linux-kernel - Re: [PATCH v3] drm/gma500: depend on framebuffer

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CADvTj4rR5zt5iFTDrrYfNQ267KV896dHnjJHx6yq=e10+V_Okg@mail.gmail.com>
Date:   Mon, 11 Apr 2022 19:47:55 -0600
From:   James Hilliard <james.hilliard1@...il.com>
To:     Patrik Jakobsson <patrik.r.jakobsson@...il.com>
Cc:     dri-devel <dri-devel@...ts.freedesktop.org>,
        Randy Dunlap <rdunlap@...radead.org>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3] drm/gma500: depend on framebuffer

On Mon, Apr 11, 2022 at 3:27 AM Patrik Jakobsson
<patrik.r.jakobsson@...il.com> wrote:
>
> On Sun, Apr 10, 2022 at 10:05 PM James Hilliard
> <james.hilliard1@...il.com> wrote:
> >
> > On Sun, Apr 10, 2022 at 1:52 PM Patrik Jakobsson
> > <patrik.r.jakobsson@...il.com> wrote:
> > >
> > > On Sun, Apr 10, 2022 at 9:40 PM James Hilliard
> > > <james.hilliard1@...il.com> wrote:
> > > >
> > > > On Sun, Apr 10, 2022 at 1:36 PM Patrik Jakobsson
> > > > <patrik.r.jakobsson@...il.com> wrote:
> > > > >
> > > > > On Sat, Apr 9, 2022 at 6:23 AM James Hilliard <james.hilliard1@...il.com> wrote:
> > > > > >
> > > > > > Select the efi framebuffer if efi is enabled.
> > > > > >
> > > > > > This appears to be needed for video output to function correctly.
> > > > > >
> > > > > > Signed-off-by: James Hilliard <james.hilliard1@...il.com>
> > > > >
> > > > > Hi James,
> > > > > EFI_FB is its own driver and not needed by gma500 to drive its
> > > > > hardware. What makes you think it's required?
> > > >
> > > > I wasn't getting any HDMI video output without it enabled for some reason,
> > > > I assume it is doing some sort of initialization needed by gma500
> > > > during startup.
> > >
> > > Then it sounds like you might just be using EFI_FB and not gma500. Can
> > > you provide the kernel log with drm.debug=0x1f set on kernel
> > > command-line.
> >
> > Seems efifb loads first and then hands off to gma500
>
> That is how it normally works but efifb shouldn't change the state of
> the currently set mode so shouldn't affect gma500.
> From the logs I can see that you have LVDS (internal panel), HDMI and
> DP (3 displays in total) connected. This sounds wrong. Your version of
> gma500 (Cedarview) doesn't support more than 2 crtcs/pipes. This might
> be a problem.

Yeah, there's a bug there with the connector status, only DVI-D-1 is actually
connected, I have DP-2 and LVDS-1 turned off in weston.