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[78.88.45.245]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-ba454d1bbb1sm534393066b.38.2026.04.22.06.04.50 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 22 Apr 2026 06:04:51 -0700 (PDT) Message-ID: Date: Wed, 22 Apr 2026 15:04:49 +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 Subject: Re: [PATCH] arm64: dts: qcom: qcs6490-rb3gen2: Enable 4-lane DisplayPort Alt Mode To: Mahadevan P , Bjorn Andersson , Konrad Dybcio , Rob Herring , Krzysztof Kozlowski , Conor Dooley Cc: linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org References: <20260420-kodiak_4k-v1-1-83dfc66b8f06@oss.qualcomm.com> <82a32de4-82c9-4494-838d-48900dca49ad@oss.qualcomm.com> <8eef8d68-b059-469e-9004-39bfe44667cc@oss.qualcomm.com> Content-Language: en-US From: Konrad Dybcio In-Reply-To: <8eef8d68-b059-469e-9004-39bfe44667cc@oss.qualcomm.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Proofpoint-ORIG-GUID: TnMBMoSRP-b8rtMYCn7ZeAqlxJisBPM3 X-Authority-Analysis: v=2.4 cv=c5ibhx9l c=1 sm=1 tr=0 ts=69e8c775 cx=c_pps a=AKZTfHrQPB8q3CcvmcIuDA==:117 a=FpWmc02/iXfjRdCD7H54yg==:17 a=IkcTkHD0fZMA:10 a=A5OVakUREuEA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=DJpcGTmdVt4CTyJn9g5Z:22 a=VwQbUJbxAAAA:8 a=EUspDBNiAAAA:8 a=jWp9Vnr_aMZy7lUlAP8A:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 a=pF_qn-MSjDawc0seGVz6:22 X-Proofpoint-GUID: TnMBMoSRP-b8rtMYCn7ZeAqlxJisBPM3 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNDIyMDEyNSBTYWx0ZWRfX/gkAXuKY1j1r 3KmxxKQ/IhB4TZnkUR+XrTZHwR0GpjLqQB6G/AxHWscrgsL2vD6hCO+AXlElW8Xhe47ZMrd1wud 3Zzke9vlhKp6FLNMKM4N43OyBzvDst+lRRNCn+kpbRSEToHW64dD9oOsobLcze+aL7nd3GlI2YM rafs9FpbOIbhTZV010GF5EqHe5irjUt4Gccucg9ExN3ztW6zmao/BmHyBHoF2Zm1fy8zauzM0Tt bGQ/BLukHcI18/mUcDW3zxSGWP0/9I6y80kfvve7mxsIVRhWFnsX+IqcXxCXbm57dKvzwsijO7X 3Vy3erl4U4uBW4ZmMqqOiP4UgDJMtHKhNIGj+Tu7IRE2oH5wfVIs0lM57MS6t6wDcGoHo4TD25Y x/+9rCZXm9f8XqwQrTGLGbEeVdHjA2WWlux7Rl1OFxrKnjYbip3dFBgfch9yTu7SjGTU4Yyx30V ui3xGUY2EqY8iTiiZeQ== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-04-22_01,2026-04-21_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 malwarescore=0 spamscore=0 lowpriorityscore=0 suspectscore=0 adultscore=0 impostorscore=0 phishscore=0 clxscore=1015 priorityscore=1501 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2604200000 definitions=main-2604220125 On 4/22/26 2:31 PM, Mahadevan P wrote: > > > On 4/22/2026 4:19 PM, Konrad Dybcio wrote: >> On 4/20/26 12:00 PM, Mahadevan P wrote: >>> Add the mode-switch property to the QMP combo PHY so that mode-switch >>> events are routed to it, allowing the PHY to enter DisplayPort Alternate >>> Mode. Expand the DP data-lanes assignment from two to four lanes to make >>> use of the full link bandwidth available in this configuration. >>> >>> Signed-off-by: Mahadevan P >>> --- >>>   arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts | 3 ++- >>>   1 file changed, 2 insertions(+), 1 deletion(-) >>> >>> diff --git a/arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts b/arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts >>> index e393ccf1884a..0c180e49816f 100644 >>> --- a/arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts >>> +++ b/arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts >>> @@ -789,7 +789,7 @@ &mdss_dp { >>>   }; >>>     &mdss_dp_out { >>> -    data-lanes = <0 1>; >>> +    data-lanes = <0 1 2 3>; >>>       remote-endpoint = <&usb_dp_qmpphy_dp_in>; >> >> There was an issue with this on a similar kodiak-iot board: >> >> https://lore.kernel.org/linux-arm-msm/zjmf27y5i6ypba3nvsxxceuxn6yogp46lmtrjua37qa4ibrleq@4qv5s2wirgdh/ >> >> Have you confirmed (through debugfs) that 4 lanes are in use when >> running this on r3g2? >> > > yes Thanks for confirming! Konrad