linux-kernel - Re: [PATCH v8 1/2] Added Digiteq Automotive MGB4 driver

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Date:   Thu, 27 Jul 2023 21:58:22 +0200
From:   Martin Tůma <tumic@...see.org>
To:     Hans Verkuil <hverkuil-cisco@...all.nl>,
        Mauro Carvalho Chehab <mchehab@...nel.org>
Cc:     linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        Martin Tůma <martin.tuma@...iteqautomotive.com>
Subject: Re: [PATCH v8 1/2] Added Digiteq Automotive MGB4 driver

On 26. 07. 23 11:14, Hans Verkuil wrote:
> Hi Martin,
> 
> On 04/07/2023 15:13, tumic@...see.org wrote:
>> From: Martin Tůma <martin.tuma@...iteqautomotive.com>
>>
>> Digiteq Automotive MGB4 is a modular frame grabber PCIe card for automotive
>> video interfaces. As for now, two modules - FPD-Link and GMSL - are
>> available and supported by the driver. The card has two inputs and two
>> outputs (FPD-Link only).
>>
>> In addition to the video interfaces it also provides a trigger signal
>> interface and a MTD interface for FPGA firmware upload.
>>
>> Signed-off-by: Martin Tůma <martin.tuma@...iteqautomotive.com>
>> ---
>>   MAINTAINERS                             |   7 +
>>   drivers/media/pci/Kconfig               |   1 +
>>   drivers/media/pci/Makefile              |   1 +
>>   drivers/media/pci/mgb4/Kconfig          |  17 +
>>   drivers/media/pci/mgb4/Makefile         |   6 +
>>   drivers/media/pci/mgb4/mgb4_cmt.c       | 244 +++++++
>>   drivers/media/pci/mgb4/mgb4_cmt.h       |  17 +
>>   drivers/media/pci/mgb4/mgb4_core.c      | 711 ++++++++++++++++++
>>   drivers/media/pci/mgb4/mgb4_core.h      |  72 ++
>>   drivers/media/pci/mgb4/mgb4_dma.c       | 123 ++++
>>   drivers/media/pci/mgb4/mgb4_dma.h       |  18 +
>>   drivers/media/pci/mgb4/mgb4_i2c.c       | 140 ++++
>>   drivers/media/pci/mgb4/mgb4_i2c.h       |  35 +
>>   drivers/media/pci/mgb4/mgb4_io.h        |  33 +
>>   drivers/media/pci/mgb4/mgb4_regs.c      |  30 +
>>   drivers/media/pci/mgb4/mgb4_regs.h      |  35 +
>>   drivers/media/pci/mgb4/mgb4_sysfs.h     |  18 +
>>   drivers/media/pci/mgb4/mgb4_sysfs_in.c  | 757 +++++++++++++++++++
>>   drivers/media/pci/mgb4/mgb4_sysfs_out.c | 700 ++++++++++++++++++
>>   drivers/media/pci/mgb4/mgb4_sysfs_pci.c |  71 ++
>>   drivers/media/pci/mgb4/mgb4_trigger.c   | 208 ++++++
>>   drivers/media/pci/mgb4/mgb4_trigger.h   |   8 +
>>   drivers/media/pci/mgb4/mgb4_vin.c       | 930 ++++++++++++++++++++++++
>>   drivers/media/pci/mgb4/mgb4_vin.h       |  69 ++
>>   drivers/media/pci/mgb4/mgb4_vout.c      | 594 +++++++++++++++
>>   drivers/media/pci/mgb4/mgb4_vout.h      |  65 ++
>>   26 files changed, 4910 insertions(+)
>>   create mode 100644 drivers/media/pci/mgb4/Kconfig
>>   create mode 100644 drivers/media/pci/mgb4/Makefile
>>   create mode 100644 drivers/media/pci/mgb4/mgb4_cmt.c
>>   create mode 100644 drivers/media/pci/mgb4/mgb4_cmt.h
>>   create mode 100644 drivers/media/pci/mgb4/mgb4_core.c
>>   create mode 100644 drivers/media/pci/mgb4/mgb4_core.h
>>   create mode 100644 drivers/media/pci/mgb4/mgb4_dma.c
>>   create mode 100644 drivers/media/pci/mgb4/mgb4_dma.h
>>   create mode 100644 drivers/media/pci/mgb4/mgb4_i2c.c
>>   create mode 100644 drivers/media/pci/mgb4/mgb4_i2c.h
>>   create mode 100644 drivers/media/pci/mgb4/mgb4_io.h
>>   create mode 100644 drivers/media/pci/mgb4/mgb4_regs.c
>>   create mode 100644 drivers/media/pci/mgb4/mgb4_regs.h
>>   create mode 100644 drivers/media/pci/mgb4/mgb4_sysfs.h
>>   create mode 100644 drivers/media/pci/mgb4/mgb4_sysfs_in.c
>>   create mode 100644 drivers/media/pci/mgb4/mgb4_sysfs_out.c
>>   create mode 100644 drivers/media/pci/mgb4/mgb4_sysfs_pci.c
>>   create mode 100644 drivers/media/pci/mgb4/mgb4_trigger.c
>>   create mode 100644 drivers/media/pci/mgb4/mgb4_trigger.h
>>   create mode 100644 drivers/media/pci/mgb4/mgb4_vin.c
>>   create mode 100644 drivers/media/pci/mgb4/mgb4_vin.h
>>   create mode 100644 drivers/media/pci/mgb4/mgb4_vout.c
>>   create mode 100644 drivers/media/pci/mgb4/mgb4_vout.h
>>
> 
> When I build with: make W=1 KCFLAGS=-Wmaybe-uninitialized
> 
> I get this warning:
> 
> drivers/media/pci/mgb4/mgb4_vout.c: In function 'mgb4_vout_create':
> drivers/media/pci/mgb4/mgb4_vout.c:473:27: warning: variable 'video' set but not used [-Wunused-but-set-variable]
>    473 |         struct mgb4_regs *video;
>        |                           ^~~~~
> 
> Regards,
> 
> 	Hans

Hi,
Thanks for pointing this out. I was making some minor code cleanup when 
creating the v8 patch and probably missed that. I will fix it in v9.

M.