diff options
Diffstat (limited to 'meta-openbmc-mods/meta-ast2600/recipes-bsp/u-boot/files/0013-Add-a-workaround-to-cover-UART-interrupt-bug-in-AST2.patch')
| -rw-r--r-- | meta-openbmc-mods/meta-ast2600/recipes-bsp/u-boot/files/0013-Add-a-workaround-to-cover-UART-interrupt-bug-in-AST2.patch | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/meta-openbmc-mods/meta-ast2600/recipes-bsp/u-boot/files/0013-Add-a-workaround-to-cover-UART-interrupt-bug-in-AST2.patch b/meta-openbmc-mods/meta-ast2600/recipes-bsp/u-boot/files/0013-Add-a-workaround-to-cover-UART-interrupt-bug-in-AST2.patch new file mode 100644 index 000000000..04baccf66 --- /dev/null +++ b/meta-openbmc-mods/meta-ast2600/recipes-bsp/u-boot/files/0013-Add-a-workaround-to-cover-UART-interrupt-bug-in-AST2.patch @@ -0,0 +1,58 @@ +From e027384b44aff330375477556eed10c326ad1c48 Mon Sep 17 00:00:00 2001 +From: Jae Hyun Yoo <jae.hyun.yoo@intel.com> +Date: Mon, 27 Apr 2020 12:40:01 -0700 +Subject: [PATCH] Add a workaround to cover UART interrupt bug in AST2600 A0 + +This commit adds a workaround to cover UART interrupt bug in +AST2600 A0 revision. It makes infinite reading on the UART +0x7c +register for clearing abnormal interrupts in every milli-second. + +Signed-off-by: Jae Hyun Yoo <jae.hyun.yoo@intel.com> +--- + board/aspeed/ast2600_intel/intel.c | 22 +++++++++++++++++++--- + 1 file changed, 19 insertions(+), 3 deletions(-) + +diff --git a/board/aspeed/ast2600_intel/intel.c b/board/aspeed/ast2600_intel/intel.c +index b3d2fb313561..0d1ce69b6e53 100644 +--- a/board/aspeed/ast2600_intel/intel.c ++++ b/board/aspeed/ast2600_intel/intel.c +@@ -251,7 +251,19 @@ void enable_onboard_tpm(void) + + static void timer_callback(void *cookie) + { +- debug("+"); ++ uint timer_nr = (uint)cookie; ++ u32 dummy; ++ ++ switch (timer_nr) { ++ case 0: ++ /* WA for UART interrupt bug in A0 */ ++ dummy = readl(0x1e78307c); ++ dummy = readl(0x1e78407c); ++ dummy = readl(0x1e78d07c); ++ dummy = readl(0x1e78e07c); ++ dummy = readl(0x1e78f07c); ++ break; ++ } + } + + int board_early_init_f(void) +@@ -286,9 +298,13 @@ extern void timer_enable(int n, u32 interval_us, interrupt_handler_t *handler, + void *cookie); + int board_late_init(void) + { +-#define ONE_SEC_IN_USEC 1000000 ++#define SCU_014 0x014 /* Silicon Revision ID */ ++#define REV_ID_AST2600A0 0x05000303 /* AST2600 A0 */ ++#define ONE_MSEC_IN_USEC 1000 ++ ++ if (readl(SCU_BASE | SCU_014) == REV_ID_AST2600A0) ++ timer_enable(0, ONE_MSEC_IN_USEC, timer_callback, (void *)0); + +- timer_enable(0, ONE_SEC_IN_USEC, timer_callback, (void *)0); + espi_init(); + + if (read_ffuj()) +-- +2.17.1 + |