linux-kernel - [PATCH 04/12] drivers: soundwire: refactor soundwire pads enable

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Message-ID: <20231221073558.3181911-5-Vijendar.Mukunda@amd.com>
Date: Thu, 21 Dec 2023 13:05:50 +0530
From: Vijendar Mukunda <Vijendar.Mukunda@....com>
To: <broonie@...nel.org>, <vkoul@...nel.org>
CC: <alsa-devel@...a-project.org>, <Basavaraj.Hiregoudar@....com>,
	<Sunil-kumar.Dommati@....com>, <pierre-louis.bossart@...ux.intel.com>,
	<vinod.koul@...el.com>, <venkataprasad.potturu@....com>, Vijendar Mukunda
	<Vijendar.Mukunda@....com>, Bard Liao <yung-chuan.liao@...ux.intel.com>,
	Sanyog Kale <sanyog.r.kale@...el.com>, open list
	<linux-kernel@...r.kernel.org>
Subject: [PATCH 04/12] drivers: soundwire: refactor soundwire pads enable

As sdw pads enable sequence is executed only once, invoke it
from probe sequence.

Program required pads for both manager instances
based on link_mask during probe sequence. This will avoid
acquiring mutex lock.
Remove unnecessary delay after programming ACP_SW_PAD_KEEPER_EN
register.

Signed-off-by: Vijendar Mukunda <Vijendar.Mukunda@....com>
---
 drivers/soundwire/amd_init.c    | 45 +++++++++++++++++++++++++++++++++
 drivers/soundwire/amd_manager.c | 18 -------------
 2 files changed, 45 insertions(+), 18 deletions(-)

diff --git a/drivers/soundwire/amd_init.c b/drivers/soundwire/amd_init.c
index 5c9569d9ad01..b3b3c7266384 100644
--- a/drivers/soundwire/amd_init.c
+++ b/drivers/soundwire/amd_init.c
@@ -15,6 +15,47 @@
 
 #include "amd_init.h"
 
+#define ACP_PAD_PULLDOWN_CTRL				0x0001448
+#define ACP_SW_PAD_KEEPER_EN				0x0001454
+#define AMD_SDW_PAD_PULLDOWN_CTRL_ENABLE_MASK		0x7f9a
+#define AMD_SDW0_PAD_PULLDOWN_CTRL_ENABLE_MASK		0x7f9f
+#define AMD_SDW1_PAD_PULLDOWN_CTRL_ENABLE_MASK		0x7ffa
+#define AMD_SDW0_PAD_EN_MASK				1
+#define AMD_SDW1_PAD_EN_MASK				0x10
+#define AMD_SDW_PAD_EN_MASK	(AMD_SDW0_PAD_EN_MASK | AMD_SDW1_PAD_EN_MASK)
+
+static int amd_enable_sdw_pads(void __iomem *mmio, u32 link_mask, struct device *dev)
+{
+	u32 val;
+	u32 pad_keeper_en_mask, pad_pulldown_ctrl_mask;
+
+	switch (link_mask) {
+	case 1:
+		pad_keeper_en_mask = AMD_SDW0_PAD_EN_MASK;
+		pad_pulldown_ctrl_mask = AMD_SDW0_PAD_PULLDOWN_CTRL_ENABLE_MASK;
+		break;
+	case 2:
+		pad_keeper_en_mask = AMD_SDW1_PAD_EN_MASK;
+		pad_pulldown_ctrl_mask = AMD_SDW1_PAD_PULLDOWN_CTRL_ENABLE_MASK;
+		break;
+	case 3:
+		pad_keeper_en_mask = AMD_SDW_PAD_EN_MASK;
+		pad_pulldown_ctrl_mask = AMD_SDW_PAD_PULLDOWN_CTRL_ENABLE_MASK;
+		break;
+	default:
+		dev_err(dev, "No SDW Links are enabled\n");
+		return -ENODEV;
+	}
+
+	val = readl(mmio + ACP_SW_PAD_KEEPER_EN);
+	val |= pad_keeper_en_mask;
+	writel(val, mmio + ACP_SW_PAD_KEEPER_EN);
+	val = readl(mmio + ACP_PAD_PULLDOWN_CTRL);
+	val &= pad_pulldown_ctrl_mask;
+	writel(val, mmio + ACP_PAD_PULLDOWN_CTRL);
+	return 0;
+}
+
 static int sdw_amd_cleanup(struct sdw_amd_ctx *ctx)
 {
 	int i;
@@ -37,6 +78,7 @@ static struct sdw_amd_ctx *sdw_amd_probe_controller(struct sdw_amd_res *res)
 	struct platform_device_info pdevinfo[2];
 	u32 link_mask;
 	int count, index;
+	int ret;
 
 	if (!res)
 		return NULL;
@@ -50,6 +92,9 @@ static struct sdw_amd_ctx *sdw_amd_probe_controller(struct sdw_amd_res *res)
 
 	count = res->count;
 	dev_dbg(&adev->dev, "Creating %d SDW Link devices\n", count);
+	ret = amd_enable_sdw_pads(res->mmio_base, res->link_mask, res->parent);
+	if (ret)
+		return NULL;
 
 	/*
 	 * we need to alloc/free memory manually and can't use devm:
diff --git a/drivers/soundwire/amd_manager.c b/drivers/soundwire/amd_manager.c
index c27b0b0f33a6..1427cccfc309 100644
--- a/drivers/soundwire/amd_manager.c
+++ b/drivers/soundwire/amd_manager.c
@@ -26,23 +26,6 @@
 
 #define to_amd_sdw(b)	container_of(b, struct amd_sdw_manager, bus)
 
-static void amd_enable_sdw_pads(struct amd_sdw_manager *amd_manager)
-{
-	u32 sw_pad_pulldown_val;
-	u32 val;
-
-	mutex_lock(amd_manager->acp_sdw_lock);
-	val = readl(amd_manager->acp_mmio + ACP_SW_PAD_KEEPER_EN);
-	val |= amd_manager->reg_mask->sw_pad_enable_mask;
-	writel(val, amd_manager->acp_mmio + ACP_SW_PAD_KEEPER_EN);
-	usleep_range(1000, 1500);
-
-	sw_pad_pulldown_val = readl(amd_manager->acp_mmio + ACP_PAD_PULLDOWN_CTRL);
-	sw_pad_pulldown_val &= amd_manager->reg_mask->sw_pad_pulldown_mask;
-	writel(sw_pad_pulldown_val, amd_manager->acp_mmio + ACP_PAD_PULLDOWN_CTRL);
-	mutex_unlock(amd_manager->acp_sdw_lock);
-}
-
 static int amd_init_sdw_manager(struct amd_sdw_manager *amd_manager)
 {
 	u32 val;
@@ -872,7 +855,6 @@ int amd_sdw_manager_start(struct amd_sdw_manager *amd_manager)
 
 	prop = &amd_manager->bus.prop;
 	if (!prop->hw_disabled) {
-		amd_enable_sdw_pads(amd_manager);
 		ret = amd_init_sdw_manager(amd_manager);
 		if (ret)
 			return ret;
-- 
2.34.1