RE: [PATCH 1/7] drm/exynos: move hdmiphy related code to hdmiphy driver

* RE: [PATCH 1/7] drm/exynos: move hdmiphy related code to hdmiphy driver
       [not found]                             ` <CAPdUM4PpFbc9utAsHnqyF9OJdipdgq036fqFM_SeG0O+M3N5jA@mail.gmail.com>
@ 2013-09-16 12:40                               ` Inki Dae
  2013-09-27  4:53                                 ` Rahul Sharma
  0 siblings, 1 reply; 9+ messages in thread
From: Inki Dae @ 2013-09-16 12:40 UTC (permalink / raw)
  To: 'Rahul Sharma', 'Sean Paul'
  Cc: 'Rahul Sharma', 'linux-samsung-soc',
	'dri-devel', 'kgene.kim', 'sw0312.kim',
	'Lucas Stach', 'Tomasz Figa',
	'Sylwester Nawrocki', 'sunil joshi',
	'Shirish S', devicetree

CCing devicetree,

> -----Original Message-----
> From: Rahul Sharma [mailto:r.sh.open@gmail.com]
> Sent: Tuesday, September 10, 2013 5:28 PM
> To: Sean Paul
> Cc: Inki Dae; Rahul Sharma; linux-samsung-soc; dri-devel; kgene.kim;
> sw0312.kim; Lucas Stach; Tomasz Figa; Sylwester Nawrocki; sunil joshi;
> Shirish S
> Subject: Re: [PATCH 1/7] drm/exynos: move hdmiphy related code to hdmiphy
> driver
> 
> On 6 September 2013 19:21, Sean Paul <seanpaul@chromium.org> wrote:
> > On Thu, Sep 5, 2013 at 11:37 PM, Rahul Sharma <r.sh.open@gmail.com>
> wrote:
> >> On 5 September 2013 19:20, Inki Dae <inki.dae@samsung.com> wrote:
> >>>
> >>>
> >>>> -----Original Message-----
> >>>> From: Sean Paul [mailto:seanpaul@chromium.org]
> >>>> Sent: Thursday, September 05, 2013 10:20 PM
> >>>> To: Inki Dae
> >>>> Cc: Rahul Sharma; Rahul Sharma; linux-samsung-soc; dri-devel;
> kgene.kim;
> >>>> sw0312.kim; Lucas Stach; Tomasz Figa; Sylwester Nawrocki; sunil
joshi;
> >>>> Shirish S
> >>>> Subject: Re: [PATCH 1/7] drm/exynos: move hdmiphy related code to
> hdmiphy
> >>>> driver
> >>>>
> >>>> On Thu, Sep 5, 2013 at 2:19 AM, Inki Dae <inki.dae@samsung.com>
wrote:
> >>>> >
> >>>> >
> >>>> >> -----Original Message-----
> >>>> >> From: linux-samsung-soc-owner@vger.kernel.org [mailto:linux-
> samsung-
> >>>> soc-
> >>>> >> owner@vger.kernel.org] On Behalf Of Rahul Sharma
> >>>> >> Sent: Thursday, September 05, 2013 3:04 PM
> >>>> >> To: Inki Dae
> >>>> >> Cc: Sean Paul; Rahul Sharma; linux-samsung-soc; dri-devel;
> kgene.kim;
> >>>> >> sw0312.kim; Lucas Stach; Tomasz Figa; Sylwester Nawrocki; sunil
> joshi;
> >>>> >> Shirish S
> >>>> >> Subject: Re: [PATCH 1/7] drm/exynos: move hdmiphy related code to
> >>>> hdmiphy
> >>>> >> driver
> >>>> >>
> >>>> >> On 5 September 2013 10:52, Inki Dae <inki.dae@samsung.com> wrote:
> >>>> >> >> >> >> >> +static struct hdmiphy_config hdmiphy_4210_configs[] =
> {
> >>>> >> >> >> >> >> +       {
> >>>> >> >> >> >> >> +               .pixel_clock = 27000000,
> >>>> >> >> >> >> >> +               .conf = {
> >>>> >> >> >> >> >> +                       0x01, 0x05, 0x00, 0xD8, 0x10,
0x1C,
> >>>> > 0x30,
> >>>> >> >> > 0x40,
> >>>> >> >> >> >> >> +                       0x6B, 0x10, 0x02, 0x51, 0xDF,
0xF2,
> >>>> > 0x54,
> >>>> >> >> > 0x87,
> >>>> >> >> >> >> >> +                       0x84, 0x00, 0x30, 0x38, 0x00,
0x08,
> >>>> > 0x10,
> >>>> >> >> > 0xE0,
> >>>> >> >> >> >> >> +                       0x22, 0x40, 0xE3, 0x26, 0x00,
0x00,
> >>>> > 0x00,
> >>>> >> >> > 0x00,
> >>>> >> >> >> >> >> +               },
> >>>> >> >> >> >> >> +       },
> >>>> >> >> >> >> >> +       {
> >>>> >> >> >> >> >> +               .pixel_clock = 27027000,
> >>>> >> >> >> >> >> +               .conf = {
> >>>> >> >> >> >> >> +                       0x01, 0x05, 0x00, 0xD4, 0x10,
0x9C,
> >>>> > 0x09,
> >>>> >> >> > 0x64,
> >>>> >> >> >> >> >> +                       0x6B, 0x10, 0x02, 0x51, 0xDF,
0xF2,
> >>>> > 0x54,
> >>>> >> >> > 0x87,
> >>>> >> >> >> >> >> +                       0x84, 0x00, 0x30, 0x38, 0x00,
0x08,
> >>>> > 0x10,
> >>>> >> >> > 0xE0,
> >>>> >> >> >> >> >> +                       0x22, 0x40, 0xE3, 0x26, 0x00,
0x00,
> >>>> > 0x00,
> >>>> >> >> > 0x00,
> >>>> >> >> >> >> >> +               },
> >>>> >> >> >> >> >> +       },
> >>>> >> >> >> >> >> +       {
> >>>> >> >> >> >> >> +               .pixel_clock = 74176000,
> >>>> >> >> >> >> >> +               .conf = {
> >>>> >> >> >> >> >> +                       0x01, 0x05, 0x00, 0xD8, 0x10,
0x9C,
> >>>> > 0xef,
> >>>> >> >> > 0x5B,
> >>>> >> >> >> >> >> +                       0x6D, 0x10, 0x01, 0x51, 0xef,
0xF3,
> >>>> > 0x54,
> >>>> >> >> > 0xb9,
> >>>> >> >> >> >> >> +                       0x84, 0x00, 0x30, 0x38, 0x00,
0x08,
> >>>> > 0x10,
> >>>> >> >> > 0xE0,
> >>>> >> >> >> >> >> +                       0x22, 0x40, 0xa5, 0x26, 0x01,
0x00,
> >>>> > 0x00,
> >>>> >> >> > 0x00,
> >>>> >> >> >> >> >> +               },
> >>>> >> >> >> >> >> +       },
> >>>> >> >> >> >> >> +       {
> >>>> >> >> >> >> >> +               .pixel_clock = 74250000,
> >>>> >> >> >> >> >> +               .conf = {
> >>>> >> >> >> >> >> +                       0x01, 0x05, 0x00, 0xd8, 0x10,
0x9c,
> >>>> > 0xf8,
> >>>> >> >> > 0x40,
> >>>> >> >> >> >> >> +                       0x6a, 0x10, 0x01, 0x51, 0xff,
0xf1,
> >>>> > 0x54,
> >>>> >> >> > 0xba,
> >>>> >> >> >> >> >> +                       0x84, 0x00, 0x10, 0x38, 0x00,
0x08,
> >>>> > 0x10,
> >>>> >> >> > 0xe0,
> >>>> >> >> >> >> >> +                       0x22, 0x40, 0xa4, 0x26, 0x01,
0x00,
> >>>> > 0x00,
> >>>> >> >> > 0x00,
> >>>> >> >> >> >> >> +               },
> >>>> >> >> >> >> >> +       },
> >>>> >> >> >> >> >> +       {
> >>>> >> >> >> >> >> +               .pixel_clock = 148500000,
> >>>> >> >> >> >> >> +               .conf = {
> >>>> >> >> >> >> >> +                       0x01, 0x05, 0x00, 0xD8, 0x10,
0x9C,
> >>>> > 0xf8,
> >>>> >> >> > 0x40,
> >>>> >> >> >> >> >> +                       0x6A, 0x18, 0x00, 0x51, 0xff,
0xF1,
> >>>> > 0x54,
> >>>> >> >> > 0xba,
> >>>> >> >> >> >> >> +                       0x84, 0x00, 0x10, 0x38, 0x00,
0x08,
> >>>> > 0x10,
> >>>> >> >> > 0xE0,
> >>>> >> >> >> >> >> +                       0x22, 0x40, 0xa4, 0x26, 0x02,
0x00,
> >>>> > 0x00,
> >>>> >> >> > 0x00,
> >>>> >> >> >> >> >> +               },
> >>>> >> >> >> >> >> +       },
> >>>> >> >> >> >> >> +};
> >>>> >> >> >> >> >> +
> >>>> >> >> >> >> >
> >>>> >> >> >> >> > Are you aware of the effort to move these to dt? Since
> these
> >>>> >> are
> >>>> >> >> >> >> > board-specific values, it seems incorrect to apply them
> >>>> >> >> universally.
> >>>> >> >> >> >> > Shirish has uploaded a patch to the chromium review
> site to
> >>>> >> push
> >>>> >> >> >> these
> >>>> >> >> >> >> > into dt
> >>> (https://chromium-review.googlesource.com/#/c/65581).
> >>>> >> >> Maybe
> >>>> >> >> >> >> > you can work that into your patch set?
> >>>> >> >> >> >> >
> >>>> >> >> >> >
> >>>> >> >> >> > Are these really board-specific values?
> >>>> >> >> >>
> >>>> >> >> >> According to your hardware people:
> >>>> >> >> >>
> >>>> >> >> >> "If the signal pattern doesn't change for new board, the phy
> >>>> setting
> >>>> >> >> >> is same as the current board. But if changed, you need to
> confirm
> >>>> >> with
> >>>> >> >> >> measurement of signals, because it may vary slightly by
> >>>> resistance
> >>>> >> of
> >>>> >> >> >> board pattern"
> >>>> >> >> >>
> >>>> >> >> >
> >>>> >> >> > Right. it seems that the phy configuration should be adjusted
> >>>> >> according
> >>>> >> >> to
> >>>> >> >> > PCB environment: OSC clock rate, 24MHz or 27MHz, could be
> decided
> >>>> by
> >>>> >> PCB
> >>>> >> >> > even though most PCBs use 27MHz.
> >>>> >> >> >
> >>>> >> >> >> That indicates to me that we might need to tweak these on a
> per-
> >>>> >> board
> >>>> >> >> >> basis.
> >>>> >> >> >>
> >>>> >> >> >> In the 5420 datasheet, there are a few register descriptions
> >>>> >> available
> >>>> >> >> >> for the phy. 0x145D0004 is CLK_SEL which seems like it would
> be
> >>>> >> >> >> board-specific, same with TX_* registers.
> >>>> >> >> >>
> >>>> >> >> >
> >>>> >> >> > And we can select HDMI Tx PHY internal PLL input clock by
> setting
> >>>> >> >> CLK_SEL.
> >>>> >> >> > Ok, Shirish's patch set is reasonable to me. However, that
> patch
> >>>> set
> >>>> >> >> should
> >>>> >> >> > be rebased on top of Rahul's patch set. Shirish and Rahul,
> please
> >>>> re-
> >>>> >> >> post
> >>>> >> >> > your patch set after discussing how to rebase these patch
set.
> >>>> >> >> >
> >>>> >> >> > Thanks,
> >>>> >> >> > Inki Dae
> >>>> >> >> >
> >>>> >> >>
> >>>> >> >> In that case, we need to test the phy confs for all the exynos
> >>>> boards,
> >>>> >> >> supported in
> >>>> >> >> mainline. Probably needs a analyser as well to precisely
> compare the
> >>>> >> >> deviation.
> >>>> >> >
> >>>> >> > Shirish patch adds phy config data only to arndale and smdk5250
> >>>> boards,
> >>>> >> and
> >>>> >> > these config data should have each board specific values.
> Therefore,
> >>>> for
> >>>> >> > other boards, shouldn't correct phy config data suitable to
> their
> >>>> boards
> >>>> >> be
> >>>> >> > added to their board dts files? Is the above analyzer really
> needed?
> >>>> >> >
> >>>> >>
> >>>> >> Sorry, I had only seen his patches for chromium tree. In mainline
> >>>> >> version, he added for 5250 as well. But both sets (for arndale and
> >>>> >> smdk) are exactly same as original 5250 configs which also works
> >>>> >> with 4412 origen.
> >>>> >>
> >>>> >> Some problem has been identified during conformance testing for
> >>>> >> 5420 peach board, which happens with analyser. It was always
> >>>> >> working fine on the TV sets that I have. @Shirish/Sean please
> >>>> >> correct me if wrong.
> >>>> >>
> >>>> >> >> Shirish patch is only for 5420 Peach board. Else, to start with
> we
> >>>> can
> >>>> >> >> mark
> >>>> >> >> phyconf as optional property which overrides the default Phy
> Confs
> >>>> for
> >>>> >> >> given SoC.
> >>>> >> >
> >>>> >> > Hm.... you mean that hdmiphy driver use the default phy config
> data
> >>>> in
> >>>> >> > driver; most boards use the same data, and only in special case;
> a
> >>>> board
> >>>> >> > uses different OSC clock rate, the hdmiphy driver use phy config
> data
> >>>> >> from
> >>>> >> > dts file checking hdmiphy-confs property?
> >>>> >> >
> >>>> >>
> >>>> >> Yes. I meant same. I don't see the real need to duplicate so much
> >>>> >> of data in all board dts files. We can add it for a particular
> board,
> >>>> if
> >>>> >> really required.
> >>>> >>
> >>>> >
> >>>> > Yes, reasonable to me. It's not good that board dts files have same
> phy
> >>>> > config data. How about using the phy config data from dts file if
> >>>> > hdmiphy-confs property exists, otherwise using default phy config
> data
> >>>> then?
> >>>> > This means that we don't need to remove the phy config data from
> driver;
> >>>> > that will be used as default values.
> >>>> >
> >>>>
> >>>> Can you add the "default" configs to exynos5250.dtsi and
> >>>> exynos5420.dtsi, then overwrite it in the board file if it needs to
> be
> >>>> different?
> >>>>
> >>
> >> This will still introduce some duplication as 4412 and 5250 share same
> >> phy confs and have no common dtsi. Similar situation can arise for
> later
> >> SoCs in exynos series.
> >>
> >>>
> >>> Good idea but how about adding default-hdmiphy-config property to each
> board
> >>> dts file and removing phy config data from board dts file if they are
> same
> >>> as default one of driver? With this, hdmiphy driver checks if
> >>> default-hdmiphy-config property exists, and then use default config
> data if
> >>> exists. And if not exists, hdmiphy driver gets and uses board specific
> phy
> >>> config data from board dts file.
> >>> And it seems that the phy config values of Shirish's patch set are
> same as
> >>> default ones of driver. So we can remove the phy config data from each
> board
> >>> dts files and add default-hdmiphy-config property to there so that
> default
> >>> data of driver can be used.
> >>>
> >>>
> >>> Thanks,
> >>> Inki Dae
> >>>
> >>
> >> We can simplify it further by letting the driver use phy-conf
> >> property from DT. If phy-conf property is not available switch to
> >> default confs, provided in the driver. This way we don't need to add
> >> default-hdmiphy-config property to all board files.
> >>
> >
> > This is probably a worthwhile discussion to have on Shirish's patch
> > with devicetree-discuss. I'm unsure which is the preferred way to do
> > something like this.
> 
> I agree.
> 
> Shall we keep those patches for "phy conf from DT" independent to this
> series? Until this phy separation patches get merged, hdmi will remain
> broken for 5250 and 5420.
> 

Sorry for being late. I was so busy.

I have pondered over whether we should use default phy config values of
driver or not. My opinion is that we need to keep the default phy config
values in dts file because the values couldn't be used as default for all
boards: the default means that all boards should work well with the default
values, but wouldn't work. Therefore, the default values we are discussing
are specific to some boards even though most boards work well with the
values.

So I tend to agree with Sean Paul. Let's just add the default phy config
values to each board dts file that works well even though the values are
duplicated. For this, Rahul, we could rebase your patch set on top of
Shirish's patch.

Other opinions?

Thanks,
Inki Dae

> regards,
> Rahul Sharma.
> 
> >
> > Sean
> >
> >> The number of exceptions where we need to override the default confs
> >> is zero (as if now). 5420 based Peach and Smdk boards work exactly
> >> the same with same set of phy confs on 3 hdmi displays, I have. It
> >> may differ on Analyser. IMO we can defer this part till we have
> >> unacceptable analyser results for any specific board.
> >>
> >> Regards,
> >> Rahul Sharma.
> >>
> >>>> Sean
> >>>>
> >>>>
> >>>>
> >>>> > Rahul, let's go if there is other opinion. we SHOULD MERGE these
> this
> >>>> > time.:)
> >>>> >
> >>>> > Thanks,
> >>>> > Inki Dae
> >>>> >
> >>>> >> Regards,
> >>>> >> Rahul Sharma.
> >>>> >>
> >>>> >> >
> >>>> >> >>
> >>>> >> >> regards,
> >>>> >> >> Rahul Sharma.
> >>>> >> >>
> >>>> >> >> >> Sean
> >>>> >> >> >>
> >>>> >> >> >>
> >>>> >> >
> >>>> >> --
> >>>> >> To unsubscribe from this list: send the line "unsubscribe linux-
> >>>> samsung-
> >>>> >> soc" in
> >>>> >> the body of a message to majordomo@vger.kernel.org
> >>>> >> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> >>>> >
> >>>

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