lkml.org 
[lkml]   [2017]   [May]   [29]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH v7 00/34] i.MX Media Driver
From
Date
On 05/29/2017 05:36 PM, Sakari Ailus wrote:
> Hi Hans,
>
> On Mon, May 29, 2017 at 03:46:08PM +0200, Hans Verkuil wrote:
>> Hi Steve,
>>
>> On 05/25/2017 02:29 AM, Steve Longerbeam wrote:
>>> In version 7:
>>>
>>> - video-mux: switched to Philipp's latest video-mux driver and updated
>>> bindings docs, that makes use of the mmio-mux framework.
>>>
>>> - mmio-mux: includes Philipp's temporary patch that adds mmio-mux support
>>> to video-mux driver, until mux framework is merged.
>>>
>>> - mmio-mux: updates to device tree from Philipp that define the i.MX6 mux
>>> devices and modifies the video-mux device to become a consumer of the
>>> video mmio-mux.
>>>
>>> - minor updates to Documentation/media/v4l-drivers/imx.rst.
>>>
>>> - ov5640: do nothing if entity stream count is greater than 1 in
>>> ov5640_s_stream().
>>>
>>> - Previous versions of this driver had not tested the ability to enable
>>> multiple independent streams, for instance enabling multiple output
>>> pads from the imx6-mipi-csi2 subdevice, or enabling both prpenc and
>>> prpvf outputs. Marek Vasut tested this support and reported issues
>>> with it.
>>>
>>> v4l2_pipeline_inherit_controls() used the media graph walk APIs, but
>>> that walks both sink and source pads, so if there are multiple paths
>>> enabled to video capture devices, controls would be added to the wrong
>>> video capture device, and no controls added to the other enabled
>>> capture devices.
>>>
>>> These issues have been fixed. Control inheritance works correctly now
>>> even with multiple enabled capture paths, and (for example)
>>> simultaneous capture from prpenc and prpvf works also, and each with
>>> independent scaling, CSC, and controls. For example prpenc can be
>>> capturing with a 90 degree rotation, while prpvf is capturing with
>>> vertical flip.
>>>
>>> So the v4l2_pipeline_inherit_controls() patch has been dropped. The
>>> new version of control inheritance could be made generically available,
>>> but it would be more involved to incorporate it into v4l2-core.
>>>
>>> - A new function imx_media_fill_default_mbus_fields() is added to setup
>>> colorimetry at sink pads, and these are propagated to source pads.
>>>
>>> - Ensure that the current sink and source rectangles meet alignment
>>> restrictions before applying a new rotation control setting in
>>> prp-enc/vf subdevices.
>>>
>>> - Chain the s_stream() subdev calls instead of implementing a custom
>>> stream on/off function that attempts to call a fixed set of subdevices
>>> in a pipeline in the correct order. This also simplifies imx6-mipi-csi2
>>> subdevice, since the correct MIPI CSI-2 startup sequence can be
>>> enforced completely in s_stream(), and s_power() is no longer
>>> required. This also paves the way for more arbitrary OF graphs
>>> external to the i.MX6.
>>>
>>> - Converted the v4l2_subdev and media_entity ops structures to const.
>>
>> What is the status as of v7?
>>
>> From what I can tell patch 2/34 needs an Ack from Rob Herring, patches
>> 4-14 are out of scope for the media subsystem, patches 20-25 and 27-34
>> are all staging (so fine to be merged from my point of view).
>>
>> I'm not sure if patch 26 (defconfig) should be applied while the imx
>> driver is in staging. I would suggest that this patch is moved to the end
>> of the series.
>>
>> That leaves patches 15-19. I replied to patch 15 with a comment, patches
>> 16-18 look good to me, although patches 17 and 18 should be combined to one
>> patch since patch 17 won't compile otherwise. Any idea when the multiplexer is
>> expected to be merged? (just curious)
>>
>> I would really like to get this merged for 4.13, so did I miss anything?
>> From what I can tell it is really just an Ack for patch 2/34.
>
> The patchset re-initialises the control handler in the video node in its
> media device link_setup callback, among other things. I don't think that
> this as such should prevent including the driver in staging, but at the same
> time my concern is what kind of guarantees can we give in terms of V4L2
> framework support on things like this using the current API. I'd say "none".
>
> If there's a need for this (there should not be, as the controls are exposed
> to the user space through the sub-device nodes as the other drivers do), the
> framework APIs need to be extended.
>
> I think it'd be good to add a TODO file (such as the one in OMAP4ISS) as
> part of the patchset that would include a list of things left to do so
> they're not forgotten.
>

A TODO file, that's a very good point. Yes, we need that.

Regards,

Hans

\
 
 \ /
  Last update: 2017-05-29 18:30    [W:0.101 / U:0.076 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site