From: Daniel Vetter <daniel@ffwll.ch>
To: Kishon Vijay Abraham I <kishon@ti.com>
Cc: Maxime Ripard <maxime.ripard@bootlin.com>,
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
Date: Tue, 5 Feb 2019 09:46:20 +0100 [thread overview]
Message-ID: <20190205084620.GW3271@phenom.ffwll.local> (raw)
In-Reply-To: <fc5427d3-674e-cebc-99b9-11493f976a20@ti.com>
On Mon, Feb 04, 2019 at 03:33:31PM +0530, Kishon Vijay Abraham I wrote:
>
>
> On 21/01/19 9:15 PM, Maxime Ripard wrote:
> > Hi,
> >
> > Here is a set of patches to allow the phy framework consumers to test and
> > apply runtime configurations.
> >
> > This is needed to support more phy classes that require tuning based on
> > parameters depending on the current use case of the device, in addition to
> > the power state management already provided by the current functions.
> >
> > 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 quite
> > 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 implementation.
> >
> > 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 two of
> > them: the above mentionned Cadence DSI driver so that the v4l2 drivers can
> > use them, and the Allwinner MIPI-DSI driver.
>
> Can the PHY changes go independently of the consumer drivers? or else I'll need
> ACKs from the GPU MAINTAINER.
Maxime is a gpu maintainer, so you're all good :-)
-Daniel
>
> Thanks
> Kishon
>
> >
> > Let me know what you think,
> > Maxime
> >
> > Changes from v4:
> > - Removed regression on the variable calculation
> > - Fixed the wakeup unit
> > - Collected Sean Acked-by on the last patch
> > - Collected Sakari Reviewed-by on the first patch
> >
> > Changes from v3
> > - Rebased on 5.0-rc1
> > - Added the fixes suggested by Sakari
> >
> > Changes from v2:
> > - Rebased on next
> > - Changed the interface to accomodate for the new submodes
> > - Changed the timings units from nanoseconds to picoseconds
> > - Added minimum and maximum boundaries to the documentation
> > - Moved the clock enabling to phy_power_on in the Cadence DPHY driver
> > - Exported the phy_configure and phy_validate symbols
> > - Rework the phy pll divider computation in the cadence dphy driver
> >
> > Changes from v1:
> > - Rebased on top of 4.20-rc1
> > - Removed the bus mode and timings parameters from the MIPI D-PHY
> > parameters, since that shouldn't have any impact on the PHY itself.
> > - Reworked the Cadence DSI and D-PHY drivers to take this into account.
> > - Remove the mode parameter from phy_configure
> > - Added phy_configure and phy_validate stubs
> > - Return -EOPNOTSUPP in phy_configure and phy_validate when the operation
> > is not implemented
> >
> > Maxime Ripard (9):
> > phy: dphy: Remove unused header
> > phy: dphy: Change units of wakeup and init parameters
> > phy: dphy: Clarify lanes parameter documentation
> > sun6i: dsi: Convert to generic phy handling
> > phy: Move Allwinner A31 D-PHY driver to drivers/phy/
> > drm/bridge: cdns: Separate DSI and D-PHY configuration
> > dt-bindings: phy: Move the Cadence D-PHY bindings
> > phy: Add Cadence D-PHY support
> > drm/bridge: cdns: Convert to phy framework
> >
> > Documentation/devicetree/bindings/display/bridge/cdns,dsi.txt | 21 +-
> > Documentation/devicetree/bindings/phy/cdns,dphy.txt | 20 +-
> > drivers/gpu/drm/bridge/Kconfig | 1 +-
> > drivers/gpu/drm/bridge/cdns-dsi.c | 538 +------
> > drivers/gpu/drm/sun4i/Kconfig | 3 +-
> > drivers/gpu/drm/sun4i/Makefile | 5 +-
> > drivers/gpu/drm/sun4i/sun6i_mipi_dphy.c | 292 +----
> > drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c | 31 +-
> > drivers/gpu/drm/sun4i/sun6i_mipi_dsi.h | 17 +-
> > drivers/phy/allwinner/Kconfig | 12 +-
> > drivers/phy/allwinner/Makefile | 1 +-
> > drivers/phy/allwinner/phy-sun6i-mipi-dphy.c | 318 ++++-
> > drivers/phy/cadence/Kconfig | 13 +-
> > drivers/phy/cadence/Makefile | 1 +-
> > drivers/phy/cadence/cdns-dphy.c | 389 +++++-
> > drivers/phy/phy-core-mipi-dphy.c | 8 +-
> > include/linux/phy/phy-mipi-dphy.h | 13 +-
> > 17 files changed, 894 insertions(+), 789 deletions(-)
> > create mode 100644 Documentation/devicetree/bindings/phy/cdns,dphy.txt
> > delete mode 100644 drivers/gpu/drm/sun4i/sun6i_mipi_dphy.c
> > create mode 100644 drivers/phy/allwinner/phy-sun6i-mipi-dphy.c
> > create mode 100644 drivers/phy/cadence/cdns-dphy.c
> >
> > base-commit: bfeffd155283772bbe78c6a05dec7c0128ee500c
> >
> _______________________________________________
> dri-devel mailing list
> dri-devel@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
next prev parent reply other threads:[~2019-02-05 8:46 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-21 15:45 [PATCH v5 0/9] phy: Add configuration interface for MIPI D-PHY devices Maxime Ripard
2019-01-21 15:45 ` [PATCH v5 1/9] phy: dphy: Remove unused header Maxime Ripard
2019-01-21 15:45 ` [PATCH v5 2/9] phy: dphy: Change units of wakeup and init parameters Maxime Ripard
2019-01-21 15:45 ` [PATCH v5 3/9] phy: dphy: Clarify lanes parameter documentation Maxime Ripard
2019-01-21 15:45 ` [PATCH v5 4/9] sun6i: dsi: Convert to generic phy handling Maxime Ripard
2019-02-07 8:15 ` Paul Kocialkowski
2019-01-21 15:45 ` [PATCH v5 5/9] phy: Move Allwinner A31 D-PHY driver to drivers/phy/ Maxime Ripard
2019-02-07 8:19 ` Paul Kocialkowski
2019-01-21 15:45 ` [PATCH v5 6/9] drm/bridge: cdns: Separate DSI and D-PHY configuration Maxime Ripard
2019-02-07 8:44 ` Paul Kocialkowski
2019-02-07 9:16 ` Maxime Ripard
2019-01-21 15:45 ` [PATCH v5 7/9] dt-bindings: phy: Move the Cadence D-PHY bindings Maxime Ripard
2019-01-21 15:45 ` [PATCH v5 8/9] phy: Add Cadence D-PHY support Maxime Ripard
2019-01-21 15:45 ` [PATCH v5 9/9] drm/bridge: cdns: Convert to phy framework Maxime Ripard
2019-02-04 10:03 ` [PATCH v5 0/9] phy: Add configuration interface for MIPI D-PHY devices Kishon Vijay Abraham I
2019-02-04 13:51 ` Maxime Ripard
2019-02-05 8:46 ` Daniel Vetter [this message]
2019-02-06 12:13 ` Kishon Vijay Abraham I
2019-02-06 12:25 ` Maxime Ripard
2019-02-06 12:30 ` Kishon Vijay Abraham I
2019-02-07 9:17 ` Maxime Ripard
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