Date:	Tue, 19 Feb 2008 06:52:33 +0100
From:	Borislav Petkov <petkovbb@...glemail.com>
To:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
Cc:	Stefan Bader <stefan.bader@...onical.com>,
	linux-kernel@...r.kernel.org, linux-ide@...r.kernel.org,
	Jens Axboe <jens.axboe@...cle.com>
Subject: Re: Optiarc DVD RW AD-5200A audio playing

On Tue, Feb 19, 2008 at 12:18:48AM +0100, Bartlomiej Zolnierkiewicz wrote:
> On Monday 18 February 2008, Stefan Bader wrote:
> > Borislav Petkov wrote:
> > > On Sat, Feb 16, 2008 at 04:24:01PM +0100, Bartlomiej Zolnierkiewicz wrote:
> > >> Hi,
> > >>
> > >> On Saturday 16 February 2008, Borislav Petkov wrote:
> > >>> On Fri, Feb 15, 2008 at 02:53:27PM -0500, Stefan Bader wrote:
> > >>>> Hello Borislav,
> > >>>>
> > >>>> I worked on a problem with an DVD driver (model=Optiarc DVD RW AD-5200A)
> > >>>> which obviously has the same problem as some Matshita drives. The
> > >>>> following patch was reported to enabled audio playing on this drive.
> > >>>> Would this approach be suitable for upstream or are there other
> > >>>> solutions to this problem?
> > >>>>
> > >>>> Regards,
> > >>>> Stefan
> > >>>>
> > >>>> --- a/drivers/ide/ide-cd.c
> > >>>> +++ b/drivers/ide/ide-cd.c
> > >>>> @@ -2988,7 +2988,8 @@ int ide_cdrom_probe_capabilities (ide_drive_t *drive)
> > >>>>  	if (strcmp(drive->id->model, "MATSHITADVD-ROM SR-8187") == 0 ||
> > >>>>  	    strcmp(drive->id->model, "MATSHITADVD-ROM SR-8186") == 0 ||
> > >>>>  	    strcmp(drive->id->model, "MATSHITADVD-ROM SR-8176") == 0 ||
> > >>>> -	    strcmp(drive->id->model, "MATSHITADVD-ROM SR-8174") == 0)
> > >>>> +	    strcmp(drive->id->model, "MATSHITADVD-ROM SR-8174") == 0 ||
> > >>>> +	    strcmp(drive->id->model, "Optiarc DVD RW AD-5200A") == 0)
> > >>>>  		CDROM_CONFIG_FLAGS(drive)->audio_play = 1;
> > >>>>
> > >>>>  #if ! STANDARD_ATAPI
> > >>> Hi Stefan,
> > >>>
> > >>> just to make sure that the audioplay bit is not set in the capabilities page,
> > >>> can you please try the following patch applied against 2.6.25-rc2 and send me
> > >>> the output. Thanks!
> > >>>
> > >>> @Bart: by the way, this cdi->mask thingy is kinda unintuitive doing double
> > >>> negation to check whether a feature is supported or not. Yeah, this comes from
> > >>> "above," i.e. uniform cdrom layer. But still, shouldn't we use a cdi->caps_flags
> > >>> or something similar instead, which mirrors the caps page bits setting?
> > >> It seems so (at least having negative flags is very unintuitive) but they
> > >> might be some reason for this ugliness, Jens?
> > >>
> > >> [ Please also remember that since cdrom layer is _uniform_ it may be not
> > >>   possible and/or desirable to have 1-1 mapping between caps page bits
> > >>   and the future cdi->caps_flags. ]
> > >>
> > >>> commit 435f0f4496a1b32af2d542f43b2370a890fe2f83
> > >>> Author: Borislav Petkov <petkovbb@...il.com>
> > >>> Date:   Sat Feb 16 09:56:36 2008 +0100
> > >>>
> > >>>     ide-cd: Enable audio play quirk for Optiarc DVD RW AD-5200A drive
> > >>>     
> > >>>     Reported-by: Stefan Bader <stefan.bader@...onical.com>
> > >>>     Signed-off-by: Borislav Petkov <petkovbb@...il.com>
> > >>>
> > >>> diff --git a/drivers/ide/ide-cd.c b/drivers/ide/ide-cd.c
> > >>> index f77db6b..2c9d06e 100644
> > >>> --- a/drivers/ide/ide-cd.c
> > >>> +++ b/drivers/ide/ide-cd.c
> > >>> @@ -1750,6 +1750,10 @@ int ide_cdrom_probe_capabilities (ide_drive_t *drive)
> > >>>  		cdi->mask &= ~(CDC_DVD_RAM | CDC_RAM);
> > >>>  	if (buf[8 + 3] & 0x10)
> > >>>  		cdi->mask &= ~CDC_DVD_R;
> > >>> +	if (!(buf[8 + 4] & 0x01)) {
> > >> Hmm, shouldn't there be '&& (cd->cd_flags & IDE_CD_FLAG_PLAY_AUDIO_OK)'
> > >> to prevent false positives?
> > > 
> > > I wanted to see whether the caps page reports the audioplay bit off...
> > > 
> > >>> +		printk(KERN_INFO "ide-cd: audio play not advertised in caps page,"
> > >> Would be nice to also printk() the device name.
> > > 
> > > ... but printing the device model is actually a good idea and this will rule out
> > > false positives, so Stefan, please drop the previous patch and test the updated
> > > one below. Thanks.
> > > 
> > > 
> > 
> > Hi Borislav,
> > 
> > the problem is that I don't own this drive myself and the owner is
> > running a 2.6.22 kernel and is normally not doing any kernel compiles.
> > But I could provide him a modified patch.
> > Though, if you just want to know whether the cap bit was really unset, I
> > think we know this already. When I got the problem report we checked
> > /proc/sys/dev/cdrom/info and that showed the "Can play audio" bit as 0.
> > Which is the reason I gave the owner the patch for adding the model to
> > the excemption list. And from his feedback I take that the drive plays
> > audio tracks with the patch in use.
> 
> Borislav, I guess that this is good enough proof that audioplay bit is off.

indeed.

> Could you please send me the final version of the patch?

commit fa4af2fab0804bead4da6ecbf468118f05111229
Author: Borislav Petkov <petkovbb@...il.com>
Date:   Sat Feb 16 09:56:36 2008 +0100

    ide-cd: Enable audio play quirk for Optiarc DVD RW AD-5200A drive
    
    Reported-by: Stefan Bader <stefan.bader@...onical.com>
    Signed-off-by: Borislav Petkov <petkovbb@...il.com>

diff --git a/drivers/ide/ide-cd.c b/drivers/ide/ide-cd.c
index f77db6b..9e63c34 100644
--- a/drivers/ide/ide-cd.c
+++ b/drivers/ide/ide-cd.c
@@ -1929,6 +1929,7 @@ static const struct cd_list_entry ide_cd_quirks_list[] = {
 	{ "MATSHITADVD-ROM SR-8186", NULL,   IDE_CD_FLAG_PLAY_AUDIO_OK	    },
 	{ "MATSHITADVD-ROM SR-8176", NULL,   IDE_CD_FLAG_PLAY_AUDIO_OK	    },
 	{ "MATSHITADVD-ROM SR-8174", NULL,   IDE_CD_FLAG_PLAY_AUDIO_OK	    },
+	{ "Optiarc DVD RW AD-5200A", NULL,   IDE_CD_FLAG_PLAY_AUDIO_OK      },
 	{ NULL, NULL, 0 }
 };
 

-- 
Regards/Gruß,
    Boris.
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