linux-kernel - [PATCH v2] ASoC: qcom: soundwire: Add support for controlling audio CGCR from HLOS

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Date:   Wed, 18 May 2022 18:12:35 +0530
From:   Srinivasa Rao Mandadapu <quic_srivasam@...cinc.com>
To:     <agross@...nel.org>, <bjorn.andersson@...aro.org>,
        <lgirdwood@...il.com>, <broonie@...nel.org>, <robh+dt@...nel.org>,
        <quic_plai@...cinc.com>, <bgoswami@...cinc.com>, <perex@...ex.cz>,
        <tiwai@...e.com>, <srinivas.kandagatla@...aro.org>,
        <quic_rohkumar@...cinc.com>, <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>, <vkoul@...nel.org>
CC:     Srinivasa Rao Mandadapu <quic_srivasam@...cinc.com>
Subject: [PATCH v2] ASoC: qcom: soundwire: Add support for controlling audio CGCR from HLOS

Add support for controlling soundwire audio CGCR interface using clock
framework to make hclk ungating with software. As per new hardware
changes, software has to always ungate hclk if soundwire is operational
and keep it running. This requirement is for latest LPASS chipsets for
RX, TX and WSA path to work.

Signed-off-by: Srinivasa Rao Mandadapu <quic_srivasam@...cinc.com>
---
This patch set depends on:
    -- Clock driver patches for CGCR reset control support.
	--- https://patchwork.kernel.org/project/linux-arm-msm/list/?series=638002
	--- https://patchwork.kernel.org/project/linux-arm-msm/list/?series=637998	

Changes since v1:
    -- Add audio cgcr reset control in runtime PM resume handler.
    -- Update dependency list.

 drivers/soundwire/qcom.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/soundwire/qcom.c b/drivers/soundwire/qcom.c
index da1ad7e..445e481 100644
--- a/drivers/soundwire/qcom.c
+++ b/drivers/soundwire/qcom.c
@@ -13,6 +13,7 @@
 #include <linux/of_device.h>
 #include <linux/pm_runtime.h>
 #include <linux/regmap.h>
+#include <linux/reset.h>
 #include <linux/slab.h>
 #include <linux/pm_wakeirq.h>
 #include <linux/slimbus.h>
@@ -142,6 +143,7 @@ struct qcom_swrm_ctrl {
 	struct device *dev;
 	struct regmap *regmap;
 	void __iomem *mmio;
+	struct reset_control *audio_cgcr;
 #ifdef CONFIG_DEBUG_FS
 	struct dentry *debugfs;
 #endif
@@ -656,6 +658,8 @@ 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);
 
+	reset_control_reset(ctrl->audio_cgcr);
+
 	ctrl->reg_write(ctrl, SWRM_MCP_FRAME_CTRL_BANK_ADDR(0), val);
 
 	/* Enable Auto enumeration */
@@ -1333,6 +1337,10 @@ static int qcom_swrm_probe(struct platform_device *pdev)
 	ctrl->bus.compute_params = &qcom_swrm_compute_params;
 	ctrl->bus.clk_stop_timeout = 300;
 
+	ctrl->audio_cgcr = devm_reset_control_get_exclusive(dev, "swr_audio_cgcr");
+	if (IS_ERR(ctrl->audio_cgcr))
+		dev_err(dev, "Failed to get audio_cgcr reset required for soundwire-v1.6.0\n");
+
 	ret = qcom_swrm_get_port_config(ctrl);
 	if (ret)
 		goto err_clk;
@@ -1486,6 +1494,8 @@ static int __maybe_unused swrm_runtime_resume(struct device *dev)
 		qcom_swrm_get_device_status(ctrl);
 		sdw_handle_slave_status(&ctrl->bus, ctrl->status);
 	} else {
+		reset_control_reset(ctrl->audio_cgcr);
+
 		ctrl->reg_write(ctrl, SWRM_MCP_BUS_CTRL, SWRM_MCP_BUS_CLK_START);
 		ctrl->reg_write(ctrl, SWRM_INTERRUPT_CLEAR,
 			SWRM_INTERRUPT_STATUS_MASTER_CLASH_DET);
-- 
2.7.4