From: Eddie James eajames@linux.ibm.com
stable inclusion from stable-5.10.50 commit af3d7f9e266bb03b103b197f3909c213bcb81362 bugzilla: 174522 https://gitee.com/openeuler/kernel/issues/I4DNFY
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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[ Upstream commit a5c317dac5567206ca7b6bc9d008dd6890c8bced ]
The error bits in the FSI2PIB status are only cleared by a reset. So the driver needs to perform a reset after seeing any of the FSI2PIB errors, otherwise subsequent operations will also look like failures.
Fixes: 6b293258cded ("fsi: scom: Major overhaul") Signed-off-by: Eddie James eajames@linux.ibm.com Reviewed-by: Joel Stanley joel@jms.id.au Link: https://lore.kernel.org/r/20210329151344.14246-1-eajames@linux.ibm.com Signed-off-by: Joel Stanley joel@jms.id.au Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Chen Jun chenjun102@huawei.com Acked-by: Weilong Chen chenweilong@huawei.com Signed-off-by: Chen Jun chenjun102@huawei.com --- drivers/fsi/fsi-scom.c | 16 +++++++++------- 1 file changed, 9 insertions(+), 7 deletions(-)
diff --git a/drivers/fsi/fsi-scom.c b/drivers/fsi/fsi-scom.c index b45bfab7b7f5..75d1389e2626 100644 --- a/drivers/fsi/fsi-scom.c +++ b/drivers/fsi/fsi-scom.c @@ -38,9 +38,10 @@ #define SCOM_STATUS_PIB_RESP_MASK 0x00007000 #define SCOM_STATUS_PIB_RESP_SHIFT 12
-#define SCOM_STATUS_ANY_ERR (SCOM_STATUS_PROTECTION | \ - SCOM_STATUS_PARITY | \ - SCOM_STATUS_PIB_ABORT | \ +#define SCOM_STATUS_FSI2PIB_ERROR (SCOM_STATUS_PROTECTION | \ + SCOM_STATUS_PARITY | \ + SCOM_STATUS_PIB_ABORT) +#define SCOM_STATUS_ANY_ERR (SCOM_STATUS_FSI2PIB_ERROR | \ SCOM_STATUS_PIB_RESP_MASK) /* SCOM address encodings */ #define XSCOM_ADDR_IND_FLAG BIT_ULL(63) @@ -240,13 +241,14 @@ static int handle_fsi2pib_status(struct scom_device *scom, uint32_t status) { uint32_t dummy = -1;
- if (status & SCOM_STATUS_PROTECTION) - return -EPERM; - if (status & SCOM_STATUS_PARITY) { + if (status & SCOM_STATUS_FSI2PIB_ERROR) fsi_device_write(scom->fsi_dev, SCOM_FSI2PIB_RESET_REG, &dummy, sizeof(uint32_t)); + + if (status & SCOM_STATUS_PROTECTION) + return -EPERM; + if (status & SCOM_STATUS_PARITY) return -EIO; - } /* Return -EBUSY on PIB abort to force a retry */ if (status & SCOM_STATUS_PIB_ABORT) return -EBUSY;