linux-kernel - Re: [PATCH v3] [media] coda: add Freescale firmware compatibility location

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Date:   Thu, 19 Jan 2017 14:19:35 +0200
From:   Baruch Siach <baruch@...s.co.il>
To:     Philipp Zabel <p.zabel@...gutronix.de>
Cc:     linux-media@...r.kernel.org, Fabio Estevam <festevam@...il.com>,
        Ming Lei <ming.lei@...onical.com>,
        "Luis R. Rodriguez" <mcgrof@...nel.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] [media] coda: add Freescale firmware compatibility
 location

Hi Philipp,

(Adding firmware loader maintainers to Cc).

On Thu, Jan 19, 2017 at 10:44:54AM +0100, Philipp Zabel wrote:
> On Wed, 2017-01-18 at 21:33 +0200, Baruch Siach wrote:
> > > -	if (dev->firmware == 1) {
> > > +	if (dev->firmware > 0) {
> > 
> > Why would vpu/vpu_fw_*.bin and v4l-coda960-*.bin be considered fallback 
> > firmware?
> 
> That was meant in the sense of a firmware loaded from fallback location.
> 
> See the comment below, I needed a string to tell the user that the
> preceding firmware not found error messages can be safely ignored. If
> you have an idea for better wording, feel free submit a change.
> 
> > >  		/*                                                                                                                            
> > >  		 * Since we can't suppress warnings for failed asynchronous
> > >  		 * firmware requests, report that the fallback firmware was
> > >  		 * found.
> > >  		 */
> > >  		dev_info(&pdev->dev, "Using fallback firmware %s\n",
> > >  			 dev->devtype->firmware[dev->firmware]);
> > >  	}

For the context, we are talking about these boot time messages:

[    2.152822] coda 2040000.vpu: Direct firmware load for vpu_fw_imx6q.bin failed with error -2
[    2.162669] coda 2040000.vpu: Using fallback firmware vpu/vpu_fw_imx6q.bin

Looks bad. There must be a better way to load a firmware file from a few 
optional locations. Actually, this use of the 'cont' parameter of 
request_firmware_nowait() to retry firmware load does not look like the 
intended use for the callback.

How about extending the firmware loader to accept multiple possible firmware 
locations?

baruch

-- 
     http://baruch.siach.name/blog/                  ~. .~   Tk Open Systems
=}------------------------------------------------ooO--U--Ooo------------{=
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