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| author | Yaniv Gardi <ygardi@codeaurora.org> | 2015-05-17 15:54:59 (GMT) |
|---|---|---|
| committer | James Bottomley <JBottomley@Odin.com> | 2015-06-02 20:14:39 (GMT) |
| commit | 7ca38cf300eb7fba9010d847baa6a4f5c458dd4e (patch) | |
| tree | 9a0202197e763a3cfac3acaf100c602b94de9fe0 /drivers/scsi/ufs/ufshcd.c | |
| parent | 81c7e06a5ffcca8ac8bbaa2422051bf1d7a87a46 (diff) | |
| download | linux-7ca38cf300eb7fba9010d847baa6a4f5c458dd4e.tar.xz | |
scsi: ufs: provide a quirk to disable the LCC
LCC (Line Control Command) are being used for communication between
UFS host and UFS device.
New commercial UFS devices don't have the issues with LCC processing
but UFS host controller might still have the issue with LCC processing,
hence, added a routine to disable TX LCC on the device.
Signed-off-by: Yaniv Gardi <ygardi@codeaurora.org>
Reviewed-by: Akinobu Mita <akinobu.mita@gmail.com>
Signed-off-by: James Bottomley <JBottomley@Odin.com>
Diffstat (limited to 'drivers/scsi/ufs/ufshcd.c')
| -rw-r--r-- | drivers/scsi/ufs/ufshcd.c | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index 9641bcb..3e57cca 100644 --- a/drivers/scsi/ufs/ufshcd.c +++ b/drivers/scsi/ufs/ufshcd.c @@ -2640,6 +2640,42 @@ static int ufshcd_hba_enable(struct ufs_hba *hba) return 0; } +static int ufshcd_disable_tx_lcc(struct ufs_hba *hba, bool peer) +{ + int tx_lanes, i, err = 0; + + if (!peer) + ufshcd_dme_get(hba, UIC_ARG_MIB(PA_CONNECTEDTXDATALANES), + &tx_lanes); + else + ufshcd_dme_peer_get(hba, UIC_ARG_MIB(PA_CONNECTEDTXDATALANES), + &tx_lanes); + for (i = 0; i < tx_lanes; i++) { + if (!peer) + err = ufshcd_dme_set(hba, + UIC_ARG_MIB_SEL(TX_LCC_ENABLE, + UIC_ARG_MPHY_TX_GEN_SEL_INDEX(i)), + 0); + else + err = ufshcd_dme_peer_set(hba, + UIC_ARG_MIB_SEL(TX_LCC_ENABLE, + UIC_ARG_MPHY_TX_GEN_SEL_INDEX(i)), + 0); + if (err) { + dev_err(hba->dev, "%s: TX LCC Disable failed, peer = %d, lane = %d, err = %d", + __func__, peer, i, err); + break; + } + } + + return err; +} + +static inline int ufshcd_disable_device_tx_lcc(struct ufs_hba *hba) +{ + return ufshcd_disable_tx_lcc(hba, true); +} + /** * ufshcd_link_startup - Initialize unipro link startup * @hba: per adapter instance @@ -2677,6 +2713,12 @@ static int ufshcd_link_startup(struct ufs_hba *hba) /* failed to get the link up... retire */ goto out; + if (hba->quirks & UFSHCD_QUIRK_BROKEN_LCC) { + ret = ufshcd_disable_device_tx_lcc(hba); + if (ret) + goto out; + } + /* Include any host controller configuration via UIC commands */ if (hba->vops && hba->vops->link_startup_notify) { ret = hba->vops->link_startup_notify(hba, POST_CHANGE); |