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[2403:580a:80ed:0:4835:5a07:49e7:f115]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-231d4edd259sm41956115ad.256.2025.05.18.03.51.39 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 18 May 2025 03:51:42 -0700 (PDT) From: James Calligeros Date: Sun, 18 May 2025 20:50:54 +1000 Subject: [PATCH 9/9] ASoC: apple: mca: Add delay after configuring clock Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20250518-mca-fixes-v1-9-ee1015a695f6@gmail.com> References: <20250518-mca-fixes-v1-0-ee1015a695f6@gmail.com> In-Reply-To: <20250518-mca-fixes-v1-0-ee1015a695f6@gmail.com> To: =?utf-8?q?Martin_Povi=C5=A1er?= , Liam Girdwood , Mark Brown , Jaroslav Kysela , Takashi Iwai Cc: asahi@lists.linux.dev, linux-sound@vger.kernel.org, linux-kernel@vger.kernel.org, Hector Martin , James Calligeros X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=1096; i=jcalligeros99@gmail.com; h=from:subject:message-id; bh=ekpJUrgwslgSSm//rnVrNbH1x1uOEDjoGU49rCtKwNc=; b=owGbwMvMwCV2xczoYuD3ygTG02pJDBmau2dcNBfZyniLo7vUzoPHy1xpdcuznHhb69lLBLpuv vxX8jKmo5SFQYyLQVZMkWVDk5DHbCO2m/0ilXth5rAygQxh4OIUgImU7WL4n6NfVFyh1Zrcv8H9 2XSJGw4H/jy749UbaLyfJXrzBPGQFYwMHZr7Um2uGF5P9DrYfIOZxdJvxmwBg68eoqs+bd5s3Hi WBQA= X-Developer-Key: i=jcalligeros99@gmail.com; a=openpgp; fpr=B08212489B3206D98F1479BDD43632D151F77960 From: Hector Martin Right after the early FE setup, ADMAC gets told to start the DMA. This can end up in a weird "slip" state with the channels transposed. Waiting a bit fixes this; presumably this allows the clock to stabilize. Signed-off-by: Hector Martin Signed-off-by: James Calligeros --- sound/soc/apple/mca.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/sound/soc/apple/mca.c b/sound/soc/apple/mca.c index 25d04b3d8a57a8551f2ac1c0cd2dbf2997d907e8..1c664c204504174df1d0af3cafb= e25235c678687 100644 --- a/sound/soc/apple/mca.c +++ b/sound/soc/apple/mca.c @@ -231,6 +231,12 @@ static void mca_fe_early_trigger(struct snd_pcm_substr= eam *substream, int cmd, FIELD_PREP(SERDES_CONF_SYNC_SEL, 0)); mca_modify(cl, serdes_conf, SERDES_CONF_SYNC_SEL, FIELD_PREP(SERDES_CONF_SYNC_SEL, cl->no + 1)); + /* + * ADMAC gets started right after this. This delay seems + * to be needed for that to be reliable, e.g. ensure the + * clock is stable? + */ + udelay(100); break; default: break; --=20 2.49.0