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Diffstat (limited to 'Documentation/gfx/libgfxinit.md')
| -rw-r--r-- | Documentation/gfx/libgfxinit.md | 26 |
1 files changed, 18 insertions, 8 deletions
diff --git a/Documentation/gfx/libgfxinit.md b/Documentation/gfx/libgfxinit.md index 0608363906..bb4528b958 100644 --- a/Documentation/gfx/libgfxinit.md +++ b/Documentation/gfx/libgfxinit.md @@ -65,11 +65,20 @@ board can initialize graphics through *libgfxinit*: select MAINBOARD_HAS_LIBGFXINIT Internal ports share some hardware blocks (e.g. backlight, panel -power sequencer). Therefore, each board has to select either eDP -or LVDS as the internal port, if any: +power sequencer). Therefore, each system with an integrated panel +should set `GFX_GMA_PANEL_1_PORT` to the respective port, e.g.: - select GFX_GMA_INTERNAL_IS_EDP # the default, or - select GFX_GMA_INTERNAL_IS_LVDS + config GFX_GMA_PANEL_1_PORT + default "DP3" + +For the most common cases, LVDS and eDP, exists a shorthand, one +can select either: + + select GFX_GMA_PANEL_1_ON_EDP # the default, or + select GFX_GMA_PANEL_1_ON_LVDS + +Some newer chips feature a second block of panel control logic. +For this, `GFX_GMA_PANEL_2_PORT` can be set. Boards with a DVI-I connector share the DDC (I2C) pins for both analog and digital displays. In this case, *libgfxinit* needs to @@ -96,7 +105,8 @@ You can select from the following Ports: type Port_Type is (Disabled, -- optionally terminates the list - Internal, -- either eDP or LVDS as selected in Kconfig + LVDS, + eDP, DP1, DP2, DP3, @@ -112,8 +122,7 @@ both DPx and HDMIx should be listed. A good example is the mainboard Kontron/KTQM77, it features two DP++ ports (DP2/HDMI2, DP3/HDMI3), one DVI-I port (HDMI1/Analog), -eDP and LVDS. Due to the constraints mentioned above, only one of -eDP and LVDS can be enabled. It defines `ports` as follows: +eDP and LVDS. It defines `ports` as follows: ports : constant Port_List := (DP2, @@ -122,7 +131,8 @@ eDP and LVDS can be enabled. It defines `ports` as follows: HDMI2, HDMI3, Analog, - Internal, + LVDS, + eDP, others => Disabled); The `GMA.gfxinit()` procedure probes for display EDIDs in the |