[PATCH] ASoC: qcom: soundwire: Add support for controlling audio CGCR from HLOS

[Srinivasa Rao Mandadapu]

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 at quicinc.com>
Co-developed-by: Venkata Prasad Potturu <quic_potturu at quicinc.com>
Signed-off-by: Venkata Prasad Potturu <quic_potturu at quicinc.com>
---
This patch set depends on:
	-- Clock driver patches with reset control support, yet to be posted.

 drivers/soundwire/qcom.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/soundwire/qcom.c b/drivers/soundwire/qcom.c
index fb183bd..440aad8 100644
--- a/drivers/soundwire/qcom.c
+++ b/drivers/soundwire/qcom.c
@@ -12,6 +12,7 @@
 #include <linux/of_irq.h>
 #include <linux/of_device.h>
 #include <linux/regmap.h>
+#include <linux/reset.h>
 #include <linux/slab.h>
 #include <linux/slimbus.h>
 #include <linux/soundwire/sdw.h>
@@ -129,6 +130,7 @@ 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
@@ -618,6 +620,8 @@ 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 */
@@ -1269,6 +1273,9 @@ static int qcom_swrm_probe(struct platform_device *pdev)
 	ctrl->bus.ops = &qcom_swrm_ops;
 	ctrl->bus.port_ops = &qcom_swrm_port_ops;
 	ctrl->bus.compute_params = &qcom_swrm_compute_params;
+	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)
-- 
2.7.4