Re: [PATCH 1/7] scsi: hisi_sas: workaround v2 hw SATA IO timeout issue

2017-01-19 Thread Johannes Thumshirn
On Thu, Jan 19, 2017 at 12:32:47AM +0800, John Garry wrote: > From: Xiang Chen > > The v2 SAS controller needs more time to detect channel idle > and send setup link request than SATA disk does, so it is > difficult for SAS controller to setup an STP link. Therefore it

Re: [PATCH 1/7] scsi: hisi_sas: workaround v2 hw SATA IO timeout issue

2017-01-19 Thread Johannes Thumshirn
On Thu, Jan 19, 2017 at 12:32:47AM +0800, John Garry wrote: > From: Xiang Chen > > The v2 SAS controller needs more time to detect channel idle > and send setup link request than SATA disk does, so it is > difficult for SAS controller to setup an STP link. Therefore it > may cause some IO

[PATCH 1/7] scsi: hisi_sas: workaround v2 hw SATA IO timeout issue

2017-01-18 Thread John Garry
From: Xiang Chen The v2 SAS controller needs more time to detect channel idle and send setup link request than SATA disk does, so it is difficult for SAS controller to setup an STP link. Therefore it may cause some IO timeouts. We need to periodically configure the

[PATCH 1/7] scsi: hisi_sas: workaround v2 hw SATA IO timeout issue

2017-01-18 Thread John Garry
From: Xiang Chen The v2 SAS controller needs more time to detect channel idle and send setup link request than SATA disk does, so it is difficult for SAS controller to setup an STP link. Therefore it may cause some IO timeouts. We need to periodically configure the SAS controller so it doesn't