mediatek: use cpufreq fix suggested by MediaTek

Use suggested fix for mediatek-cpufreq, patch will also be sent
upstream.

Signed-off-by: Daniel Golle <[email protected]>

target/linux/mediatek/patches-5.15/351-cpufreq-mediatek-correct-voltages-for-MT7622-and-MT7.patch

@@ -0,0 +1,53 @@
+From e7697814c142c99f470c3458d49e41b25a575f23 Mon Sep 17 00:00:00 2001
+From: Daniel Golle <[email protected]>
+Date: Fri, 26 May 2023 10:31:40 +0100
+Subject: [PATCH] cpufreq: mediatek: correct voltages for MT7622 and MT7623
+
+The MT6380 regulator typically used together with MT7622 does not
+support the current maximum processor and SRAM voltage in the cpufreq
+driver (1360000uV).
+For MT7622 limit processor and SRAM supply voltages to 1350000uV to
+avoid having the tracking algorithm request unsupported voltages from
+the regulator.
+
+On MT7623 there is no separate SRAM supply and the maximum voltage used
+is 1300000uV. Create dedicated platform data for MT7623 to cover that
+case as well.
+
+Fixes: 0883426fd07e3 ("cpufreq: mediatek: Raise proc and sram max voltage for MT7622/7623")
+Suggested-by: Jia-wei Chang <[email protected]>
+Signed-off-by: Daniel Golle <[email protected]>
+---
+ drivers/cpufreq/mediatek-cpufreq.c | 13 ++++++++++---
+ 1 file changed, 10 insertions(+), 3 deletions(-)
+
+--- a/drivers/cpufreq/mediatek-cpufreq.c
++++ b/drivers/cpufreq/mediatek-cpufreq.c
+@@ -696,9 +696,16 @@ static const struct mtk_cpufreq_platform
+ static const struct mtk_cpufreq_platform_data mt7622_platform_data = {
+ 	.min_volt_shift = 100000,
+ 	.max_volt_shift = 200000,
+-	.proc_max_volt = 1360000,
++	.proc_max_volt = 1350000,
+ 	.sram_min_volt = 0,
+-	.sram_max_volt = 1360000,
++	.sram_max_volt = 1350000,
++	.ccifreq_supported = false,
++};
++
++static const struct mtk_cpufreq_platform_data mt7623_platform_data = {
++	.min_volt_shift = 100000,
++	.max_volt_shift = 200000,
++	.proc_max_volt = 1300000,
+ 	.ccifreq_supported = false,
+ };
+
+@@ -743,7 +750,7 @@ static const struct of_device_id mtk_cpu
+ 	{ .compatible = "mediatek,mt2701", .data = &mt2701_platform_data },
+ 	{ .compatible = "mediatek,mt2712", .data = &mt2701_platform_data },
+ 	{ .compatible = "mediatek,mt7622", .data = &mt7622_platform_data },
+-	{ .compatible = "mediatek,mt7623", .data = &mt7622_platform_data },
++	{ .compatible = "mediatek,mt7623", .data = &mt7623_platform_data },
+ 	{ .compatible = "mediatek,mt7988", .data = &mt7988_platform_data },
+ 	{ .compatible = "mediatek,mt8167", .data = &mt8516_platform_data },
+ 	{ .compatible = "mediatek,mt817x", .data = &mt2701_platform_data },