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[78.88.45.245]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-66e034bb78esm5207821a12.24.2026.04.08.02.06.43 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 08 Apr 2026 02:06:45 -0700 (PDT) Message-ID: <29a7dd01-7513-4fe5-8546-d57757b3b2d0@oss.qualcomm.com> Date: Wed, 8 Apr 2026 11:06:42 +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: [PATCH 12/12] arm64: dts: qcom: qcs6490-radxa-dragon-q6a: add LPASS CPU audio variant To: Xilin Wu , Bjorn Andersson , Konrad Dybcio , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Dmitry Baryshkov , Liam Girdwood , Mark Brown , Judy Hsiao Cc: linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-sound@vger.kernel.org References: <20260407-dragon-q6a-feat-fixes-v1-0-14aca49dde3d@radxa.com> <20260407-dragon-q6a-feat-fixes-v1-12-14aca49dde3d@radxa.com> Content-Language: en-US From: Konrad Dybcio In-Reply-To: <20260407-dragon-q6a-feat-fixes-v1-12-14aca49dde3d@radxa.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Authority-Analysis: v=2.4 cv=drPrzVg4 c=1 sm=1 tr=0 ts=69d61aa8 cx=c_pps a=HLyN3IcIa5EE8TELMZ618Q==:117 a=FpWmc02/iXfjRdCD7H54yg==:17 a=IkcTkHD0fZMA:10 a=A5OVakUREuEA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=YMgV9FUhrdKAYTUUvYB2:22 a=g-AGuyTcngxyzYSZuwMA:9 a=QEXdDO2ut3YA:10 a=zZCYzV9kfG8A:10 a=bTQJ7kPSJx9SKPbeHEYW:22 X-Proofpoint-ORIG-GUID: VdPF2Y0GNeO_QeBkud2Vlwp6P6R5ZGJ3 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNDA4MDA4MSBTYWx0ZWRfX7g6j74xunufp R9Z7+EUAVRbAdQ0siQOTadMv51XK7+bX6CDkhehsBd8UhUBJlAhLsJVr57v1eGj6CmAXt50YcuP Ad0l3Scle+IA8B4hIs0dkATt4QD21FQ1B6doJTTyJSkH8rs+M0CSF2byQ7tJOnd5FMNHYsdU0e0 gvi0LBOimYC+KgqSaDnYYbu3NHaCBUVMuLgJgHc8hwqZaiLvA8ikDFg//FPmuqLcSBD7UWQ3zSw cnHJ1bMknqFoP024cOLnxv0bqljWfHCEZuA7/tInv2IEkuW76jIV9kfGk0H7URNGSAuQA4snk2M MiZBGkXfNPPyLLdFdlUyi499RVEj/HBVuNzgFTD5MHE0U6j8muNg1yy1QoqmmkHIutBONxYpPP8 tWb2DJpqrLibFWNB0ZVH9HzB26rhNkdLoYugKoWbki1FSO+hByuvSCoQ6PT0qu/eY74bxHiHk0d iYWVXQp9Wd2P9f5yWJg== X-Proofpoint-GUID: VdPF2Y0GNeO_QeBkud2Vlwp6P6R5ZGJ3 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=2026-04-08_03,2026-04-07_05,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 lowpriorityscore=0 spamscore=0 clxscore=1015 malwarescore=0 bulkscore=0 impostorscore=0 phishscore=0 priorityscore=1501 suspectscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2604010000 definitions=main-2604080081 On 4/7/26 5:20 PM, Xilin Wu wrote: > Add a qcs6490-radxa-dragon-q6a-lpass-cpu.dts variant for debugging and > bring-up of the host-controlled LPASS audio path on the Radxa Dragon > Q6A. > > This variant enables the LPASS blocks and codec macros needed by the > lpass-cpu driver, wires WCD9380 playback/capture and DisplayPort audio > to the LPASS CDC DMA and DP interfaces, and disables remoteproc_adsp so > that the audio hardware is owned directly by Linux. > > This DTB is an optional configuration for systems booted with the kernel > running at EL2, where direct CPU access to the LPASS hardware is > available. It is useful for users who need low-latency and fully > controllable audio. I believe on Chrome platforms it was done this way because at some point it was determined that they would specifically like not to use the DSP. I think this is more of a hack than anything else.. but at the end of the commit message you mention low latency - is the impact actually measurable? Konrad