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gma-display_probing: Enable panel power early

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Before probing the internal panels EDID, we have to wait for the panel
power up delay. To use this time, we enable the panel power before pro-
bing any port and can probe external ports during the delay. On a T420
this saves about 5ms without an external display connected and 15ms
with.

Change-Id: Idce2ebbdb60182c9161e0a92ee4d42ff50c95688
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/17759
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
This commit is contained in:
Nico Huber
2016-11-21 23:21:14 +01:00
parent 8c45bcfc4d
commit 6f9a50dbae
1 changed files with 18 additions and 4 deletions
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22
common/hw-gfx-gma-display_probing.adb
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@@ -128,7 +128,7 @@ is
if Success then
if Port = Internal then
Panel.On;
Panel.Wait_On;
end if;
Read_EDID (Raw_EDID, Port, Success);
end if;
@@ -162,9 +162,6 @@ is
pragma Warnings (GNATprove, On, "unused assignment to ""Raw_EDID""");
else
Success := False;
if Port = Internal then
Panel.Off;
end if;
end if;
end Probe_Port;
@@ -173,6 +170,8 @@ is
Ports : in Port_List;
Max_Pipe : in Pipe_Index := Pipe_Index'Last)
is
Probe_Internal : Boolean := False;
Port_Idx : Port_List_Range := Port_List_Range'First;
Success : Boolean;
begin
@@ -181,6 +180,16 @@ is
Mode => Invalid_Mode,
Framebuffer => Default_FB));
-- Turn panel on early to probe other ports during the power on delay.
for Idx in Port_List_Range loop
exit when Ports (Idx) = Disabled;
if Ports (Idx) = Internal then
Panel.On (Wait => False);
Probe_Internal := True;
exit;
end if;
end loop;
for Pipe in Pipe_Index range
Pipe_Index'First .. Pipe_Index'Min (Max_Pipe, Config.Max_Pipe)
loop
@@ -203,6 +212,11 @@ is
-- Restore power settings
Power_And_Clocks.Power_Set_To (Cur_Configs);
-- Turn panel power off if probing failed.
if Probe_Internal and not Port_Configured (Configs, Internal) then
Panel.Off;
end if;
end Scan_Ports;
end HW.GFX.GMA.Display_Probing;