From a5f50e0114f9fd39c16e416aad2aa292aaaaacd6 Mon Sep 17 00:00:00 2001 From: Stefan Roese Date: Tue, 18 Dec 2018 10:27:14 +0100 Subject: [PATCH] mips: mt76xx: Flush d-cache in arch_misc_init() to solve d-cache issues It has been noticed, that sometimes the d-cache is not in a "clean-state" when U-Boot is running on MT7688. This was detected when using the ethernet driver (which uses d-cache) and a TFTP command does not complete. Flushing the complete d-cache (again?) here seems to fix this issue. Signed-off-by: Stefan Roese Cc: Daniel Schwierzeck --- arch/mips/Kconfig | 2 +- arch/mips/mach-mt7620/cpu.c | 14 +++++++++++++- 2 files changed, 14 insertions(+), 2 deletions(-) diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig index 1b1b1d7..355d3b4 100644 --- a/arch/mips/Kconfig +++ b/arch/mips/Kconfig @@ -79,7 +79,7 @@ config ARCH_MT7620 select DM_SERIAL imply DM_SPI imply DM_SPI_FLASH - select ARCH_MISC_INIT if WATCHDOG + select ARCH_MISC_INIT select MIPS_TUNE_24KC select OF_CONTROL select ROM_EXCEPTION_VECTORS diff --git a/arch/mips/mach-mt7620/cpu.c b/arch/mips/mach-mt7620/cpu.c index 87cc973..9e0ca71 100644 --- a/arch/mips/mach-mt7620/cpu.c +++ b/arch/mips/mach-mt7620/cpu.c @@ -89,9 +89,21 @@ void watchdog_reset(void) wdt_reset(watchdog_dev); } } +#endif int arch_misc_init(void) { + /* + * It has been noticed, that sometimes the d-cache is not in a + * "clean-state" when U-Boot is running on MT7688. This was + * detected when using the ethernet driver (which uses d-cache) + * and a TFTP command does not complete. Flushing the complete + * d-cache (again?) here seems to fix this issue. + */ + flush_dcache_range(gd->bd->bi_memstart, + gd->bd->bi_memstart + gd->ram_size - 1); + +#ifdef CONFIG_WATCHDOG /* Init watchdog */ if (uclass_get_device_by_seq(UCLASS_WDT, 0, &watchdog_dev)) { debug("Watchdog: Not found by seq!\n"); @@ -103,7 +115,7 @@ int arch_misc_init(void) wdt_start(watchdog_dev, 60000, 0); /* 60 seconds */ printf("Watchdog: Started\n"); +#endif return 0; } -#endif -- 2.7.4