linux-kernel - [PATCH 17/20] soundwire: intel

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Message-Id: <20230323054452.1543233-18-yung-chuan.liao@linux.intel.com>
Date:   Thu, 23 Mar 2023 13:44:49 +0800
From:   Bard Liao <yung-chuan.liao@...ux.intel.com>
To:     alsa-devel@...a-project.org, vkoul@...nel.org, broonie@...nel.org
Cc:     vinod.koul@...aro.org, linux-kernel@...r.kernel.org,
        pierre-louis.bossart@...ux.intel.com, bard.liao@...el.com,
        tiwai@...e.de
Subject: [PATCH 17/20] soundwire: intel_ace2x: enable wake support

From: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>

The WAKEEN and WAKESTS registers were moved to the per-link SHIM_VS
area.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
Reviewed-by: Rander Wang <rander.wang@...el.com>
Reviewed-by: Péter Ujfalusi <peter.ujfalusi@...ux.intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@...ux.intel.com>
Signed-off-by: Bard Liao <yung-chuan.liao@...ux.intel.com>
---
 drivers/soundwire/intel_ace2x.c | 38 +++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)

diff --git a/drivers/soundwire/intel_ace2x.c b/drivers/soundwire/intel_ace2x.c
index 2e33e8a00b55..fe950b3ea3bc 100644
--- a/drivers/soundwire/intel_ace2x.c
+++ b/drivers/soundwire/intel_ace2x.c
@@ -31,6 +31,41 @@ static void intel_shim_vs_init(struct sdw_intel *sdw)
 	usleep_range(10, 15);
 }
 
+static int intel_shim_check_wake(struct sdw_intel *sdw)
+{
+	void __iomem *shim_vs;
+	u16 wake_sts;
+
+	shim_vs = sdw->link_res->shim_vs;
+	wake_sts = intel_readw(shim_vs, SDW_SHIM2_INTEL_VS_WAKESTS);
+
+	return wake_sts & SDW_SHIM2_INTEL_VS_WAKEEN_PWS;
+}
+
+static void intel_shim_wake(struct sdw_intel *sdw, bool wake_enable)
+{
+	void __iomem *shim_vs = sdw->link_res->shim_vs;
+	u16 wake_en;
+	u16 wake_sts;
+
+	wake_en = intel_readw(shim_vs, SDW_SHIM2_INTEL_VS_WAKEEN);
+
+	if (wake_enable) {
+		/* Enable the wakeup */
+		wake_en |= SDW_SHIM2_INTEL_VS_WAKEEN_PWE;
+		intel_writew(shim_vs, SDW_SHIM2_INTEL_VS_WAKEEN, wake_en);
+	} else {
+		/* Disable the wake up interrupt */
+		wake_en &= ~SDW_SHIM2_INTEL_VS_WAKEEN_PWE;
+		intel_writew(shim_vs, SDW_SHIM2_INTEL_VS_WAKEEN, wake_en);
+
+		/* Clear wake status (W1C) */
+		wake_sts = intel_readw(shim_vs, SDW_SHIM2_INTEL_VS_WAKESTS);
+		wake_sts |= SDW_SHIM2_INTEL_VS_WAKEEN_PWS;
+		intel_writew(shim_vs, SDW_SHIM2_INTEL_VS_WAKESTS, wake_sts);
+	}
+}
+
 static int intel_link_power_up(struct sdw_intel *sdw)
 {
 	struct sdw_bus *bus = &sdw->cdns.bus;
@@ -325,6 +360,9 @@ const struct sdw_intel_hw_ops sdw_intel_lnl_hw_ops = {
 	.link_power_up = intel_link_power_up,
 	.link_power_down = intel_link_power_down,
 
+	.shim_check_wake = intel_shim_check_wake,
+	.shim_wake = intel_shim_wake,
+
 	.sync_arm = intel_sync_arm,
 	.sync_go_unlocked = intel_sync_go_unlocked,
 	.sync_go = intel_sync_go,
-- 
2.25.1