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Date:   Thu, 7 Feb 2019 10:17:14 +0100
From:   Maxime Ripard <maxime.ripard@bootlin.com>
To:     Kishon Vijay Abraham I <kishon@ti.com>
Cc:     Rafal Ciepiela <rafalc@cadence.com>,
        Krzysztof Witos <kwitos@cadence.com>,
        linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org,
        Chen-Yu Tsai <wens@csie.org>,
        Sean Paul <seanpaul@chromium.org>,
        Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
        Thomas Petazzoni <thomas.petazzoni@bootlin.com>,
        linux-arm-kernel@lists.infradead.org, linux-media@vger.kernel.org
Subject: Re: [PATCH v5 0/9] phy: Add configuration interface for MIPI D-PHY
 devices
Message-ID: <20190207091714.2rhdprl56pz32nbo@flea>
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Hi Kishon,

On Wed, Feb 06, 2019 at 06:00:19PM +0530, Kishon Vijay Abraham I wrote:
> On 06/02/19 5:55 PM, Maxime Ripard wrote:
> > On Wed, Feb 06, 2019 at 05:43:12PM +0530, Kishon Vijay Abraham I wrote:
> >> On 05/02/19 2:16 PM, Daniel Vetter wrote:
> >>> On Mon, Feb 04, 2019 at 03:33:31PM +0530, Kishon Vijay Abraham I wrot=
e:
> >>>>
> >>>>
> >>>> On 21/01/19 9:15 PM, Maxime Ripard wrote:
> >>>>> Hi,
> >>>>>
> >>>>> Here is a set of patches to allow the phy framework consumers to te=
st and
> >>>>> apply runtime configurations.
> >>>>>
> >>>>> This is needed to support more phy classes that require tuning base=
d on
> >>>>> parameters depending on the current use case of the device, in addi=
tion to
> >>>>> the power state management already provided by the current function=
s.
> >>>>>
> >>>>> A first test bed for that API are the MIPI D-PHY devices. There's a=
 number
> >>>>> of solutions that have been used so far to support these phy, most =
of the
> >>>>> time being an ad-hoc driver in the consumer.
> >>>>>
> >>>>> That approach has a big shortcoming though, which is that this is q=
uite
> >>>>> difficult to deal with consumers integrated with multiple variants =
of phy,
> >>>>> of multiple consumers integrated with the same phy.
> >>>>>
> >>>>> The latter case can be found in the Cadence DSI bridge, and the CSI
> >>>>> transceiver and receivers. All of them are integrated with the same=
 phy, or
> >>>>> can be integrated with different phy, depending on the implementati=
on.
> >>>>>
> >>>>> I've looked at all the MIPI DSI drivers I could find, and gathered =
all the
> >>>>> parameters I could find. The interface should be complete, and most=
 of the
> >>>>> drivers can be converted in the future. The current set converts tw=
o of
> >>>>> them: the above mentionned Cadence DSI driver so that the v4l2 driv=
ers can
> >>>>> use them, and the Allwinner MIPI-DSI driver.
> >>>>
> >>>> Can the PHY changes go independently of the consumer drivers? or els=
e I'll need
> >>>> ACKs from the GPU MAINTAINER.
> >>>
> >>> Maxime is a gpu maintainer, so you're all good :-)
> >>
> >> cool.. I've merged all the patches except drm/bridge.
> >>
> >> Please see if everything looks okay once it shows up in phy -next (giv=
e a day)
> >=20
> > Thanks!
> >=20
> > If possible (and if that's still an option), it would be better if the
> > sun6i related patches (patches 4 and 5) would go through the DRM tree
> > (with your Acked-by of course).
> >=20
> > We have a number of patches in flight that have a decent chance to
> > conflict with patch 4.
>=20
> Sure. Dropped patches 4 and 5 from my tree.

Thanks! I've pushed the rest into drm-misc.

Maxime

--=20
Maxime Ripard, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com

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