soundwire: intel_ace2x: set the clock source

Insert clock setup after power-up and before setting up the SYNCPRD,
per hardware recommendations.
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Rander Wang <rander.wang@intel.com>
Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Link: https://lore.kernel.org/r/20240326092030.1062802-8-yung-chuan.liao@linux.intel.comSigned-off-by: Vinod Koul <vkoul@kernel.org>

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");