diff --git a/drivers/clk/renesas/renesas-cpg-mssr.c b/drivers/clk/renesas/renesas-cpg-mssr.c
index cb80d1bf6c7c..55ac571c7388 100644
--- a/drivers/clk/renesas/renesas-cpg-mssr.c
+++ b/drivers/clk/renesas/renesas-cpg-mssr.c
@@ -612,8 +612,15 @@ static int cpg_mssr_reset(struct reset_controller_dev *rcdev,
 	/* Reset module */
 	writel(bitmask, priv->base + priv->reset_regs[reg]);
 
-	/* Wait for at least one cycle of the RCLK clock (@ ca. 32 kHz) */
-	udelay(35);
+	/*
+	 * On R-Car Gen4, delay after SRCR has been written is 1ms.
+	 * On older SoCs, delay after SRCR has been written is 35us
+	 * (one cycle of the RCLK clock @ ca. 32 kHz).
+	 */
+	if (priv->reg_layout == CLK_REG_LAYOUT_RCAR_GEN4)
+		usleep_range(1000, 2000);
+	else
+		usleep_range(35, 1000);
 
 	/* Release module from reset state */
 	writel(bitmask, priv->base + priv->reset_clear_regs[reg]);