| Message ID | 20240123192854.1724905-4-echanude@redhat.com |
|---|---|
| State | New |
| Headers | show |
| Series | [v2] scsi: ufs: qcom: avoid re-init quirk when gears match | expand |
On Tue, 23 Jan 2024 14:28:57 -0500, Eric Chanudet wrote: > On sa8775p-ride, probing the hba will go through the > UFSHCD_QUIRK_REINIT_AFTER_MAX_GEAR_SWITCH path although the power info > are same during the second init. > > The REINIT quirk only applies starting with controller v4. For these, > ufs_qcom_get_hs_gear() reads the highest supported gear when setting the > host_params. After the negotiation, if the host and device are on the > same gear, it is the highest gear supported between the two. Skip REINIT > to save some time. > > [...] Applied to 6.9/scsi-queue, thanks! [1/1] scsi: ufs: qcom: avoid re-init quirk when gears match https://git.kernel.org/mkp/scsi/c/10a39667a117
diff --git a/drivers/ufs/host/ufs-qcom.c b/drivers/ufs/host/ufs-qcom.c index 39eef470f8fa..f7dba7236c6e 100644 --- a/drivers/ufs/host/ufs-qcom.c +++ b/drivers/ufs/host/ufs-qcom.c @@ -738,8 +738,17 @@ static int ufs_qcom_pwr_change_notify(struct ufs_hba *hba, * the second init can program the optimal PHY settings. This allows one to start * the first init with either the minimum or the maximum support gear. */ - if (hba->ufshcd_state == UFSHCD_STATE_RESET) - host->phy_gear = dev_req_params->gear_tx; + if (hba->ufshcd_state == UFSHCD_STATE_RESET) { + /* + * Skip REINIT if the negotiated gear matches with the + * initial phy_gear. Otherwise, update the phy_gear to + * program the optimal gear setting during REINIT. + */ + if (host->phy_gear == dev_req_params->gear_tx) + hba->quirks &= ~UFSHCD_QUIRK_REINIT_AFTER_MAX_GEAR_SWITCH; + else + host->phy_gear = dev_req_params->gear_tx; + } /* enable the device ref clock before changing to HS mode */ if (!ufshcd_is_hs_mode(&hba->pwr_info) &&
On sa8775p-ride, probing the hba will go through the UFSHCD_QUIRK_REINIT_AFTER_MAX_GEAR_SWITCH path although the power info are same during the second init. The REINIT quirk only applies starting with controller v4. For these, ufs_qcom_get_hs_gear() reads the highest supported gear when setting the host_params. After the negotiation, if the host and device are on the same gear, it is the highest gear supported between the two. Skip REINIT to save some time. Signed-off-by: Eric Chanudet <echanude@redhat.com> --- v1 -> v2: * drop test against host->hw_ver.major >= 4 and amend description as a result (Andrew/Mani) * add comment, test device gear against host->phy_gear and reset host->phy_gear only if necessary (Mani) * Link to v1: https://lore.kernel.org/linux-arm-msm/20240119185537.3091366-11-echanude@redhat.com/ trace_event=ufs:ufshcd_init reports the time spent in ufshcd_probe_hba where the re-init quirk is performed: Currently: 0.355879: ufshcd_init: 1d84000.ufs: took 103377 usecs, dev_state: UFS_ACTIVE_PWR_MODE, link_state: UIC_LINK_ACTIVE_STATE, err 0 With this patch: 0.297676: ufshcd_init: 1d84000.ufs: took 43553 usecs, dev_state: UFS_ACTIVE_PWR_MODE, link_state: UIC_LINK_ACTIVE_STATE, err 0 drivers/ufs/host/ufs-qcom.c | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-)