diff --git a/target/linux/mediatek/patches-5.4/999-2100-mt7986-trng-add-rng-support.patch b/target/linux/mediatek/patches-5.4/999-2100-mt7986-trng-add-rng-support.patch
new file mode 100644
index 0000000..bef2e1c
--- /dev/null
+++ b/target/linux/mediatek/patches-5.4/999-2100-mt7986-trng-add-rng-support.patch
@@ -0,0 +1,42 @@
+From 28b23dd56546943c99dc4e884576e629b417fb6d Mon Sep 17 00:00:00 2001
+From: Sam Shih <sam.shih@mediatek.com>
+Date: Fri, 2 Jun 2023 13:06:05 +0800
+Subject: [PATCH] [slow-speed-io][999-2100-mt7986-trng-add-rng-support.patch]
+
+---
+ drivers/char/hw_random/mtk-rng.c | 5 +++--
+ 1 file changed, 3 insertions(+), 2 deletions(-)
+
+diff --git a/drivers/char/hw_random/mtk-rng.c b/drivers/char/hw_random/mtk-rng.c
+index 6670516fa..a8bd06da7 100644
+--- a/drivers/char/hw_random/mtk-rng.c
++++ b/drivers/char/hw_random/mtk-rng.c
+@@ -22,7 +22,7 @@
+ #define RNG_AUTOSUSPEND_TIMEOUT		100
+ 
+ #define USEC_POLL			2
+-#define TIMEOUT_POLL			20
++#define TIMEOUT_POLL			60
+ 
+ #define RNG_CTRL			0x00
+ #define RNG_EN				BIT(0)
+@@ -77,7 +77,7 @@ static bool mtk_rng_wait_ready(struct hwrng *rng, bool wait)
+ 		readl_poll_timeout_atomic(priv->base + RNG_CTRL, ready,
+ 					  ready & RNG_READY, USEC_POLL,
+ 					  TIMEOUT_POLL);
+-	return !!ready;
++	return !!(ready & RNG_READY);
+ }
+ 
+ static int mtk_rng_read(struct hwrng *rng, void *buf, size_t max, bool wait)
+@@ -186,6 +186,7 @@ static const struct dev_pm_ops mtk_rng_pm_ops = {
+ #endif	/* CONFIG_PM */
+ 
+ static const struct of_device_id mtk_rng_match[] = {
++	{ .compatible = "mediatek,mt7986-rng" },
+ 	{ .compatible = "mediatek,mt7623-rng" },
+ 	{},
+ };
+-- 
+2.34.1
+