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From: Eric Anholt <eric@anholt.net>
To: Maxime Ripard <maxime.ripard@bootlin.com>
Cc: eben@raspberrypi.org, Maxime Ripard <maxime.ripard@bootlin.com>,
	Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
	dri-devel@lists.freedesktop.org,
	Paul Kocialkowski <paul.kocialkowski@bootlin.com>,
	Sean Paul <seanpaul@chromium.org>,
	Thomas Petazzoni <thomas.petazzoni@bootlin.com>,
	linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH] drm/vc4: Use 16bpp by default for the fbdev buffer
Date: Wed, 06 Mar 2019 09:32:01 -0800	[thread overview]
Message-ID: <87ef7jkiy6.fsf@anholt.net> (raw)
In-Reply-To: <20190306140245.21973-1-maxime.ripard@bootlin.com>


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Maxime Ripard <maxime.ripard@bootlin.com> writes:

> The preferred bpp for the fbdev emulation buffer has been 32 so far, which
> means that by default we will allocate an 8MB buffer with a 1920x1080
> resolution.
>
> Worse this memory will be allocated from the CMA pool, and will never be
> freed even if we don't use the fbdev emulation. Therefore, reducing it is a
> big deal, and switching to 16bpp by default will gain us around 4MB at
> 1920x1080, while keeping decent color depth. And users still have the
> option to switch to 32bpp using the kernel command line.

Reviewed-by: Eric Anholt <eric@anholt.net>

This matches the defaults used by the bcm2708 fbdev driver that we're
trying to get people to switch off of.

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_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

WARNING: multiple messages have this Message-ID (diff)
From: Eric Anholt <eric@anholt.net>
Cc: eben@raspberrypi.org, Maxime Ripard <maxime.ripard@bootlin.com>,
	dri-devel@lists.freedesktop.org,
	Paul Kocialkowski <paul.kocialkowski@bootlin.com>,
	Sean Paul <seanpaul@chromium.org>,
	Thomas Petazzoni <thomas.petazzoni@bootlin.com>,
	linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH] drm/vc4: Use 16bpp by default for the fbdev buffer
Date: Wed, 06 Mar 2019 09:32:01 -0800	[thread overview]
Message-ID: <87ef7jkiy6.fsf@anholt.net> (raw)
In-Reply-To: <20190306140245.21973-1-maxime.ripard@bootlin.com>


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Maxime Ripard <maxime.ripard@bootlin.com> writes:

> The preferred bpp for the fbdev emulation buffer has been 32 so far, which
> means that by default we will allocate an 8MB buffer with a 1920x1080
> resolution.
>
> Worse this memory will be allocated from the CMA pool, and will never be
> freed even if we don't use the fbdev emulation. Therefore, reducing it is a
> big deal, and switching to 16bpp by default will gain us around 4MB at
> 1920x1080, while keeping decent color depth. And users still have the
> option to switch to 32bpp using the kernel command line.

Reviewed-by: Eric Anholt <eric@anholt.net>

This matches the defaults used by the bcm2708 fbdev driver that we're
trying to get people to switch off of.

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_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel

  parent reply	other threads:[~2019-03-06 17:32 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-03-06 14:02 [PATCH] drm/vc4: Use 16bpp by default for the fbdev buffer Maxime Ripard
2019-03-06 14:02 ` Maxime Ripard
2019-03-06 15:06 ` Paul Kocialkowski
2019-03-06 15:06   ` Paul Kocialkowski
2019-03-06 17:32 ` Eric Anholt [this message]
2019-03-06 17:32   ` Eric Anholt
2019-03-07 12:14 ` Maxime Ripard
2019-03-07 12:14   ` Maxime Ripard

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