| Message ID | 0aa7ff1ff67e0c01d6347b932cfe7ce801ef09fc.1525343531.git.asutoshd@codeaurora.org (mailing list archive) |
|---|---|
| State | Superseded, archived |
| Delegated to: | Andy Gross |
| Headers | show |
On 2018-05-03 04:07, Asutosh Das wrote: > LCC (Line Control Command) is being used for communication between > UFS host and UFS device. But some hosts might have the issue with > issuing the LCC commands to UFS device and in this case LCC could be > explicitly disabled. > > But there could be a need where we don't want to disable the LCC > on both host & device; hence this change splits the quirk in 2 parts > one for host and one for device. > > Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org> > Signed-off-by: Venkat Gopalakrishnan <venkatg@codeaurora.org> > Signed-off-by: Can Guo <cang@codeaurora.org> > Signed-off-by: Asutosh Das <asutoshd@codeaurora.org> > --- > drivers/scsi/ufs/ufshcd.c | 16 ++++++++++++++++ > drivers/scsi/ufs/ufshcd.h | 12 ++++++++++++ > 2 files changed, 28 insertions(+) > > diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c > index f3083fe..6dabce8 100644 > --- a/drivers/scsi/ufs/ufshcd.c > +++ b/drivers/scsi/ufs/ufshcd.c > @@ -4116,6 +4116,11 @@ static int ufshcd_disable_tx_lcc(struct ufs_hba > *hba, bool peer) > return err; > } > > +static inline int ufshcd_disable_host_tx_lcc(struct ufs_hba *hba) > +{ > + return ufshcd_disable_tx_lcc(hba, false); > +} > + > static inline int ufshcd_disable_device_tx_lcc(struct ufs_hba *hba) > { > return ufshcd_disable_tx_lcc(hba, true); > @@ -4172,6 +4177,17 @@ static int ufshcd_link_startup(struct ufs_hba > *hba) > ufshcd_dme_set(hba, UIC_ARG_MIB(TX_LCC_ENABLE), 1); > } > > + if (hba->quirks & UFSHCD_BROKEN_LCC_PROCESSING_ON_HOST) { > + ret = ufshcd_disable_device_tx_lcc(hba); > + if (ret) > + goto out; > + } > + > + if (hba->quirks & UFSHCD_BROKEN_LCC_PROCESSING_ON_DEVICE) { > + ret = ufshcd_disable_host_tx_lcc(hba); > + if (ret) > + goto out; > + } > if (link_startup_again) { > link_startup_again = false; > retries = DME_LINKSTARTUP_RETRIES; > diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h > index bb4ecfb..0417c42 100644 > --- a/drivers/scsi/ufs/ufshcd.h > +++ b/drivers/scsi/ufs/ufshcd.h > @@ -598,6 +598,18 @@ struct ufs_hba { > * TX_LCC. > */ > #define UFSHCD_QUIRK_BROKEN_PWR_MODE_CHANGE UFS_BIT(8) > + > + /* > + * If UFS device is having issue in processing LCC (Line Control > + * Command) coming from UFS host controller then enable this quirk. > + * When this quirk is enabled, host controller driver should disable > + * the LCC transmission on UFS host controller (by clearing > + * TX_LCC_ENABLE attribute of host to 0). > + */ > + #define UFSHCD_BROKEN_LCC_PROCESSING_ON_DEVICE 0x100 > + > + #define UFSHCD_BROKEN_LCC_PROCESSING_ON_HOST 0x200 > + > unsigned int quirks; /* Deviations from standard UFSHCI spec. */ > > /* Device deviations from standard UFS device spec. */ Please check if these quirks are really needed for commercial version of UFS host controllers.
diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index f3083fe..6dabce8 100644 --- a/drivers/scsi/ufs/ufshcd.c +++ b/drivers/scsi/ufs/ufshcd.c @@ -4116,6 +4116,11 @@ static int ufshcd_disable_tx_lcc(struct ufs_hba *hba, bool peer) return err; } +static inline int ufshcd_disable_host_tx_lcc(struct ufs_hba *hba) +{ + return ufshcd_disable_tx_lcc(hba, false); +} + static inline int ufshcd_disable_device_tx_lcc(struct ufs_hba *hba) { return ufshcd_disable_tx_lcc(hba, true); @@ -4172,6 +4177,17 @@ static int ufshcd_link_startup(struct ufs_hba *hba) ufshcd_dme_set(hba, UIC_ARG_MIB(TX_LCC_ENABLE), 1); } + if (hba->quirks & UFSHCD_BROKEN_LCC_PROCESSING_ON_HOST) { + ret = ufshcd_disable_device_tx_lcc(hba); + if (ret) + goto out; + } + + if (hba->quirks & UFSHCD_BROKEN_LCC_PROCESSING_ON_DEVICE) { + ret = ufshcd_disable_host_tx_lcc(hba); + if (ret) + goto out; + } if (link_startup_again) { link_startup_again = false; retries = DME_LINKSTARTUP_RETRIES; diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h index bb4ecfb..0417c42 100644 --- a/drivers/scsi/ufs/ufshcd.h +++ b/drivers/scsi/ufs/ufshcd.h @@ -598,6 +598,18 @@ struct ufs_hba { * TX_LCC. */ #define UFSHCD_QUIRK_BROKEN_PWR_MODE_CHANGE UFS_BIT(8) + + /* + * If UFS device is having issue in processing LCC (Line Control + * Command) coming from UFS host controller then enable this quirk. + * When this quirk is enabled, host controller driver should disable + * the LCC transmission on UFS host controller (by clearing + * TX_LCC_ENABLE attribute of host to 0). + */ + #define UFSHCD_BROKEN_LCC_PROCESSING_ON_DEVICE 0x100 + + #define UFSHCD_BROKEN_LCC_PROCESSING_ON_HOST 0x200 + unsigned int quirks; /* Deviations from standard UFSHCI spec. */ /* Device deviations from standard UFS device spec. */