Re: [PATCH] scsi: ufs: qcom: avoid re-init quirk when gears match

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Fri, Jan 19, 2024 at 01:55:47PM -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.
> 
> If the host is at least v4, ufs_qcom_get_hs_gear() picked 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 the re-init to save some time.
> 
> Signed-off-by: Eric Chanudet <echanude@xxxxxxxxxx>
> ---
> 
> "trace_event=ufs:ufshcd_init" reports the time spent where the re-init
> quirk is performed. On sa8775p-ride:
> Baseline:
>   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 | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/ufs/host/ufs-qcom.c b/drivers/ufs/host/ufs-qcom.c
> index 39eef470f8fa..f9f161340e78 100644
> --- a/drivers/ufs/host/ufs-qcom.c
> +++ b/drivers/ufs/host/ufs-qcom.c
> @@ -738,8 +738,12 @@ 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)
> +		if (hba->ufshcd_state == UFSHCD_STATE_RESET) {
> +			if (host->hw_ver.major >= 0x4 &&

You can get rid of this check as I said in the reply.

> +			    host_params->hs_tx_gear == dev_req_params->gear_tx)

How about?

			/*
			 * 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;

- Mani

> +				hba->quirks &= ~UFSHCD_QUIRK_REINIT_AFTER_MAX_GEAR_SWITCH;
>  			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




[Index of Archives]     [Linux ARM Kernel]     [Linux ARM]     [Linux Omap]     [Fedora ARM]     [Linux for Sparc]     [IETF Annouce]     [Security]     [Bugtraq]     [Linux MIPS]     [ECOS]     [Asterisk Internet PBX]     [Linux API]

  Powered by Linux