linux-kernel - [PATCH v3] ASoC: qcom: soundwire: Enable soundwire bus clock for version 1.6

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Message-Id: <1633671232-30310-1-git-send-email-srivasam@codeaurora.org>
Date:   Fri,  8 Oct 2021 11:03:52 +0530
From:   Srinivasa Rao Mandadapu <srivasam@...eaurora.org>
To:     agross@...nel.org, bjorn.andersson@...aro.org, lgirdwood@...il.com,
        broonie@...nel.org, robh+dt@...nel.org, plai@...eaurora.org,
        bgoswami@...eaurora.org, perex@...ex.cz, tiwai@...e.com,
        srinivas.kandagatla@...aro.org, rohitkr@...eaurora.org,
        linux-arm-msm@...r.kernel.org, alsa-devel@...a-project.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        swboyd@...omium.org, judyhsiao@...omium.org
Cc:     Srinivasa Rao Mandadapu <srivasam@...eaurora.org>,
        Venkata Prasad Potturu <potturu@...eaurora.org>
Subject: [PATCH v3] ASoC: qcom: soundwire: Enable soundwire bus clock for version 1.6

Add support for soundwire 1.6 version to gate RX/TX bus clock.

Signed-off-by: Venkata Prasad Potturu <potturu@...eaurora.org>
Signed-off-by: Srinivasa Rao Mandadapu <srivasam@...eaurora.org>
---
Changes since v2:
    -- Update error check after ioremap.
Changes since v1:
    -- Add const name to mask value.

 drivers/soundwire/qcom.c | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/drivers/soundwire/qcom.c b/drivers/soundwire/qcom.c
index 0ef79d6..bd6fabd 100644
--- a/drivers/soundwire/qcom.c
+++ b/drivers/soundwire/qcom.c
@@ -109,6 +109,7 @@
 #define SWR_MAX_CMD_ID	14
 #define MAX_FIFO_RD_RETRY 3
 #define SWR_OVERFLOW_RETRY_COUNT 30
+#define SWRM_HCTL_REG_MASK ~BIT(1)
 
 struct qcom_swrm_port_config {
 	u8 si;
@@ -127,6 +128,7 @@ struct qcom_swrm_ctrl {
 	struct device *dev;
 	struct regmap *regmap;
 	void __iomem *mmio;
+	char __iomem *swrm_hctl_reg;
 	struct completion broadcast;
 	struct completion enumeration;
 	struct work_struct slave_work;
@@ -610,6 +612,12 @@ static int qcom_swrm_init(struct qcom_swrm_ctrl *ctrl)
 	val = FIELD_PREP(SWRM_MCP_FRAME_CTRL_BANK_ROW_CTRL_BMSK, ctrl->rows_index);
 	val |= FIELD_PREP(SWRM_MCP_FRAME_CTRL_BANK_COL_CTRL_BMSK, ctrl->cols_index);
 
+	if (ctrl->swrm_hctl_reg) {
+		val = ioread32(ctrl->swrm_hctl_reg);
+		val &= SWRM_HCTL_REG_MASK;
+		iowrite32(val, ctrl->swrm_hctl_reg);
+	}
+
 	ctrl->reg_write(ctrl, SWRM_MCP_FRAME_CTRL_BANK_ADDR(0), val);
 
 	/* Enable Auto enumeration */
@@ -1200,7 +1208,7 @@ static int qcom_swrm_probe(struct platform_device *pdev)
 	struct qcom_swrm_ctrl *ctrl;
 	const struct qcom_swrm_data *data;
 	int ret;
-	u32 val;
+	int val, swrm_hctl_reg = 0;
 
 	ctrl = devm_kzalloc(dev, sizeof(*ctrl), GFP_KERNEL);
 	if (!ctrl)
@@ -1251,6 +1259,11 @@ static int qcom_swrm_probe(struct platform_device *pdev)
 	ctrl->bus.port_ops = &qcom_swrm_port_ops;
 	ctrl->bus.compute_params = &qcom_swrm_compute_params;
 
+	if (!of_property_read_u32(dev->of_node, "qcom,swrm-hctl-reg", &swrm_hctl_reg)) {
+		ctrl->swrm_hctl_reg = devm_ioremap(&pdev->dev, swrm_hctl_reg, 0x4);
+		if (!ctrl->swrm_hctl_reg)
+			return -ENODEV;
+	}
 	ret = qcom_swrm_get_port_config(ctrl);
 	if (ret)
 		goto err_clk;
-- 
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is a member of Code Aurora Forum, a Linux Foundation Collaborative Project.