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Tue, 27 Oct 2026 03:12:19 -0700 (PDT) Received: from [10.219.49.187] ([202.46.23.19]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-cd8ccc666d1sm2442498a12.16.2026.10.27.03.12.15 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 27 Oct 2026 03:12:19 -0700 (PDT) Message-ID: <7f405774-f6e4-40da-994b-02c8dfe8d648@oss.qualcomm.com> Date: Tue, 27 Oct 2026 15:42:14 +0530 X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] ASoC: qcom: sm8250: Limit RX digital gain to 0 dB To: Filippo Falezza , Srinivas Kandagatla , Liam Girdwood , Mark Brown , Jaroslav Kysela , Takashi Iwai Cc: linux-sound@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org References: <20261027-sm8250-rx-gain-v1-1-386ee6d971db@gmail.com> Content-Language: en-US From: Prasad Kumpatla In-Reply-To: <20261027-sm8250-rx-gain-v1-1-386ee6d971db@gmail.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMDI3MDA0MCBTYWx0ZWRfX2rcW3xabDgZw OISkN81rOdz+mSIrJsabsRNwoyb/IH3cdcxpUFN6AWxrslUJSuNMcGwqy5rMfVx9Q1TxHDFDmzG jUb42oMPdrF8tqeyFnLjKvKWYhv854msPoKnFB6q1lrImvOQsvUR2DUC1ER1lD0VRTVsPJ0kT+O Jff3ODaslo+QCBaW0oVg1QEMnlCSVdiaz2qeknhEbTEoxdGEdHBiuULatFkVpobLaN8mYgIuE6t H46nCJLSkyPEpaKTjVWEsjcAURE5ISz7HPx2pqGFsIu+xChC97DFI4CvmXD8tJ88xvWkOiBYlfn f78f31oIcP3agQB5qkbQoHRlFySLc59jlGiExX2Ct4CRN3p4mDg2s5w4En4ZWf2TtIPymKVL5CT /s009v7JGn4FWXFT0BNzMCAEz62LVrNEhn8MZel0MlRjo2vGYozZ+MJbaNStMauiN5Cdq52kpOA AcE8lA6QPMaoSbLyDmQ== X-Proofpoint-GUID: DSporaCxZpywS5FSQWUH-OF0XuvFCbqb X-Proofpoint-Spam-Info: AW1haW4tMjYxMDI3MDA0MCBTYWx0ZWRfX+2PvKfBvpSSX emQgcCmt/nUlY9nhKH+/hTZKPq29u76dsCd6tYQmlOKywECSmHBxJYt4O9zVILECDdBJIyppeQ9 bGAbDgu9PuNQppJU+N7kx5kpaxyanfs= X-Authority-Analysis: v=2.4 cv=PsYG/AM3 c=1 sm=1 tr=0 ts=6ae07905 cx=c_pps a=m5Vt/hrsBiPMCU0y4gIsQw==:117 a=j4ogTh8yFefVWWEFDRgCtg==:17 a=IkcTkHD0fZMA:10 a=660iZSQnnn4A:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=3WHJM1ZQz_JShphwDgj5:22 a=pGLkceISAAAA:8 a=EUspDBNiAAAA:8 a=PDEUqFOJZ0MzX4fEFhsA:9 a=QEXdDO2ut3YA:10 a=IoOABgeZipijB_acs4fv:22 X-Proofpoint-ORIG-GUID: DSporaCxZpywS5FSQWUH-OF0XuvFCbqb X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.138,FMLib:17.12.100.49 definitions=2026-10-27_02,2026-10-21_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 spamscore=0 phishscore=0 adultscore=0 lowpriorityscore=0 priorityscore=1501 bulkscore=0 impostorscore=0 clxscore=1015 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2610190000 definitions=main-2610270040 On 10/27/2026 7:03 AM, Filippo Falezza wrote: > The RX macro interpolator gains ("RX_RXn Digital Volume") run from > -84 dB to +40 dB. PipeWire and PulseAudio map full volume to the top of > a hardware control's range, so a UCM device that uses one of them as > its volume control plays 40 dB hot at 100% and clips. > > Set a platform limit of 84 (0 dB) on the RX0, RX1 and RX2 interpolator > gains when the RX codec DMA link is initialised, the way the sc8280xp > and x1e80100 machine drivers limit their WSA gains. 0 dB is the default > of these controls and the value alsa-ucm-conf's rx-macro init sets, so > existing configurations are unaffected. A control that does not exist > on a board is skipped. > > Signed-off-by: Filippo Falezza > --- LGTM. Reviewed-by: Prasad Kumpatla Thanks, Prasad