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[199.106.103.254]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-2c3c4aac86esm6776668eec.12.2026.03.30.04.32.40 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 30 Mar 2026 04:32:43 -0700 (PDT) Message-ID: <99d6795e-1cea-4e7f-b8b6-97f55af55d8d@oss.qualcomm.com> Date: Mon, 30 Mar 2026 19:32:38 +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 v3 12/38] drm/msm/dp: introduce max_streams for DP controller MST support To: Dmitry Baryshkov Cc: Rob Clark , Dmitry Baryshkov , Abhinav Kumar , Jessica Zhang , Sean Paul , Marijn Suijten , David Airlie , Simona Vetter , linux-arm-msm@vger.kernel.org, dri-devel@lists.freedesktop.org, freedreno@lists.freedesktop.org, linux-kernel@vger.kernel.org, Abhinav Kumar References: <20250825-msm-dp-mst-v3-0-01faacfcdedd@oss.qualcomm.com> <20250825-msm-dp-mst-v3-12-01faacfcdedd@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-Spam-Details-Enc: AW1haW4tMjYwMzMwMDA5MCBTYWx0ZWRfXyhSCyTSEk83e ZcVahCTEZLwwL9wCUDGbC1+AYlBGtbJo6QABSa+S4r4+P8ihvP2nIL7d9h2lM4KUF1i43EGv7sP kahNOQH0+NPzkMSaQ3w6GaUnk0lFllr/H+/oyvKrWnpmO+sfrwoGiho/drPmc7rfAa+ALDoTlqH 1JcFySghniEpDs0nF7N+MW0alJhFN2ngPfzHGTTQmCpNEQZdHTUmtSpSD6kIiYmUWJ544PL4HRe kYgb8WN7M0OpbpOfIqKPO8YaXeeeFbdN293aDhkUp/gVct2247NIYfT7FTLM3j44T9A9qjHmZ21 FnTAN9xqX71KE3TTJxTGcaW5E6Oe2EsfR7iWapSsYaQgo9XlUaThXbhXCqiDxx3VeWaj5+MtVvu b+Np+ZYm3XNEHUCB0qfWBgl1nevHSjRQN0AR0FjKgxPEjQ1h5cgS2opbHEfh7iaA+8vTxBzMqXs ZF+lNQKilIOhL7RJGgQ== X-Authority-Analysis: v=2.4 cv=EIQLElZC c=1 sm=1 tr=0 ts=69ca5f60 cx=c_pps a=Uww141gWH0fZj/3QKPojxA==:117 a=JYp8KDb2vCoCEuGobkYCKw==:17 a=IkcTkHD0fZMA:10 a=Yq5XynenixoA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=_glEPmIy2e8OvE2BGh3C:22 a=COk6AnOGAAAA:8 a=EUspDBNiAAAA:8 a=zP8nz7a8HkQHIvqbjmkA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 a=PxkB5W3o20Ba91AHUih5:22 a=TjNXssC_j7lpFel5tvFf:22 X-Proofpoint-GUID: kVUNpKI1FbOeZjspsqMskabRGgT-2VtZ X-Proofpoint-ORIG-GUID: kVUNpKI1FbOeZjspsqMskabRGgT-2VtZ 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=2026-03-29_05,2026-03-28_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 lowpriorityscore=0 impostorscore=0 malwarescore=0 adultscore=0 phishscore=0 spamscore=0 clxscore=1015 priorityscore=1501 bulkscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2603050001 definitions=main-2603300090 On 3/30/2026 6:35 PM, Dmitry Baryshkov wrote: > On Mon, Mar 30, 2026 at 05:57:13PM +0800, Yongxing Mou wrote: >> >> >> On 8/26/2025 1:42 AM, Dmitry Baryshkov wrote: >>> On Mon, Aug 25, 2025 at 10:15:58PM +0800, Yongxing Mou wrote: >>>> From: Abhinav Kumar >>>> >>>> Introduce the `mst_streams` field in each DP controller descriptor to >>>> specify the number of supported MST streams. Most platforms support 2 or >>>> 4 MST streams, while platforms without MST support default to a single >>>> stream (`DEFAULT_STREAM_COUNT = 1`). >>>> >>>> This change also accounts for platforms with asymmetric stream support, >>>> e.g., DP0 supporting 4 streams and DP1 supporting 2. >>> >>> How? >>> >> Each DP controller have it own msm_dp_desc ... > > Why do you need to mention it? > Sorry, I may have misunderstood your “How?”. Could you please clarify what aspect you are referring to (commit message wording vs. the actual implementation)? >>>> >>>> Signed-off-by: Abhinav Kumar >>>> Signed-off-by: Yongxing Mou >>>> --- >>>> drivers/gpu/drm/msm/dp/dp_display.c | 21 +++++++++++++++++++++ >>>> drivers/gpu/drm/msm/dp/dp_display.h | 1 + >>>> 2 files changed, 22 insertions(+) >>>> >>>> diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c >>>> index 78d932bceb581ee54116926506b1025bd159108f..a8477a0a180137f15cbb1401c3964636aa32626c 100644 >>>> --- a/drivers/gpu/drm/msm/dp/dp_display.c >>>> +++ b/drivers/gpu/drm/msm/dp/dp_display.c >>>> @@ -33,6 +33,7 @@ module_param(psr_enabled, bool, 0); >>>> MODULE_PARM_DESC(psr_enabled, "enable PSR for eDP and DP displays"); >>>> #define HPD_STRING_SIZE 30 >>>> +#define DEFAULT_STREAM_COUNT 1 >>>> enum { >>>> ISR_DISCONNECTED, >>>> @@ -52,6 +53,7 @@ struct msm_dp_display_private { >>>> bool core_initialized; >>>> bool phy_initialized; >>>> bool audio_supported; >>>> + bool mst_supported; >>> >>> Why do we need the separate boot field here? Isn't it enough to check the max_stream? >>> >> If remove mst_supported, condition "mst_streams > 1" will appear in multiple >> places. > > And so what? If you want, extract the function, but don't add > duplicating data. > Got it. will remove this "mst_supported". >>>> struct drm_device *drm_dev; >