From: Maxime Ripard <maxime@cerno.tech>
To: Andrey Lebedev <andrey.lebedev@gmail.com>
Cc: airlied@linux.ie, linux-kernel@vger.kernel.org,
dri-devel@lists.freedesktop.org, wens@csie.org,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH 1/1] Support LVDS output on Allwinner A20
Date: Fri, 14 Feb 2020 08:58:35 +0100 [thread overview]
Message-ID: <20200214075835.xugmte6uigmsxqog@gilmour.lan> (raw)
In-Reply-To: <20200213181110.GA25367@kedthinkpad>
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On Thu, Feb 13, 2020 at 08:11:10PM +0200, Andrey Lebedev wrote:
> On Thu, Feb 13, 2020 at 10:24:33AM +0100, Maxime Ripard wrote:
> > > > do you have a board when you have been able to test it?
> > >
> > > Yes, I have the hardware (Cubieboard 2) at hand, but I cannot change the
> > > any physical connections on it. FWIW, it is https://openvario.org, the
> > > device we are (painfully) trying to upgrade from old kernel-3.4 with
> > > proprietary mali drivers to contemporary software.
> >
> > What painpoints do you have?
>
> So, even though proprietary mali drivers worked well for us, they seem
> to hold us back to old kernel-3.4, and it started to get harder to avoid
> various compatibility issues with newer software. Since there seemed to
> be a good progress with OSS lima driver lately, we decided to try to
> replace mali with lima. And that naturally pulled to switch to DRM/KMS.
You can use the proprietary mali drivers with mainline too, but yeah
it's in maintainance mode these days and you should go for lima if
you're (re)starting from scratch.
> The first painpoint is this LVDS support problem: after a week of trial
> and error, I discovered that support was simply not there. But it seemed
> that not that much was actually missing and after couple of evenings
> deep into debugging, here we are.
>
> Another one is the screen rotation: the device is installed into the
> glider' instrument panel, and some pilots prefer it in portrait
> orientation. Under old mali setup, all that (seemingly) was required
> was setting "fbcon=rotate:n" boot arg, and both linux console and
> graphical app (https://xcsoar.org/) rotated "automagically". With new
> DRM/KMS setup, only console is rotated, all graphical apps seem to see
> the screen in its "natural" landscape orientation. Do you know if there
> is any way to leverage DMS/KMS infrastructure to make screen appear
> rotated for userspace apps (writing to /sys/class/graphics/fb0/rotate
> didn't work)? There's of course a plan B to teach the app to rotate its
> output, but that leads to problem number 3.
There's a rotation property that can be set by whatever you're using
on top of KMS, DRM_MODE_ROTATE_*, but I'm not sure the driver supports
it at the moment.
> And the 3rd outstanding problem is that app doesn't really work under
> lima module and lima mesa driver. It starts, but renders a black window.
> I haven't dug deeply into this yet, but it is possible that some opengl
> API isn't supported in OSS drivers yet (even though app only renders 2d
> graphics).
I have no idea on this one though, sorry :/
Maxime
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next prev parent reply other threads:[~2020-02-17 8:21 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-10 19:56 [PATCH 1/1] Support LVDS output on Allwinner A20 Andrey Lebedev
2020-02-11 7:20 ` Maxime Ripard
2020-02-11 20:48 ` Andrey Lebedev
2020-02-12 12:53 ` Maxime Ripard
2020-02-12 22:46 ` Andrey Lebedev
2020-02-13 9:24 ` Maxime Ripard
2020-02-13 18:11 ` Andrey Lebedev
2020-02-14 7:58 ` Maxime Ripard [this message]
2020-02-12 22:23 ` [PATCH v2 1/2] ARM: sun7i: " andrey.lebedev
2020-02-13 9:32 ` Maxime Ripard
2020-02-12 22:23 ` [PATCH v2 2/2] ARM: sun7i: dts: Add LVDS panel support on A20 andrey.lebedev
2020-02-13 9:43 ` Maxime Ripard
2020-02-13 20:08 ` Andrey Lebedev
2020-02-14 7:52 ` Maxime Ripard
2020-02-14 8:43 ` Andrey Lebedev
2020-02-14 8:53 ` Maxime Ripard
2020-02-14 21:32 ` Andrey Lebedev
2020-02-17 17:51 ` Maxime Ripard
2020-02-18 17:50 ` Andrey Lebedev
2020-02-19 12:06 ` Maxime Ripard
2020-02-13 20:18 ` [PATCH v3 1/3] drm/sun4i: tcon: Introduce LVDS setup routine setting Andrey Lebedev
2020-02-13 20:18 ` [PATCH v3 2/3] drm/sun4i: tcon: Support LVDS output on Allwinner A20 Andrey Lebedev
2020-02-13 20:18 ` [PATCH v3 3/3] ARM: dts: sun7i: Add LVDS panel support on A20 Andrey Lebedev
2020-02-14 8:55 ` Maxime Ripard
2020-02-19 18:08 ` PATCH v4 Andrey Lebedev
2020-02-19 18:08 ` [PATCH 1/5] drm/sun4i: tcon: Introduce LVDS setup routine setting Andrey Lebedev
2020-02-20 17:21 ` Maxime Ripard
2020-02-20 18:19 ` Andrey Lebedev
2020-02-19 18:08 ` [PATCH 2/5] drm/sun4i: tcon: Separate quirks for tcon0 and tcon1 on A20 Andrey Lebedev
2020-02-20 17:22 ` Maxime Ripard
2020-02-19 18:08 ` [PATCH 3/5] ARM: dts: sun7i: Add LVDS panel support " Andrey Lebedev
2020-02-20 17:23 ` Maxime Ripard
2020-02-19 18:08 ` [PATCH 4/5] dt-bindings: display: sun4i: New compatibles for A20 tcons Andrey Lebedev
2020-02-20 17:24 ` Maxime Ripard
2020-02-19 18:08 ` [PATCH 5/5] drm/sun4i: tcon: Support LVDS output on Allwinner A20 Andrey Lebedev
2020-02-20 17:25 ` Maxime Ripard
2020-04-01 10:59 ` Andrey Lebedev
2020-04-01 12:14 ` Maxime Ripard
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