[U-Boot] [PATCH v3 08/18] tegra: Add SOC support for display/lcd

[Thierry Reding <thierry.reding@avionic-design.de>]

On Thu, Jul 19, 2012 at 05:24:35PM +0900, Adam Jiang wrote:
> On Thu, Jul 19, 2012 at 03:37:07PM +0800, Thierry Reding wrote:
> > * PGP Signed by an unknown key
> > 
> > On Thu, Jul 12, 2012 at 08:25:08AM -0700, Simon Glass wrote:
> > > From: Wei Ni <wni@nvidia.com>
> > > 
> > > Add support for the LCD peripheral at the Tegra2 SOC level. A separate
> > > LCD driver will use this functionality to configure the display.
> > > 
> > > Mayuresh Kulkarni:
> > > - changes to remove bitfields and clean up for submission
> > > 
> > > Simon Glass:
> > > - simplify code, move clock control into here, clean-up
> > > 
> > > Signed-off-by: Mayuresh Kulkarni <mkulkarni@nvidia.com>
> > > Signed-off-by: Simon Glass <sjg@chromium.org>
> > > ---
> > > Changes in v3:
> > > - Add probe function to read in fdt parameters in display driver
> > > - Separate display driver and LCD driver more in fdt
> > > 
> > >  arch/arm/cpu/armv7/tegra2/Makefile         |    2 +-
> > >  arch/arm/cpu/armv7/tegra2/display.c        |  389 ++++++++++++++++++++
> > >  arch/arm/include/asm/arch-tegra2/dc.h      |  544 ++++++++++++++++++++++++++++
> > >  arch/arm/include/asm/arch-tegra2/display.h |  152 ++++++++
> > >  include/fdtdec.h                           |    1 +
> > >  lib/fdtdec.c                               |    1 +
> > >  6 files changed, 1088 insertions(+), 1 deletions(-)
> > >  create mode 100644 arch/arm/cpu/armv7/tegra2/display.c
> > >  create mode 100644 arch/arm/include/asm/arch-tegra2/dc.h
> > >  create mode 100644 arch/arm/include/asm/arch-tegra2/display.h
> > > 
> > [...]
> > > diff --git a/arch/arm/cpu/armv7/tegra2/display.c b/arch/arm/cpu/armv7/tegra2/display.c
> > [...]
> > > +int setup_window(struct disp_ctl_win *win, struct fdt_disp_config *config)
> > > +{
> > > +	win->x = 0;
> > > +	win->y = 0;
> > > +	win->w = config->width;
> > > +	win->h = config->height;
> > > +	win->out_x = 0;
> > > +	win->out_y = 0;
> > > +	win->out_w = config->width;
> > > +	win->out_h = config->height;
> > > +	win->phys_addr = config->frame_buffer;
> > > +	win->stride = config->width * (1 << config->log2_bpp) / 8;
> > > +	debug("%s: depth = %d\n", __func__, config->log2_bpp);
> > > +	switch (config->log2_bpp) {
> > > +	case 5:
> > > +	case 24:
> > 
> > What's the 24 doing here?
> 
> This has been explained in the definition of the log2_bpp. When bpp is
> 24, the integer holds 24 itself because there is no 2^N expression for
> it.

Right, I missed that. Thanks.

Thierry
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