linux-kernel - [PATCH 7/7] soundwire: intel

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Date: Tue, 26 Mar 2024 09:20:30 +0000
From: Bard Liao <yung-chuan.liao@...ux.intel.com>
To: linux-sound@...r.kernel.org,
	vkoul@...nel.org
Cc: vinod.koul@...aro.org,
	linux-kernel@...r.kernel.org,
	pierre-louis.bossart@...ux.intel.com,
	bard.liao@...el.com
Subject: [PATCH 7/7] soundwire: intel_ace2x: set the clock source

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

Insert clock setup after power-up and before setting up the SYNCPRD,
per hardware recommendations.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
Reviewed-by: Rander Wang <rander.wang@...el.com>
Signed-off-by: Bard Liao <yung-chuan.liao@...ux.intel.com>
---
 drivers/soundwire/intel_ace2x.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/drivers/soundwire/intel_ace2x.c b/drivers/soundwire/intel_ace2x.c
index d8ae05cf3d57..43a348db83bf 100644
--- a/drivers/soundwire/intel_ace2x.c
+++ b/drivers/soundwire/intel_ace2x.c
@@ -33,6 +33,20 @@ static void intel_shim_vs_init(struct sdw_intel *sdw)
 	usleep_range(10, 15);
 }
 
+static void intel_shim_vs_set_clock_source(struct sdw_intel *sdw, u32 source)
+{
+	void __iomem *shim_vs = sdw->link_res->shim_vs;
+	u32 val;
+
+	val = intel_readl(shim_vs, SDW_SHIM2_INTEL_VS_LVSCTL);
+
+	u32p_replace_bits(&val, source, SDW_SHIM2_INTEL_VS_LVSCTL_MLCS);
+
+	intel_writel(shim_vs, SDW_SHIM2_INTEL_VS_LVSCTL, val);
+
+	dev_dbg(sdw->cdns.dev, "clock source %d LVSCTL %#x\n", source, val);
+}
+
 static int intel_shim_check_wake(struct sdw_intel *sdw)
 {
 	void __iomem *shim_vs;
@@ -100,6 +114,8 @@ static int intel_link_power_up(struct sdw_intel *sdw)
 		goto out;
 	}
 
+	intel_shim_vs_set_clock_source(sdw, clock_source);
+
 	if (!*shim_mask) {
 		/* we first need to program the SyncPRD/CPU registers */
 		dev_dbg(sdw->cdns.dev, "first link up, programming SYNCPRD\n");
-- 
2.34.1