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ramips: mt7621: disable highmem support and remove highmem offset patch

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On MT7621 it was observed, that enabling highmem support causes a significant
performance drop, as documented in: https://github.com/openwrt/openwrt/issues/13151
By adjusting the highmem start offset, we avoid leaving any RAM unaddressable,
even on devices with 512 MB

Fixes: https://github.com/openwrt/openwrt/issues/13151
Signed-off-by: Felix Fietkau <nbd@nbd.name>
This commit is contained in:
Felix Fietkau 2023-07-24 13:17:44 +02:00
parent 79fd3e62b4
commit cd2b74e01e
2 changed files with 19 additions and 3 deletions
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3
target/linux/ramips/mt7621/config-5.15
View File

@ -7,7 +7,6 @@ CONFIG_ARCH_SUSPEND_POSSIBLE=y
CONFIG_AT803X_PHY=y
CONFIG_BLK_MQ_PCI=y
CONFIG_BOARD_SCACHE=y
CONFIG_BOUNCE=y
CONFIG_CEVT_R4K=y
CONFIG_CLKSRC_MIPS_GIC=y
CONFIG_CLK_MT7621=y
@ -91,7 +90,6 @@ CONFIG_HARDWARE_WATCHPOINTS=y
CONFIG_HAS_DMA=y
CONFIG_HAS_IOMEM=y
CONFIG_HAS_IOPORT_MAP=y
CONFIG_HIGHMEM=y
CONFIG_I2C=y
CONFIG_I2C_ALGOBIT=y
CONFIG_I2C_BOARDINFO=y
@ -106,7 +104,6 @@ CONFIG_IRQ_DOMAIN_HIERARCHY=y
CONFIG_IRQ_FORCED_THREADING=y
CONFIG_IRQ_MIPS_CPU=y
CONFIG_IRQ_WORK=y
CONFIG_KMAP_LOCAL=y
CONFIG_LED_TRIGGER_PHY=y
CONFIG_LIBFDT=y
CONFIG_LOCK_DEBUGGING_SUPPORT=y

19
target/linux/ramips/patches-5.15/120-highmem-start-offset.patch Normal file
View File

@ -0,0 +1,19 @@
From: Felix Fietkau <nbd@nbd.name>
Date: Mon Jul 24 13:29:13 CEST 2023
Subject: [PATCH] mips: ralink: increase highmem start
Increase highmem start address in order to support devices with 512 MB memory
and MT7621 SoC
Signed-off-by: Felix Fietkau <nbd@nbd.name>
---
--- a/arch/mips/include/asm/mach-ralink/spaces.h
+++ b/arch/mips/include/asm/mach-ralink/spaces.h
@@ -5,6 +5,7 @@
#define PCI_IOBASE _AC(0xa0000000, UL)
#define PCI_IOSIZE SZ_16M
#define IO_SPACE_LIMIT (PCI_IOSIZE - 1)
+#define HIGHMEM_START _AC(0x24000000, UL)
#include <asm/mach-generic/spaces.h>
#endif