On Tue, Jan 23, 2024 at 02:28:57PM -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. > > Signed-off-by: Eric Chanudet <echanude@xxxxxxxxxx> Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxx> - Mani > --- > > 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@xxxxxxxxxx/ > > 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(-) > > 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) && > -- > 2.43.0 > -- மணிவண்ணன் சதாசிவம்
