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Wed, 19 Feb 2025 09:56:23 +0000 (GMT) Received: from nalasex01c.na.qualcomm.com (nalasex01c.na.qualcomm.com [10.47.97.35]) by NALASPPMTA02.qualcomm.com (8.18.1.2/8.18.1.2) with ESMTPS id 51J9uMhj024875 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 19 Feb 2025 09:56:22 GMT Received: from [10.64.68.119] (10.80.80.8) by nalasex01c.na.qualcomm.com (10.47.97.35) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.9; Wed, 19 Feb 2025 01:56:16 -0800 Message-ID: <0171746e-1d3c-42e5-9cde-7dcf2708ffc3@quicinc.com> Date: Wed, 19 Feb 2025 17:56:14 +0800 Precedence: bulk X-Mailing-List: linux-arm-msm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 1/4] dt-bindings: display/msm: Redocument the dp-controller for QCS8300 To: Dmitry Baryshkov , Krzysztof Kozlowski CC: Rob Clark , Abhinav Kumar , Sean Paul , Marijn Suijten , David Airlie , "Simona Vetter" , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Kuogee Hsieh , Bjorn Andersson , Konrad Dybcio , , , , , References: <20250212-mst_qcs8300-v1-0-38a8aa08394b@quicinc.com> <20250212-mst_qcs8300-v1-1-38a8aa08394b@quicinc.com> Content-Language: en-US From: Yongxing Mou In-Reply-To: Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 7bit X-ClientProxiedBy: nasanex01b.na.qualcomm.com (10.46.141.250) To nalasex01c.na.qualcomm.com (10.47.97.35) X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-GUID: KfHerWKYaQvqFn9ajLKEt9yanHq-fSCx X-Proofpoint-ORIG-GUID: KfHerWKYaQvqFn9ajLKEt9yanHq-fSCx X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1057,Hydra:6.0.680,FMLib:17.12.68.34 definitions=2025-02-19_04,2025-02-18_01,2024-11-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 clxscore=1015 adultscore=0 malwarescore=0 mlxscore=0 priorityscore=1501 lowpriorityscore=0 mlxlogscore=821 suspectscore=0 phishscore=0 spamscore=0 impostorscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2502100000 definitions=main-2502190079 On 2025/2/12 20:26, Dmitry Baryshkov wrote: > On Wed, 12 Feb 2025 at 12:54, Krzysztof Kozlowski wrote: >> >> On 12/02/2025 11:41, Dmitry Baryshkov wrote: >>> On Wed, Feb 12, 2025 at 03:12:24PM +0800, Yongxing Mou wrote: >>>> We need to enable mst for qcs8300, dp0 controller will support 2 streams >>>> output. So not reuse sm8650 dp controller driver and will add a new driver >>>> patch for qcs8300 mst feature. Modify the corresponding dt-bingding file >>>> to compatible with the qcs8300-dp. >>> >>> NAK for a different reason: QCS8300 is still compatible with SM8650. >>> Enable features instead of randomly reshuffle compats. In this case, >>> enable MST for both architectures. >>> >> So the original patch was probably correct... > > I have no idea. I'd let Yongxing Mou to comment on this. It would be > nice instead of getting a lengthy explanation of obvious items to get > an answer to an actual question: is QCS8300 compatible with SM8650 or > not. In other words whether they can support the same number of MST > streams on each controller or not. > Hi, in hardware, the SM8650's DP controller supports 2 INTFs, while the QCS8300's DP0 controller supports 4 INTFs.In sst mode, only one INTF will be used, they are same, but for MST, sm8650 supports 2 streams while qcs8300 support 4 streams. Thanks.