linux-kernel - Re: [PATCH v1 2/3] drm/tegra: plane: Implement zPos plane property for older Tegra's

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Date:   Fri, 4 May 2018 14:15:30 +0200
From:   Thierry Reding <thierry.reding@...il.com>
To:     Dmitry Osipenko <digetx@...il.com>
Cc:     dri-devel@...ts.freedesktop.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 2/3] drm/tegra: plane: Implement zPos plane property
 for older Tegra's

On Fri, May 04, 2018 at 03:08:43AM +0300, Dmitry Osipenko wrote:
> Older Tegra's do not support planes z position handling in hardware,
> but HW provides knobs for zPos implementation in software.
> 
> Signed-off-by: Dmitry Osipenko <digetx@...il.com>
> ---
>  drivers/gpu/drm/tegra/dc.c    | 134 ++++++++++++++++-------
>  drivers/gpu/drm/tegra/plane.c | 193 ++++++++++++++++++++++++----------
>  drivers/gpu/drm/tegra/plane.h |  13 ++-
>  3 files changed, 244 insertions(+), 96 deletions(-)

This is obviously a lot to review, but it looks pretty good. On minor
comment below.

> diff --git a/drivers/gpu/drm/tegra/dc.c b/drivers/gpu/drm/tegra/dc.c
> index 2e81142281c3..ba5481cd470d 100644
> --- a/drivers/gpu/drm/tegra/dc.c
> +++ b/drivers/gpu/drm/tegra/dc.c
> @@ -162,29 +162,90 @@ static void tegra_plane_setup_blending_legacy(struct tegra_plane *plane)
[...]
> +		case 1:
> +			/*
> +			 * When both middle and topmost windows have an alpha,
> +			 * these windows a mixed together and then the result
> +			 * is blended over the bottom window.
> +			 */
> +			if ((state->blending[0].alpha &&
> +			     state->blending[0].top))

There seems to be one pair of parentheses too much here.

Thierry

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