From: Maxime Ripard <maxime.ripard@bootlin.com>
To: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
Cc: Petri Latvala <petri.latvala@intel.com>,
eben@raspberrypi.org, igt-dev@lists.freedesktop.org,
Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Subject: Re: [igt-dev] [PATCH i-g-t v2 07/13] igt: fb: Account for all planes bpp
Date: Mon, 21 Jan 2019 14:10:37 +0100 [thread overview]
Message-ID: <20190121131037.vy4hbdjwbut2nob2@flea> (raw)
In-Reply-To: <096a36349f86ee387a8cc60f42d493f538baef12.camel@bootlin.com>
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On Thu, Jan 10, 2019 at 11:21:24AM +0100, Paul Kocialkowski wrote:
> On Tue, 2019-01-08 at 16:19 +0100, Maxime Ripard wrote:
> > When allocating a dumb buffer for a format with multiple plane, we need to
> > account for all plane's bpp in order to allocate the proper size.
> >
> > Let's add all the planes bpp and use the result to allocate our buffer.
>
> As discussed off-list, this approach doesn't work well when multiple
> planes and sub-sampling are involved, causing over-allocation.
>
> For instance, NV12 requires at least width * height * 1.5.
> The bpp for the second plane is 16 but with four times less pixels due
> to sub-sampling. Here, this would amount to width * height * 3 at
> least, so over-allocating.
>
> I think dividing each plane's bpp by the sub-sampling before adding it
> should work (with a round-up division to be on the safe side for cases
> where bpp cannot be exactly dividided by hsub * vsub in the future).
>
> What do you think?
It sounds great, thanks!
Maxime
--
Maxime Ripard, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com
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next prev parent reply other threads:[~2019-01-21 13:10 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-08 15:19 [igt-dev] [PATCH i-g-t v2 00/13] igt: chamelium: Test YUV buffers using the Chamelium Maxime Ripard
2019-01-08 15:19 ` [igt-dev] [PATCH i-g-t v2 01/13] igt: fb: Add subsampling parameters to the formats Maxime Ripard
2019-01-10 9:59 ` Paul Kocialkowski
2019-01-08 15:19 ` [igt-dev] [PATCH i-g-t v2 02/13] igt: fb: Reduce tile size alignment for non intel platforms Maxime Ripard
2019-01-10 9:59 ` Paul Kocialkowski
2019-01-08 15:19 ` [igt-dev] [PATCH i-g-t v2 03/13] igt: fb: generic YUV convertion function Maxime Ripard
2019-01-10 10:07 ` Paul Kocialkowski
2019-01-08 15:19 ` [igt-dev] [PATCH i-g-t v2 04/13] igt: fb: Move i915 YUV buffer clearing code to a function Maxime Ripard
2019-01-10 10:10 ` Paul Kocialkowski
2019-01-10 14:38 ` Ville Syrjälä
2019-01-14 15:13 ` Paul Kocialkowski
2019-01-14 16:40 ` Ville Syrjälä
2019-01-15 16:15 ` Paul Kocialkowski
2019-01-08 15:19 ` [igt-dev] [PATCH i-g-t v2 05/13] igt: fb: Move size computation to the common path Maxime Ripard
2019-01-10 10:10 ` Paul Kocialkowski
2019-01-10 10:43 ` Paul Kocialkowski
2019-01-08 15:19 ` [igt-dev] [PATCH i-g-t v2 06/13] igt: fb: Refactor dumb buffer allocation path Maxime Ripard
2019-01-10 10:11 ` Paul Kocialkowski
2019-01-08 15:19 ` [igt-dev] [PATCH i-g-t v2 07/13] igt: fb: Account for all planes bpp Maxime Ripard
2019-01-10 10:21 ` Paul Kocialkowski
2019-01-21 13:10 ` Maxime Ripard [this message]
2019-01-08 15:19 ` [igt-dev] [PATCH i-g-t v2 08/13] igt: fb: Clear YUV dumb buffers Maxime Ripard
2019-01-10 10:27 ` Paul Kocialkowski
2019-01-08 15:19 ` [igt-dev] [PATCH i-g-t v2 09/13] igt: fb: Rework YUV i915 allocation path Maxime Ripard
2019-01-08 15:19 ` [igt-dev] [PATCH i-g-t v2 10/13] igt: fb: Add a bunch of new YUV formats Maxime Ripard
2019-01-10 10:45 ` Paul Kocialkowski
2019-01-08 15:19 ` [igt-dev] [PATCH i-g-t v2 11/13] igt: tests: chamelium: Start to unify tests Maxime Ripard
2019-01-10 10:50 ` Paul Kocialkowski
2019-01-21 13:17 ` Maxime Ripard
2019-01-08 15:19 ` [igt-dev] [PATCH i-g-t v2 12/13] igt: tests: chamelium: Convert VGA tests to do_test_display Maxime Ripard
2019-01-10 10:50 ` Paul Kocialkowski
2019-01-08 15:19 ` [igt-dev] [PATCH i-g-t v2 13/13] igt: tests: chamelium: Add YUV formats tests Maxime Ripard
2019-01-10 10:54 ` Paul Kocialkowski
2019-01-08 15:31 ` [igt-dev] ✗ Fi.CI.BAT: failure for igt: chamelium: Test YUV buffers using the Chamelium (rev3) Patchwork
2019-01-08 17:59 ` [igt-dev] ✓ Fi.CI.BAT: success for igt: chamelium: Test YUV buffers using the Chamelium (rev4) Patchwork
2019-01-09 3:11 ` [igt-dev] ✓ Fi.CI.IGT: " Patchwork
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