diff options
Diffstat (limited to 'meta-openbmc-mods/meta-common/recipes-kernel/linux/linux-aspeed/0105-i2c-aspeed-fix-arbitration-loss-handling-logic.patch')
| -rw-r--r-- | meta-openbmc-mods/meta-common/recipes-kernel/linux/linux-aspeed/0105-i2c-aspeed-fix-arbitration-loss-handling-logic.patch | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/meta-openbmc-mods/meta-common/recipes-kernel/linux/linux-aspeed/0105-i2c-aspeed-fix-arbitration-loss-handling-logic.patch b/meta-openbmc-mods/meta-common/recipes-kernel/linux/linux-aspeed/0105-i2c-aspeed-fix-arbitration-loss-handling-logic.patch new file mode 100644 index 000000000..f5c0a6ec8 --- /dev/null +++ b/meta-openbmc-mods/meta-common/recipes-kernel/linux/linux-aspeed/0105-i2c-aspeed-fix-arbitration-loss-handling-logic.patch @@ -0,0 +1,38 @@ +From 2cf0bee18a390a90cd1e5736ba79909a8feef94e Mon Sep 17 00:00:00 2001 +From: Jae Hyun Yoo <jae.hyun.yoo@intel.com> +Date: Tue, 28 Apr 2020 12:08:14 -0700 +Subject: [PATCH] i2c: aspeed: fix arbitration loss handling logic + +When an arbitration loss happens in a multi-master bus, driver +drops the packet induce I2C subsystem to retry the transaction +by returning -EAGAIN. During this handling, tx_ack comes along +sometimes and it causes this this garbage printing +out: + +aspeed-i2c-bus 1e78a400.i2c-bus: irq handled != irq. expected 0x00000009, but was 0x00000008 + +To fix this issue, this commit adds the tx_ack flag clearing into +the arbitration loss handling logic. + +Signed-off-by: Jae Hyun Yoo <jae.hyun.yoo@intel.com> +--- + drivers/i2c/busses/i2c-aspeed.c | 3 +++ + 1 file changed, 3 insertions(+) + +diff --git a/drivers/i2c/busses/i2c-aspeed.c b/drivers/i2c/busses/i2c-aspeed.c +index b56e60508914..8625c0da440b 100644 +--- a/drivers/i2c/busses/i2c-aspeed.c ++++ b/drivers/i2c/busses/i2c-aspeed.c +@@ -896,6 +896,9 @@ static u32 aspeed_i2c_master_irq(struct aspeed_i2c_bus *bus, u32 irq_status) + if (bus->master_state != ASPEED_I2C_MASTER_INACTIVE) { + bus->cmd_err = ret; + bus->master_state = ASPEED_I2C_MASTER_INACTIVE; ++ if (ret == -EAGAIN) ++ irq_handled |= (irq_status & ++ ASPEED_I2CD_INTR_TX_ACK); + goto out_complete; + } + } +-- +2.7.4 + |