From: "Luca Weiss" <luca.weiss@fairphone.com>
To: <neil.armstrong@linaro.org>,
"Konrad Dybcio" <konrad.dybcio@linaro.org>,
"Bjorn Andersson" <andersson@kernel.org>
Cc: "Vinod Koul" <vkoul@kernel.org>,
"Kishon Vijay Abraham I" <kishon@kernel.org>,
"Rob Herring" <robh@kernel.org>,
"Krzysztof Kozlowski" <krzysztof.kozlowski+dt@linaro.org>,
"Conor Dooley" <conor+dt@kernel.org>,
"Abhinav Kumar" <quic_abhinavk@quicinc.com>,
<linux-arm-msm@vger.kernel.org>, <linux-phy@lists.infradead.org>,
<devicetree@vger.kernel.org>, <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH RFT 0/7] arm64: qcom: allow up to 4 lanes for the Type-C DisplayPort Altmode
Date: Fri, 05 Apr 2024 12:19:46 +0200 [thread overview]
Message-ID: <D0C42YR1270X.23P9WCWWNB8XF@fairphone.com> (raw)
In-Reply-To: <963b60e5-6ab7-4d9f-885a-ba744c2b7991@linaro.org>
On Fri Apr 5, 2024 at 10:08 AM CEST, Neil Armstrong wrote:
> Hi Luca,
>
> On 29/03/2024 10:02, Luca Weiss wrote:
> > On Tue Mar 26, 2024 at 10:02 PM CET, Konrad Dybcio wrote:
> >> On 16.03.2024 5:01 PM, Bjorn Andersson wrote:
> >>> On Fri, Mar 15, 2024 at 06:35:15PM +0100, Neil Armstrong wrote:
> >>>> On 15/03/2024 18:19, Luca Weiss wrote:
> >>>>> On Thu Feb 29, 2024 at 2:07 PM CET, Neil Armstrong wrote:
> >>>>>> Register a typec mux in order to change the PHY mode on the Type-C
> >>>>>> mux events depending on the mode and the svid when in Altmode setup.
> >>>>>>
> >>>>>> The DisplayPort phy should be left enabled if is still powered on
> >>>>>> by the DRM DisplayPort controller, so bail out until the DisplayPort
> >>>>>> PHY is not powered off.
> >>>>>>
> >>>>>> The Type-C Mode/SVID only changes on plug/unplug, and USB SAFE states
> >>>>>> will be set in between of USB-Only, Combo and DisplayPort Only so
> >>>>>> this will leave enough time to the DRM DisplayPort controller to
> >>>>>> turn of the DisplayPort PHY.
> >>>>>>
> >>>>>> The patchset also includes bindings changes and DT changes.
> >>>>>>
> >>>>>> This has been successfully tested on an SM8550 board, but the
> >>>>>> Thinkpad X13s deserved testing between non-PD USB, non-PD DisplayPort,
> >>>>>> PD USB Hubs and PD Altmode Dongles to make sure the switch works
> >>>>>> as expected.
> >>>>>>
> >>>>>> The DisplayPort 4 lanes setup can be check with:
> >>>>>> $ cat /sys/kernel/debug/dri/ae01000.display-controller/DP-1/dp_debug
> >>>>>> name = msm_dp
> >>>>>> drm_dp_link
> >>>>>> rate = 540000
> >>>>>> num_lanes = 4
> >>>>>
> >>>>> Hi Neil,
> >>>>>
> >>>>> I tried this on QCM6490/SC7280 which should also support 4-lane DP but I
> >>>>> haven't had any success so far.
> >>>>>
> >>> [..]
> >>>>> [ 1775.563969] [drm:dp_ctrl_link_train] *ERROR* max v_level reached
> >>>>> [ 1775.564031] [drm:dp_ctrl_link_train] *ERROR* link training #1 failed. ret=-11
> >>>>
> >>>> Interesting #1 means the 4 lanes are not physically connected to the other side,
> >>>> perhaps QCM6490/SC7280 requires a specific way to enable the 4 lanes in the PHY,
> >>>> or some fixups in the init tables.
> >>>>
> >>>
> >>> I tested the same on rb3gen2 (qcs6490) a couple of weeks ago, with the
> >>> same outcome. Looking at the AUX reads, after switching to 4-lane the
> >>> link training is failing on all 4 lanes, in contrast to succeeding only
> >>> on the first 2 if you e.g. forget to mux the other two.
> >>>
> >>> As such, my expectation is that there's something wrong in the QMP PHY
> >>> (or possibly redriver) for this platform.
> >>
> >> Do we have any downstream tag where 4lane dp works? I'm willing to believe
> >> the PHY story..
> >
> > Just tested on Fairphone 5 downstream and 4 lane appears to work there.
> > This is with an USB-C to HDMI adapter that only does HDMI.
> >
> > FP5:/ # cat /sys/kernel/debug/drm_dp/dp_debug
> > state=0x20a5
> > link_rate=270000
> > num_lanes=4
> > resolution=2560x1440@60Hz
> > pclock=241500KHz
> > bpp=24
> > test_req=DP_LINK_STATUS_UPDATED
> > lane_count=4
> > bw_code=10
> > v_level=0
> > p_level=0
> >
> > Sources are here:
> > https://gerrit-public.fairphone.software/plugins/gitiles/kernel/msm-5.4/+/refs/heads/odm/rc/target/13/fp5
> > And probably more importantly techpack/display:
> > https://gerrit-public.fairphone.software/plugins/gitiles/platform/vendor/opensource/display-drivers/+/refs/heads/odm/rc/target/13/fp5
> > Dts if useful:
> > https://gerrit-public.fairphone.software/plugins/gitiles/kernel/msm-extra/devicetree/+/refs/heads/kernel/13/fp5
>
> Could you retry with this applied ?
>
> https://lore.kernel.org/all/20240405000111.1450598-1-swboyd@chromium.org/
Unfortunately I do not see any change with this on QCM6490 Fairphone 5
and 4-lane DP.
Regards
Luca
>
> Thanks,
> Neil
>
> >
> > Regards
> > Luca
> >
> >>
> >> Konrad
> >
next prev parent reply other threads:[~2024-04-05 10:19 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-02-29 13:07 [PATCH RFT 0/7] arm64: qcom: allow up to 4 lanes for the Type-C DisplayPort Altmode Neil Armstrong
2024-02-29 13:07 ` [PATCH RFT 1/7] dt-bindings: phy: qcom,sc8280xp-qmp-usb43dp: Add mode-switch Neil Armstrong
2024-03-04 16:22 ` Rob Herring
2024-02-29 13:07 ` [PATCH RFT 2/7] phy: qcom: qmp-combo: store DP phy power state Neil Armstrong
2024-02-29 13:07 ` [PATCH RFT 3/7] phy: qcom: qmp-combo: introduce QPHY_MODE Neil Armstrong
2024-03-29 16:56 ` Vinod Koul
2024-02-29 13:07 ` [PATCH RFT 4/7] phy: qcom: qmp-combo: register a typec mux to change the QPHY_MODE Neil Armstrong
2024-02-29 15:25 ` Dmitry Baryshkov
2024-02-29 15:47 ` Neil Armstrong
2024-02-29 15:54 ` Dmitry Baryshkov
2024-02-29 15:57 ` neil.armstrong
2024-02-29 13:07 ` [PATCH RFT 5/7] arm64: dts: qcom-sm8550: allow 4 lanes for DisplayPort and enable QMP PHY mode-switch Neil Armstrong
2024-02-29 13:07 ` [PATCH RFT 6/7] arm64: dts: qcom-sm8650: " Neil Armstrong
2024-02-29 13:07 ` [PATCH RFT 7/7] arm64: dts: qcom-mode-switch: " Neil Armstrong
2024-02-29 13:11 ` Neil Armstrong
2024-03-01 3:00 ` Bjorn Andersson
2024-03-01 18:31 ` Neil Armstrong
2024-03-15 17:19 ` [PATCH RFT 0/7] arm64: qcom: allow up to 4 lanes for the Type-C DisplayPort Altmode Luca Weiss
2024-03-15 17:35 ` Neil Armstrong
2024-03-16 16:01 ` Bjorn Andersson
2024-03-18 10:45 ` Luca Weiss
2024-03-26 21:02 ` Konrad Dybcio
2024-03-29 9:02 ` Luca Weiss
2024-04-05 8:08 ` Neil Armstrong
2024-04-05 10:19 ` Luca Weiss [this message]
2024-04-23 13:03 ` Konrad Dybcio
2024-04-23 14:08 ` neil.armstrong
2024-05-10 6:51 ` Luca Weiss
2024-05-23 9:06 ` neil.armstrong
2024-05-24 6:51 ` Luca Weiss
2024-05-24 7:08 ` neil.armstrong
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=D0C42YR1270X.23P9WCWWNB8XF@fairphone.com \
--to=luca.weiss@fairphone.com \
--cc=andersson@kernel.org \
--cc=conor+dt@kernel.org \
--cc=devicetree@vger.kernel.org \
--cc=kishon@kernel.org \
--cc=konrad.dybcio@linaro.org \
--cc=krzysztof.kozlowski+dt@linaro.org \
--cc=linux-arm-msm@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-phy@lists.infradead.org \
--cc=neil.armstrong@linaro.org \
--cc=quic_abhinavk@quicinc.com \
--cc=robh@kernel.org \
--cc=vkoul@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).