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Date: Mon, 27 May 2019 12:18:53 +0200
From: Neil Armstrong <narmstrong@...libre.com>
To: Hans Verkuil <hverkuil@...all.nl>,
Maxime Jourdan <mjourdan@...libre.com>,
Mauro Carvalho Chehab <mchehab@...nel.org>
Cc: Hans Verkuil <hans.verkuil@...co.com>,
Kevin Hilman <khilman@...libre.com>,
Jerome Brunet <jbrunet@...libre.com>,
Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org,
linux-amlogic@...ts.infradead.org
Subject: Re: [PATCH v6 3/4] media: meson: add v4l2 m2m video decoder driver
Hi Hans,
On 27/05/2019 12:04, Hans Verkuil wrote:
> Hi Maxime,
>
> First a high-level comment: I think this driver should go to staging.
> Once we finalize the stateful decoder spec, and we've updated the
> v4l2-compliance test, then this needs to be tested against that and
> only if it passes can it be moved out of staging.
I don't understand the reason since other stateful codecs are already
mainline and doesn't match the in-discussion stateful decoder spec either.
Neil
>
> It is just a bit too soon to have this in mainline at this time.
>
> One other comment below:
>
> On 5/14/19 3:56 PM, Maxime Jourdan wrote:
>> Amlogic SoCs feature a powerful video decoder unit able to
>> decode many formats, with a performance of usually up to 4k60.
>>
>> This is a driver for this IP that is based around the v4l2 m2m framework.
>>
>> It features decoding for:
>> - MPEG 1
>> - MPEG 2
>>
>> Supported SoCs are: GXBB (S905), GXL (S905X/W/D), GXM (S912)
>>
>> There is also a hardware bitstream parser (ESPARSER) that is handled here.
>>
>> Tested-by: Neil Armstrong <narmstrong@...libre.com>
>> Signed-off-by: Maxime Jourdan <mjourdan@...libre.com>
>> ---
>> drivers/media/platform/Kconfig | 10 +
>> drivers/media/platform/meson/Makefile | 1 +
>> drivers/media/platform/meson/vdec/Makefile | 8 +
>> .../media/platform/meson/vdec/codec_mpeg12.c | 209 ++++
>> .../media/platform/meson/vdec/codec_mpeg12.h | 14 +
>> drivers/media/platform/meson/vdec/dos_regs.h | 98 ++
>> drivers/media/platform/meson/vdec/esparser.c | 323 +++++
>> drivers/media/platform/meson/vdec/esparser.h | 32 +
>> drivers/media/platform/meson/vdec/vdec.c | 1071 +++++++++++++++++
>> drivers/media/platform/meson/vdec/vdec.h | 265 ++++
>> drivers/media/platform/meson/vdec/vdec_1.c | 229 ++++
>> drivers/media/platform/meson/vdec/vdec_1.h | 14 +
>> .../media/platform/meson/vdec/vdec_ctrls.c | 51 +
>> .../media/platform/meson/vdec/vdec_ctrls.h | 14 +
>> .../media/platform/meson/vdec/vdec_helpers.c | 441 +++++++
>> .../media/platform/meson/vdec/vdec_helpers.h | 80 ++
>> .../media/platform/meson/vdec/vdec_platform.c | 107 ++
>> .../media/platform/meson/vdec/vdec_platform.h | 30 +
>> 18 files changed, 2997 insertions(+)
>> create mode 100644 drivers/media/platform/meson/vdec/Makefile
>> create mode 100644 drivers/media/platform/meson/vdec/codec_mpeg12.c
>> create mode 100644 drivers/media/platform/meson/vdec/codec_mpeg12.h
>> create mode 100644 drivers/media/platform/meson/vdec/dos_regs.h
>> create mode 100644 drivers/media/platform/meson/vdec/esparser.c
>> create mode 100644 drivers/media/platform/meson/vdec/esparser.h
>> create mode 100644 drivers/media/platform/meson/vdec/vdec.c
>> create mode 100644 drivers/media/platform/meson/vdec/vdec.h
>> create mode 100644 drivers/media/platform/meson/vdec/vdec_1.c
>> create mode 100644 drivers/media/platform/meson/vdec/vdec_1.h
>> create mode 100644 drivers/media/platform/meson/vdec/vdec_ctrls.c
>> create mode 100644 drivers/media/platform/meson/vdec/vdec_ctrls.h
>> create mode 100644 drivers/media/platform/meson/vdec/vdec_helpers.c
>> create mode 100644 drivers/media/platform/meson/vdec/vdec_helpers.h
>> create mode 100644 drivers/media/platform/meson/vdec/vdec_platform.c
>> create mode 100644 drivers/media/platform/meson/vdec/vdec_platform.h
>>
>
> <snip>
>
>> diff --git a/drivers/media/platform/meson/vdec/vdec_ctrls.c b/drivers/media/platform/meson/vdec/vdec_ctrls.c
>> new file mode 100644
>> index 000000000000..d5d6b1b97aa5
>> --- /dev/null
>> +++ b/drivers/media/platform/meson/vdec/vdec_ctrls.c
>> @@ -0,0 +1,51 @@
>> +// SPDX-License-Identifier: GPL-2.0+
>> +/*
>> + * Copyright (C) 2018 BayLibre, SAS
>> + * Author: Maxime Jourdan <mjourdan@...libre.com>
>> + */
>> +
>> +#include "vdec_ctrls.h"
>> +
>> +static int vdec_op_g_volatile_ctrl(struct v4l2_ctrl *ctrl)
>> +{
>> + struct amvdec_session *sess =
>> + container_of(ctrl->handler, struct amvdec_session, ctrl_handler);
>> +
>> + switch (ctrl->id) {
>> + case V4L2_CID_MIN_BUFFERS_FOR_CAPTURE:
>> + ctrl->val = sess->dpb_size;
>> + break;
>> + default:
>> + return -EINVAL;
>> + };
>> +
>> + return 0;
>> +}
>> +
>> +static const struct v4l2_ctrl_ops vdec_ctrl_ops = {
>> + .g_volatile_ctrl = vdec_op_g_volatile_ctrl,
>> +};
>> +
>> +int amvdec_init_ctrls(struct v4l2_ctrl_handler *ctrl_handler)
>> +{
>> + int ret;
>> + struct v4l2_ctrl *ctrl;
>> +
>> + ret = v4l2_ctrl_handler_init(ctrl_handler, 1);
>> + if (ret)
>> + return ret;
>> +
>> + ctrl = v4l2_ctrl_new_std(ctrl_handler, &vdec_ctrl_ops,
>> + V4L2_CID_MIN_BUFFERS_FOR_CAPTURE, 1, 32, 1, 1);
>> + if (ctrl)
>> + ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE;
>
> Why is this volatile? That makes little sense.
>
>> +
>> + ret = ctrl_handler->error;
>> + if (ret) {
>> + v4l2_ctrl_handler_free(ctrl_handler);
>> + return ret;
>> + }
>> +
>> + return 0;
>> +}
>> +EXPORT_SYMBOL_GPL(amvdec_init_ctrls);
>
> <snip>
>
> Regards,
>
> Hans
>
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