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Tue, 18 Aug 2026 03:39:04 -0700 (PDT) X-Received: by 2002:a05:620a:2a12:b0:933:9bf:cc73 with SMTP id af79cd13be357-936d2357528mr2423693685a.3.1787049544119; Tue, 18 Aug 2026 03:39:04 -0700 (PDT) Received: from [192.168.120.193] ([178.235.128.140]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-c217fe6aa89sm166585566b.2.2026.08.18.03.39.01 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 18 Aug 2026 03:39:03 -0700 (PDT) Message-ID: <9fab8686-d0fa-40df-a6d0-75349861d78a@oss.qualcomm.com> Date: Tue, 18 Aug 2026 12:39:00 +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: glymur eDP PHY (v8): link trains only at HBR3, all lower rates fail To: Jesse Casco , Abel Vesa Cc: Abel Vesa , Yongxing Mou , Dmitry Baryshkov , Vinod Koul , Neil Armstrong , Rob Clark , Abhinav Kumar , linux-phy@lists.infradead.org, linux-arm-msm@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org References: <20260808171321.133028-1-jesse.casco@gmail.com> Content-Language: en-US From: Konrad Dybcio In-Reply-To: <20260808171321.133028-1-jesse.casco@gmail.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Proofpoint-Spam-Info: AW1haW4tMjYwODE4MDA3OCBTYWx0ZWRfXzmIMHPDANxz4 5Sm+AqNimOuxjbCzwEHsyrhrCYMK8MRxnp95jbEB1aI1VcNNmeUuBrfa6pTckc0GOlV/jcQER65 KsfezJWP+m7phZleWdH0cmp9CaLcgi8= X-Authority-Analysis: v=2.4 cv=VuITxe2n c=1 sm=1 tr=0 ts=6a843649 cx=c_pps a=HLyN3IcIa5EE8TELMZ618Q==:117 a=PRfkaYvzSr8QmIIGAkY2Sg==:17 a=IkcTkHD0fZMA:10 a=Sv0fKeRqtYgA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=gowsoOTTUOVcmtlkKump:22 a=VwQbUJbxAAAA:8 a=EUspDBNiAAAA:8 a=nkM7kGyF-zu4sKUpaxcA:9 a=QEXdDO2ut3YA:10 a=bTQJ7kPSJx9SKPbeHEYW:22 X-Proofpoint-GUID: dgUs7RstDDrgw1FW4OXu9wzUFB7a6qag X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwODE4MDA3OCBTYWx0ZWRfX1BFMTaxDt4oi 0SdF3SgHuK/K8SaWDTERZnGiDLA6QIJZ0pDa31ZbnMhBcl6fjNeKNp3XBnBzAdZAogQRcyVgkQP N+VFMSUhgxdXEjzNMJzEi5R4vPYKryhh13DEkMlWJoM8u5/TVwWrWBT6IrFffCwIuK4n4wx1s4d R+pE4CTtqWOS62rNUtd0pZY33B7N1U8E9kVSE8gVV30NjAY8mzXaIwIrMq0OHzQSYBzqeYKztAd B2h7Lbfd+1idVG+JWCv1CicNDCe1LjLyqEbGZx6NXPoKcEZD+lQL2q04H66hnL/bp/M1GZw8IjW 2wCFcRQ/hBCAazqwyJYS3nMLIfFGrGAfAzYt2epEoT7l6gUmJyFv4CGGYaJyWHK7LdcgcPRhJgT obfp30AaUaONNDpA+NtqFy8rJPEIveCMj7iolTlF3IR7EUfx20ANeS6/DIPe1i7EhCvnCAGYFt1 vyGZ011geErIa7sd2qw== X-Proofpoint-ORIG-GUID: dgUs7RstDDrgw1FW4OXu9wzUFB7a6qag X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-08-18_01,2026-08-12_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 priorityscore=1501 clxscore=1015 spamscore=0 adultscore=0 impostorscore=0 lowpriorityscore=0 bulkscore=0 malwarescore=0 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2608180078 On 8/8/26 7:13 PM, Jesse Casco wrote: > Hi Abel, > > On an ASUS Zenbook A16 (UX3607OA, Snapdragon X2 Elite Extreme) the internal > eDP panel never comes up on mainline. It is the link rate: the v8 eDP PHY > appears to bring up a usable link only at HBR3. > > Tested on linux-next next-20260713, next-20260803 and next-20260807, where > phy-qcom-edp.c is byte-identical -- so not a recent regression, and the May > 2026 series (eDP low-vdiff LDO config, unified swing/pre-emphasis tables, > eDP/DP mode switch) is present in the tree tested here. The sweep below is > from next-20260803; the machine has since run next-20260807 as its daily > driver, where HBR3 still trains every boot. I mentioned in my submission that this series is required on top: https://lore.kernel.org/linux-arm-msm/20260622-glymur-edp-phy-v1-0-814b45089ac9@oss.qualcomm.com/ Konrad