hwrng: mxc-rnga - fix data_present API

Commit 45001e9, which added support for RNGA, ignored the previous commit
984e976, which changed the data_present API.

Cc: Matt Mackall <mpm@selenic.com>
Cc: Sascha Hauer <kernel@pengutronix.de>
Cc: Alan Carvalho de Assis <acassis@gmail.com>
Cc: <linux-arm-kernel@lists.infradead.org>
Signed-off-by: Benoît Thébaudeau <benoit.thebaudeau@advansee.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 13 insertions, 8 deletions

diff --git a/drivers/char/hw_random/mxc-rnga.c b/drivers/char/hw_random/mxc-rnga.c
index 187c6be80f43..85074de5042e 100644
--- a/drivers/char/hw_random/mxc-rnga.c
+++ b/drivers/char/hw_random/mxc-rnga.c
@@ -24,6 +24,7 @@
 #include <linux/ioport.h>
 #include <linux/platform_device.h>
 #include <linux/hw_random.h>
+#include <linux/delay.h>
 #include <linux/io.h>
 
 /* RNGA Registers */
@@ -60,16 +61,20 @@
 
 static struct platform_device *rng_dev;
 
-static int mxc_rnga_data_present(struct hwrng *rng)
+static int mxc_rnga_data_present(struct hwrng *rng, int wait)
 {
-        int level;
         void __iomem *rng_base = (void __iomem *)rng->priv;
-
-        /* how many random numbers is in FIFO? [0-16] */
-        level = ((__raw_readl(rng_base + RNGA_STATUS) &
-                        RNGA_STATUS_LEVEL_MASK) >> 8);
-
-        return level > 0 ? 1 : 0;
+        int i;
+
+        for (i = 0; i < 20; i++) {
+                /* how many random numbers are in FIFO? [0-16] */
+                int level = (__raw_readl(rng_base + RNGA_STATUS) &
+                                RNGA_STATUS_LEVEL_MASK) >> 8;
+                if (level || !wait)
+                        return !!level;
+                udelay(10);
+        }
+        return 0;
 }
 
 static int mxc_rnga_data_read(struct hwrng *rng, u32 * data)