From: houlong wei <houlong.wei@mediatek.com>
To: Eizan Miyamoto <eizan@chromium.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Cc: "wenst@chromium.org" <wenst@chromium.org>,
"Yong Wu (吴勇)" <Yong.Wu@mediatek.com>,
"enric.balletbo@collabora.com" <enric.balletbo@collabora.com>,
"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
"chunkuang.hu@kernel.org" <chunkuang.hu@kernel.org>,
"Andrew-CT Chen (陳智迪)" <Andrew-CT.Chen@mediatek.com>,
"Matthias Brugger" <matthias.bgg@gmail.com>,
"Mauro Carvalho Chehab" <mchehab@kernel.org>,
"Minghsiu Tsai (蔡明修)" <Minghsiu.Tsai@mediatek.com>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
"linux-media@vger.kernel.org" <linux-media@vger.kernel.org>,
"linux-mediatek@lists.infradead.org"
<linux-mediatek@lists.infradead.org>,
houlong.wei@mediatek.com
Subject: Re: [PATCH v6 2/9] mtk-mdp: add driver to probe mdp components
Date: Mon, 16 Aug 2021 09:05:54 +0800 [thread overview]
Message-ID: <aef8182ffa2142f2c8ed6bda463d3c127530deae.camel@mediatek.com> (raw)
In-Reply-To: <20210802220943.v6.2.Ie6d1e6e39cf9b5d6b2108ae1096af34c3d55880b@changeid>
On Mon, 2021-08-02 at 20:12 +0800, Eizan Miyamoto wrote:
> Broadly, this patch (1) adds a driver for various MTK MDP components
> to
> go alongside the main MTK MDP driver, and (2) hooks them all together
> using the component framework.
>
> (1) Up until now, the MTK MDP driver controls 8 devices in the device
> tree on its own. When running tests for the hardware video decoder,
> we
> found that the iommus and LARBs were not being properly configured.
> To
> configure them, a driver for each be added to mtk_mdp_comp so that
> mtk_iommu_add_device() can (eventually) be called from
> dma_configure()
> inside really_probe().
>
> (2) The integration into the component framework allows us to defer
> the
> registration with the v4l2 subsystem until all the MDP-related
> devices
> have been probed, so that the relevant device node does not become
> available until initialization of all the components is complete.
>
> Some notes about how the component framework has been integrated:
>
> - The driver for the rdma0 component serves double duty as the
> "master"
> (aggregate) driver as well as a component driver. This is a non-
> ideal
> compromise until a better solution is developed. This device is
> differentiated from the rest by checking for a "mediatek,vpu"
> property
> in the device node.
>
> - The list of mdp components remains hard-coded as
> mtk_mdp_comp_dt_ids[]
> in mtk_mdp_core.c, and as mtk_mdp_comp_driver_dt_match[] in
> mtk_mdp_comp.c. This unfortunate duplication of information is
> addressed in a following patch in this series.
>
> - The component driver calls component_add() for each device that is
> probed.
>
> - In mtk_mdp_probe (the "master" device), we scan the device tree for
> any matching nodes against mtk_mdp_comp_dt_ids, and add component
> matches for them. The match criteria is a matching device node
> pointer.
>
> - When the set of components devices that have been probed
> corresponds
> with the list that is generated by the "master", the callback to
> mtk_mdp_master_bind() is made, which then calls the component bind
> functions.
>
> - Inside mtk_mdp_master_bind(), once all the component bind functions
> have been called, we can then register our device to the v4l2
> subsystem.
>
> - The call to pm_runtime_enable() in the master device is called
> after
> all the components have been registered by their bind() functions
> called by mtk_mtp_master_bind(). As a result, the list of
> components
> will not change while power management callbacks mtk_mdp_suspend()/
> resume() are accessing the list of components.
>
> Signed-off-by: Eizan Miyamoto <eizan@chromium.org>
> ---
>
Reviewed-by: Houlong Wei <houlong.wei@mediatek.com>
> (no changes since v1)
>
[...]
next prev parent reply other threads:[~2021-08-16 1:06 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-02 12:12 [PATCH v6 0/9] Refactor MTK MDP driver into core/components Eizan Miyamoto
2021-08-02 12:12 ` [PATCH v6 1/9] mtk-mdp: propagate errors from clock_on Eizan Miyamoto
2021-08-03 10:26 ` Enric Balletbo Serra
2021-08-05 6:06 ` Dafna Hirschfeld
2021-08-09 3:23 ` Eizan Miyamoto
2021-08-09 7:42 ` Dafna Hirschfeld
2021-08-16 0:46 ` houlong wei
2021-08-02 12:12 ` [PATCH v6 2/9] mtk-mdp: add driver to probe mdp components Eizan Miyamoto
2021-08-03 10:26 ` Enric Balletbo Serra
2021-08-05 6:40 ` Dafna Hirschfeld
2021-08-09 3:23 ` Eizan Miyamoto
2021-08-09 7:53 ` Dafna Hirschfeld
2021-08-11 11:15 ` Eizan Miyamoto
2021-08-16 1:05 ` houlong wei [this message]
2021-08-02 12:12 ` [PATCH v6 3/9] mtk-mdp: use pm_runtime in MDP component driver Eizan Miyamoto
2021-08-03 10:26 ` Enric Balletbo Serra
2021-08-16 1:07 ` houlong wei
2021-08-02 12:12 ` [PATCH v6 4/9] media: mtk-mdp: don't pm_run_time_get/put for master comp in clock_on Eizan Miyamoto
2021-08-03 10:27 ` Enric Balletbo Serra
2021-08-16 1:10 ` houlong wei
2021-08-02 12:12 ` [PATCH v6 5/9] mtk-mdp: make mdp driver to be loadable by platform_device_register*() Eizan Miyamoto
2021-08-03 10:27 ` Enric Balletbo Serra
2021-08-16 1:15 ` houlong wei
2021-08-16 3:37 ` houlong wei
2021-08-02 12:12 ` [PATCH v6 6/9] soc: mediatek: mmsys: instantiate mdp virtual device from mmsys Eizan Miyamoto
2021-08-03 10:27 ` Enric Balletbo Serra
2021-08-16 1:18 ` houlong wei
2021-08-02 12:12 ` [PATCH v6 7/9] media: mtk-mdp: use mdp-rdma0 alias to point to MDP master Eizan Miyamoto
2021-08-03 10:27 ` Enric Balletbo Serra
2021-08-03 11:46 ` Eizan Miyamoto
2021-08-16 3:00 ` houlong wei
2021-08-16 4:52 ` houlong wei
2021-08-18 7:50 ` Eizan Miyamoto
2021-08-18 15:42 ` houlong wei
2021-08-18 7:43 ` Eizan Miyamoto
2021-08-18 15:34 ` houlong wei
2021-08-02 12:12 ` [PATCH v6 8/9] dts: mtk-mdp: remove mediatek,vpu property from primary MDP device Eizan Miyamoto
2021-08-03 10:27 ` Enric Balletbo Serra
2021-08-02 12:12 ` [PATCH v6 9/9] dt-bindings: mediatek: remove vpu requirement from mtk-mdp Eizan Miyamoto
2021-08-03 10:27 ` Enric Balletbo Serra
2021-08-06 21:47 ` Rob Herring
2021-08-03 10:29 ` [PATCH v6 0/9] Refactor MTK MDP driver into core/components Enric Balletbo Serra
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