From: Daniel Stone <daniel@fooishbar.org>
To: Sui Jingfeng <15330273260@189.cn>
Cc: Maxime Ripard <maxime@cerno.tech>,
Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
suijingfeng <suijingfeng@loongson.cn>,
David Airlie <airlied@linux.ie>,
dri-devel@lists.freedesktop.org,
Randy Dunlap <rdunlap@infradead.org>,
Roland Scheidegger <sroland@vmware.com>,
linux-mips@vger.kernel.org, Krzysztof Kozlowski <krzk@kernel.org>,
linux-kernel@vger.kernel.org,
Andrey Zhizhikin <andrey.zhizhikin@leica-geosystems.com>,
Rob Herring <robh+dt@kernel.org>,
Dan Carpenter <dan.carpenter@oracle.com>,
Sam Ravnborg <sam@ravnborg.org>
Subject: Re: [PATCH v6 1/3] drm/lsdc: add drm driver for loongson display controller
Date: Wed, 16 Feb 2022 13:46:18 +0000 [thread overview]
Message-ID: <CAPj87rOgk8A8s6MTqxcTO5EkS=ABpHQV3sHsAp7Yn2t3-N_SoQ@mail.gmail.com> (raw)
In-Reply-To: <def50622-fe08-01f7-83bd-e6e0bc39fe1b@189.cn>
On Wed, 9 Feb 2022 at 15:41, Sui Jingfeng <15330273260@189.cn> wrote:
> On 2022/2/9 16:43, Maxime Ripard wrote:
> > More fundamentally (and this extends to the CMA, caching and VRAM stuff
> > you explained above), why can't the driver pick the right decision all
> > the time and why would that be under the user control?
>
> The right decision for ls7a1000 is to use VRAM based helper, But sometimes
> we need CMA helper based solution. Because: The PRIME support is lost, use
> lsdc with etnaviv is not possible any more.
>
> Buffer sharing with etnaviv is no longer possible, loongson display controllers
> are simple which require scanout buffers to be physically contiguous.
Other systems have this limitation, and Mesa's 'kmsro' concept makes
this work transparently, as long as your driver can export dmabufs
when running in 'VRAM' mode.
Cheers,
Daniel
next prev parent reply other threads:[~2022-02-16 13:46 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-02-03 8:25 [PATCH v6 0/3] drm/lsdc: add drm driver for loongson display controller Sui Jingfeng
2022-02-03 8:25 ` [PATCH v6 2/3] dt-bindings: ls2k1000: add the display controller device node Sui Jingfeng
2022-02-03 8:50 ` Krzysztof Kozlowski
2022-02-16 14:01 ` Sui Jingfeng
2022-02-17 8:38 ` Krzysztof Kozlowski
2022-02-03 8:25 ` [PATCH v6 3/3] dt-bindings: mips: loongson: introduce board specific dts Sui Jingfeng
2022-02-03 8:49 ` Krzysztof Kozlowski
[not found] ` <20220203082546.3099-2-15330273260@189.cn>
2022-02-03 8:53 ` [PATCH v6 1/3] drm/lsdc: add drm driver for loongson display controller Krzysztof Kozlowski
2022-02-03 11:07 ` Dan Carpenter
2022-02-03 11:29 ` Krzysztof Kozlowski
2022-02-03 13:34 ` Dan Carpenter
[not found] ` <20220203085851.yqstkfgt4dz7rcnw@houat>
2022-02-03 15:47 ` Sui Jingfeng
2022-02-09 8:52 ` Maxime Ripard
2022-02-09 11:56 ` Jiaxun Yang
2022-02-09 14:04 ` Maxime Ripard
2022-02-09 14:14 ` Jiaxun Yang
2023-02-03 3:25 ` suijingfeng
2022-02-03 16:04 ` Sui Jingfeng
2022-02-09 8:49 ` Maxime Ripard
2022-02-09 14:38 ` Sui Jingfeng
2022-02-09 16:16 ` Maxime Ripard
2022-02-12 18:11 ` Sui Jingfeng
2022-02-16 14:08 ` Maxime Ripard
2022-02-12 20:52 ` Ilia Mirkin
2022-02-16 13:34 ` Sui Jingfeng
2022-02-16 14:11 ` Maxime Ripard
2022-02-03 16:29 ` Sui Jingfeng
2022-02-09 8:43 ` Maxime Ripard
2022-02-09 15:41 ` Sui Jingfeng
2022-02-09 16:19 ` Maxime Ripard
2022-02-16 13:46 ` Daniel Stone [this message]
2022-02-16 14:13 ` Sui Jingfeng
2022-02-16 14:43 ` Daniel Stone
2022-02-03 16:41 ` Sui Jingfeng
2022-02-09 8:36 ` Maxime Ripard
2023-02-02 2:58 ` suijingfeng
2022-02-09 12:00 ` [PATCH v6 0/3] " Jiaxun Yang
2022-02-10 4:04 ` Sui Jingfeng
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