From: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
To: "Sankeerth Billakanti (QUIC)" <quic_sbillaka@quicinc.com>
Cc: quic_kalyant <quic_kalyant@quicinc.com>,
"open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS"
<devicetree@vger.kernel.org>,
"bjorn.andersson@linaro.org" <bjorn.andersson@linaro.org>,
"Abhinav Kumar \(QUIC\)" <quic_abhinavk@quicinc.com>,
quic_vproddut <quic_vproddut@quicinc.com>,
David Airlie <airlied@linux.ie>,
linux-arm-msm <linux-arm-msm@vger.kernel.org>,
"Kuogee Hsieh \(QUIC\)" <quic_khsieh@quicinc.com>,
Doug Anderson <dianders@chromium.org>,
dri-devel <dri-devel@lists.freedesktop.org>,
LKML <linux-kernel@vger.kernel.org>, Sean Paul <sean@poorly.run>,
Sean Paul <seanpaul@chromium.org>,
"Aravind Venkateswaran \(QUIC\)" <quic_aravindh@quicinc.com>,
Stephen Boyd <swboyd@chromium.org>,
freedreno <freedreno@lists.freedesktop.org>
Subject: Re: [PATCH v6 7/8] drm/msm/dp: Support edp/dp without hpd
Date: Tue, 5 Apr 2022 00:15:16 +0300 [thread overview]
Message-ID: <CAA8EJppB8s=myUG+swLF5vQU+b+mGSjrNsn1-=1cgO9rKXC7Xw@mail.gmail.com> (raw)
In-Reply-To: <MW4PR02MB7186DD14809500D97C3ABDBBE1E59@MW4PR02MB7186.namprd02.prod.outlook.com>
On Mon, 4 Apr 2022 at 21:32, Sankeerth Billakanti (QUIC)
<quic_sbillaka@quicinc.com> wrote:
>
> Hi Doug,
>
> > On Wed, Mar 30, 2022 at 9:04 AM Sankeerth Billakanti
> > <quic_sbillaka@quicinc.com> wrote:
> > >
> > > Some eDP sinks or platform boards will not support hpd.
> > > This patch adds support for those cases.
> >
> > You could say more, like:
> >
> > If we're not using HPD then _both_ the panel node and the eDP controller
> > node will have "no-hpd". This tells the eDP panel code to hardcode the
> > maximum possible delay for a panel to power up and tells the eDP driver that
> > it should continue to do transfers even if HPD isn't asserted.
> >
>
> Okay. I will add it
>
> >
> > > Signed-off-by: Sankeerth Billakanti <quic_sbillaka@quicinc.com>
> > > ---
> > > drivers/gpu/drm/msm/dp/dp_catalog.c | 15 ++++++++++++---
> > > 1 file changed, 12 insertions(+), 3 deletions(-)
> > >
> > > diff --git a/drivers/gpu/drm/msm/dp/dp_catalog.c
> > > b/drivers/gpu/drm/msm/dp/dp_catalog.c
> > > index 1809ce2..8f1fc71 100644
> > > --- a/drivers/gpu/drm/msm/dp/dp_catalog.c
> > > +++ b/drivers/gpu/drm/msm/dp/dp_catalog.c
> > > @@ -244,10 +244,17 @@ void dp_catalog_aux_update_cfg(struct
> > dp_catalog
> > > *dp_catalog)
> > >
> > > int dp_catalog_aux_wait_for_hpd_connect_state(struct dp_catalog
> > > *dp_catalog) {
> > > - u32 state;
> > > + u32 state, hpd_en;
> > > struct dp_catalog_private *catalog = container_of(dp_catalog,
> > > struct dp_catalog_private,
> > > dp_catalog);
> > >
> > > + hpd_en = dp_read_aux(catalog, REG_DP_DP_HPD_CTRL);
> > > + hpd_en &= DP_DP_HPD_CTRL_HPD_EN;
> > > +
> > > + /* no-hpd case */
> > > + if (!hpd_en)
> > > + return 0;
> > > +
> > > /* poll for hpd connected status every 2ms and timeout after 500ms */
> > > return readl_poll_timeout(catalog->io->dp_controller.aux.base +
> > > REG_DP_DP_HPD_INT_STATUS, @@ -586,8
> > > +593,10 @@ void dp_catalog_ctrl_hpd_config(struct dp_catalog
> > *dp_catalog)
> > > reftimer |= DP_DP_HPD_REFTIMER_ENABLE;
> > > dp_write_aux(catalog, REG_DP_DP_HPD_REFTIMER, reftimer);
> > >
> > > - /* Enable HPD */
> > > - dp_write_aux(catalog, REG_DP_DP_HPD_CTRL,
> > DP_DP_HPD_CTRL_HPD_EN);
> > > + /* Enable HPD if supported*/
> > > + if (!of_property_read_bool(catalog->dev->of_node, "no-hpd"))
> >
> > I don't think this is a particularly lightweight operation. It's literally iterating
> > through all of our device tree properties and doing string compares on them.
> > ...but this function is called somewhat often, isn't it? It feels like the kind of
> > thing that should happen at probe time and be stored in a boolean.
> >
> > ...and then you can use that same boolean in
> > dp_catalog_aux_wait_for_hpd_connect_state() rather than reading the
> > register value, right?
> >
> It is called twice for DP. Once while booting through a thread scheduled from kms_obj_init
> and when resuming from PM suspend.
>
> With aux_bus addition, this function will be called thrice for eDP. Once during bootup with
> aux_bus, then from scheduled event from kms_obj_init and pm resume like DP.
>
> I will check if we can use a no-hpd Boolean flag instead.
As the driver has a separate dp_parser code, it might be a good fit to
parse the DT once and then to use boolean flag afterwards.
--
With best wishes
Dmitry
next prev parent reply other threads:[~2022-04-04 21:15 UTC|newest]
Thread overview: 70+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-03-30 16:02 [PATCH v6 0/8] Add support for the eDP panel over aux_bus Sankeerth Billakanti
2022-03-30 16:02 ` [PATCH v6 1/8] drm/msm/dp: Add eDP support via aux_bus Sankeerth Billakanti
2022-03-30 23:19 ` Dmitry Baryshkov
2022-03-31 0:33 ` Doug Anderson
2022-03-31 23:22 ` Doug Anderson
2022-04-02 10:37 ` Dmitry Baryshkov
2022-04-02 17:06 ` Doug Anderson
2022-04-02 20:26 ` Dmitry Baryshkov
2022-04-04 20:53 ` Doug Anderson
2022-04-05 12:53 ` Dmitry Baryshkov
2022-04-05 17:02 ` Doug Anderson
2022-04-05 17:36 ` Dmitry Baryshkov
2022-04-05 18:11 ` Doug Anderson
2022-04-07 14:19 ` Sankeerth Billakanti (QUIC)
2022-04-07 17:07 ` Doug Anderson
2022-04-07 20:11 ` Abhinav Kumar
2022-04-07 20:47 ` Doug Anderson
2022-04-07 22:03 ` Abhinav Kumar
2022-04-07 23:34 ` Doug Anderson
2022-04-07 23:46 ` Dmitry Baryshkov
2022-04-08 0:21 ` Doug Anderson
2022-04-08 12:19 ` Dmitry Baryshkov
2022-04-08 13:43 ` Doug Anderson
2022-04-08 14:58 ` Dmitry Baryshkov
2022-04-08 17:23 ` Abhinav Kumar
2022-04-07 23:35 ` Dmitry Baryshkov
2022-04-08 0:20 ` Doug Anderson
2022-04-08 12:13 ` Dmitry Baryshkov
2022-04-08 13:56 ` Doug Anderson
2022-04-08 14:17 ` Dmitry Baryshkov
2022-03-30 16:02 ` [PATCH v6 2/8] drm/msm/dp: wait for hpd high before aux transaction Sankeerth Billakanti
2022-03-31 23:22 ` Doug Anderson
2022-04-04 12:43 ` Sankeerth Billakanti (QUIC)
2022-03-30 16:02 ` [PATCH v6 3/8] drm/msm/dp: Support only IRQ_HPD and REPLUG interrupts for eDP Sankeerth Billakanti
2022-03-31 23:22 ` Doug Anderson
2022-04-04 12:56 ` Sankeerth Billakanti (QUIC)
2022-03-30 16:02 ` [PATCH v6 4/8] drm/msm/dp: avoid handling masked interrupts Sankeerth Billakanti
2022-03-30 22:16 ` Dmitry Baryshkov
2022-03-31 5:53 ` Sankeerth Billakanti (QUIC)
2022-03-31 10:10 ` Dmitry Baryshkov
2022-03-31 11:04 ` Sankeerth Billakanti
2022-03-31 11:06 ` Dmitry Baryshkov
2022-04-04 17:56 ` Sankeerth Billakanti (QUIC)
2022-03-30 16:02 ` [PATCH v6 5/8] drm/msm/dp: prevent multiple votes for dp resources Sankeerth Billakanti
2022-03-31 23:23 ` Doug Anderson
2022-04-08 16:14 ` Dmitry Baryshkov
2022-04-08 17:12 ` Sankeerth Billakanti
2022-04-08 18:02 ` Dmitry Baryshkov
2022-03-30 16:02 ` [PATCH v6 6/8] drm/msm/dp: remove unnecessary delay during boot Sankeerth Billakanti
2022-03-31 23:23 ` Doug Anderson
2022-04-04 13:52 ` Sankeerth Billakanti (QUIC)
2022-04-04 21:13 ` Dmitry Baryshkov
2022-04-07 12:40 ` Sankeerth Billakanti (QUIC)
2022-03-30 16:02 ` [PATCH v6 7/8] drm/msm/dp: Support edp/dp without hpd Sankeerth Billakanti
2022-03-31 23:23 ` Doug Anderson
2022-04-04 18:32 ` Sankeerth Billakanti (QUIC)
2022-04-04 21:15 ` Dmitry Baryshkov [this message]
2022-04-07 12:41 ` Sankeerth Billakanti (QUIC)
2022-03-30 16:02 ` [PATCH v6 8/8] drm/msm/dp: Handle eDP mode_valid differently from dp Sankeerth Billakanti
2022-03-30 22:08 ` Dmitry Baryshkov
2022-03-31 6:02 ` Sankeerth Billakanti (QUIC)
2022-03-31 23:24 ` Doug Anderson
2022-04-04 18:20 ` Sankeerth Billakanti (QUIC)
2022-04-04 21:29 ` Dmitry Baryshkov
2022-04-07 14:05 ` Sankeerth Billakanti (QUIC)
2022-04-08 12:08 ` Dmitry Baryshkov
2022-04-08 15:50 ` Sankeerth Billakanti
2022-04-08 16:47 ` Dmitry Baryshkov
2022-04-08 17:38 ` Sankeerth Billakanti
2022-04-08 18:06 ` Dmitry Baryshkov
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