Re: [PATCH v4 1/1] drm/fb-helper: implement ioctl FBIO_WAITFORVSYNC

From	Stefan Lengfeld <contact@stefanchrist.eu>
Newsgroups	linux.kernel
Subject	Re: [PATCH v4 1/1] drm/fb-helper: implement ioctl FBIO_WAITFORVSYNC
Date	2017-03-06 00:00 +0100
Message-ID	<thNi9-79L-7@gated-at.bofh.it> (permalink)
References	<tfS2B-6kf-9@gated-at.bofh.it> <tfS2B-6kf-7@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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Hi Maxime,

On Tue, Feb 28, 2017 at 04:36:51PM +0100, Maxime Ripard wrote:
> Implement legacy framebuffer ioctl FBIO_WAITFORVSYNC in the generic
> framebuffer emulation driver. Legacy framebuffer users like non kms/drm
> based OpenGL(ES)/EGL implementations may require the ioctl to
> synchronize drawing or buffer flip for double buffering. It is tested on
> the i.MX6.
> 
> Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
> Tested-by: Neil Armstrong <narmstrong@baylibre.com>
> ---
>  drivers/gpu/drm/drm_fb_helper.c | 68 ++++++++++++++++++++++++++++++++++-
>  include/drm/drm_fb_helper.h     | 12 +++++-
>  2 files changed, 79 insertions(+), 1 deletion(-)

I have tested the current HEAD of drm-misc-next. It includes this patch
and the patch ("drm/fb-helper: Add multi buffer support for cma fbdev").
On my i.MX6 board with HDMI output both patches work as advertised.
Multi-buffering with ioctls FBIO_WAITFORVSYNC and FBIOPAN_DISPLAY is
possible.

Kind Regards
    Stefan Lengfeld

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Re: [PATCH v4 1/1] drm/fb-helper: implement ioctl FBIO_WAITFORVSYNC Stefan Lengfeld <contact@stefanchrist.eu> - 2017-03-06 00:00 +0100

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