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Message-ID: <CAJMQK-hGrNAu-kf6sf_oF+B+63JtDz57+JXSd_w87LqSER+hhw@mail.gmail.com>
Date: Thu, 2 Nov 2023 14:34:14 -0700
From: Hsin-Yi Wang <hsinyi@...omium.org>
To: Doug Anderson <dianders@...omium.org>
Cc: Neil Armstrong <neil.armstrong@...aro.org>,
Jessica Zhang <quic_jesszhan@...cinc.com>,
Sam Ravnborg <sam@...nborg.org>,
Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
Maxime Ripard <mripard@...nel.org>,
Thomas Zimmermann <tzimmermann@...e.de>,
David Airlie <airlied@...il.com>,
Daniel Vetter <daniel@...ll.ch>,
dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] drm/panel-edp: Add several generic edp panels
On Thu, Nov 2, 2023 at 9:54 AM Doug Anderson <dianders@...omium.org> wrote:
>
> Hi,
>
> On Wed, Nov 1, 2023 at 2:26 PM Hsin-Yi Wang <hsinyi@...omium.org> wrote:
> >
> > Add a few generic edp panels used by mt8186 chromebooks.
> > Besides, modify the following panel:
> > - AUO 0x235c B116XTN02 renamed to B116XTN02.3.
> > - AUO 0x405c B116XAK01 adjust the timing to delay_200_500_e50. According
> > to the datasheet: T3=200, T12=500, T7_max = 50.
>
> Can you modify this in the `auo_b116xak01` structure? That should make
> timing work more correctly for anyone directly specifying this panel.
> The reason I had it point to the other structure was so we didn't
> treat anyone specifying this panel directly differently than anyone
> autodetecting it...
>
Will modify in v2.
>
> > Signed-off-by: Hsin-Yi Wang <hsinyi@...omium.org>
> > ---
> > drivers/gpu/drm/panel/panel-edp.c | 62 ++++++++++++++++++++++++++++++-
> > 1 file changed, 60 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/panel/panel-edp.c b/drivers/gpu/drm/panel/panel-edp.c
> > index 9dce4c702414..06ce3a73d740 100644
> > --- a/drivers/gpu/drm/panel/panel-edp.c
> > +++ b/drivers/gpu/drm/panel/panel-edp.c
> > @@ -1830,6 +1830,12 @@ static const struct panel_delay delay_200_500_e50 = {
> > .enable = 50,
> > };
> >
> > +static const struct panel_delay delay_200_500_e80 = {
> > + .hpd_absent = 200,
> > + .unprepare = 500,
> > + .enable = 80,
> > +};
> > +
> > static const struct panel_delay delay_200_500_e80_d50 = {
> > .hpd_absent = 200,
> > .unprepare = 500,
> > @@ -1849,6 +1855,25 @@ static const struct panel_delay delay_200_500_e200 = {
> > .enable = 200,
> > };
> >
> > +static const struct panel_delay delay_200_500_e200_d10 = {
> > + .hpd_absent = 200,
> > + .unprepare = 500,
> > + .enable = 200,
> > + .disable = 10,
> > +};
> > +
> > +static const struct panel_delay delay_200_150_e50 = {
> > + .hpd_absent = 200,
> > + .unprepare = 150,
>
> I worry a little bit about seeing "unprepare" of 150. It doesn't mean
> it's wrong, but it's been so consistent for me to see .500 here that
> it's good to double-confirm. It looks like you use this one on
> "KD116N2930A15". From the datasheet I see that T12 has a min of 150 ms
> and a max of 500 ms. Is that the same thing you see?
>
> Specifying a "max" for T12 makes no sense. That's saying that it
> violates timing specs to ever turn the panel off for more than half a
> second which is nonsense.
>
> Given that:
> * The spec is obviously nonsense for this number.
> * The 500 ms number is present in the spec and somewhat standard for eDP panels.
> * Having a larger number is safer.
> * 500 ms usually won't have a real world impact since it just prevents
> turning on the panel again right after turning it off (and we use
> autosuspend to avoid this in most cases).
>
> Maybe it's better to just use 500 here?
>
The spec said min = 150 and max = 500.
I'll modify to 500 in v2.
>
> > + .enable = 50,
> > +};
> > +
> > +static const struct panel_delay delay_200_150_e200 = {
> > + .hpd_absent = 200,
> > + .unprepare = 150,
> > + .enable = 200,
>
> Let's look at this unprepare of 150 too. I guess it's used for two panels.
>
> NT116WHM-N21: Wow, there sure are a lot of panels that call themselves
> "NT116WHM-N21" but have different IDs. :-P If you're sure that this is
> 150 this is fine, but if there's any doubt (like above) then 500 is
> safer.
>
> R140NWFM R1: I think I found this spec and yeah, it's super clear. 150 ms.
>
>
> NOTE: I didn't try to double-check any of the other timings, mostly I
> just looked at the unprepare since it stood out. ;-)
>
0x0715 NT116WHM-N21 mentioned T12 >= 150 (no upper bound mentioned).
>
> > +};
> > +
> > #define EDP_PANEL_ENTRY(vend_chr_0, vend_chr_1, vend_chr_2, product_id, _delay, _name) \
> > { \
> > .name = _name, \
> > @@ -1869,38 +1894,71 @@ static const struct edp_panel_entry edp_panels[] = {
> > EDP_PANEL_ENTRY('A', 'U', 'O', 0x145c, &delay_200_500_e50, "B116XAB01.4"),
> > EDP_PANEL_ENTRY('A', 'U', 'O', 0x1e9b, &delay_200_500_e50, "B133UAN02.1"),
> > EDP_PANEL_ENTRY('A', 'U', 'O', 0x1ea5, &delay_200_500_e50, "B116XAK01.6"),
> > - EDP_PANEL_ENTRY('A', 'U', 'O', 0x235c, &delay_200_500_e50, "B116XTN02"),
> > - EDP_PANEL_ENTRY('A', 'U', 'O', 0x405c, &auo_b116xak01.delay, "B116XAK01"),
> > + EDP_PANEL_ENTRY('A', 'U', 'O', 0x208d, &delay_200_500_e50, "B140HTN02.1"),
> > + EDP_PANEL_ENTRY('A', 'U', 'O', 0x235c, &delay_200_500_e50, "B116XTN02.3"),
> > + EDP_PANEL_ENTRY('A', 'U', 'O', 0x239b, &delay_200_500_e50, "B116XAN06.1"),
> > + EDP_PANEL_ENTRY('A', 'U', 'O', 0x255c, &delay_200_500_e50, "B116XTN02.5"),
> > + EDP_PANEL_ENTRY('A', 'U', 'O', 0x403d, &delay_200_500_e50, "B140HAN04.0"),
> > + EDP_PANEL_ENTRY('A', 'U', 'O', 0x405c, &delay_200_500_e50, "B116XAK01.0"),
> > EDP_PANEL_ENTRY('A', 'U', 'O', 0x582d, &delay_200_500_e50, "B133UAN01.0"),
> > EDP_PANEL_ENTRY('A', 'U', 'O', 0x615c, &delay_200_500_e50, "B116XAN06.1"),
> > + EDP_PANEL_ENTRY('A', 'U', 'O', 0x635c, &delay_200_500_e50, "B116XAN06.3"),
> > + EDP_PANEL_ENTRY('A', 'U', 'O', 0x639c, &delay_200_500_e50, "B140HAK02.7"),
> > EDP_PANEL_ENTRY('A', 'U', 'O', 0x8594, &delay_200_500_e50, "B133UAN01.0"),
> > + EDP_PANEL_ENTRY('A', 'U', 'O', 0xf390, &delay_200_500_e50, "B140XTN07.7"),
> >
> > + EDP_PANEL_ENTRY('B', 'O', 'E', 0x0715, &delay_200_150_e200, "NT116WHM-N21"),
> > + EDP_PANEL_ENTRY('B', 'O', 'E', 0x0731, &delay_200_500_e80, "NT116WHM-N42"),
> > + EDP_PANEL_ENTRY('B', 'O', 'E', 0x0741, &delay_200_500_e200, "NT116WHM-N44"),
> > EDP_PANEL_ENTRY('B', 'O', 'E', 0x0786, &delay_200_500_p2e80, "NV116WHM-T01"),
> > EDP_PANEL_ENTRY('B', 'O', 'E', 0x07d1, &boe_nv133fhm_n61.delay, "NV133FHM-N61"),
> > + EDP_PANEL_ENTRY('B', 'O', 'E', 0x07f6, &delay_200_500_e200, "NT140FHM-N44"),
> > EDP_PANEL_ENTRY('B', 'O', 'E', 0x082d, &boe_nv133fhm_n61.delay, "NV133FHM-N62"),
> > + EDP_PANEL_ENTRY('B', 'O', 'E', 0x08b2, &delay_200_500_e200, "NT140WHM-N49"),
> > EDP_PANEL_ENTRY('B', 'O', 'E', 0x09c3, &delay_200_500_e50, "NT116WHM-N21,836X2"),
> > EDP_PANEL_ENTRY('B', 'O', 'E', 0x094b, &delay_200_500_e50, "NT116WHM-N21"),
> > EDP_PANEL_ENTRY('B', 'O', 'E', 0x095f, &delay_200_500_e50, "NE135FBM-N41 v8.1"),
> > EDP_PANEL_ENTRY('B', 'O', 'E', 0x0979, &delay_200_500_e50, "NV116WHM-N49 V8.0"),
> > + EDP_PANEL_ENTRY('B', 'O', 'E', 0x094b, &delay_200_500_e50, "NT116WHM-N21"),
>
> 0x904b is already specified above and this is in the wrong sort order.
>
> > + EDP_PANEL_ENTRY('B', 'O', 'E', 0x0951, &delay_200_500_e80, "NV116WHM-N47"),
>
> Please sort 0x0951 before 0x0979.
>
> > EDP_PANEL_ENTRY('B', 'O', 'E', 0x098d, &boe_nv110wtm_n61.delay, "NV110WTM-N61"),
> > + EDP_PANEL_ENTRY('B', 'O', 'E', 0x09ae, &delay_200_500_e200, "NT140FHM-N45"),
> > EDP_PANEL_ENTRY('B', 'O', 'E', 0x09dd, &delay_200_500_e50, "NT116WHM-N21"),
> > EDP_PANEL_ENTRY('B', 'O', 'E', 0x0a5d, &delay_200_500_e50, "NV116WHM-N45"),
> > EDP_PANEL_ENTRY('B', 'O', 'E', 0x0ac5, &delay_200_500_e50, "NV116WHM-N4C"),
> > + EDP_PANEL_ENTRY('B', 'O', 'E', 0x0b43, &delay_200_500_e200, "NV140FHM-T09"),
> > + EDP_PANEL_ENTRY('B', 'O', 'E', 0x0b56, &delay_200_500_e80, "NT140FHM-N47"),
> > + EDP_PANEL_ENTRY('B', 'O', 'E', 0x0c20, &delay_200_500_e80, "NT140FHM-N47"),
> >
> > + EDP_PANEL_ENTRY('C', 'M', 'N', 0x1132, &delay_200_500_e80_d50, "N116BGE-EA2"),
> > + EDP_PANEL_ENTRY('C', 'M', 'N', 0x1138, &innolux_n116bca_ea1.delay, "N116BCA-EA1-RC4"),
> > EDP_PANEL_ENTRY('C', 'M', 'N', 0x1139, &delay_200_500_e80_d50, "N116BGE-EA2"),
> > EDP_PANEL_ENTRY('C', 'M', 'N', 0x114c, &innolux_n116bca_ea1.delay, "N116BCA-EA1"),
> > + EDP_PANEL_ENTRY('C', 'M', 'N', 0x1145, &delay_200_500_e80_d50, "N116BCN-EB1"),
>
> Please sort 0x1145 above 0x114c
>
> > EDP_PANEL_ENTRY('C', 'M', 'N', 0x1152, &delay_200_500_e80_d50, "N116BCN-EA1"),
> > EDP_PANEL_ENTRY('C', 'M', 'N', 0x1153, &delay_200_500_e80_d50, "N116BGE-EA2"),
> > EDP_PANEL_ENTRY('C', 'M', 'N', 0x1154, &delay_200_500_e80_d50, "N116BCA-EA2"),
> > + EDP_PANEL_ENTRY('C', 'M', 'N', 0x1157, &delay_200_500_e80_d50, "N116BGE-EA2"),
> > + EDP_PANEL_ENTRY('C', 'M', 'N', 0x115b, &delay_200_500_e80_d50, "N116BCN-EB1"),
> > EDP_PANEL_ENTRY('C', 'M', 'N', 0x1247, &delay_200_500_e80_d50, "N120ACA-EA1"),
> > + EDP_PANEL_ENTRY('C', 'M', 'N', 0x142b, &delay_200_500_e80_d50, "N140HCA-EAC"),
> > + EDP_PANEL_ENTRY('C', 'M', 'N', 0x144f, &delay_200_500_e80_d50, "N140HGA-EA1"),
> > + EDP_PANEL_ENTRY('C', 'M', 'N', 0x1468, &delay_200_500_e80, "N140HGA-EA1"),
> > + EDP_PANEL_ENTRY('C', 'M', 'N', 0x14e5, &delay_200_500_e80_d50, "N140HGA-EA1"),
> > EDP_PANEL_ENTRY('C', 'M', 'N', 0x14d4, &delay_200_500_e80_d50, "N140HCA-EAC"),
> > + EDP_PANEL_ENTRY('C', 'M', 'N', 0x14d6, &delay_200_500_e80_d50, "N140BGA-EA4"),
> > +
> > + EDP_PANEL_ENTRY('H', 'K', 'C', 0x2d5c, &delay_200_500_e200, "MB116AN01-2"),
> >
> > + EDP_PANEL_ENTRY('I', 'V', 'O', 0x048e, &delay_200_500_e200_d10, "M116NWR6 R5"),
> > EDP_PANEL_ENTRY('I', 'V', 'O', 0x057d, &delay_200_500_e200, "R140NWF5 RH"),
> > EDP_PANEL_ENTRY('I', 'V', 'O', 0x854a, &delay_200_500_p2e100, "M133NW4J"),
> > EDP_PANEL_ENTRY('I', 'V', 'O', 0x854b, &delay_200_500_p2e100, "R133NW4K-R0"),
> > + EDP_PANEL_ENTRY('I', 'V', 'O', 0x8c4d, &delay_200_150_e200, "R140NWFM R1"),
> >
> > EDP_PANEL_ENTRY('K', 'D', 'B', 0x0624, &kingdisplay_kd116n21_30nv_a010.delay, "116N21-30NV-A010"),
> > EDP_PANEL_ENTRY('K', 'D', 'B', 0x1120, &delay_200_500_e80_d50, "116N29-30NK-C007"),
> > + EDP_PANEL_ENTRY('K', 'D', 'C', 0x0809, &delay_200_150_e50, "KD116N2930A15"),
>
> Please sort 0x0809 above 0x1120.
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