Re: [U-Boot] [PATCH 10/14] dm: mmc: sunxi: Add support for driver model

[Maxime Ripard]

Hi Siarhei,

On Fri, Jul 28, 2017 at 11:15:44PM +0300, Siarhei Siamashka wrote:
> On Fri, 28 Jul 2017 18:08:31 +0200
> Maxime Ripard  wrote:
> 
> > On Thu, Jul 27, 2017 at 10:19:44PM -0600, Simon Glass wrote:
> > > Hi Maxime,
> > > 
> > > On 17 July 2017 at 03:26, Maxime Ripard
> > >  wrote:  
> > > > Hi Simon,
> > > >
> > > > On Fri, Jul 14, 2017 at 07:47:45AM -0600, Simon Glass wrote:  
> > > >> On 5 July 2017 at 14:14, Maxime Ripard 
> > > >>  wrote:  
> > > >> > On Wed, Jul 05, 2017 at 04:57:40PM +0200, Maxime Ripard wrote:  
> > > >> >> On Tue, Jul 04, 2017 at 01:33:25PM -0600, Simon Glass wrote:  
> > > >> >> > Hi Maxime,
> > > >> >> >
> > > >> >> > On 21 June 2017 at 01:31, Maxime Ripard
> > > >> >> >  wrote:  
> > > >> >> > > Hi Simon,
> > > >> >> > >
> > > >> >> > > On Mon, Jun 19, 2017 at 11:11:27AM -0600, Simon Glass wrote:  
> > > >> >> > >> Add a driver-model version of this driver which mostly uses 
> > > >> >> > >> the existing
> > > >> >> > >> code. The old code can be removed once all boards are switched 
> > > >> >> > >> over.
> > > >> >> > >>
> > > >> >> > >> Signed-off-by: Simon Glass   
> > > >> >> > >
> > > >> >> > > I'm not sure if you tested that, but we have some code that 
> > > >> >> > > switches
> > > >> >> > > the MMC indices when using both an eMMC and an external MMC.
> > > >> >> > >
> > > >> >> > > http://git.denx.de/?p=u-boot.git;a=blob;f=board/sunxi/board.c#l494
> > > >> >> > >
> > > >> >> > > This predates my time, but it seems that it was done to have a
> > > >> >> > > consistent boot MMC device ID.
> > > >> >> > >
> > > >> >> > > I'm not really sure we can get rid of it (even if it creates 
> > > >> >> > > some
> > > >> >> > > issues of it's own), but what would be the impact of a switch 
> > > >> >> > > to the
> > > >> >> > > device model on that logic?  
> > > >> >> >
> > > >> >> > That is a pretty terrible hack.  
> > > >> >>
> > > >> >> Yes, I know. This is especially bad when used together with other
> > > >> >> tools that rely on one MMC index for example (such as fastboot).
> > > >> >>
> > > >> >> I wanted to kill it for quite some time, but I'm a bit reluctant due
> > > >> >> to the possible side effects.
> > > >> >>  
> > > >> >> > I'm not sure whether it will continue to work with DM. It does 
> > > >> >> > still
> > > >> >> > use the device number in the block device, so maybe...  Do you 
> > > >> >> > have
> > > >> >> > a board would use this?  
> > > >> >>
> > > >> >> I guess I do. I'll give it a try or tonight and let you know.  
> > > >> >
> > > >> > I just tested. Even with an eMMC (which was the first use case for
> > > >> > that hack), it works, even things that are not mainline yet 
> > > >> > (fastboot,
> > > >> > etc).
> > > >> >
> > > >> > It obviously break the old scripts relying on the mmc index, but I
> > > >> > guess that's ok.
> > > >> >
> > > >> > There's one regression though. Our eMMC will always be the second 
> > > >> > one,
> > > >> > which means that the distro bootargs will always boot on the external
> > > >> > SD first (which is always going to be mmc0).
> > > >> >
> > > >> > That's due to the fact that the eMMC controller is the third one, and
> > > >> > is thus probed last. We obviously want something deterministic for
> > > >> > fastboot for example, but booting partitions of the media you started
> > > >> > from make sense I guess. And this is what this hack was trying to
> > > >> > address.  
> > > >>
> > > >> OK...so what should we do here?  
> > > >
> > > > I guess we should just drop the hack. We'll have to at some point
> > > > anyway. But I guess we should also find a way to tweak the distro
> > > > bootcmd at boot time to search for the medium that we booted on first.
> > > >
> > > > I'm not really sure how to do this though.  
> 
> You can check how this is done for USB FEL boot. Basically, we set an
> environment variable if we see that the boot source is FEL:
>
> http://git.denx.de/?p=u-boot.git;a=commitdiff;h=af654d14613f22f4910601d86e584030ee392b94
> 
> And then check this environment variable from bootcmd:
>
> http://git.denx.de/?p=u-boot.git;a=commitdiff;h=f3b589c09b43a231706f11ab391e5ea7f9670f12
> 
> This can be done in a pretty much the same way for eMMC. Or maybe even
> generalized to also use this for different boot sources and non-sunxi
> SoCs.

That looks like a good solution, we'll give it a shot.

Thanks!
Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com


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Re: [U-Boot] [PATCH 10/14] dm: mmc: sunxi: Add support for driver model

[Simon Glass]

Hi Suneel,

On 28 July 2017 at 15:34, Suneel Garapati  wrote:
> Hi Simon,
>
>
> On Fri, Jul 28, 2017 at 11:44 AM, Simon Glass  wrote:
>> Hi Suneel,
>>
>> On 27 July 2017 at 23:03, Suneel Garapati  wrote:
>>> Hi Simon,
>>>
>>> I have similar requirement of Cavium boards using two card slots on
>>> one host and currently trying to figure out to support it using
>>> DM_MMC.
>>> Would like to know if you have quick thoughts or seen similar use case
>>> with some other boards too?
>>
>> It should work correctly - what sort of problem do you have?
>
> Each mmc_bind call creates child blk_device and initialize the mmc
> structure with defaults and further mmc_init or driver_probe would set
> the rest of the members.
> For the case, one host and two card slots, assuming card slots put up
> as child nodes to mmc node in devicetree
>  - driver probe called for once on host, initiates only one
> mmc_bind call -> only one child blk device(udevice) created
>  - also 'struct mmc' includes card specific data cid csd scr rca
> which should scale for multiple slots simultaneously
>  - assuming boot up detects two cards on two slots, mmc dev 0 will
> chose host but not slot
>  - mmc_uclass_priv holds mmc reference but depending on slot it
> should get updated.
>  - maybe need to split mmc into mmc_host and mmc_card structures like 
> Linux.
>
> Also, mmc dev 0/1 from cmd prompt would choose host and not the card slot.

I thought this thread was about switching between different MMC controllers...

OK, I see. I did not know that an MMC controller could support two
devices. How do you switch between slots? Does U-Boot have any support
for this at present?

It should be possible to add a second child device for MMC easily
enough. But there will need to be some changes, e.g.
mmc_get_blk_desc() will need an extra parameter with the slot number.

Regards,
Simon

>
> Please correct me.
>
> Regards,
> Suneel
>
>>
>>>
>>> Please correct me if I miss something obvious.
>>>
>>
>> Regards,
>> Simon
>>
>>> Regards,
>>> Suneel
>>>
>>>
>>> On Thu, Jul 27, 2017 at 9:19 PM, Simon Glass  wrote:
 Hi Maxime,

 On 17 July 2017 at 03:26, Maxime Ripard
  wrote:
> Hi Simon,
>
> On Fri, Jul 14, 2017 at 07:47:45AM -0600, Simon Glass wrote:
>> On 5 July 2017 at 14:14, Maxime Ripard 
>>  wrote:
>> > On Wed, Jul 05, 2017 at 04:57:40PM +0200, Maxime Ripard wrote:
>> >> On Tue, Jul 04, 2017 at 01:33:25PM -0600, Simon Glass wrote:
>> >> > Hi Maxime,
>> >> >
>> >> > On 21 June 2017 at 01:31, Maxime Ripard
>> >> >  wrote:
>> >> > > Hi Simon,
>> >> > >
>> >> > > On Mon, Jun 19, 2017 at 11:11:27AM -0600, Simon Glass wrote:
>> >> > >> Add a driver-model version of this driver which mostly uses the 
>> >> > >> existing
>> >> > >> code. The old code can be removed once all boards are switched 
>> >> > >> over.
>> >> > >>
>> >> > >> Signed-off-by: Simon Glass 
>> >> > >
>> >> > > I'm not sure if you tested that, but we have some code that 
>> >> > > switches
>> >> > > the MMC indices when using both an eMMC and an external MMC.
>> >> > >
>> >> > > http://git.denx.de/?p=u-boot.git;a=blob;f=board/sunxi/board.c#l494
>> >> > >
>> >> > > This predates my time, but it seems that it was done to have a
>> >> > > consistent boot MMC device ID.
>> >> > >
>> >> > > I'm not really sure we can get rid of it (even if it creates some
>> >> > > issues of it's own), but what would be the impact of a switch to 
>> >> > > the
>> >> > > device model on that logic?
>> >> >
>> >> > That is a pretty terrible hack.
>> >>
>> >> Yes, I know. This is especially bad when used together with other
>> >> tools that rely on one MMC index for example (such as fastboot).
>> >>
>> >> I wanted to kill it for quite some time, but I'm a bit reluctant due
>> >> to the possible side effects.
>> >>
>> >> > I'm not sure whether it will continue to work with DM. It does still
>> >> > use the device number in the block device, so maybe...  Do you have
>> >> > a board would use this?
>> >>
>> >> I guess I do. I'll give it a try or tonight and let you know.
>> >
>> > I just tested. Even with an eMMC (which was the first use case for
>> > that hack), it works, even things that are not mainline yet (fastboot,
>> > etc).
>> >
>> > It obviously break the old scripts relying on the mmc index, but I
>> > guess that's ok.
>> >
>> > There's one regression though. Our eMMC will always be the second one,
>> > which means that the distro bootargs will always boot on the external
>> > SD first (which is always going to be mmc0).
>> >
>> > 

Re: [U-Boot] [PATCH 10/14] dm: mmc: sunxi: Add support for driver model

[Suneel Garapati]

Hi Simon,


On Fri, Jul 28, 2017 at 11:44 AM, Simon Glass  wrote:
> Hi Suneel,
>
> On 27 July 2017 at 23:03, Suneel Garapati  wrote:
>> Hi Simon,
>>
>> I have similar requirement of Cavium boards using two card slots on
>> one host and currently trying to figure out to support it using
>> DM_MMC.
>> Would like to know if you have quick thoughts or seen similar use case
>> with some other boards too?
>
> It should work correctly - what sort of problem do you have?

Each mmc_bind call creates child blk_device and initialize the mmc
structure with defaults and further mmc_init or driver_probe would set
the rest of the members.
For the case, one host and two card slots, assuming card slots put up
as child nodes to mmc node in devicetree
 - driver probe called for once on host, initiates only one
mmc_bind call -> only one child blk device(udevice) created
 - also 'struct mmc' includes card specific data cid csd scr rca
which should scale for multiple slots simultaneously
 - assuming boot up detects two cards on two slots, mmc dev 0 will
chose host but not slot
 - mmc_uclass_priv holds mmc reference but depending on slot it
should get updated.
 - maybe need to split mmc into mmc_host and mmc_card structures like Linux.

Also, mmc dev 0/1 from cmd prompt would choose host and not the card slot.

Please correct me.

Regards,
Suneel

>
>>
>> Please correct me if I miss something obvious.
>>
>
> Regards,
> Simon
>
>> Regards,
>> Suneel
>>
>>
>> On Thu, Jul 27, 2017 at 9:19 PM, Simon Glass  wrote:
>>> Hi Maxime,
>>>
>>> On 17 July 2017 at 03:26, Maxime Ripard
>>>  wrote:
 Hi Simon,

 On Fri, Jul 14, 2017 at 07:47:45AM -0600, Simon Glass wrote:
> On 5 July 2017 at 14:14, Maxime Ripard  
> wrote:
> > On Wed, Jul 05, 2017 at 04:57:40PM +0200, Maxime Ripard wrote:
> >> On Tue, Jul 04, 2017 at 01:33:25PM -0600, Simon Glass wrote:
> >> > Hi Maxime,
> >> >
> >> > On 21 June 2017 at 01:31, Maxime Ripard
> >> >  wrote:
> >> > > Hi Simon,
> >> > >
> >> > > On Mon, Jun 19, 2017 at 11:11:27AM -0600, Simon Glass wrote:
> >> > >> Add a driver-model version of this driver which mostly uses the 
> >> > >> existing
> >> > >> code. The old code can be removed once all boards are switched 
> >> > >> over.
> >> > >>
> >> > >> Signed-off-by: Simon Glass 
> >> > >
> >> > > I'm not sure if you tested that, but we have some code that 
> >> > > switches
> >> > > the MMC indices when using both an eMMC and an external MMC.
> >> > >
> >> > > http://git.denx.de/?p=u-boot.git;a=blob;f=board/sunxi/board.c#l494
> >> > >
> >> > > This predates my time, but it seems that it was done to have a
> >> > > consistent boot MMC device ID.
> >> > >
> >> > > I'm not really sure we can get rid of it (even if it creates some
> >> > > issues of it's own), but what would be the impact of a switch to 
> >> > > the
> >> > > device model on that logic?
> >> >
> >> > That is a pretty terrible hack.
> >>
> >> Yes, I know. This is especially bad when used together with other
> >> tools that rely on one MMC index for example (such as fastboot).
> >>
> >> I wanted to kill it for quite some time, but I'm a bit reluctant due
> >> to the possible side effects.
> >>
> >> > I'm not sure whether it will continue to work with DM. It does still
> >> > use the device number in the block device, so maybe...  Do you have
> >> > a board would use this?
> >>
> >> I guess I do. I'll give it a try or tonight and let you know.
> >
> > I just tested. Even with an eMMC (which was the first use case for
> > that hack), it works, even things that are not mainline yet (fastboot,
> > etc).
> >
> > It obviously break the old scripts relying on the mmc index, but I
> > guess that's ok.
> >
> > There's one regression though. Our eMMC will always be the second one,
> > which means that the distro bootargs will always boot on the external
> > SD first (which is always going to be mmc0).
> >
> > That's due to the fact that the eMMC controller is the third one, and
> > is thus probed last. We obviously want something deterministic for
> > fastboot for example, but booting partitions of the media you started
> > from make sense I guess. And this is what this hack was trying to
> > address.
>
> OK...so what should we do here?

 I guess we should just drop the hack. We'll have to at some point
 anyway. But I guess we should also find a way to tweak the distro
 bootcmd at boot time to search for the medium that we booted on first.

 I'm not really sure how to do this though.
>>>
>>> Well in that case let's drop the 

Re: [U-Boot] [PATCH 10/14] dm: mmc: sunxi: Add support for driver model

[Siarhei Siamashka]

On Fri, 28 Jul 2017 18:08:31 +0200
Maxime Ripard  wrote:

> On Thu, Jul 27, 2017 at 10:19:44PM -0600, Simon Glass wrote:
> > Hi Maxime,
> > 
> > On 17 July 2017 at 03:26, Maxime Ripard
> >  wrote:  
> > > Hi Simon,
> > >
> > > On Fri, Jul 14, 2017 at 07:47:45AM -0600, Simon Glass wrote:  
> > >> On 5 July 2017 at 14:14, Maxime Ripard 
> > >>  wrote:  
> > >> > On Wed, Jul 05, 2017 at 04:57:40PM +0200, Maxime Ripard wrote:  
> > >> >> On Tue, Jul 04, 2017 at 01:33:25PM -0600, Simon Glass wrote:  
> > >> >> > Hi Maxime,
> > >> >> >
> > >> >> > On 21 June 2017 at 01:31, Maxime Ripard
> > >> >> >  wrote:  
> > >> >> > > Hi Simon,
> > >> >> > >
> > >> >> > > On Mon, Jun 19, 2017 at 11:11:27AM -0600, Simon Glass wrote:  
> > >> >> > >> Add a driver-model version of this driver which mostly uses the 
> > >> >> > >> existing
> > >> >> > >> code. The old code can be removed once all boards are switched 
> > >> >> > >> over.
> > >> >> > >>
> > >> >> > >> Signed-off-by: Simon Glass   
> > >> >> > >
> > >> >> > > I'm not sure if you tested that, but we have some code that 
> > >> >> > > switches
> > >> >> > > the MMC indices when using both an eMMC and an external MMC.
> > >> >> > >
> > >> >> > > http://git.denx.de/?p=u-boot.git;a=blob;f=board/sunxi/board.c#l494
> > >> >> > >
> > >> >> > > This predates my time, but it seems that it was done to have a
> > >> >> > > consistent boot MMC device ID.
> > >> >> > >
> > >> >> > > I'm not really sure we can get rid of it (even if it creates some
> > >> >> > > issues of it's own), but what would be the impact of a switch to 
> > >> >> > > the
> > >> >> > > device model on that logic?  
> > >> >> >
> > >> >> > That is a pretty terrible hack.  
> > >> >>
> > >> >> Yes, I know. This is especially bad when used together with other
> > >> >> tools that rely on one MMC index for example (such as fastboot).
> > >> >>
> > >> >> I wanted to kill it for quite some time, but I'm a bit reluctant due
> > >> >> to the possible side effects.
> > >> >>  
> > >> >> > I'm not sure whether it will continue to work with DM. It does still
> > >> >> > use the device number in the block device, so maybe...  Do you have
> > >> >> > a board would use this?  
> > >> >>
> > >> >> I guess I do. I'll give it a try or tonight and let you know.  
> > >> >
> > >> > I just tested. Even with an eMMC (which was the first use case for
> > >> > that hack), it works, even things that are not mainline yet (fastboot,
> > >> > etc).
> > >> >
> > >> > It obviously break the old scripts relying on the mmc index, but I
> > >> > guess that's ok.
> > >> >
> > >> > There's one regression though. Our eMMC will always be the second one,
> > >> > which means that the distro bootargs will always boot on the external
> > >> > SD first (which is always going to be mmc0).
> > >> >
> > >> > That's due to the fact that the eMMC controller is the third one, and
> > >> > is thus probed last. We obviously want something deterministic for
> > >> > fastboot for example, but booting partitions of the media you started
> > >> > from make sense I guess. And this is what this hack was trying to
> > >> > address.  
> > >>
> > >> OK...so what should we do here?  
> > >
> > > I guess we should just drop the hack. We'll have to at some point
> > > anyway. But I guess we should also find a way to tweak the distro
> > > bootcmd at boot time to search for the medium that we booted on first.
> > >
> > > I'm not really sure how to do this though.  

You can check how this is done for USB FEL boot. Basically, we set an
environment variable if we see that the boot source is FEL:
   
http://git.denx.de/?p=u-boot.git;a=commitdiff;h=af654d14613f22f4910601d86e584030ee392b94

And then check this environment variable from bootcmd:
   
http://git.denx.de/?p=u-boot.git;a=commitdiff;h=f3b589c09b43a231706f11ab391e5ea7f9670f12

This can be done in a pretty much the same way for eMMC. Or maybe even
generalized to also use this for different boot sources and non-sunxi
SoCs.

> > 
> > Well in that case let's drop the hack and someone will pick it up when
> > it hits them.  
> 
> That works for me.

Deliberately breaking something just to see if some end user runs into
troubles, wastes time to bisect the problem and comes up with a fix
looks like a dick move.

-- 
Best regards,
Siarhei Siamashka
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Re: [U-Boot] [PATCH 10/14] dm: mmc: sunxi: Add support for driver model

[Simon Glass]

Hi Suneel,

On 27 July 2017 at 23:03, Suneel Garapati  wrote:
> Hi Simon,
>
> I have similar requirement of Cavium boards using two card slots on
> one host and currently trying to figure out to support it using
> DM_MMC.
> Would like to know if you have quick thoughts or seen similar use case
> with some other boards too?

It should work correctly - what sort of problem do you have?

>
> Please correct me if I miss something obvious.
>

Regards,
Simon

> Regards,
> Suneel
>
>
> On Thu, Jul 27, 2017 at 9:19 PM, Simon Glass  wrote:
>> Hi Maxime,
>>
>> On 17 July 2017 at 03:26, Maxime Ripard
>>  wrote:
>>> Hi Simon,
>>>
>>> On Fri, Jul 14, 2017 at 07:47:45AM -0600, Simon Glass wrote:
 On 5 July 2017 at 14:14, Maxime Ripard  
 wrote:
 > On Wed, Jul 05, 2017 at 04:57:40PM +0200, Maxime Ripard wrote:
 >> On Tue, Jul 04, 2017 at 01:33:25PM -0600, Simon Glass wrote:
 >> > Hi Maxime,
 >> >
 >> > On 21 June 2017 at 01:31, Maxime Ripard
 >> >  wrote:
 >> > > Hi Simon,
 >> > >
 >> > > On Mon, Jun 19, 2017 at 11:11:27AM -0600, Simon Glass wrote:
 >> > >> Add a driver-model version of this driver which mostly uses the 
 >> > >> existing
 >> > >> code. The old code can be removed once all boards are switched 
 >> > >> over.
 >> > >>
 >> > >> Signed-off-by: Simon Glass 
 >> > >
 >> > > I'm not sure if you tested that, but we have some code that switches
 >> > > the MMC indices when using both an eMMC and an external MMC.
 >> > >
 >> > > http://git.denx.de/?p=u-boot.git;a=blob;f=board/sunxi/board.c#l494
 >> > >
 >> > > This predates my time, but it seems that it was done to have a
 >> > > consistent boot MMC device ID.
 >> > >
 >> > > I'm not really sure we can get rid of it (even if it creates some
 >> > > issues of it's own), but what would be the impact of a switch to the
 >> > > device model on that logic?
 >> >
 >> > That is a pretty terrible hack.
 >>
 >> Yes, I know. This is especially bad when used together with other
 >> tools that rely on one MMC index for example (such as fastboot).
 >>
 >> I wanted to kill it for quite some time, but I'm a bit reluctant due
 >> to the possible side effects.
 >>
 >> > I'm not sure whether it will continue to work with DM. It does still
 >> > use the device number in the block device, so maybe...  Do you have
 >> > a board would use this?
 >>
 >> I guess I do. I'll give it a try or tonight and let you know.
 >
 > I just tested. Even with an eMMC (which was the first use case for
 > that hack), it works, even things that are not mainline yet (fastboot,
 > etc).
 >
 > It obviously break the old scripts relying on the mmc index, but I
 > guess that's ok.
 >
 > There's one regression though. Our eMMC will always be the second one,
 > which means that the distro bootargs will always boot on the external
 > SD first (which is always going to be mmc0).
 >
 > That's due to the fact that the eMMC controller is the third one, and
 > is thus probed last. We obviously want something deterministic for
 > fastboot for example, but booting partitions of the media you started
 > from make sense I guess. And this is what this hack was trying to
 > address.

 OK...so what should we do here?
>>>
>>> I guess we should just drop the hack. We'll have to at some point
>>> anyway. But I guess we should also find a way to tweak the distro
>>> bootcmd at boot time to search for the medium that we booted on first.
>>>
>>> I'm not really sure how to do this though.
>>
>> Well in that case let's drop the hack and someone will pick it up when
>> it hits them.
>>
>> Regards,
>> Simon
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Re: [U-Boot] [PATCH 10/14] dm: mmc: sunxi: Add support for driver model

[Maxime Ripard]

On Thu, Jul 27, 2017 at 10:19:44PM -0600, Simon Glass wrote:
> Hi Maxime,
> 
> On 17 July 2017 at 03:26, Maxime Ripard
>  wrote:
> > Hi Simon,
> >
> > On Fri, Jul 14, 2017 at 07:47:45AM -0600, Simon Glass wrote:
> >> On 5 July 2017 at 14:14, Maxime Ripard  
> >> wrote:
> >> > On Wed, Jul 05, 2017 at 04:57:40PM +0200, Maxime Ripard wrote:
> >> >> On Tue, Jul 04, 2017 at 01:33:25PM -0600, Simon Glass wrote:
> >> >> > Hi Maxime,
> >> >> >
> >> >> > On 21 June 2017 at 01:31, Maxime Ripard
> >> >> >  wrote:
> >> >> > > Hi Simon,
> >> >> > >
> >> >> > > On Mon, Jun 19, 2017 at 11:11:27AM -0600, Simon Glass wrote:
> >> >> > >> Add a driver-model version of this driver which mostly uses the 
> >> >> > >> existing
> >> >> > >> code. The old code can be removed once all boards are switched 
> >> >> > >> over.
> >> >> > >>
> >> >> > >> Signed-off-by: Simon Glass 
> >> >> > >
> >> >> > > I'm not sure if you tested that, but we have some code that switches
> >> >> > > the MMC indices when using both an eMMC and an external MMC.
> >> >> > >
> >> >> > > http://git.denx.de/?p=u-boot.git;a=blob;f=board/sunxi/board.c#l494
> >> >> > >
> >> >> > > This predates my time, but it seems that it was done to have a
> >> >> > > consistent boot MMC device ID.
> >> >> > >
> >> >> > > I'm not really sure we can get rid of it (even if it creates some
> >> >> > > issues of it's own), but what would be the impact of a switch to the
> >> >> > > device model on that logic?
> >> >> >
> >> >> > That is a pretty terrible hack.
> >> >>
> >> >> Yes, I know. This is especially bad when used together with other
> >> >> tools that rely on one MMC index for example (such as fastboot).
> >> >>
> >> >> I wanted to kill it for quite some time, but I'm a bit reluctant due
> >> >> to the possible side effects.
> >> >>
> >> >> > I'm not sure whether it will continue to work with DM. It does still
> >> >> > use the device number in the block device, so maybe...  Do you have
> >> >> > a board would use this?
> >> >>
> >> >> I guess I do. I'll give it a try or tonight and let you know.
> >> >
> >> > I just tested. Even with an eMMC (which was the first use case for
> >> > that hack), it works, even things that are not mainline yet (fastboot,
> >> > etc).
> >> >
> >> > It obviously break the old scripts relying on the mmc index, but I
> >> > guess that's ok.
> >> >
> >> > There's one regression though. Our eMMC will always be the second one,
> >> > which means that the distro bootargs will always boot on the external
> >> > SD first (which is always going to be mmc0).
> >> >
> >> > That's due to the fact that the eMMC controller is the third one, and
> >> > is thus probed last. We obviously want something deterministic for
> >> > fastboot for example, but booting partitions of the media you started
> >> > from make sense I guess. And this is what this hack was trying to
> >> > address.
> >>
> >> OK...so what should we do here?
> >
> > I guess we should just drop the hack. We'll have to at some point
> > anyway. But I guess we should also find a way to tweak the distro
> > bootcmd at boot time to search for the medium that we booted on first.
> >
> > I'm not really sure how to do this though.
> 
> Well in that case let's drop the hack and someone will pick it up when
> it hits them.

That works for me.

Maxime

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Re: [U-Boot] [PATCH 10/14] dm: mmc: sunxi: Add support for driver model

[Simon Glass]

Hi Maxime,

On 17 July 2017 at 03:26, Maxime Ripard
 wrote:
> Hi Simon,
>
> On Fri, Jul 14, 2017 at 07:47:45AM -0600, Simon Glass wrote:
>> On 5 July 2017 at 14:14, Maxime Ripard  
>> wrote:
>> > On Wed, Jul 05, 2017 at 04:57:40PM +0200, Maxime Ripard wrote:
>> >> On Tue, Jul 04, 2017 at 01:33:25PM -0600, Simon Glass wrote:
>> >> > Hi Maxime,
>> >> >
>> >> > On 21 June 2017 at 01:31, Maxime Ripard
>> >> >  wrote:
>> >> > > Hi Simon,
>> >> > >
>> >> > > On Mon, Jun 19, 2017 at 11:11:27AM -0600, Simon Glass wrote:
>> >> > >> Add a driver-model version of this driver which mostly uses the 
>> >> > >> existing
>> >> > >> code. The old code can be removed once all boards are switched over.
>> >> > >>
>> >> > >> Signed-off-by: Simon Glass 
>> >> > >
>> >> > > I'm not sure if you tested that, but we have some code that switches
>> >> > > the MMC indices when using both an eMMC and an external MMC.
>> >> > >
>> >> > > http://git.denx.de/?p=u-boot.git;a=blob;f=board/sunxi/board.c#l494
>> >> > >
>> >> > > This predates my time, but it seems that it was done to have a
>> >> > > consistent boot MMC device ID.
>> >> > >
>> >> > > I'm not really sure we can get rid of it (even if it creates some
>> >> > > issues of it's own), but what would be the impact of a switch to the
>> >> > > device model on that logic?
>> >> >
>> >> > That is a pretty terrible hack.
>> >>
>> >> Yes, I know. This is especially bad when used together with other
>> >> tools that rely on one MMC index for example (such as fastboot).
>> >>
>> >> I wanted to kill it for quite some time, but I'm a bit reluctant due
>> >> to the possible side effects.
>> >>
>> >> > I'm not sure whether it will continue to work with DM. It does still
>> >> > use the device number in the block device, so maybe...  Do you have
>> >> > a board would use this?
>> >>
>> >> I guess I do. I'll give it a try or tonight and let you know.
>> >
>> > I just tested. Even with an eMMC (which was the first use case for
>> > that hack), it works, even things that are not mainline yet (fastboot,
>> > etc).
>> >
>> > It obviously break the old scripts relying on the mmc index, but I
>> > guess that's ok.
>> >
>> > There's one regression though. Our eMMC will always be the second one,
>> > which means that the distro bootargs will always boot on the external
>> > SD first (which is always going to be mmc0).
>> >
>> > That's due to the fact that the eMMC controller is the third one, and
>> > is thus probed last. We obviously want something deterministic for
>> > fastboot for example, but booting partitions of the media you started
>> > from make sense I guess. And this is what this hack was trying to
>> > address.
>>
>> OK...so what should we do here?
>
> I guess we should just drop the hack. We'll have to at some point
> anyway. But I guess we should also find a way to tweak the distro
> bootcmd at boot time to search for the medium that we booted on first.
>
> I'm not really sure how to do this though.

Well in that case let's drop the hack and someone will pick it up when
it hits them.

Regards,
Simon
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Re: [U-Boot] [PATCH 10/14] dm: mmc: sunxi: Add support for driver model

[Maxime Ripard]

Hi Simon,

On Fri, Jul 14, 2017 at 07:47:45AM -0600, Simon Glass wrote:
> On 5 July 2017 at 14:14, Maxime Ripard  
> wrote:
> > On Wed, Jul 05, 2017 at 04:57:40PM +0200, Maxime Ripard wrote:
> >> On Tue, Jul 04, 2017 at 01:33:25PM -0600, Simon Glass wrote:
> >> > Hi Maxime,
> >> >
> >> > On 21 June 2017 at 01:31, Maxime Ripard
> >> >  wrote:
> >> > > Hi Simon,
> >> > >
> >> > > On Mon, Jun 19, 2017 at 11:11:27AM -0600, Simon Glass wrote:
> >> > >> Add a driver-model version of this driver which mostly uses the 
> >> > >> existing
> >> > >> code. The old code can be removed once all boards are switched over.
> >> > >>
> >> > >> Signed-off-by: Simon Glass 
> >> > >
> >> > > I'm not sure if you tested that, but we have some code that switches
> >> > > the MMC indices when using both an eMMC and an external MMC.
> >> > >
> >> > > http://git.denx.de/?p=u-boot.git;a=blob;f=board/sunxi/board.c#l494
> >> > >
> >> > > This predates my time, but it seems that it was done to have a
> >> > > consistent boot MMC device ID.
> >> > >
> >> > > I'm not really sure we can get rid of it (even if it creates some
> >> > > issues of it's own), but what would be the impact of a switch to the
> >> > > device model on that logic?
> >> >
> >> > That is a pretty terrible hack.
> >>
> >> Yes, I know. This is especially bad when used together with other
> >> tools that rely on one MMC index for example (such as fastboot).
> >>
> >> I wanted to kill it for quite some time, but I'm a bit reluctant due
> >> to the possible side effects.
> >>
> >> > I'm not sure whether it will continue to work with DM. It does still
> >> > use the device number in the block device, so maybe...  Do you have
> >> > a board would use this?
> >>
> >> I guess I do. I'll give it a try or tonight and let you know.
> >
> > I just tested. Even with an eMMC (which was the first use case for
> > that hack), it works, even things that are not mainline yet (fastboot,
> > etc).
> >
> > It obviously break the old scripts relying on the mmc index, but I
> > guess that's ok.
> >
> > There's one regression though. Our eMMC will always be the second one,
> > which means that the distro bootargs will always boot on the external
> > SD first (which is always going to be mmc0).
> >
> > That's due to the fact that the eMMC controller is the third one, and
> > is thus probed last. We obviously want something deterministic for
> > fastboot for example, but booting partitions of the media you started
> > from make sense I guess. And this is what this hack was trying to
> > address.
> 
> OK...so what should we do here?

I guess we should just drop the hack. We'll have to at some point
anyway. But I guess we should also find a way to tweak the distro
bootcmd at boot time to search for the medium that we booted on first.

I'm not really sure how to do this though.

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com


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Re: [U-Boot] [PATCH 10/14] dm: mmc: sunxi: Add support for driver model

[Simon Glass]

Hi Maxime,

On 5 July 2017 at 14:14, Maxime Ripard  wrote:
> On Wed, Jul 05, 2017 at 04:57:40PM +0200, Maxime Ripard wrote:
>> On Tue, Jul 04, 2017 at 01:33:25PM -0600, Simon Glass wrote:
>> > Hi Maxime,
>> >
>> > On 21 June 2017 at 01:31, Maxime Ripard
>> >  wrote:
>> > > Hi Simon,
>> > >
>> > > On Mon, Jun 19, 2017 at 11:11:27AM -0600, Simon Glass wrote:
>> > >> Add a driver-model version of this driver which mostly uses the existing
>> > >> code. The old code can be removed once all boards are switched over.
>> > >>
>> > >> Signed-off-by: Simon Glass 
>> > >
>> > > I'm not sure if you tested that, but we have some code that switches
>> > > the MMC indices when using both an eMMC and an external MMC.
>> > >
>> > > http://git.denx.de/?p=u-boot.git;a=blob;f=board/sunxi/board.c#l494
>> > >
>> > > This predates my time, but it seems that it was done to have a
>> > > consistent boot MMC device ID.
>> > >
>> > > I'm not really sure we can get rid of it (even if it creates some
>> > > issues of it's own), but what would be the impact of a switch to the
>> > > device model on that logic?
>> >
>> > That is a pretty terrible hack.
>>
>> Yes, I know. This is especially bad when used together with other
>> tools that rely on one MMC index for example (such as fastboot).
>>
>> I wanted to kill it for quite some time, but I'm a bit reluctant due
>> to the possible side effects.
>>
>> > I'm not sure whether it will continue to work with DM. It does still
>> > use the device number in the block device, so maybe...  Do you have
>> > a board would use this?
>>
>> I guess I do. I'll give it a try or tonight and let you know.
>
> I just tested. Even with an eMMC (which was the first use case for
> that hack), it works, even things that are not mainline yet (fastboot,
> etc).
>
> It obviously break the old scripts relying on the mmc index, but I
> guess that's ok.
>
> There's one regression though. Our eMMC will always be the second one,
> which means that the distro bootargs will always boot on the external
> SD first (which is always going to be mmc0).
>
> That's due to the fact that the eMMC controller is the third one, and
> is thus probed last. We obviously want something deterministic for
> fastboot for example, but booting partitions of the media you started
> from make sense I guess. And this is what this hack was trying to
> address.

OK...so what should we do here?

Regards,
Simon
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Re: [U-Boot] [PATCH 10/14] dm: mmc: sunxi: Add support for driver model

[Maxime Ripard]

On Wed, Jul 05, 2017 at 04:57:40PM +0200, Maxime Ripard wrote:
> On Tue, Jul 04, 2017 at 01:33:25PM -0600, Simon Glass wrote:
> > Hi Maxime,
> > 
> > On 21 June 2017 at 01:31, Maxime Ripard
> >  wrote:
> > > Hi Simon,
> > >
> > > On Mon, Jun 19, 2017 at 11:11:27AM -0600, Simon Glass wrote:
> > >> Add a driver-model version of this driver which mostly uses the existing
> > >> code. The old code can be removed once all boards are switched over.
> > >>
> > >> Signed-off-by: Simon Glass 
> > >
> > > I'm not sure if you tested that, but we have some code that switches
> > > the MMC indices when using both an eMMC and an external MMC.
> > >
> > > http://git.denx.de/?p=u-boot.git;a=blob;f=board/sunxi/board.c#l494
> > >
> > > This predates my time, but it seems that it was done to have a
> > > consistent boot MMC device ID.
> > >
> > > I'm not really sure we can get rid of it (even if it creates some
> > > issues of it's own), but what would be the impact of a switch to the
> > > device model on that logic?
> > 
> > That is a pretty terrible hack.
> 
> Yes, I know. This is especially bad when used together with other
> tools that rely on one MMC index for example (such as fastboot).
> 
> I wanted to kill it for quite some time, but I'm a bit reluctant due
> to the possible side effects.
> 
> > I'm not sure whether it will continue to work with DM. It does still
> > use the device number in the block device, so maybe...  Do you have
> > a board would use this?
> 
> I guess I do. I'll give it a try or tonight and let you know.

I just tested. Even with an eMMC (which was the first use case for
that hack), it works, even things that are not mainline yet (fastboot,
etc).

It obviously break the old scripts relying on the mmc index, but I
guess that's ok.

There's one regression though. Our eMMC will always be the second one,
which means that the distro bootargs will always boot on the external
SD first (which is always going to be mmc0).

That's due to the fact that the eMMC controller is the third one, and
is thus probed last. We obviously want something deterministic for
fastboot for example, but booting partitions of the media you started
from make sense I guess. And this is what this hack was trying to
address.

Maxime

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Embedded Linux and Kernel engineering
http://free-electrons.com


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Re: [U-Boot] [PATCH 10/14] dm: mmc: sunxi: Add support for driver model

[Maxime Ripard]

On Tue, Jul 04, 2017 at 01:33:25PM -0600, Simon Glass wrote:
> Hi Maxime,
> 
> On 21 June 2017 at 01:31, Maxime Ripard
>  wrote:
> > Hi Simon,
> >
> > On Mon, Jun 19, 2017 at 11:11:27AM -0600, Simon Glass wrote:
> >> Add a driver-model version of this driver which mostly uses the existing
> >> code. The old code can be removed once all boards are switched over.
> >>
> >> Signed-off-by: Simon Glass 
> >
> > I'm not sure if you tested that, but we have some code that switches
> > the MMC indices when using both an eMMC and an external MMC.
> >
> > http://git.denx.de/?p=u-boot.git;a=blob;f=board/sunxi/board.c#l494
> >
> > This predates my time, but it seems that it was done to have a
> > consistent boot MMC device ID.
> >
> > I'm not really sure we can get rid of it (even if it creates some
> > issues of it's own), but what would be the impact of a switch to the
> > device model on that logic?
> 
> That is a pretty terrible hack.

Yes, I know. This is especially bad when used together with other
tools that rely on one MMC index for example (such as fastboot).

I wanted to kill it for quite some time, but I'm a bit reluctant due
to the possible side effects.

> I'm not sure whether it will continue to work with DM. It does still
> use the device number in the block device, so maybe...  Do you have
> a board would use this?

I guess I do. I'll give it a try or tonight and let you know.

Maxime

-- 
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Embedded Linux and Kernel engineering
http://free-electrons.com


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Re: [U-Boot] [PATCH 10/14] dm: mmc: sunxi: Add support for driver model

[Simon Glass]

Hi Maxime,

On 21 June 2017 at 01:31, Maxime Ripard
 wrote:
> Hi Simon,
>
> On Mon, Jun 19, 2017 at 11:11:27AM -0600, Simon Glass wrote:
>> Add a driver-model version of this driver which mostly uses the existing
>> code. The old code can be removed once all boards are switched over.
>>
>> Signed-off-by: Simon Glass 
>
> I'm not sure if you tested that, but we have some code that switches
> the MMC indices when using both an eMMC and an external MMC.
>
> http://git.denx.de/?p=u-boot.git;a=blob;f=board/sunxi/board.c#l494
>
> This predates my time, but it seems that it was done to have a
> consistent boot MMC device ID.
>
> I'm not really sure we can get rid of it (even if it creates some
> issues of it's own), but what would be the impact of a switch to the
> device model on that logic?

That is a pretty terrible hack. I'm not sure whether it will continue
to work with DM. It does still use the device number in the block
device, so maybe...  Do you have a board would use this?

Regards,
Simon
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Re: [U-Boot] [PATCH 10/14] dm: mmc: sunxi: Add support for driver model

[Maxime Ripard]

Hi Simon,

On Mon, Jun 19, 2017 at 11:11:27AM -0600, Simon Glass wrote:
> Add a driver-model version of this driver which mostly uses the existing
> code. The old code can be removed once all boards are switched over.
> 
> Signed-off-by: Simon Glass 

I'm not sure if you tested that, but we have some code that switches
the MMC indices when using both an eMMC and an external MMC.

http://git.denx.de/?p=u-boot.git;a=blob;f=board/sunxi/board.c#l494

This predates my time, but it seems that it was done to have a
consistent boot MMC device ID.

I'm not really sure we can get rid of it (even if it creates some
issues of it's own), but what would be the impact of a switch to the
device model on that logic?

Thanks,
Maxime

-- 
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Embedded Linux and Kernel engineering
http://free-electrons.com


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