On Tue Jan 23, 2024 at 6:16 PM CET, Svyatoslav Ryhel wrote: > Tegra SoC has 2 independent display controllers called DC_A and > DC_B, they are handled differently by internal video devices like > DSI and HDMI controllers so it is important for last to know > which display controller is used to properly set up registers. > To achieve this, a pipe field was added to pdata to pass display > controller id to internal Tegra SoC devices. > > Tested-by: Agneli <po...@protonmail.ch> # Toshiba AC100 T20 > Tested-by: Robert Eckelmann <longnose...@gmail.com> # ASUS TF101 > Tested-by: Andreas Westman Dorcsak <hed...@yahoo.com> # ASUS Grouper E1565 > Tested-by: Ion Agorria <i...@agorria.com> # HTC One X > Tested-by: Svyatoslav Ryhel <clamo...@gmail.com> # Nvidia Tegratab T114 > Signed-off-by: Svyatoslav Ryhel <clamo...@gmail.com> > --- > drivers/video/tegra20/tegra-dc.c | 6 ++++++ > drivers/video/tegra20/tegra-dc.h | 3 +++ > 2 files changed, 9 insertions(+) > > diff --git a/drivers/video/tegra20/tegra-dc.c > b/drivers/video/tegra20/tegra-dc.c > index 5d8874f323..0e94e665ef 100644 > --- a/drivers/video/tegra20/tegra-dc.c > +++ b/drivers/video/tegra20/tegra-dc.c > @@ -45,6 +45,7 @@ struct tegra_lcd_priv { > unsigned pixel_clock; /* Pixel clock in Hz */ > int dc_clk[2]; /* Contains clk and its parent */ > bool rotation; /* 180 degree panel turn */ > + bool pipe; /* DC controller: 0 for A, 1 for B */
Bool is a poor choice, even if there's only two of them. This is a proper index, so it should be some sort of integer. Also, the device tree bindings for the display controller specify a "nvidia,head" property that can be used to identify these. If you add that to the U-Boot DT you can avoid looking up by name to map this value. Thierry
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