Date:	Tue, 19 Feb 2008 00:18:48 +0100
From:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
To:	Stefan Bader <stefan.bader@...onical.com>
Cc:	petkovbb@...il.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 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.

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

> Stefan
> 
> > commit 6cc44b0ce5c9270b15d456eb9ffa91b855e4e0d0
> > 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..4c9984f 100644
> > --- a/drivers/ide/ide-cd.c
> > +++ b/drivers/ide/ide-cd.c
> > @@ -1750,6 +1750,11 @@ 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)) {
> > +		printk(KERN_INFO "ide-cd: audio play not advertised in caps "
> > +				"page for drive model [%s], enabling quirk.\n",
> > +				drive->id->model);
> > +	}
> >  	if ((buf[8 + 4] & 0x01) || (cd->cd_flags & IDE_CD_FLAG_PLAY_AUDIO_OK))
> >  		cdi->mask &= ~CDC_PLAY_AUDIO;
> >  
> > @@ -1929,6 +1934,7 @@ 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 }
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