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gma: Validate maximum scalable width

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Change-Id: Iba8199a2451e1976ac8aa0f8632d0846fc0caeb4
Signed-off-by: Nico Huber <nico.huber@secunet.com>
Reviewed-on: https://review.coreboot.org/17261
Tested-by: Nico Huber <nico.h@gmx.de>
Reviewed-by: Martin Roth <martinroth@google.com>
This commit is contained in:
Nico Huber
2016-11-03 20:15:39 +01:00
committed by Nico Huber
parent c7a4fee02f
commit dcd274b28d
2 changed files with 27 additions and 4 deletions
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18
common/hw-gfx-gma-config.ads.template
View File

@@ -228,4 +228,22 @@ is
24_000_000),
when Skylake => 24_000_000);
----------------------------------------------------------------------------
-- Maximum source width with enabled scaler. This only accounts
-- for simple 1:1 pipe:scaler mappings.
type Width_Per_Pipe is array (Config_Index) of Width_Type;
Maximum_Scalable_Width : constant Width_Per_Pipe :=
(case CPU is
when Ironlake..Haswell =>
(Primary => 4096,
Secondary => 2048,
Tertiary => 2048),
when Broadwell..Skylake =>
(Primary => 4096,
Secondary => 4096,
Tertiary => 4096));
end HW.GFX.GMA.Config;

13
common/hw-gfx-gma.adb
View File

@@ -179,17 +179,22 @@ is
function Validate_Config
(Framebuffer : Framebuffer_Type;
Port_Cfg : Port_Config)
Port_Cfg : Port_Config;
I : Config_Index)
return Boolean
with Global => null
is
begin
-- No downscaling
-- Respect maximum scalable width
-- Only 32bpp RGB
-- Stride must be a multiple of 64
return
Framebuffer.Width <= Pos32 (Port_Cfg.Mode.H_Visible) and
Framebuffer.Height <= Pos32 (Port_Cfg.Mode.V_Visible) and
((Framebuffer.Width = Pos32 (Port_Cfg.Mode.H_Visible) and
Framebuffer.Height = Pos32 (Port_Cfg.Mode.V_Visible)) or
(Framebuffer.Width <= Config.Maximum_Scalable_Width (I) and
Framebuffer.Width <= Pos32 (Port_Cfg.Mode.H_Visible) and
Framebuffer.Height <= Pos32 (Port_Cfg.Mode.V_Visible))) and
Framebuffer.BPC = 8 and
Framebuffer.Stride mod 64 = 0;
end Validate_Config;
@@ -542,7 +547,7 @@ is
Fill_Port_Config (Port_Cfg, Configs, I, Success);
Success := Success and then
Validate_Config (New_Config.Framebuffer, Port_Cfg);
Validate_Config (New_Config.Framebuffer, Port_Cfg, I);
if Success and then Wait_For_HPD (New_Config.Port) then
Check_HPD (Port_Cfg, New_Config.Port, Success);