linux-kernel - [PATCH 13/20] soundwire: intel

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Message-Id: <20230323054452.1543233-14-yung-chuan.liao@linux.intel.com>
Date:   Thu, 23 Mar 2023 13:44:45 +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 13/20] soundwire: intel_ace2x: configure link PHY

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

Unlike previous hardware generations, the glue-to-master transition is
not managed by software, instead the transitions are managed as part
of the power-up/down sequences controlled by SPA/CPA bits.

The only thing that's required is to configure the link PHY for
'normal' operation instead of the PHY test mode.

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 | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/drivers/soundwire/intel_ace2x.c b/drivers/soundwire/intel_ace2x.c
index 01668246b7ba..5deff32976f1 100644
--- a/drivers/soundwire/intel_ace2x.c
+++ b/drivers/soundwire/intel_ace2x.c
@@ -15,6 +15,22 @@
 #include "bus.h"
 #include "intel.h"
 
+/*
+ * shim vendor-specific (vs) ops
+ */
+
+static void intel_shim_vs_init(struct sdw_intel *sdw)
+{
+	void __iomem *shim_vs = sdw->link_res->shim_vs;
+	u16 act = 0;
+
+	u16p_replace_bits(&act, 0x1, SDW_SHIM2_INTEL_VS_ACTMCTL_DOAIS);
+	act |= SDW_SHIM2_INTEL_VS_ACTMCTL_DACTQE;
+	act |=  SDW_SHIM2_INTEL_VS_ACTMCTL_DODS;
+	intel_writew(shim_vs, SDW_SHIM2_INTEL_VS_ACTMCTL, act);
+	usleep_range(10, 15);
+}
+
 static int intel_link_power_up(struct sdw_intel *sdw)
 {
 	struct sdw_bus *bus = &sdw->cdns.bus;
@@ -63,6 +79,9 @@ static int intel_link_power_up(struct sdw_intel *sdw)
 	*shim_mask |= BIT(link_id);
 
 	sdw->cdns.link_up = true;
+
+	intel_shim_vs_init(sdw);
+
 out:
 	mutex_unlock(sdw->link_res->shim_lock);
 
-- 
2.25.1