From: Luca Ceresoli <luca@lucaceresoli.net>
To: Vishal Sagar <vishal.sagar@xilinx.com>,
hyun.kwon@xilinx.com, laurent.pinchart@ideasonboard.com,
mchehab@kernel.org, robh+dt@kernel.org, mark.rutland@arm.com,
michals@xilinx.com, linux-media@vger.kernel.org,
devicetree@vger.kernel.org, sakari.ailus@linux.intel.com,
hans.verkuil@cisco.com, linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, dineshk@xilinx.com,
sandipk@xilinx.com
Subject: Re: [PATCH v3 2/2] media: v4l: xilinx: Add Xilinx MIPI CSI-2 Rx Subsystem
Date: Mon, 11 Feb 2019 11:42:24 +0100 [thread overview]
Message-ID: <3923069f-7c69-c601-0ded-f7629696ef9b@lucaceresoli.net> (raw)
In-Reply-To: <1549025766-135037-3-git-send-email-vishal.sagar@xilinx.com>
Hi Vishal,
On 01/02/19 13:56, Vishal Sagar wrote:
> The Xilinx MIPI CSI-2 Rx Subsystem soft IP is used to capture images
> from MIPI CSI-2 camera sensors and output AXI4-Stream video data ready
> for image processing. Please refer to PG232 for details.
For those unused to Xilinx documentation I'd use the full document name
("MIPI CSI-2 Receiver Subsystem v4.0") or, even better, a stable URL if
available.
> The driver is used to set the number of active lanes, if enabled
> in hardware. The CSI2 Rx controller filters out all packets except for
> the packets with data type fixed in hardware. RAW8 packets are always
> allowed to pass through.
>
> It is also used to setup and handle interrupts and enable the core. It
> logs all the events in respective counters between streaming on and off.
> The generic short packets received are notified to application via
> v4l2_events.
>
> The driver supports only the video format bridge enabled configuration.
> Some data types like YUV 422 10bpc, RAW16, RAW20 are supported when the
> CSI v2.0 feature is enabled in design. When the VCX feature is enabled,
> the maximum number of virtual channels becomes 16 from 4.
>
> Signed-off-by: Vishal Sagar <vishal.sagar@xilinx.com>
...
> +/**
> + * xcsi2rxss_reset - Does a soft reset of the MIPI CSI2 Rx Subsystem
> + * @core: Core Xilinx CSI2 Rx Subsystem structure pointer
> + *
> + * Core takes less than 100 video clock cycles to reset.
> + * So a larger timeout value is chosen for margin.
> + *
> + * Return: 0 - on success OR -ETIME if reset times out
> + */
> +static int xcsi2rxss_reset(struct xcsi2rxss_core *core)
> +{
> + u32 timeout = XCSI_TIMEOUT_VAL;
The comment about the timeout is duplicated here and at the #define
line. Why not removing the define above and just putting
u32 timeout = 1000; /* us */
here? It would make the entire timeout logic appear in a unique place.
> +static int xcsi2rxss_start_stream(struct xcsi2rxss_state *state)
> +{
> + struct xcsi2rxss_core *core = &state->core;
> + int ret = 0;
> +
> + xcsi2rxss_enable(core);
> +
> + ret = xcsi2rxss_reset(core);
> + if (ret < 0) {
> + state->streaming = false;
> + return ret;
> + }
> +
> + xcsi2rxss_intr_enable(core);
> + state->streaming = true;
Shouldn't you propagate s_stream to the upstream subdev here calling
v4l2_subdev_call(..., ..., s_stream, 1)?
> + return ret;
> +}
--
Luca
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2019-02-11 11:09 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-01 12:56 [PATCH v3 0/2] Add support for Xilinx CSI2 Receiver Subsystem Vishal Sagar
2019-02-01 12:56 ` [PATCH v3 1/2] media: dt-bindings: media: xilinx: Add Xilinx MIPI CSI-2 Rx Subsystem Vishal Sagar
2019-02-11 10:42 ` Luca Ceresoli
2019-03-08 19:04 ` Vishal Sagar
2019-03-11 12:08 ` Luca Ceresoli
2019-03-12 4:36 ` Vishal Sagar
2019-02-01 12:56 ` [PATCH v3 2/2] media: v4l: " Vishal Sagar
2019-02-11 10:42 ` Luca Ceresoli [this message]
2019-02-11 12:43 ` Vishal Sagar
2019-02-11 14:30 ` Luca Ceresoli
2019-02-22 12:05 ` Vishal Sagar
2019-02-13 19:45 ` [v3,2/2] " Hyun Kwon
2019-02-22 12:06 ` Vishal Sagar
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=3923069f-7c69-c601-0ded-f7629696ef9b@lucaceresoli.net \
--to=luca@lucaceresoli.net \
--cc=devicetree@vger.kernel.org \
--cc=dineshk@xilinx.com \
--cc=hans.verkuil@cisco.com \
--cc=hyun.kwon@xilinx.com \
--cc=laurent.pinchart@ideasonboard.com \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-media@vger.kernel.org \
--cc=mark.rutland@arm.com \
--cc=mchehab@kernel.org \
--cc=michals@xilinx.com \
--cc=robh+dt@kernel.org \
--cc=sakari.ailus@linux.intel.com \
--cc=sandipk@xilinx.com \
--cc=vishal.sagar@xilinx.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).