linux-kernel - Re: [RFC PATCH 2/2] drm: xlnx: driver for Xilinx DSI TX Subsystem

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Date:   Sun, 7 Jun 2020 05:25:18 +0300
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Venkateshwar Rao Gannavarapu <VGANNAVA@...inx.com>
Cc:     Hyun Kwon <hyunk@...inx.com>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "airlied@...ux.ie" <airlied@...ux.ie>,
        "daniel@...ll.ch" <daniel@...ll.ch>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Sandip Kothari <sandipk@...inx.com>
Subject: Re: [RFC PATCH 2/2] drm: xlnx: driver for Xilinx DSI TX Subsystem

Hi GVRao,

On Sun, May 31, 2020 at 05:41:50PM +0000, Venkateshwar Rao Gannavarapu wrote:
> On Sunday, May 24, 2020 8:38 AM, Laurent Pinchart wrote:
> > On Mon, May 04, 2020 at 11:43:48AM -0700, Hyun Kwon wrote:
> >> On Mon, 2020-04-20 at 14:20:56 -0700, Venkateshwar Rao Gannavarapu wrote:
> >>> The Xilinx MIPI DSI Tx Subsystem soft IP is used to display video
> >>> data from AXI-4 stream interface.
> >>>
> >>> It supports upto 4 lanes, optional register interface for the DPHY,
> >>
> >> I don't see the register interface for dphy support.
> >
> > I think the D-PHY should be supported through a PHY driver, as it seems to be
> > shared between different subsystems.
>
> IP has the provision to read DPHY register for debug purpose only.
> No programming of DPHY is required in subsystem.

Do you know if this is the same D-PHY as used in the CSI2-RX subsystem ?

> >>> multiple RGB color formats, command mode and video mode.
> >>> This is a MIPI-DSI host driver and provides DSI bus for panels.
> >>> This driver also helps to communicate with its panel using panel
> >>> framework.
> >>>
> >>> Signed-off-by: Venkateshwar Rao Gannavarapu <venkateshwar.rao.gannavarapu@...inx.com>
> >>> ---
> >>>  drivers/gpu/drm/xlnx/Kconfig    |  11 +
> >>>  drivers/gpu/drm/xlnx/Makefile   |   2 +
> >>>  drivers/gpu/drm/xlnx/xlnx_dsi.c | 755 ++++++++++++++++++++++++++++++++++++++++
> >
> > Daniel Vetter has recently expressed his opiion that bridge drivers should go to
> > drivers/gpu/drm/bridge/. It would then be drivers/gpu/drm/bridge/xlnx/. I don't
> > have a strong opinion myself.
> >
> >>>  3 files changed, 768 insertions(+)
> >>>  create mode 100644 drivers/gpu/drm/xlnx/xlnx_dsi.c

[snip]

-- 
Regards,

Laurent Pinchart