linux-kernel - [RFC PATCH 36/40] soundwire: intel: disable interrupts on suspend

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Date:   Thu, 25 Jul 2019 18:40:28 -0500
From:   Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
To:     alsa-devel@...a-project.org
Cc:     linux-kernel@...r.kernel.org, tiwai@...e.de, broonie@...nel.org,
        vkoul@...nel.org, gregkh@...uxfoundation.org, jank@...ence.com,
        srinivas.kandagatla@...aro.org, slawomir.blauciak@...el.com,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        Sanyog Kale <sanyog.r.kale@...el.com>
Subject: [RFC PATCH 36/40] soundwire: intel: disable interrupts on suspend

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
---
 drivers/soundwire/cadence_master.c | 42 +++++++++++++++++-------------
 drivers/soundwire/cadence_master.h |  2 +-
 drivers/soundwire/intel.c          |  6 +++--
 3 files changed, 29 insertions(+), 21 deletions(-)

diff --git a/drivers/soundwire/cadence_master.c b/drivers/soundwire/cadence_master.c
index f486fe15fb46..fa7230b0f200 100644
--- a/drivers/soundwire/cadence_master.c
+++ b/drivers/soundwire/cadence_master.c
@@ -814,33 +814,39 @@ EXPORT_SYMBOL(sdw_cdns_exit_reset);
  * sdw_cdns_enable_interrupt() - Enable SDW interrupts and update config
  * @cdns: Cadence instance
  */
-int sdw_cdns_enable_interrupt(struct sdw_cdns *cdns)
+int sdw_cdns_enable_interrupt(struct sdw_cdns *cdns, bool state)
 {
 	u32 mask;
 
-	cdns_writel(cdns, CDNS_MCP_SLAVE_INTMASK0,
-		    CDNS_MCP_SLAVE_INTMASK0_MASK);
-	cdns_writel(cdns, CDNS_MCP_SLAVE_INTMASK1,
-		    CDNS_MCP_SLAVE_INTMASK1_MASK);
+	if (state) {
+		cdns_writel(cdns, CDNS_MCP_SLAVE_INTMASK0,
+			    CDNS_MCP_SLAVE_INTMASK0_MASK);
+		cdns_writel(cdns, CDNS_MCP_SLAVE_INTMASK1,
+			    CDNS_MCP_SLAVE_INTMASK1_MASK);
 
-	/* enable detection of slave state changes */
-	mask = CDNS_MCP_INT_SLAVE_RSVD | CDNS_MCP_INT_SLAVE_ALERT |
-		CDNS_MCP_INT_SLAVE_ATTACH | CDNS_MCP_INT_SLAVE_NATTACH;
+		/* enable detection of slave state changes */
+		mask = CDNS_MCP_INT_SLAVE_RSVD | CDNS_MCP_INT_SLAVE_ALERT |
+			CDNS_MCP_INT_SLAVE_ATTACH | CDNS_MCP_INT_SLAVE_NATTACH;
 
-	/* enable detection of bus issues */
-	mask |= CDNS_MCP_INT_CTRL_CLASH | CDNS_MCP_INT_DATA_CLASH |
-		CDNS_MCP_INT_PARITY;
+		/* enable detection of bus issues */
+		mask |= CDNS_MCP_INT_CTRL_CLASH | CDNS_MCP_INT_DATA_CLASH |
+			CDNS_MCP_INT_PARITY;
 
-	/* no detection of port interrupts for now */
+		/* no detection of port interrupts for now */
 
-	/* enable detection of RX fifo level */
-	mask |= CDNS_MCP_INT_RX_WL;
+		/* enable detection of RX fifo level */
+		mask |= CDNS_MCP_INT_RX_WL;
 
-	/* now enable all of the above */
-	mask |= CDNS_MCP_INT_IRQ;
+		/* now enable all of the above */
+		mask |= CDNS_MCP_INT_IRQ;
 
-	if (interrupt_mask) /* parameter override */
-		mask = interrupt_mask;
+		if (interrupt_mask) /* parameter override */
+			mask = interrupt_mask;
+	} else {
+		cdns_writel(cdns, CDNS_MCP_SLAVE_INTMASK0, 0);
+		cdns_writel(cdns, CDNS_MCP_SLAVE_INTMASK1, 0);
+		mask = 0;
+	}
 
 	cdns_writel(cdns, CDNS_MCP_INTMASK, mask);
 
diff --git a/drivers/soundwire/cadence_master.h b/drivers/soundwire/cadence_master.h
index 2b551f9226f3..1a0ba36dd78f 100644
--- a/drivers/soundwire/cadence_master.h
+++ b/drivers/soundwire/cadence_master.h
@@ -162,7 +162,7 @@ int sdw_cdns_init(struct sdw_cdns *cdns);
 int sdw_cdns_pdi_init(struct sdw_cdns *cdns,
 		      struct sdw_cdns_stream_config config);
 int sdw_cdns_exit_reset(struct sdw_cdns *cdns);
-int sdw_cdns_enable_interrupt(struct sdw_cdns *cdns);
+int sdw_cdns_enable_interrupt(struct sdw_cdns *cdns, bool state);
 
 void sdw_cdns_debugfs_init(struct sdw_cdns *cdns, struct dentry *root);
 
diff --git a/drivers/soundwire/intel.c b/drivers/soundwire/intel.c
index 9ebe38e4d979..1192d5775484 100644
--- a/drivers/soundwire/intel.c
+++ b/drivers/soundwire/intel.c
@@ -1110,7 +1110,7 @@ static int intel_probe(struct platform_device *pdev)
 		goto err_init;
 	}
 
-	ret = sdw_cdns_enable_interrupt(&sdw->cdns);
+	ret = sdw_cdns_enable_interrupt(&sdw->cdns, true);
 
 	ret = sdw_cdns_exit_reset(&sdw->cdns);
 
@@ -1169,6 +1169,8 @@ static int intel_suspend(struct device *dev)
 		return 0;
 	}
 
+	sdw_cdns_enable_interrupt(&sdw->cdns, false);
+
 	ret = intel_link_power_down(sdw);
 	if (ret) {
 		dev_err(dev, "Link power down failed: %d", ret);
@@ -1199,7 +1201,7 @@ static int intel_resume(struct device *dev)
 		return ret;
 	}
 
-	sdw_cdns_enable_interrupt(&sdw->cdns);
+	sdw_cdns_enable_interrupt(&sdw->cdns, true);
 
 	ret = sdw_cdns_exit_reset(&sdw->cdns);
 
-- 
2.20.1