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([2a01:e0a:982:cbb0:dfee:1061:7e39:bfff]) by smtp.gmail.com with ESMTPSA id q12-20020adfcd8c000000b00343cad2a4d3sm14625332wrj.18.2024.04.23.07.08.43 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 23 Apr 2024 07:08:44 -0700 (PDT) Message-ID: <864063fb-eeae-4eb7-9089-0d98011a0343@linaro.org> Date: Tue, 23 Apr 2024 16:08:43 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird From: neil.armstrong@linaro.org Reply-To: neil.armstrong@linaro.org Subject: Re: [PATCH RFT 0/7] arm64: qcom: allow up to 4 lanes for the Type-C DisplayPort Altmode To: Konrad Dybcio , Luca Weiss , Bjorn Andersson Cc: Vinod Koul , Kishon Vijay Abraham I , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Abhinav Kumar , linux-arm-msm@vger.kernel.org, linux-phy@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org References: <20240229-topic-sm8x50-upstream-phy-combo-typec-mux-v1-0-07e24a231840@linaro.org> <7a7aa05f-9ae6-4ca0-a423-224fc78fbd0c@linaro.org> <236a104c-fc16-4b3d-9a00-e16517c00e3a@linaro.org> <963b60e5-6ab7-4d9f-885a-ba744c2b7991@linaro.org> Content-Language: en-US, fr Autocrypt: addr=neil.armstrong@linaro.org; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit On 23/04/2024 15:03, Konrad Dybcio wrote: > > > On 4/5/24 12:19, Luca Weiss wrote: >> 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. > > Hm, could you like dump all the PHY regions up and downstream with the display > connected (and nothing connected) and compare them? Yes would be great, PHY regions and DP regions as well. 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