, determined based on DPCD + bool psr_vtotal_control_support; // Vtotal control is supported by sink /* These parameters are calculated in Driver, * based on display timing and Sink capabilities. @@ -325,6 +326,8 @@ void dc_link_blank_all_dp_displays(struct dc *dc); void dc_link_blank_all_edp_displays(struct dc *dc); void dc_link_blank_dp_stream(struct dc_link *link, bool hw_init); +bool dc_link_set_sink_vtotal_in_psr_active(const struct dc_link *link, + uint16_t psr_vtotal_idle, uint16_t psr_vtotal_su); /* Request DC to detect if there is a Panel connected. * boot - If this call is during initial boot. |