linux-kernel - Re: [PATCH v4 5/5] media: meson: vdec: add VP9 decoder support

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Message-ID: <fed44541-8237-5910-3a69-c6e92e739607@baylibre.com>
Date:   Fri, 14 Feb 2020 16:24:31 +0100
From:   Neil Armstrong <narmstrong@...libre.com>
To:     Hans Verkuil <hverkuil@...all.nl>, mchehab@...nel.org,
        hans.verkuil@...co.com
Cc:     Maxime Jourdan <mjourdan@...libre.com>,
        linux-media@...r.kernel.org, linux-amlogic@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 5/5] media: meson: vdec: add VP9 decoder support

On 14/02/2020 16:04, Hans Verkuil wrote:
> On 2/6/20 9:41 AM, Neil Armstrong wrote:
>> From: Maxime Jourdan <mjourdan@...libre.com>
>>
>> This adds VP9 decoding for the Amlogic GXL, G12A & SM1 SoCs, using
>> the commong "HEVC" HW decoder.
>>
>> For G12A & SM1, it uses the IOMMU support from the firmware.
>>
>> For 10bit decoding, the firmware can only decode in the proprietary
>> Amlogic Framebuffer Compression format, but can output in 8bit NV12
>> buffer while writing the decoded frame.
>>
>> Signed-off-by: Maxime Jourdan <mjourdan@...libre.com>
>> Signed-off-by: Neil Armstrong <narmstrong@...libre.com>
>> ---
>>  drivers/staging/media/meson/vdec/Makefile     |    2 +-
>>  drivers/staging/media/meson/vdec/codec_vp9.c  | 2138 +++++++++++++++++
>>  drivers/staging/media/meson/vdec/codec_vp9.h  |   13 +
>>  drivers/staging/media/meson/vdec/hevc_regs.h  |    7 +
>>  drivers/staging/media/meson/vdec/vdec.c       |    5 +
>>  .../staging/media/meson/vdec/vdec_helpers.c   |    4 +
>>  .../staging/media/meson/vdec/vdec_platform.c  |   38 +
>>  7 files changed, 2206 insertions(+), 1 deletion(-)
>>  create mode 100644 drivers/staging/media/meson/vdec/codec_vp9.c
>>  create mode 100644 drivers/staging/media/meson/vdec/codec_vp9.h
>>
>> diff --git a/drivers/staging/media/meson/vdec/Makefile b/drivers/staging/media/meson/vdec/Makefile
>> index f55b6e625034..6e726af84ac9 100644
>> --- a/drivers/staging/media/meson/vdec/Makefile
>> +++ b/drivers/staging/media/meson/vdec/Makefile
>> @@ -3,6 +3,6 @@
>>  
>>  meson-vdec-objs = esparser.o vdec.o vdec_helpers.o vdec_platform.o
>>  meson-vdec-objs += vdec_1.o vdec_hevc.o
>> -meson-vdec-objs += codec_mpeg12.o codec_h264.o codec_hevc_common.o
>> +meson-vdec-objs += codec_mpeg12.o codec_h264.o codec_hevc_common.o codec_vp9.o
>>  
>>  obj-$(CONFIG_VIDEO_MESON_VDEC) += meson-vdec.o
>> diff --git a/drivers/staging/media/meson/vdec/codec_vp9.c b/drivers/staging/media/meson/vdec/codec_vp9.c
>> new file mode 100644
>> index 000000000000..e7ffbc6dd892
>> --- /dev/null
>> +++ b/drivers/staging/media/meson/vdec/codec_vp9.c
>> @@ -0,0 +1,2138 @@
> 
> ...
> 
>> +#define ROUND_POWER_OF_TWO(value, num) (((value) + (1 << ((num) - 1))) >> (num))
> 
> Checkpatch says:
> 
> CHECK: Macro argument reuse 'num' - possible side-effects?
> #377: FILE: drivers/staging/media/meson/vdec/codec_vp9.c:330:
> +#define ROUND_POWER_OF_TWO(value, num) (((value) + (1 << ((num) - 1))) >> (num))
> 
> While num is const in this source, I do prefer if this is turned into a static inline.
> 
> It's just safer.

Ok

> 
> Regards,
> 
> 	Hans
>