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From:   Charles Keepax <ckeepax@opensource.cirrus.com>
To:     <vkoul@kernel.org>
CC:     <yung-chuan.liao@linux.intel.com>,
        <pierre-louis.bossart@linux.intel.com>, <sanyog.r.kale@intel.com>,
        <alsa-devel@alsa-project.org>, <linux-kernel@vger.kernel.org>,
        <patches@opensource.cirrus.com>
Subject: [PATCH v3 4/4] soundwire: stream: Move remaining register accesses over to no_pm
Date:   Mon, 21 Nov 2022 14:14:06 +0000
Message-ID: <20221121141406.3840561-5-ckeepax@opensource.cirrus.com>
In-Reply-To: <20221121141406.3840561-1-ckeepax@opensource.cirrus.com>
References: <20221121141406.3840561-1-ckeepax@opensource.cirrus.com>
MIME-Version: 1.0
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Precedence: bulk

There is no need to play with the runtime reference everytime a register
is accessed. All the remaining "pm" style register accesses trace back
to 4 functions:

sdw_prepare_stream
sdw_deprepare_stream
sdw_enable_stream
sdw_disable_stream

Any sensible implementation will need to hold a runtime reference
across all those functions, it makes no sense to be allowing the
device/bus to suspend whilst streams are being prepared/enabled. And
certainly in the case of the all existing users, they all call these
functions from hw_params/prepare/trigger/hw_free callbacks in ALSA,
which will have already runtime resumed all the audio devices
associated during the open callback.

Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
---

No changes since v2.

 drivers/soundwire/bus.c    |  2 +-
 drivers/soundwire/stream.c | 30 +++++++++++++++---------------
 2 files changed, 16 insertions(+), 16 deletions(-)

diff --git a/drivers/soundwire/bus.c b/drivers/soundwire/bus.c
index ef4878258afad..d87a188fcce1e 100644
--- a/drivers/soundwire/bus.c
+++ b/drivers/soundwire/bus.c
@@ -1214,7 +1214,7 @@ int sdw_configure_dpn_intr(struct sdw_slave *slave,
 		val &= ~SDW_DPN_INT_PORT_READY;
 	}
 
-	ret = sdw_update(slave, addr, (mask | SDW_DPN_INT_PORT_READY), val);
+	ret = sdw_update_no_pm(slave, addr, (mask | SDW_DPN_INT_PORT_READY), val);
 	if (ret < 0)
 		dev_err(&slave->dev,
 			"SDW_DPN_INTMASK write failed:%d\n", val);
diff --git a/drivers/soundwire/stream.c b/drivers/soundwire/stream.c
index bd502368339e5..df3b36670df4c 100644
--- a/drivers/soundwire/stream.c
+++ b/drivers/soundwire/stream.c
@@ -81,14 +81,14 @@ static int _sdw_program_slave_port_params(struct sdw_bus *bus,
 	}
 
 	/* Program DPN_OffsetCtrl2 registers */
-	ret = sdw_write(slave, addr1, t_params->offset2);
+	ret = sdw_write_no_pm(slave, addr1, t_params->offset2);
 	if (ret < 0) {
 		dev_err(bus->dev, "DPN_OffsetCtrl2 register write failed\n");
 		return ret;
 	}
 
 	/* Program DPN_BlockCtrl3 register */
-	ret = sdw_write(slave, addr2, t_params->blk_pkg_mode);
+	ret = sdw_write_no_pm(slave, addr2, t_params->blk_pkg_mode);
 	if (ret < 0) {
 		dev_err(bus->dev, "DPN_BlockCtrl3 register write failed\n");
 		return ret;
@@ -105,7 +105,7 @@ static int _sdw_program_slave_port_params(struct sdw_bus *bus,
 	/* Program DPN_SampleCtrl2 register */
 	wbuf = FIELD_GET(SDW_DPN_SAMPLECTRL_HIGH, t_params->sample_interval - 1);
 
-	ret = sdw_write(slave, addr3, wbuf);
+	ret = sdw_write_no_pm(slave, addr3, wbuf);
 	if (ret < 0) {
 		dev_err(bus->dev, "DPN_SampleCtrl2 register write failed\n");
 		return ret;
@@ -115,7 +115,7 @@ static int _sdw_program_slave_port_params(struct sdw_bus *bus,
 	wbuf = FIELD_PREP(SDW_DPN_HCTRL_HSTART, t_params->hstart);
 	wbuf |= FIELD_PREP(SDW_DPN_HCTRL_HSTOP, t_params->hstop);
 
-	ret = sdw_write(slave, addr4, wbuf);
+	ret = sdw_write_no_pm(slave, addr4, wbuf);
 	if (ret < 0)
 		dev_err(bus->dev, "DPN_HCtrl register write failed\n");
 
@@ -163,7 +163,7 @@ static int sdw_program_slave_port_params(struct sdw_bus *bus,
 	wbuf = FIELD_PREP(SDW_DPN_PORTCTRL_DATAMODE, p_params->data_mode);
 	wbuf |= FIELD_PREP(SDW_DPN_PORTCTRL_FLOWMODE, p_params->flow_mode);
 
-	ret = sdw_update(s_rt->slave, addr1, 0xF, wbuf);
+	ret = sdw_update_no_pm(s_rt->slave, addr1, 0xF, wbuf);
 	if (ret < 0) {
 		dev_err(&s_rt->slave->dev,
 			"DPN_PortCtrl register write failed for port %d\n",
@@ -173,7 +173,7 @@ static int sdw_program_slave_port_params(struct sdw_bus *bus,
 
 	if (!dpn_prop->read_only_wordlength) {
 		/* Program DPN_BlockCtrl1 register */
-		ret = sdw_write(s_rt->slave, addr2, (p_params->bps - 1));
+		ret = sdw_write_no_pm(s_rt->slave, addr2, (p_params->bps - 1));
 		if (ret < 0) {
 			dev_err(&s_rt->slave->dev,
 				"DPN_BlockCtrl1 register write failed for port %d\n",
@@ -184,7 +184,7 @@ static int sdw_program_slave_port_params(struct sdw_bus *bus,
 
 	/* Program DPN_SampleCtrl1 register */
 	wbuf = (t_params->sample_interval - 1) & SDW_DPN_SAMPLECTRL_LOW;
-	ret = sdw_write(s_rt->slave, addr3, wbuf);
+	ret = sdw_write_no_pm(s_rt->slave, addr3, wbuf);
 	if (ret < 0) {
 		dev_err(&s_rt->slave->dev,
 			"DPN_SampleCtrl1 register write failed for port %d\n",
@@ -193,7 +193,7 @@ static int sdw_program_slave_port_params(struct sdw_bus *bus,
 	}
 
 	/* Program DPN_OffsetCtrl1 registers */
-	ret = sdw_write(s_rt->slave, addr4, t_params->offset1);
+	ret = sdw_write_no_pm(s_rt->slave, addr4, t_params->offset1);
 	if (ret < 0) {
 		dev_err(&s_rt->slave->dev,
 			"DPN_OffsetCtrl1 register write failed for port %d\n",
@@ -203,7 +203,7 @@ static int sdw_program_slave_port_params(struct sdw_bus *bus,
 
 	/* Program DPN_BlockCtrl2 register*/
 	if (t_params->blk_grp_ctrl_valid) {
-		ret = sdw_write(s_rt->slave, addr5, t_params->blk_grp_ctrl);
+		ret = sdw_write_no_pm(s_rt->slave, addr5, t_params->blk_grp_ctrl);
 		if (ret < 0) {
 			dev_err(&s_rt->slave->dev,
 				"DPN_BlockCtrl2 reg write failed for port %d\n",
@@ -214,7 +214,7 @@ static int sdw_program_slave_port_params(struct sdw_bus *bus,
 
 	/* program DPN_LaneCtrl register */
 	if (slave_prop->lane_control_support) {
-		ret = sdw_write(s_rt->slave, addr6, t_params->lane_ctrl);
+		ret = sdw_write_no_pm(s_rt->slave, addr6, t_params->lane_ctrl);
 		if (ret < 0) {
 			dev_err(&s_rt->slave->dev,
 				"DPN_LaneCtrl register write failed for port %d\n",
@@ -319,9 +319,9 @@ static int sdw_enable_disable_slave_ports(struct sdw_bus *bus,
 	 * it is safe to reset this register
 	 */
 	if (en)
-		ret = sdw_write(s_rt->slave, addr, p_rt->ch_mask);
+		ret = sdw_write_no_pm(s_rt->slave, addr, p_rt->ch_mask);
 	else
-		ret = sdw_write(s_rt->slave, addr, 0x0);
+		ret = sdw_write_no_pm(s_rt->slave, addr, 0x0);
 
 	if (ret < 0)
 		dev_err(&s_rt->slave->dev,
@@ -476,9 +476,9 @@ static int sdw_prep_deprep_slave_ports(struct sdw_bus *bus,
 		addr = SDW_DPN_PREPARECTRL(p_rt->num);
 
 		if (prep)
-			ret = sdw_write(s_rt->slave, addr, p_rt->ch_mask);
+			ret = sdw_write_no_pm(s_rt->slave, addr, p_rt->ch_mask);
 		else
-			ret = sdw_write(s_rt->slave, addr, 0x0);
+			ret = sdw_write_no_pm(s_rt->slave, addr, 0x0);
 
 		if (ret < 0) {
 			dev_err(&s_rt->slave->dev,
@@ -491,7 +491,7 @@ static int sdw_prep_deprep_slave_ports(struct sdw_bus *bus,
 		wait_for_completion_timeout(port_ready,
 			msecs_to_jiffies(dpn_prop->ch_prep_timeout));
 
-		val = sdw_read(s_rt->slave, SDW_DPN_PREPARESTATUS(p_rt->num));
+		val = sdw_read_no_pm(s_rt->slave, SDW_DPN_PREPARESTATUS(p_rt->num));
 		if ((val < 0) || (val & p_rt->ch_mask)) {
 			ret = (val < 0) ? val : -ETIMEDOUT;
 			dev_err(&s_rt->slave->dev,
-- 
2.30.2