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 14:43:34 +0000 [thread overview]
Message-ID: <CAPj87rOY0j7p5fduA+p-kT8HP7kc8f4j2Q=FkGutPPPvmV7zqQ@mail.gmail.com> (raw)
In-Reply-To: <adec818a-5c66-3b4a-6f27-bcb29b6c67d1@189.cn>
On Wed, 16 Feb 2022 at 14:13, Sui Jingfeng <15330273260@189.cn> wrote:
> On 2022/2/16 21:46, Daniel Stone wrote:
> > 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.
>
> When using vram helper based driver, the framebuffer is locate at video
> ram. the backing memory fb is manage by TTM.
>
> while bo of etnaviv is locate at system ram. Currently i can't figure
> out how does the buffer going to be shared.
kmsro will allocate from the KMS device (usually using dumb buffers),
export that BO as a dmabuf, then import into etnaviv. etnaviv already
uses this for imx-drm.
Cheers,
Daniel
WARNING: multiple messages have this Message-ID (diff)
From: Daniel Stone <daniel@fooishbar.org>
To: Sui Jingfeng <15330273260@189.cn>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
suijingfeng <suijingfeng@loongson.cn>,
David Airlie <airlied@linux.ie>,
Randy Dunlap <rdunlap@infradead.org>,
Roland Scheidegger <sroland@vmware.com>,
linux-mips@vger.kernel.org, dri-devel@lists.freedesktop.org,
linux-kernel@vger.kernel.org,
Andrey Zhizhikin <andrey.zhizhikin@leica-geosystems.com>,
Rob Herring <robh+dt@kernel.org>,
Maxime Ripard <maxime@cerno.tech>,
Krzysztof Kozlowski <krzk@kernel.org>,
Sam Ravnborg <sam@ravnborg.org>,
Dan Carpenter <dan.carpenter@oracle.com>
Subject: Re: [PATCH v6 1/3] drm/lsdc: add drm driver for loongson display controller
Date: Wed, 16 Feb 2022 14:43:34 +0000 [thread overview]
Message-ID: <CAPj87rOY0j7p5fduA+p-kT8HP7kc8f4j2Q=FkGutPPPvmV7zqQ@mail.gmail.com> (raw)
In-Reply-To: <adec818a-5c66-3b4a-6f27-bcb29b6c67d1@189.cn>
On Wed, 16 Feb 2022 at 14:13, Sui Jingfeng <15330273260@189.cn> wrote:
> On 2022/2/16 21:46, Daniel Stone wrote:
> > 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.
>
> When using vram helper based driver, the framebuffer is locate at video
> ram. the backing memory fb is manage by TTM.
>
> while bo of etnaviv is locate at system ram. Currently i can't figure
> out how does the buffer going to be shared.
kmsro will allocate from the KMS device (usually using dumb buffers),
export that BO as a dmabuf, then import into etnaviv. etnaviv already
uses this for imx-drm.
Cheers,
Daniel
next prev parent reply other threads:[~2022-02-16 14:43 UTC|newest]
Thread overview: 83+ 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 ` Sui Jingfeng
2022-02-03 8:25 ` [PATCH v6 1/3] " Sui Jingfeng
2022-02-03 8:25 ` Sui Jingfeng
2022-02-03 8:53 ` Krzysztof Kozlowski
2022-02-03 8:53 ` Krzysztof Kozlowski
2022-02-03 11:07 ` Dan Carpenter
2022-02-03 11:07 ` Dan Carpenter
2022-02-03 11:29 ` Krzysztof Kozlowski
2022-02-03 11:29 ` Krzysztof Kozlowski
2022-02-03 13:34 ` Dan Carpenter
2022-02-03 13:34 ` Dan Carpenter
2022-02-03 8:58 ` Maxime Ripard
2022-02-03 8:58 ` Maxime Ripard
2022-02-03 14:14 ` Sui Jingfeng
2022-02-03 15:27 ` Sui Jingfeng
2022-02-03 15:47 ` Sui Jingfeng
2022-02-03 15:47 ` Sui Jingfeng
2022-02-09 8:52 ` Maxime Ripard
2022-02-09 8:52 ` Maxime Ripard
2022-02-09 11:56 ` Jiaxun Yang
2022-02-09 11:56 ` Jiaxun Yang
2022-02-09 14:04 ` Maxime Ripard
2022-02-09 14:04 ` Maxime Ripard
2022-02-09 14:14 ` Jiaxun Yang
2022-02-09 14:14 ` Jiaxun Yang
2023-02-03 3:25 ` suijingfeng
2022-02-03 16:04 ` Sui Jingfeng
2022-02-03 16:04 ` Sui Jingfeng
2022-02-09 8:49 ` Maxime Ripard
2022-02-09 8:49 ` Maxime Ripard
2022-02-09 14:38 ` Sui Jingfeng
2022-02-09 14:38 ` Sui Jingfeng
2022-02-09 16:16 ` Maxime Ripard
2022-02-09 16:16 ` Maxime Ripard
2022-02-12 18:11 ` Sui Jingfeng
2022-02-12 18:11 ` Sui Jingfeng
2022-02-16 14:08 ` Maxime Ripard
2022-02-16 14:08 ` Maxime Ripard
2022-02-12 20:52 ` Ilia Mirkin
2022-02-12 20:52 ` Ilia Mirkin
2022-02-16 13:34 ` Sui Jingfeng
2022-02-16 13:34 ` Sui Jingfeng
2022-02-16 14:11 ` Maxime Ripard
2022-02-16 14:11 ` Maxime Ripard
2022-02-03 16:29 ` Sui Jingfeng
2022-02-03 16:29 ` Sui Jingfeng
2022-02-09 8:43 ` Maxime Ripard
2022-02-09 8:43 ` Maxime Ripard
2022-02-09 15:41 ` Sui Jingfeng
2022-02-09 15:41 ` Sui Jingfeng
2022-02-09 16:19 ` Maxime Ripard
2022-02-09 16:19 ` Maxime Ripard
2022-02-16 13:46 ` Daniel Stone
2022-02-16 13:46 ` Daniel Stone
2022-02-16 14:13 ` Sui Jingfeng
2022-02-16 14:13 ` Sui Jingfeng
2022-02-16 14:43 ` Daniel Stone [this message]
2022-02-16 14:43 ` Daniel Stone
2022-02-03 16:41 ` Sui Jingfeng
2022-02-03 16:41 ` Sui Jingfeng
2022-02-09 8:36 ` Maxime Ripard
2022-02-09 8:36 ` Maxime Ripard
2023-02-02 2:58 ` suijingfeng
2022-02-03 8:25 ` [PATCH v6 2/3] dt-bindings: ls2k1000: add the display controller device node Sui Jingfeng
2022-02-03 8:25 ` Sui Jingfeng
2022-02-03 8:50 ` Krzysztof Kozlowski
2022-02-03 8:50 ` Krzysztof Kozlowski
2022-02-16 14:01 ` Sui Jingfeng
2022-02-16 14:01 ` Sui Jingfeng
2022-02-17 8:38 ` Krzysztof Kozlowski
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 8:25 ` Sui Jingfeng
2022-02-03 8:49 ` Krzysztof Kozlowski
2022-02-03 8:49 ` Krzysztof Kozlowski
2022-02-09 12:00 ` [PATCH v6 0/3] drm/lsdc: add drm driver for loongson display controller Jiaxun Yang
2022-02-09 12:00 ` Jiaxun Yang
2022-02-10 4:04 ` Sui Jingfeng
2022-02-10 4:04 ` Sui Jingfeng
2022-02-06 19:38 [PATCH v6 1/3] " kernel test robot
2022-02-10 23:10 kernel test robot
2022-02-12 5:04 kernel test robot
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