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Wed, 22 Apr 2026 05:31:11 -0700 (PDT) X-Received: by 2002:a05:6a00:e08:b0:82f:5dc3:b376 with SMTP id d2e1a72fcca58-82f8c8fb888mr23014131b3a.25.1776861071210; Wed, 22 Apr 2026 05:31:11 -0700 (PDT) Received: from [10.206.104.135] ([202.46.23.25]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-82f8e9e0f40sm18564102b3a.17.2026.04.22.05.31.07 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 22 Apr 2026 05:31:10 -0700 (PDT) Message-ID: <8eef8d68-b059-469e-9004-39bfe44667cc@oss.qualcomm.com> Date: Wed, 22 Apr 2026 18:01:06 +0530 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: Konrad Dybcio , 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> Content-Language: en-US From: Mahadevan P In-Reply-To: <82a32de4-82c9-4494-838d-48900dca49ad@oss.qualcomm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNDIyMDEyMCBTYWx0ZWRfX5SkLrTztU2D0 Iap+7TwrEMOat3UgLw+YfzONBrZXr0KEHcBtnucoCgPXHjw9JPMdM25JLs0nbrj9V0RqBY2XDm3 Jze06JsgvsUPEF8j8/VBUOK8oYGKpSxwq3U/MOh4RGYEsYyYcyB0Dnhx83gdTeRZC5cec5N2uMf eN101Aph0tin18/cq7YNX8BmVVfVKtdoYlYCtnigzqxgpSMVCjLc/ov+KHrw2ufCQJ6Bpe6O3os uQIcRWpKDjfFvnFc5IXDIj/9RlfG1aO1RuljeVHm1z/GmWX3NoMufGe15pMQnIZ4vJjnCh7Mdcf ZN29xpMQb+IZM1NcNSbFHasSK4MyStN4/0/kxeEYalHbRk9nS1QWopLBsduFYWXNyU30adyuNzu j7VEPBJsFa83t7SCdlQLMVAQRmfoCcVi904S6cbhqqjTkaM0ZDapRWQ5eLkVBawmZC+GNNHAqSe FwQZNg1tC5+DOaXoqZQ== X-Proofpoint-GUID: GBw2CY3RnKx3CEHejn-o4OaNI5QyyMEp X-Proofpoint-ORIG-GUID: GBw2CY3RnKx3CEHejn-o4OaNI5QyyMEp X-Authority-Analysis: v=2.4 cv=RoT16imK c=1 sm=1 tr=0 ts=69e8bf90 cx=c_pps a=WW5sKcV1LcKqjgzy2JUPuA==:117 a=ZePRamnt/+rB5gQjfz0u9A==:17 a=IkcTkHD0fZMA:10 a=A5OVakUREuEA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=YMgV9FUhrdKAYTUUvYB2:22 a=VwQbUJbxAAAA:8 a=EUspDBNiAAAA:8 a=fCkYvREgeGE0EZizEysA:9 a=QEXdDO2ut3YA:10 a=OpyuDcXvxspvyRM73sMx:22 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 clxscore=1015 spamscore=0 impostorscore=0 lowpriorityscore=0 priorityscore=1501 phishscore=0 adultscore=0 bulkscore=0 suspectscore=0 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2604200000 definitions=main-2604220120 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 root@rb3gen2-core-kit:/sys/kernel/debug/dri/0/DP-1# cat dp_debug name = msm_dp drm_dp_link rate = 540000 num_lanes = 4 capabilities = 1 dp_panel_info: active = 3840x2160 back_porch = 80x54 front_porch = 48x3 sync_width = 32x5 active_low = 0x0 h_skew = 0 refresh rate = 60 pixel clock khz = 533250 bpp = 30 dp_link: test_requested = 128 num_lanes = 4 bw_code = 20 lclk = 540000000 v_level = 2 p_level = 0 > >> }; >> >> @@ -1391,6 +1391,7 @@ &usb_1_qmpphy { >> vdda-phy-supply = <&vreg_l6b_1p2>; >> vdda-pll-supply = <&vreg_l1b_0p912>; >> >> + mode-switch; > > This should be moved to kodiak.dtsi sure > > Konrad