linux-kernel - [PATCH 1/2] crypto: sun4i-ss: simplify enable/disable of the device

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Date:   Wed, 11 Sep 2019 13:46:49 +0200
From:   Corentin Labbe <clabbe.montjoie@...il.com>
To:     davem@...emloft.net, herbert@...dor.apana.org.au,
        mripard@...nel.org, wens@...e.org
Cc:     linux-arm-kernel@...ts.infradead.org, linux-crypto@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-sunxi@...glegroups.com,
        Corentin Labbe <clabbe.montjoie@...il.com>
Subject: [PATCH 1/2] crypto: sun4i-ss: simplify enable/disable of the device

This patch regroups resource enabling/disabling in dedicated function.
This simplify error handling and will permit to support power
management.

Signed-off-by: Corentin Labbe <clabbe.montjoie@...il.com>
---
 drivers/crypto/sunxi-ss/sun4i-ss-core.c | 73 ++++++++++++++-----------
 1 file changed, 42 insertions(+), 31 deletions(-)

diff --git a/drivers/crypto/sunxi-ss/sun4i-ss-core.c b/drivers/crypto/sunxi-ss/sun4i-ss-core.c
index 9aa6fe081a27..2c9ff01dddfc 100644
--- a/drivers/crypto/sunxi-ss/sun4i-ss-core.c
+++ b/drivers/crypto/sunxi-ss/sun4i-ss-core.c
@@ -223,6 +223,41 @@ static struct sun4i_ss_alg_template ss_algs[] = {
 #endif
 };
 
+static void sun4i_ss_disable(struct sun4i_ss_ctx *ss)
+{
+	if (ss->reset)
+		reset_control_assert(ss->reset);
+	clk_disable_unprepare(ss->ssclk);
+	clk_disable_unprepare(ss->busclk);
+}
+
+static int sun4i_ss_enable(struct sun4i_ss_ctx *ss)
+{
+	int err;
+
+	err = clk_prepare_enable(ss->busclk);
+	if (err) {
+		dev_err(ss->dev, "Cannot prepare_enable busclk\n");
+		goto err_enable;
+	}
+	err = clk_prepare_enable(ss->ssclk);
+	if (err) {
+		dev_err(ss->dev, "Cannot prepare_enable ssclk\n");
+		goto err_enable;
+	}
+	if (ss->reset) {
+		err = reset_control_deassert(ss->reset);
+		if (err) {
+			dev_err(ss->dev, "Cannot deassert reset control\n");
+			goto err_enable;
+		}
+	}
+	return err;
+err_enable:
+	sun4i_ss_disable(ss);
+	return err;
+}
+
 static int sun4i_ss_probe(struct platform_device *pdev)
 {
 	u32 v;
@@ -269,17 +304,9 @@ static int sun4i_ss_probe(struct platform_device *pdev)
 		ss->reset = NULL;
 	}
 
-	/* Enable both clocks */
-	err = clk_prepare_enable(ss->busclk);
-	if (err) {
-		dev_err(&pdev->dev, "Cannot prepare_enable busclk\n");
-		return err;
-	}
-	err = clk_prepare_enable(ss->ssclk);
-	if (err) {
-		dev_err(&pdev->dev, "Cannot prepare_enable ssclk\n");
-		goto error_ssclk;
-	}
+	err = sun4i_ss_enable(ss);
+	if (err)
+		goto error_enable;
 
 	/*
 	 * Check that clock have the correct rates given in the datasheet
@@ -288,16 +315,7 @@ static int sun4i_ss_probe(struct platform_device *pdev)
 	err = clk_set_rate(ss->ssclk, cr_mod);
 	if (err) {
 		dev_err(&pdev->dev, "Cannot set clock rate to ssclk\n");
-		goto error_clk;
-	}
-
-	/* Deassert reset if we have a reset control */
-	if (ss->reset) {
-		err = reset_control_deassert(ss->reset);
-		if (err) {
-			dev_err(&pdev->dev, "Cannot deassert reset control\n");
-			goto error_clk;
-		}
+		goto error_enable;
 	}
 
 	/*
@@ -387,12 +405,8 @@ static int sun4i_ss_probe(struct platform_device *pdev)
 			break;
 		}
 	}
-	if (ss->reset)
-		reset_control_assert(ss->reset);
-error_clk:
-	clk_disable_unprepare(ss->ssclk);
-error_ssclk:
-	clk_disable_unprepare(ss->busclk);
+error_enable:
+	sun4i_ss_disable(ss);
 	return err;
 }
 
@@ -416,10 +430,7 @@ static int sun4i_ss_remove(struct platform_device *pdev)
 	}
 
 	writel(0, ss->base + SS_CTL);
-	if (ss->reset)
-		reset_control_assert(ss->reset);
-	clk_disable_unprepare(ss->busclk);
-	clk_disable_unprepare(ss->ssclk);
+	sun4i_ss_disable(ss);
 	return 0;
 }
 
-- 
2.21.0