linux-kernel - [PATCH 3/7] soundwire: qcom: allow 16-bit sample interval for ports

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Message-Id: <20230331164530.227302-3-krzysztof.kozlowski@linaro.org>
Date:   Fri, 31 Mar 2023 18:45:26 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Vinod Koul <vkoul@...nel.org>,
        Bard Liao <yung-chuan.liao@...ux.intel.com>,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        Sanyog Kale <sanyog.r.kale@...el.com>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Rao Mandadapu <quic_srivasam@...cinc.com>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, alsa-devel@...a-project.org
Cc:     Patrick Lai <quic_plai@...cinc.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Subject: [PATCH 3/7] soundwire: qcom: allow 16-bit sample interval for ports

The port sample interval was always 16-bit, split into low and high
bytes.  This split was unnecessary, although harmless for older devices
because all of them used only lower byte (so values < 0xff).  With
support for Soundwire controller on Qualcomm SM8550 and its devices,
both bytes will be used, thus add a new 'qcom,ports-sinterval' property
to allow 16-bit sample intervals.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
---
 drivers/soundwire/qcom.c | 32 +++++++++++++++++++++++++-------
 1 file changed, 25 insertions(+), 7 deletions(-)

diff --git a/drivers/soundwire/qcom.c b/drivers/soundwire/qcom.c
index c296e0bf897b..80147fd0294b 100644
--- a/drivers/soundwire/qcom.c
+++ b/drivers/soundwire/qcom.c
@@ -95,6 +95,7 @@
 #define SWRM_DP_BLOCK_CTRL2_BANK(n, m)	(0x1130 + 0x100 * (n - 1) + 0x40 * m)
 #define SWRM_DP_PORT_HCTRL_BANK(n, m)	(0x1134 + 0x100 * (n - 1) + 0x40 * m)
 #define SWRM_DP_BLOCK_CTRL3_BANK(n, m)	(0x1138 + 0x100 * (n - 1) + 0x40 * m)
+#define SWRM_DP_SAMPLECTRL2_BANK(n, m)	(0x113C + 0x100 * (n - 1) + 0x40 * m)
 #define SWRM_DIN_DPn_PCM_PORT_CTRL(n)	(0x1054 + 0x100 * (n - 1))
 #define SWR_MSTR_MAX_REG_ADDR		(0x1740)
 
@@ -131,7 +132,7 @@ enum {
 };
 
 struct qcom_swrm_port_config {
-	u8 si;
+	u32 si;
 	u8 off1;
 	u8 off2;
 	u8 bp_mode;
@@ -806,12 +807,20 @@ static int qcom_swrm_transport_params(struct sdw_bus *bus,
 
 	value = pcfg->off1 << SWRM_DP_PORT_CTRL_OFFSET1_SHFT;
 	value |= pcfg->off2 << SWRM_DP_PORT_CTRL_OFFSET2_SHFT;
-	value |= pcfg->si;
+	value |= pcfg->si & 0xff;
 
 	ret = ctrl->reg_write(ctrl, reg, value);
 	if (ret)
 		goto err;
 
+	if (pcfg->si > 0xff) {
+		value = (pcfg->si >> 8) & 0xff;
+		reg = SWRM_DP_SAMPLECTRL2_BANK(params->port_num, bank);
+		ret = ctrl->reg_write(ctrl, reg, value);
+		if (ret)
+			goto err;
+	};
+
 	if (pcfg->lane_control != SWR_INVALID_PARAM) {
 		reg = SWRM_DP_PORT_CTRL_2_BANK(params->port_num, bank);
 		value = pcfg->lane_control;
@@ -1185,7 +1194,7 @@ static int qcom_swrm_get_port_config(struct qcom_swrm_ctrl *ctrl)
 	struct device_node *np = ctrl->dev->of_node;
 	u8 off1[QCOM_SDW_MAX_PORTS];
 	u8 off2[QCOM_SDW_MAX_PORTS];
-	u8 si[QCOM_SDW_MAX_PORTS];
+	u32 si[QCOM_SDW_MAX_PORTS];
 	u8 bp_mode[QCOM_SDW_MAX_PORTS] = { 0, };
 	u8 hstart[QCOM_SDW_MAX_PORTS];
 	u8 hstop[QCOM_SDW_MAX_PORTS];
@@ -1193,6 +1202,7 @@ static int qcom_swrm_get_port_config(struct qcom_swrm_ctrl *ctrl)
 	u8 blk_group_count[QCOM_SDW_MAX_PORTS];
 	u8 lane_control[QCOM_SDW_MAX_PORTS];
 	int i, ret, nports, val;
+	bool si_32 = false;
 
 	ctrl->reg_read(ctrl, SWRM_COMP_PARAMS, &val);
 
@@ -1236,9 +1246,14 @@ static int qcom_swrm_get_port_config(struct qcom_swrm_ctrl *ctrl)
 		return ret;
 
 	ret = of_property_read_u8_array(np, "qcom,ports-sinterval-low",
-					si, nports);
-	if (ret)
-		return ret;
+					(u8 *)si, nports);
+	if (ret) {
+		ret = of_property_read_u32_array(np, "qcom,ports-sinterval",
+						 si, nports);
+		if (ret)
+			return ret;
+		si_32 = true;
+	}
 
 	ret = of_property_read_u8_array(np, "qcom,ports-block-pack-mode",
 					bp_mode, nports);
@@ -1266,7 +1281,10 @@ static int qcom_swrm_get_port_config(struct qcom_swrm_ctrl *ctrl)
 
 	for (i = 0; i < nports; i++) {
 		/* Valid port number range is from 1-14 */
-		ctrl->pconfig[i + 1].si = si[i];
+		if (si_32)
+			ctrl->pconfig[i + 1].si = si[i];
+		else
+			ctrl->pconfig[i + 1].si = ((u8 *)si)[i];
 		ctrl->pconfig[i + 1].off1 = off1[i];
 		ctrl->pconfig[i + 1].off2 = off2[i];
 		ctrl->pconfig[i + 1].bp_mode = bp_mode[i];
-- 
2.34.1