linux-kernel - Re: [PATCH v2 6/7] misc: bcm-vk: add Broadcom VK driver

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Date:   Thu, 20 Feb 2020 08:47:11 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Scott Branden <scott.branden@...adcom.com>
Cc:     Luis Chamberlain <mcgrof@...nel.org>,
        David Brown <david.brown@...aro.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Shuah Khan <shuah@...nel.org>, bjorn.andersson@...aro.org,
        Shuah Khan <skhan@...uxfoundation.org>,
        Arnd Bergmann <arnd@...db.de>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-fsdevel@...r.kernel.org,
        BCM Kernel Feedback <bcm-kernel-feedback-list@...adcom.com>,
        Olof Johansson <olof@...om.net>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Colin Ian King <colin.king@...onical.com>,
        Kees Cook <keescook@...omium.org>,
        Takashi Iwai <tiwai@...e.de>, linux-kselftest@...r.kernel.org,
        Andy Gross <agross@...nel.org>,
        Desmond Yan <desmond.yan@...adcom.com>,
        James Hu <james.hu@...adcom.com>
Subject: Re: [PATCH v2 6/7] misc: bcm-vk: add Broadcom VK driver

On Wed, Feb 19, 2020 at 04:48:24PM -0800, Scott Branden wrote:
> Add Broadcom VK driver offload engine.
> This driver interfaces to the VK PCIe offload engine to perform
> should offload functions as video transcoding on multiple streams
> in parallel.  VK device is booted from files loaded using
> request_firmware_into_buf mechanism.  After booted card status is updated
> and messages can then be sent to the card.
> Such messages contain scatter gather list of addresses
> to pull data from the host to perform operations on.

Why is this a tty driver?

Have you worked with the V4L developers to tie this into the proper
in-kernel apis for this type of functionality?

Using a tty driver seems like the totally incorrect way to do this, what
am I missing?

Also, do not make up random error values, you return "-1" a lot here,
that is not ok.  Please fix up to return the correct -Ewhatever values
instead.

thanks,

greg k-h