devfreq hack

arch/arm64/boot/dts/freescale/imx8mq-librem5.dtsi

@@ -479,6 +479,9 @@ opp-100M {
 		opp-800M {
 			opp-hz = /bits/ 64 <800000000>;
 		};
+		opp-801M {
+			opp-hz = /bits/ 64 <800000001>;
+		};
 	};
 };
 

arch/arm64/boot/dts/freescale/imx8mq.dtsi

@@ -1252,6 +1252,9 @@ opp-133M {
 				opp-400M {
 					opp-hz = /bits/ 64 <400000000>;
 				};
+				opp-401M {
+					opp-hz = /bits/ 64 <400000001>;
+				};
 				opp-800M {
 					opp-hz = /bits/ 64 <800000000>;
 				};

drivers/devfreq/imx8m-ddrc.c

@@ -244,7 +244,7 @@ static int imx8m_ddrc_target(struct device *dev, unsigned long *freq, u32 flags)
 	dev_pm_opp_put(new_opp);
 
 	old_freq = clk_get_rate(priv->dram_core);
-	if (*freq == old_freq)
+	if (DIV_ROUND_CLOSEST(*freq, 250000) == DIV_ROUND_CLOSEST(old_freq, 250000))
 		return 0;
 
 	freq_info = imx8m_ddrc_find_freq(priv, *freq);
@@ -261,7 +261,7 @@ static int imx8m_ddrc_target(struct device *dev, unsigned long *freq, u32 flags)
 	if (ret)
 		dev_err(dev, "ddrc failed freq switch to %lu from %lu: error %d. now at %lu\n",
 			*freq, old_freq, ret, new_freq);
-	else if (*freq != new_freq)
+	else if (DIV_ROUND_CLOSEST(*freq, 250000) != DIV_ROUND_CLOSEST(new_freq, 250000))
 		dev_err(dev, "ddrc failed freq update to %lu from %lu, now at %lu\n",
 			*freq, old_freq, new_freq);
 	else