linux-kernel - Re: [PATCH 02/10] drm/sun4i: Disable YUV channel when using the frontend and set interlace

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Date:   Fri, 23 Mar 2018 10:55:29 +0100
From:   Maxime Ripard <maxime.ripard@...tlin.com>
To:     Paul Kocialkowski <paul.kocialkowski@...tlin.com>
Cc:     linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org,
        David Airlie <airlied@...ux.ie>, Chen-Yu Tsai <wens@...e.org>,
        Daniel Vetter <daniel.vetter@...el.com>,
        Gustavo Padovan <gustavo@...ovan.org>,
        Sean Paul <seanpaul@...omium.org>
Subject: Re: [PATCH 02/10] drm/sun4i: Disable YUV channel when using the
 frontend and set interlace

On Wed, Mar 21, 2018 at 04:28:56PM +0100, Paul Kocialkowski wrote:
> The YUV channel was only disabled in sun4i_backend_update_layer_formats,
> which is not called when the frontend is selected.
> 
> Thus, creating a layer with a YUV format handled by the backend and then
> switching to a format that requires the frontend would keep the YUV
> channel enabled for the layer.
> 
> This explicitly disables the YUV channel for the layer when using the
> frontend as well. It also sets the relevant interlace bit, which was
> missing in the frontend path as well.

This should be part of a separate patch. Usually, if you write "it
also does..." at the end of your commit log, it's a pretty good
indication that it should be another patch :)

> Signed-off-by: Paul Kocialkowski <paul.kocialkowski@...tlin.com>
> ---
>  drivers/gpu/drm/sun4i/sun4i_backend.c | 17 ++++++++++++++++-
>  drivers/gpu/drm/sun4i/sun4i_backend.h |  3 ++-
>  drivers/gpu/drm/sun4i/sun4i_layer.c   |  2 +-
>  3 files changed, 19 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/gpu/drm/sun4i/sun4i_backend.c b/drivers/gpu/drm/sun4i/sun4i_backend.c
> index e07a33adc51d..b98dafda52f8 100644
> --- a/drivers/gpu/drm/sun4i/sun4i_backend.c
> +++ b/drivers/gpu/drm/sun4i/sun4i_backend.c
> @@ -294,8 +294,10 @@ int sun4i_backend_update_layer_formats(struct sun4i_backend *backend,
>  }
>  
>  int sun4i_backend_update_layer_frontend(struct sun4i_backend *backend,
> -					int layer, uint32_t fmt)
> +					int layer, struct drm_plane *plane,
> +					uint32_t fmt)
>  {
> +	bool interlaced = false;

There's no need to pass the full drm_plane pointer, you can just pass
a boolean to tell if it is interlaced or not.

Maxime

-- 
Maxime Ripard, Bootlin (formerly Free Electrons)
Embedded Linux and Kernel engineering
https://bootlin.com