From: Joshua Aberback <[email protected]> [Why] Currently there's an issue on DCN401 that prevents oled eDP panels from being lit up that is still under investigation. To unblock dev work while investigating, we can work around the issue by skipping toggling the enablement of the backlight.
[How] - new debug bit that will skip touching backlight enable DPCD for oled Reviewed-by: Alvin Lee <[email protected]> Reviewed-by: Wenjing Liu <[email protected]> Acked-by: Zaeem Mohamed <[email protected]> Signed-off-by: Joshua Aberback <[email protected]> --- drivers/gpu/drm/amd/display/dc/dc.h | 1 + .../drm/amd/display/dc/link/protocols/link_edp_panel_control.c | 3 +++ .../gpu/drm/amd/display/dc/resource/dcn401/dcn401_resource.c | 1 + 3 files changed, 5 insertions(+) diff --git a/drivers/gpu/drm/amd/display/dc/dc.h b/drivers/gpu/drm/amd/display/dc/dc.h index d0ed01ac460d..a06015165a61 100644 --- a/drivers/gpu/drm/amd/display/dc/dc.h +++ b/drivers/gpu/drm/amd/display/dc/dc.h @@ -1042,6 +1042,7 @@ struct dc_debug_options { unsigned int force_easf; unsigned int force_sharpness; unsigned int force_lls; + bool edp_oled_no_backlight_enable; }; diff --git a/drivers/gpu/drm/amd/display/dc/link/protocols/link_edp_panel_control.c b/drivers/gpu/drm/amd/display/dc/link/protocols/link_edp_panel_control.c index ad9aca790dd7..89f66d88c3b0 100644 --- a/drivers/gpu/drm/amd/display/dc/link/protocols/link_edp_panel_control.c +++ b/drivers/gpu/drm/amd/display/dc/link/protocols/link_edp_panel_control.c @@ -248,6 +248,9 @@ bool edp_backlight_enable_aux(struct dc_link *link, bool enable) link->connector_signal != SIGNAL_TYPE_DISPLAY_PORT)) return false; + if (link->dc->debug.edp_oled_no_backlight_enable && link->dpcd_sink_ext_caps.bits.oled) + return true; + if (core_link_write_dpcd(link, DP_SOURCE_BACKLIGHT_ENABLE, &backlight_enable, 1) != DC_OK) return false; diff --git a/drivers/gpu/drm/amd/display/dc/resource/dcn401/dcn401_resource.c b/drivers/gpu/drm/amd/display/dc/resource/dcn401/dcn401_resource.c index 247bac177d1b..92206b69b2f7 100644 --- a/drivers/gpu/drm/amd/display/dc/resource/dcn401/dcn401_resource.c +++ b/drivers/gpu/drm/amd/display/dc/resource/dcn401/dcn401_resource.c @@ -732,6 +732,7 @@ static const struct dc_debug_options debug_defaults_drv = { }, .force_cositing = CHROMA_COSITING_TOPLEFT + 1, .disable_idle_power_optimizations = true, + .edp_oled_no_backlight_enable = true, }; static struct dce_aux *dcn401_aux_engine_create( -- 2.34.1
