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[103.229.16.4]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-82f8e9d6adbsm38893029b3a.18.2026.04.26.23.27.20 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 26 Apr 2026 23:27:23 -0700 (PDT) Message-ID: Date: Mon, 27 Apr 2026 14:27:19 +0800 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 v4 3/5] phy: qcom: edp: Add SC7280/SC8180X swing/pre-emphasis tables To: Dmitry Baryshkov Cc: Konrad Dybcio , Vinod Koul , Neil Armstrong , Stephen Boyd , Bjorn Andersson , linux-arm-msm@vger.kernel.org, linux-phy@lists.infradead.org, linux-kernel@vger.kernel.org References: <20260422-edp_phy-v4-0-c38bef2d027b@oss.qualcomm.com> <20260422-edp_phy-v4-3-c38bef2d027b@oss.qualcomm.com> Content-Language: en-US From: Yongxing Mou In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Proofpoint-GUID: bXnCkdZSSNsOBKH9LIZiFYibrhMc9E3a X-Authority-Analysis: v=2.4 cv=H67rBeYi c=1 sm=1 tr=0 ts=69ef01ce cx=c_pps a=m5Vt/hrsBiPMCU0y4gIsQw==:117 a=nuhDOHQX5FNHPW3J6Bj6AA==:17 a=IkcTkHD0fZMA:10 a=A5OVakUREuEA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=YMgV9FUhrdKAYTUUvYB2:22 a=-ojWompm966yaKU_kDQA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 a=IoOABgeZipijB_acs4fv:22 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNDI3MDA2NyBTYWx0ZWRfX+2DQs4m9eF9o vSpiVaVtLl9nuXVA8hI5nqBDKh26ZrLxmz/Mx0ph4StRy4pROu9E9vroQHh5JC6PWXHTHhQ/83Z EupGVxJKBvQHpOycVhgE3+fAPGYgkkwSAm5ZRTWkQwD7+wi8YmekzgS3tyqk+EtIiDtHrxileuU K5p+b9ugg7+nR2vWm+mQDpqOZAEDgQwsVxFsdL9JKnUBWgi0NeGJVgcDYD+WgOhg0taVS+APMXb k4DoATKAWC5yILGRWjrC8ngUrM/3qpxP2MjaczpFVmGbVoLVcs5rVyHCrPP9VjU2GnDWtvS6r8P Q5gfZlMEkEcTwmDp0Rm26usfq8LKjjpPCMXMWxRLcGdB9gv2bFNM88VVlcpu3BPr3P/qmkvrEiR lHll6LP6fYAw5f6OXCwIc8Ox8cHWIv8bg5yiOoLpOqcgXGW6n4E8eneJFKQfYtZ31fiqBJe5f0v xLTNxOpEg+Kr+/492+g== X-Proofpoint-ORIG-GUID: bXnCkdZSSNsOBKH9LIZiFYibrhMc9E3a 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=2026-04-27_01,2026-04-21_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 bulkscore=0 adultscore=0 suspectscore=0 phishscore=0 priorityscore=1501 spamscore=0 impostorscore=0 clxscore=1015 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2604200000 definitions=main-2604270067 On 4/23/2026 12:41 PM, Dmitry Baryshkov wrote: > On Thu, Apr 23, 2026 at 11:28:44AM +0800, Yongxing Mou wrote: >> >> >> On 4/22/2026 6:42 PM, Konrad Dybcio wrote: >>> The swing and preem settings for HBR3 look OK >>> >>> For DP / low-Vdiff: >>> >>> .swing_hbr3_hbr2 OK >>> .swing_hbr_rbr - I don't know. The docs are unclear whether the same >>> settings should be used for RBR and HBR3, but maybe? There's a >>> separate table for mini-DP but I doubt there's any poipu boards with >>> such a connector (maybe some obscure ones) >>> >>> .pre_emphasis_hbr3_hbr2 OK >>> .pre_emphasis_hbr_rbr same as above >>> >> Thanks for point this, so pre_emphasis_hbr_rbr same with >> pre_emphasis_hbr3_hbr2? I also don't get it's RBR or HBR3 from phy HPG. But >> now i think only eDP will be used in upstreamed poipu boards. i check the >> dts and not find any poipu boards will use DP mode(or mini DP).. > > After checking the HPG, could you please actually talk to the colleagues > who brough up the PHY on those platforms (with the downstreaam kernels)? > They might know the details not captured in the HPG. > The driver actually existed in the very first upstream version, but it didn’t use any tables back then. On the downstream side, I couldn’t find any 7nm eDP PHY implementations either. I tried reaching out to a few teams, but this platform is quite old and most people don’t really have context any more. My understanding is that it was primarily a compute-oriented chip, but I’m not very familiar with that code path myself. At this point, the only remaining option is to try contacting the hardware team to see if they have any additional insights. Since this is unlikely to be resolved quickly, I’d like to proceed with posting the next revision first. For SC8180X, it should only ever be using eDP mode.