diff options
Diffstat (limited to 'meta-amd-bsp/recipes-kernel/linux/linux-yocto-4.19.8/2463-drm-amd-display-do-not-power-on-eDP-power-rail-early.patch')
| -rw-r--r-- | meta-amd-bsp/recipes-kernel/linux/linux-yocto-4.19.8/2463-drm-amd-display-do-not-power-on-eDP-power-rail-early.patch | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/meta-amd-bsp/recipes-kernel/linux/linux-yocto-4.19.8/2463-drm-amd-display-do-not-power-on-eDP-power-rail-early.patch b/meta-amd-bsp/recipes-kernel/linux/linux-yocto-4.19.8/2463-drm-amd-display-do-not-power-on-eDP-power-rail-early.patch new file mode 100644 index 00000000..72d5c5f0 --- /dev/null +++ b/meta-amd-bsp/recipes-kernel/linux/linux-yocto-4.19.8/2463-drm-amd-display-do-not-power-on-eDP-power-rail-early.patch @@ -0,0 +1,52 @@ +From f0745c65d7de181198e7aced4a373cf8b5a61b87 Mon Sep 17 00:00:00 2001 +From: Anthony Koo <Anthony.Koo@amd.com> +Date: Fri, 10 May 2019 14:57:48 -0400 +Subject: [PATCH 2463/2940] drm/amd/display: do not power on eDP power rail + early + +[Why] +Modern Standby may toggle display adapter state between D0 +and D3 state unpredictably. +But events that cause transition to D0 are not always resulting +in a display light up scenario. + +Modern eDP panels should be able to power on panel logic +quickly upon VDD going high. Based on spec, the T3 time +between VDD on and HPD high can be between 0 and 80 ms. + +Doing any tricky sorts of optimization by powering on panel +VDD early during D0 transition on can negatively impact other +features due to unnecessary power drain and toggling when +final system state does not intend for the panel to be lit up. + +We need OEMs to source higher end panels that have T3 time +close to 0 if they want quick S3/Modern Standby resume times. + +[How] +Remove panel VDD power on in init_hw + +Signed-off-by: Anthony Koo <Anthony.Koo@amd.com> +Reviewed-by: Tony Cheng <Tony.Cheng@amd.com> +Acked-by: Leo Li <sunpeng.li@amd.com> +Signed-off-by: Alex Deucher <alexander.deucher@amd.com> +--- + drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c | 3 --- + 1 file changed, 3 deletions(-) + +diff --git a/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c b/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c +index 2a34447112e9..f6e25f75a0a9 100644 +--- a/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c ++++ b/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c +@@ -547,9 +547,6 @@ static void dcn20_init_hw(struct dc *dc) + */ + struct dc_link *link = dc->links[i]; + +- if (link->link_enc->connector.id == CONNECTOR_ID_EDP) +- dc->hwss.edp_power_control(link, true); +- + link->link_enc->funcs->hw_init(link->link_enc); + } + } +-- +2.17.1 + |