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[87.15.70.119]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-39d8938b7afsm1069482f8f.58.2025.04.09.02.18.18 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 09 Apr 2025 02:18:19 -0700 (PDT) From: Angelo Dureghello X-Google-Original-From: Angelo Dureghello Date: Wed, 09 Apr 2025 11:16:54 +0200 Subject: [PATCH v2 1/2] iio: dac: adi-axi-dac: fix bus read 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: <20250409-ad3552r-fix-bus-read-v2-1-34d3b21e8ca0@baylibre.com> References: <20250409-ad3552r-fix-bus-read-v2-0-34d3b21e8ca0@baylibre.com> In-Reply-To: <20250409-ad3552r-fix-bus-read-v2-0-34d3b21e8ca0@baylibre.com> To: Nuno Sa , Lars-Peter Clausen , Michael Hennerich , Jonathan Cameron , David Lechner , Andy Shevchenko Cc: linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org, Jonathan Cameron , Angelo Dureghello X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=1333; i=adureghello@baylibre.com; h=from:subject:message-id; bh=9pHPKsKzptvjYiQOA8UzTeuM77FIRRsobVc0fiDL1Ac=; b=owGbwMvMwCXGf3bn1e/btlsznlZLYkj/Zs13fbkTy0wpduvtApn7d1hVtBbc/ivRrvDYkGF6y cR+qaU7O0pZGMS4GGTFFFnqEiNMQm+HSikvYJwNM4eVCWQIAxenAExknxbD/xAO1WMX3uZO9Da8 08VTts92WebTEwul8oTa5724+2ZhWirDPwtvq6+bT9hWZ9pbXcxe03hY2f3bOTvFxftqDAXca2Y 94QQA X-Developer-Key: i=adureghello@baylibre.com; a=openpgp; fpr=703CDFAD8B573EB00850E38366D1CB9419AF3953 From: Angelo Dureghello Fix bus read function. Testing the driver, on a random basis, wrong reads was detected, mainly by a wrong DAC chip ID read at first boot. Before reading the expected value from the AXI regmap, need always to wait for busy flag to be cleared. Fixes: e61d7178429a ("iio: dac: adi-axi-dac: extend features") Signed-off-by: Angelo Dureghello --- drivers/iio/dac/adi-axi-dac.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/iio/dac/adi-axi-dac.c b/drivers/iio/dac/adi-axi-dac.c index 8ed5ad1fa24cef649056bc5f4ca80abbf28b9323..5ee077c58d7f9730aec8a9c9dff= 5b84108b3a47e 100644 --- a/drivers/iio/dac/adi-axi-dac.c +++ b/drivers/iio/dac/adi-axi-dac.c @@ -760,6 +760,7 @@ static int axi_dac_bus_reg_read(struct iio_backend *bac= k, u32 reg, u32 *val, { struct axi_dac_state *st =3D iio_backend_get_priv(back); int ret; + u32 ival; =20 guard(mutex)(&st->lock); =20 @@ -772,6 +773,13 @@ static int axi_dac_bus_reg_read(struct iio_backend *ba= ck, u32 reg, u32 *val, if (ret) return ret; =20 + ret =3D regmap_read_poll_timeout(st->regmap, + AXI_DAC_UI_STATUS_REG, ival, + FIELD_GET(AXI_DAC_UI_STATUS_IF_BUSY, ival) =3D=3D 0, + 10, 100 * KILO); + if (ret) + return ret; + return regmap_read(st->regmap, AXI_DAC_CUSTOM_RD_REG, val); } =20 --=20 2.49.0