Hi,
On Mon, 2009-12-21 at 16:06 +0100, ext Y, Kishore wrote:
> From 2f873819a4b9eb0bd658db1e59408d8f0aeb14b6 Mon Sep 17 00:00:00 2001
> From: Sudeep Basavaraj <sudeep.basavaraj@xxxxxx>
> Date: Mon, 14 Dec 2009 18:54:51 +0530
> Subject: [PATCH] OMAP3630:DSS2:Enable Pre-Multiplied Alpha Support
>
> Enables dss to process color formats with pre-mulitplied alpha values.
> With this we can have alpha values defined for each pixel
> and hence can have different blending values for each pixel.
What does pre-multiplied alpha mean? The TRM didn't really open it up...
Don't we already have per pixel alpha when using ARGB/RGBA?
This patch seems to always set the bit on, never set it off. Is that the
purpose?
Tomi
> Signed-off-by: Sudeep Basavaraj <sudeep.basavaraj@xxxxxx>
> Signed-off-by: Kishore Y <kishore.y@xxxxxx>
> ---
> drivers/video/omap2/dss/dispc.c | 8 ++++++++
> 1 files changed, 8 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/video/omap2/dss/dispc.c b/drivers/video/omap2/dss/dispc.c
> index 6dabf4b..5f7819b 100644
> --- a/drivers/video/omap2/dss/dispc.c
> +++ b/drivers/video/omap2/dss/dispc.c
> @@ -913,6 +913,11 @@ static void _dispc_set_vid_color_conv(enum omap_plane plane, bool enable)
> dispc_write_reg(dispc_reg_att[plane], val);
> }
>
> +static void _dispc_set_alpha_blend_attrs(enum omap_plane plane, bool enable)
> +{
> + REG_FLD_MOD(dispc_reg_att[plane], enable ? 1 : 0, 28, 28);
> +}
> +
> void dispc_enable_replication(enum omap_plane plane, bool enable)
> {
> int bit;
> @@ -1689,6 +1694,9 @@ static int _dispc_setup_plane(enum omap_plane plane,
>
> _dispc_set_rotation_attrs(plane, rotation, mirror, color_mode);
>
> + if (cpu_is_omap3630() && (plane != OMAP_DSS_VIDEO1))
> + _dispc_set_alpha_blend_attrs(plane, 1);
> +
> if (plane != OMAP_DSS_VIDEO1)
> _dispc_setup_global_alpha(plane, global_alpha);
>
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