1 files changed, 62 insertions, 0 deletions

diff --git a/drivers/crypto/stm32/stm32_crc32.c b/drivers/crypto/stm32/stm32_crc32.c
index 8f09b8430893..04ba5e1399e5 100644
--- a/drivers/crypto/stm32/stm32_crc32.c
+++ b/drivers/crypto/stm32/stm32_crc32.c
@@ -8,6 +8,7 @@
 #include <linux/clk.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
 
 #include <crypto/internal/hash.h>
 
@@ -32,6 +33,8 @@
 #define POLY_CRC32              0xEDB88320
 #define POLY_CRC32C             0x82F63B78
 
+#define CRC_AUTOSUSPEND_DELAY   50
+
 struct stm32_crc {
         struct list_head list;
         struct device    *dev;
@@ -106,6 +109,8 @@ static int stm32_crc_init(struct shash_desc *desc)
         }
         spin_unlock_bh(&crc_list.lock);
 
+        pm_runtime_get_sync(ctx->crc->dev);
+
         /* Reset, set key, poly and configure in bit reverse mode */
         writel_relaxed(bitrev32(mctx->key), ctx->crc->regs + CRC_INIT);
         writel_relaxed(bitrev32(mctx->poly), ctx->crc->regs + CRC_POL);
@@ -115,6 +120,9 @@ static int stm32_crc_init(struct shash_desc *desc)
         ctx->partial = readl_relaxed(ctx->crc->regs + CRC_DR);
         ctx->crc->nb_pending_bytes = 0;
 
+        pm_runtime_mark_last_busy(ctx->crc->dev);
+        pm_runtime_put_autosuspend(ctx->crc->dev);
+
         return 0;
 }
 
@@ -126,6 +134,8 @@ static int stm32_crc_update(struct shash_desc *desc, const u8 *d8,
         u32 *d32;
         unsigned int i;
 
+        pm_runtime_get_sync(crc->dev);
+
         if (unlikely(crc->nb_pending_bytes)) {
                 while (crc->nb_pending_bytes != sizeof(u32) && length) {
                         /* Fill in pending data */
@@ -149,6 +159,9 @@ static int stm32_crc_update(struct shash_desc *desc, const u8 *d8,
         /* Store partial result */
         ctx->partial = readl_relaxed(crc->regs + CRC_DR);
 
+        pm_runtime_mark_last_busy(crc->dev);
+        pm_runtime_put_autosuspend(crc->dev);
+
         /* Check for pending data (non 32 bits) */
         length &= 3;
         if (likely(!length))
@@ -272,6 +285,13 @@ static int stm32_crc_probe(struct platform_device *pdev)
                 return ret;
         }
 
+        pm_runtime_set_autosuspend_delay(dev, CRC_AUTOSUSPEND_DELAY);
+        pm_runtime_use_autosuspend(dev);
+
+        pm_runtime_get_noresume(dev);
+        pm_runtime_set_active(dev);
+        pm_runtime_enable(dev);
+
         platform_set_drvdata(pdev, crc);
 
         spin_lock(&crc_list.lock);
@@ -287,12 +307,18 @@ static int stm32_crc_probe(struct platform_device *pdev)
 
         dev_info(dev, "Initialized\n");
 
+        pm_runtime_put_sync(dev);
+
         return 0;
 }
 
 static int stm32_crc_remove(struct platform_device *pdev)
 {
         struct stm32_crc *crc = platform_get_drvdata(pdev);
+        int ret = pm_runtime_get_sync(crc->dev);
+
+        if (ret < 0)
+                return ret;
 
         spin_lock(&crc_list.lock);
         list_del(&crc->list);
@@ -300,11 +326,46 @@ static int stm32_crc_remove(struct platform_device *pdev)
 
         crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
 
+        pm_runtime_disable(crc->dev);
+        pm_runtime_put_noidle(crc->dev);
+
         clk_disable_unprepare(crc->clk);
 
         return 0;
 }
 
+#ifdef CONFIG_PM
+static int stm32_crc_runtime_suspend(struct device *dev)
+{
+        struct stm32_crc *crc = dev_get_drvdata(dev);
+
+        clk_disable_unprepare(crc->clk);
+
+        return 0;
+}
+
+static int stm32_crc_runtime_resume(struct device *dev)
+{
+        struct stm32_crc *crc = dev_get_drvdata(dev);
+        int ret;
+
+        ret = clk_prepare_enable(crc->clk);
+        if (ret) {
+                dev_err(crc->dev, "Failed to prepare_enable clock\n");
+                return ret;
+        }
+
+        return 0;
+}
+#endif
+
+static const struct dev_pm_ops stm32_crc_pm_ops = {
+        SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
+                                pm_runtime_force_resume)
+        SET_RUNTIME_PM_OPS(stm32_crc_runtime_suspend,
+                           stm32_crc_runtime_resume, NULL)
+};
+
 static const struct of_device_id stm32_dt_ids[] = {
         { .compatible = "st,stm32f7-crc", },
         {},
@@ -316,6 +377,7 @@ static struct platform_driver stm32_crc_driver = {
         .remove = stm32_crc_remove,
         .driver = {
                 .name           = DRIVER_NAME,
+                .pm             = &stm32_crc_pm_ops,
                 .of_match_table = stm32_dt_ids,
         },
 };