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Wed, 04 Nov 2026 07:46:55 -0800 (PST) Received: from d.home.yangfl.dn42 ([2a09:bac1:7680:28::4:396]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-cdb4694a0e0sm1372632a12.20.2026.11.04.07.46.52 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 04 Nov 2026 07:46:55 -0800 (PST) From: David Yang To: dmaengine@vger.kernel.org Cc: David Yang , Vinod Koul , Frank Li , Philipp Zabel , linux-kernel@vger.kernel.org Subject: [PATCH 1/2] dmaengine: pl08x: Release the reset before reading registers Date: Wed, 4 Nov 2026 23:45:38 +0800 Message-ID: <20261104154542.3131916-2-mmyangfl@gmail.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20261104154542.3131916-1-mmyangfl@gmail.com> References: <20261104154542.3131916-1-mmyangfl@gmail.com> 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 Content-Transfer-Encoding: 8bit amba_read_periphid() happens to release the reset. A node that carries arm,primecell-periphid never reaches it. Release the reset ourselves. Signed-off-by: David Yang --- drivers/dma/amba-pl08x.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/drivers/dma/amba-pl08x.c b/drivers/dma/amba-pl08x.c index 543c2eb8cfa8..33ad6c42cd7f 100644 --- a/drivers/dma/amba-pl08x.c +++ b/drivers/dma/amba-pl08x.c @@ -75,6 +75,7 @@ #include #include #include +#include #include #include #include @@ -2695,6 +2696,7 @@ static int pl08x_probe(struct amba_device *adev, const struct amba_id *id) struct pl08x_driver_data *pl08x; struct vendor_data *vd = id->data; struct device_node *np = adev->dev.of_node; + struct reset_control *rst; u32 tsfr_size; int ret = 0; int i; @@ -2725,6 +2727,16 @@ static int pl08x_probe(struct amba_device *adev, const struct amba_id *id) goto out_no_ioremap; } + /* Release the reset before reading registers */ + rst = devm_reset_control_get_optional_exclusive(&adev->dev, NULL); + if (IS_ERR(rst)) { + ret = PTR_ERR(rst); + goto out_no_ioremap; + } + ret = reset_control_deassert(rst); + if (ret) + goto out_no_ioremap; + if (vd->ftdmac020) { u32 val; -- 2.53.0