| Message ID | 75e5ea5901004ef95b37aed719686214910f6541.1525343531.git.asutoshd@codeaurora.org (mailing list archive) |
|---|---|
| State | Rejected |
| Headers | show |
On 2018-05-03 04:07, Asutosh Das wrote: > From: Yaniv Gardi <ygardi@codeaurora.org> > > Due to M-PHY issues, moving from HS to any other mode or gear or > even Hibern8 may cause some un-predicted behavior > of the device. > This patch adds provides a quirk to address that. > > Signed-off-by: Yaniv Gardi <ygardi@codeaurora.org> > Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org> > Signed-off-by: Can Guo <cang@codeaurora.org> > Signed-off-by: Asutosh Das <asutoshd@codeaurora.org> > --- > drivers/scsi/ufs/ufshcd.c | 8 +++++++- > drivers/scsi/ufs/ufshcd.h | 7 +++++++ > 2 files changed, 14 insertions(+), 1 deletion(-) > > diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c > index 5bc9dc1..f3083fe 100644 > --- a/drivers/scsi/ufs/ufshcd.c > +++ b/drivers/scsi/ufs/ufshcd.c > @@ -4162,9 +4162,15 @@ static int ufshcd_link_startup(struct ufs_hba > *hba) > goto out; > } while (ret && retries--); > > - if (ret) > + if (ret) { > /* failed to get the link up... retire */ > goto out; > + } > + > + if (hba->quirks & UFSHCD_QUIRK_BROKEN_PWR_MODE_CHANGE) { > + ufshcd_dme_set(hba, UIC_ARG_MIB(TX_LCC_ENABLE), 0); > + ufshcd_dme_set(hba, UIC_ARG_MIB(TX_LCC_ENABLE), 1); > + } > > if (link_startup_again) { > link_startup_again = false; > diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h > index cbe46f6..bb4ecfb 100644 > --- a/drivers/scsi/ufs/ufshcd.h > +++ b/drivers/scsi/ufs/ufshcd.h > @@ -591,6 +591,13 @@ struct ufs_hba { > */ > #define UFSHCD_QUIRK_PRDT_BYTE_GRAN UFS_BIT(7) > > + /* > + * Needs to be enabled if moving from HS to any other gear/mode or > even > + * hibern8 causes unpredicted behavior of device. > + * If this quirk is enabled, standard UFS driver will disable/enable > + * TX_LCC. > + */ > + #define UFSHCD_QUIRK_BROKEN_PWR_MODE_CHANGE UFS_BIT(8) > unsigned int quirks; /* Deviations from standard UFSHCI spec. */ > > /* Device deviations from standard UFS device spec. */ This was probably needed in early generation of UFS devices (non commercial) and may not be really needed now. I believe we can skip this patch.
diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index 5bc9dc1..f3083fe 100644 --- a/drivers/scsi/ufs/ufshcd.c +++ b/drivers/scsi/ufs/ufshcd.c @@ -4162,9 +4162,15 @@ static int ufshcd_link_startup(struct ufs_hba *hba) goto out; } while (ret && retries--); - if (ret) + if (ret) { /* failed to get the link up... retire */ goto out; + } + + if (hba->quirks & UFSHCD_QUIRK_BROKEN_PWR_MODE_CHANGE) { + ufshcd_dme_set(hba, UIC_ARG_MIB(TX_LCC_ENABLE), 0); + ufshcd_dme_set(hba, UIC_ARG_MIB(TX_LCC_ENABLE), 1); + } if (link_startup_again) { link_startup_again = false; diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h index cbe46f6..bb4ecfb 100644 --- a/drivers/scsi/ufs/ufshcd.h +++ b/drivers/scsi/ufs/ufshcd.h @@ -591,6 +591,13 @@ struct ufs_hba { */ #define UFSHCD_QUIRK_PRDT_BYTE_GRAN UFS_BIT(7) + /* + * Needs to be enabled if moving from HS to any other gear/mode or even + * hibern8 causes unpredicted behavior of device. + * If this quirk is enabled, standard UFS driver will disable/enable + * TX_LCC. + */ + #define UFSHCD_QUIRK_BROKEN_PWR_MODE_CHANGE UFS_BIT(8) unsigned int quirks; /* Deviations from standard UFSHCI spec. */ /* Device deviations from standard UFS device spec. */